2D Borophene Research Articles

Tuning the Active Oxygen Species of Two-Dimensional Borophene Oxide toward Advanced Metal-Free Catalysis.

Two-dimensional (2D) borophene materials are predicted to be ideal catalytic materials due to their structural analogy to graphene. However, the lack of chemical functionalization of borophene hinders its practical application in catalysis. Herein, we reported a massive production of freestanding few-layer 2D borophene oxide (BO) sheets with tunable active oxygen species by a moderate oxidation-assisted exfoliation method. State-of-the-art characterizations demonstrated the evolution of active oxygen species from surface B-O species at the initial stage to the intermediate BxOy (1.5 < x/y < 3) species and eventually to bulk B2O3 with an increasing oxidation duration. As a result, the 2D BO sheet with enhanced B-O species exhibited a strikingly high catalytic activity for the aerobic oxidation of benzylamine into N-benzylidenebenzylamine. The formation rate of imine reaches as high as 29.7 mmol gcatal-1 h-1 under mild reaction conditions, higher than that of pristine borophene, boron oxides, graphene oxide, and other metal/metal-free catalysts in the reported literature. Density functional theory calculations further revealed the critical role of surface B-O species, which favor the adsorption and N-H activation of benzylamine for high activity and suppress the deep dehydrogenation, yielding an outstanding imine selectivity (>90%). This work paves the route for a moderate and scalable synthesis of few-layer BO sheets with highly active B-O species toward advanced metal-free catalysis beyond graphene.

Integration of 2D borophene into semiconducting N, P, S, and F-doped 1D carbon for energy storage and conversion devices

Innovative energy storage and high-performing conversion devices are urgently required to meet global energy issues. In this study, we synthesized and characterized a nitrogen, phosphorus, sulfur, and fluorine-doped one-dimensional carbon (NPSF@C) integrated with two-dimensional borophene (Bph) nanosheets, forming a nanocomposite (NPSF@C/Bph). The physicochemical and structural characterization confirmed borophene’s successful doping and integration into the NPSF@C matrix. Density Functional Theory (DFT) analysis indicated that the doping of heteroatoms and the integration of Bph increased the number of conduction bands in NPSF@C/Bph, effectively reducing the band gap of the material from 1.99 eV (MWCNT) and 1.43 eV (Bph) to 0.067 eV. This transformation was attributed to the introduction of localized states near the Fermi level and an enhanced density of states, resulting in a metal-like behavior for the NPSF@C/Bph composite. The NPSF@C/Bph composite demonstrated a specific surface area of 1962.78 m2/g and a pore volume of 1.2423 cm3/g, significantly enhancing its electrochemical performance. The composite showed a high specific capacitance of 837F/g at a current density of 1 A/g and retained 92.72 % of its initial capacitance after 10,000 cycles. It also exhibited a high energy density of 78.28 Wh/kg and a power density of 4545 W/kg in a symmetric supercapacitor device. Additionally, electrochemical tests revealed that the NPSF@C/Bph composite exhibited a lower overpotential and higher current density for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) compared to its counterparts. Specifically, the overpotential for OER is 283 eV, and HER is 73 mV at a current density of 10 mA/cm2. The Tafel slopes were 63 mV/dec for OER and 67 mV/dec for HER, indicating superior reaction kinetics.

Thermal and electronic properties of borophene in two-dimensional lateral graphene-borophene heterostructures empowered by machine-learning approach

Due to its electron-deficient character and complicated banding mechanism, two-dimensional (2D) borophene has gain more attentions recently. The polymorphism of 2D borophene provides more room for forming the 2D lateral heterostructures. However, the effects of confined circumstance on many properties of the borophene are unknown. In this work, using first-principles calculations and molecular simulations based on the machine learning interatomic potential, we investigated the electronic structures and thermal properties of 2D lateral graphene-borophene heterostructures (GBHs). We found that the graphene-borophene heterostructure promotes the thermal transport of borophene, and different concentrations of borophene hardly affect the lattice thermal conductivity of the interface. We also found the charge transfer induced thermal conductivity change in borophene domain of GBH, compared with that of bulk borophene. The present results not only advance our understanding of 2D lateral GBHs, but also provide valuable information on the heat transfer properties of 2D heterogeneous graphene-based materials in practical applications.

Screening for electrocatalytic reduction of N2 by borophene supported bimetallic atoms

Ammonia (NH3), as a high energy density chemical and hydrogen energy storage medium, has garnered significant interest in the realms of energy storage and catalysis. In contrast to the traditional Haber-Bosch process, the electrocatalysis nitrogen reduction reaction (eNRR) can synthesize green ammonia under mild reaction conditions. Based on density functional theory (DFT), the potential of 2D borophene supported transition metals as bimetallic atomic catalysts (BACs) in eNRR was investigated. Progressive screening through energy-oriented screening mechanism, Sc2B12, Ti2B12, V2B12 and Zr2B12 were identified as potential eNRR catalysts. Their complete reaction pathways and Gibbs free energy (ΔG) were further explored, and corresponding overpotentials were obtained. The results showed that overpotentials of the potential determining steps (PDS) of these catalysts were 0.34, 0.40, 0.39 and 0.13 V, respectively, demonstrating excellent eNRR catalytic activity and good selectivity. Cu2B12 shows remarkable hydrogen evolution reaction (HER) catalytic activity with an overpotential (η) of only 0.05 V. The study also revealed that the catalytic activity of TM2B12 is derived from its excellent conductivity, and the charge transmission enhances the catalyst activity of eNRR. Consequently, this study provides significant theoretical guidance and support for the synthesis of novel eNRR catalysts, and promotes further advancement in the field of catalysis.

Chiral Induction in 2D Borophene Nanoplatelets through Stereoselective Boron-Sulfur Conjugation.

Chirality is a structural metric that connects biological and abiological forms of matter. Although much progress has been made in understanding the chemistry and physics of chiral inorganic nanoparticles over the past decade, almost nothing is known about chiral two-dimensional (2D) borophene nanoplatelets and their influence on complex biological networks. Borophene's polymorphic nature, derived from the bonding configurations among boron atoms, distinguishes it from other 2D materials and allows for further customization of its material properties. In this study, we describe a synthetic methodology for producing chiral 2D borophene nanoplatelets applicable to a variety of structural polymorphs. Using this methodology, we demonstrate feasibility of top-down synthesis of chiral χ3 and β12 phases of borophene nanoplatelets via interaction with chiral amino acids. The chiral nanoplatelets were physicochemically characterized extensively by various techniques. Results indicated that the thiol presenting amino acids, i.e., cysteine, coordinates with borophene in a site-selective manner, depending on its handedness through boron-sulfur conjugation. The observation has been validated by circular dichroism, X-ray photoelectron spectroscopy, and 11B NMR studies. To understand how chiral nanoplatelets interact with biological systems, mammalian cell lines were exposed to them. Results showed that the achiral as well as the left- and right-handed biomimetic χ3 and β12 borophene nanoplatelets have distinct interaction with the cellular membrane, and their internalization pathway differs with their chirality. By engineering optical, physical, and chemical properties, these chiral 2D nanomaterials could be applied successfully to tuning complex biological events and find applications in photonics, sensing, catalysis, and biomedicine.

Promotion of borophene/NiO-based electrocatalyst for oxygen evolution reaction

Electrochemical water splitting has great potential for converting electricity into clean energy through electrode reactions. However, the anodic oxygen evolution reaction (OER) exhibits serious drawbacks such as: (i) high overpotential, slow reaction dynamics, limited robustness at high current density, and (ii) high cost of standard catalysts in OER (IrO2 or RuO2). Therefore, in our study, we address those issues and present a new composite based on 2D borophene functionalized with nickel oxide nanoparticles with highly active electrocatalytic properties in OER, with a low overpotential of 191 mV reaching j = 10 mA/cm2 and Tafel slope of 44 mV/dec. Additionally, the structure showed electrochemical and physical stability during long-term measurements, with excellent potential retention of 99.9 % at 50 mA/cm2. The electrochemical surface area (ECSA) revealed an increase in the number of active sites available for the reaction to occur, with respect to individual components of composites. Detailed spectroscopic and microscopic analyses of the electrocatalyst conducted before and after OER allowed us to propose insight into the reaction mechanism indicating the synergy between borophene and NiO nanoparticles (facilitated electron charge transfer and additional reaction intermediate such as NiB12O14(OH)10). The proposed fabrication process of borophene functionalized by NiO is facile, low-cost, and scalable. Moreover, this strategy offers an additional avenue to explore a 2D family of electrocatalysts in OER enriching the current state of the art in the field.

Strain engineering of the electrocatalytic activity of nitrogen-rich BeN4 Dirac monolayer for hydrogen evolution reaction

The strong bond energy and short bond length of N≡N triple bond make it a challenging target for synthesizing nitrogen-rich compounds. However, recent research has successfully fabricated atomic-thick BeN4 layers under high pressure (Bykov et al., 2021). Beryllonitrene, a new 2D material, consists of a Be atom and polymeric nitrogen chains and has anisotropic Dirac cones located near the Fermi level. This distinguishes it from graphene, which has isotropic Dirac cones, bulk PtTe2 and 2D borophene, which have Dirac cones located far from the Fermi energy. The anisotropic Dirac cones in beryllonitrene result in ultrahigh carrier mobility and the potential for direction-dependent quantum devices. In this study, we systematically investigated the hydrogen evolution reaction (HER) catalytic activity of nitrogen-rich, non-precious BeN4 monolayer using first-principles DFT calculations. Our results demonstrate that BeN4 monolayer is thermally stable, and Be vacancy is the most energetically favorable site for hydrogen adsorption. We also found the Gibbs free energy (ΔGH∗) of H∗ coverage can be tuned to an optimal value of |ΔGH∗|≤ 0.2 eV through strain engineering, significantly enhancing the HER electrocatalytic activity of BeN4 monolayer. Furthermore, we examined both the homolytic Tafel reaction and heterolytic Heyrovsky reaction for HER mechanism using reaction kinetics and AIMD simulations. These findings can contribute to the development of high-performance, non-precious, and nitrogen-rich 2D catalysts for HER in future research.

Low-Pressure CVD Synthesis of Tetragonal Borophene Single-Crystalline Sheets with High Ambient Stability

Being a typical graphene-like two-dimensional (2D) material, borophene has received a lot of attention due to its low density, high electron mobility, large Young’s modulus, and good chemical stability. Compared with the corresponding bulk counterparts, 2D borophene has larger specific surface area, higher conductivity, and smaller work function, finding potential applications in high-speed transistors, optoelectronic detection, field emission (FE), and mechanical enforcement areas. In this paper, 2D tetragonal borophene sheets with high ambient stability have been successfully fabricated on the surface of 1 cm2 copper foil using a developed low-pressure chemical vapor deposition (LPCVD) method. The vapor–solid mechanism was used to comprehend the formation of the tetragonal borophene sheets. The electrical conductivity of individual borophene sheets ranged from 4 to 5 × 10–4 S/cm, and the band gap was about 2.1 eV, suggesting their narrow semiconductive nature. Also, the maximum FE current of individual borophene sheets was close to 1 μA, and their emission properties enhanced with the decreasing sheet thickness, comparable to many other nanomaterials with excellent FE performances. More interestingly, individual borophene sheets were found to retain good enough electrical transport and FE behaviors even if they experienced several days’ atmospheric conservations. Our research results suggest that the LPCVD-grown borophene may be a promising building block for constructing high-performance nanodevices with good ambient stability.

Borophene-based mixed-dimensional van der waals heterojunctions for high-performance self-powered photodetector

The ongoing pursuit of mixed-dimensional van der Waals heterojunctions has attracted enormous interests owing to their obviously enhanced photoelectrochemical (PEC) characteristics compared to their single components. Herein, we demonstrate the preparation of 0D Bismuth nanoparticles (Bi NPs) coated 2D Borophene (B@Bi) mixed-dimensional heterojunction by hydrothermal method. Benefiting from the promoted photo-induced electron/hole pair separation, shorted charge transfer length, and built-in electric field, the fabricated B@Bi-based PEC-type photodetector (PD) exhibits enhanced self-powered photodetection properties along with the fast response and recovery speed (0.02/0.02 s) in 0.5 M KOH electrolyte under 365 nm illumination. Additionally, repeatable ON/OFF switch signals can be observed after 30 days. Our present work provides an opportunity for fabricating high-performance mixed-dimensional B@Bi-based PDs with good long-term stability.

Liquid crystalline 2D borophene oxide for inorganic optical devices

Borophene has been recently proposed as a next-generation two-dimensional material with promising electronic and optical properties. However, its instability has thus far limited its large-scale applications. Here, we investigate a liquid-state borophene analogue with an ordered layer structure derived from two-dimensional borophene oxide. The material structure, phase transition features and basic properties are revealed by using X-ray analysis, optical and electron microscopy, and thermal characterization. The obtained liquid crystal exhibits high thermal stability at temperatures up to 350 °C and an optical switching behaviour driven by a low voltage of 1 V.

A perfect match between borophene and aluminium in the AlB3 heterostructure with covalent Al-B bonds, multiple Dirac points and a high Fermi velocity.

By performing a swarm-intelligent global structure search combined with first-principles calculations, a stable two-dimensional (2D) AlB3 heterostructure with directed, covalent Al–B bonds forms due to a nearly perfect lattice match between 2D borophene and the Al(111) surface. The AlB3 heterosheet with the P6mm space group is composed of a planar Al(111) layer and a corrugated borophene layer, where the in-plane coordinates of Al covalently link with the corrugated B atoms. The resulting structure shows a similar interlayer interaction energy to that of the Al(111) surface layer to the bulk and high mechanical and thermal stability, possesses multiple Dirac points in the Brillouin zone with a remarkably high Fermi velocity of 1.09 × 106 m s−1, which is comparable to that of graphene. Detailed analysis of the electronic structure employing the electron localisation function and topological analysis of the electron density confirm the covalent Al–B bond with high electron localisation between the Al and B centres and with only little interatomic charge transfer. The combination of borophene with metal monolayers in 2D heterostructures opens the door to a rich chemistry with potentially unprecedented properties.

Dual-role of β borophene nanosheets as highly effective antibacterial and antifungal agent

Antimicrobial resistance toward antibiotics has been a serious clinical problem to current bacterial infections therapy. In this context, current research and development have been focused on developing new perspectives on two-dimensional (2D) materials based antimicrobial agents. With the rapid development of 2D borophene, it has been regarded as a promising agent for sensor, energy, and biomedical applications. Herein, we have reported the fabrication of the multifunctional antibacterial and antifungal agent, β-rhombohedral crystalline structured borophene nanosheets, which were prepared using a top-down synthesis approach. The antibacterial and antifungal activities of β borophene nanosheets were investigated to determine using different pathogenic microorganisms such as Staphylococcus aureus (NCTC 10788/Lot 0350520029), Pseudomonas aureginosa (ATCC 9027/Lot 3270513), Escherichia coli (ATCC 8739/Lot 4835151), Candida albicans (NCPF 3179/Lot040920020), and Aspergillus brasilliensis (NCPF 2275/Lot 020620065) using the total aerobic mesophilic microorganism (lSO 21149) and mold-yeast (lSO 16212) guidelines. According to the experimental results, we showed that the borophene nanosheets had an effectively inhibitory activity against several medically serious bacterial and fungal pathogenic microorganisms.

Super-planckian thermal radiation in borophene sheets

Recently, borophene, a pioneering two-dimensional metal, has been attracting broad interest due to the in-plane anisotropic polaritons and large electrical tunability. Its attractive electronic and optical properties imply that borophene can find novel applications in electronics, thermionics, and photonics. Here, we study the near-field thermal radiation (NFTR) of monolayer borophene sheets; the results show that the NFTR of monolayer borophene is three-orders of magnitude larger than the black-body limit, even significantly exceeding the NFTR from traditional metals and metallic oxides with metallic behavior. An analysis of the photon tunneling coefficient and plasmon dispersion indicates that the coupling of quasi-elliptic surface plasmon polaritons (SPPs) of the borophene system extends robustly to the near- and mid-infrared frequencies, producing a broadband near-field emission from borophene. We also analyze the possibility of using the electrochemical method (that is, tuning the electron density) to modulate the NFTR between borophene sheets. The results reveal since the suppression on the wave-vector range and the anisotropy of SPPs by electron density, the switching coefficient of such electrochemical method can exceed up to 95%. Finally, the modulate effect of the mechanical decoupling on the NFTR is explored. We clarify the influence of decoupling effect at different frequencies on the mechanical thermal modulation of borophene. All in all, we explore the NFTR of the 2D borophene thoroughly for the first time, opening potential possibility for novel borophene-dependent thermal devices and thermal management.

Electron–phonon coupling in lightly [formula omitted]-doped 1T monolayers of PdSTe and PdSeTe: A rigid band approximation approach

In this paper, we present a preliminary study to determine the electron–phonon (el–ph) coupling in Janus 1T monolayered PdSTe and PdSeTe within the rigid band approximation (RBA). Under the assumption that both electronic band structures and phonon dispersions remain intact, or suffer slight changes at most, the Fermi energy is manually shifted towards the conduction bands. Without spin–orbit coupling (SOC), these structures are predicted to be semiconductors with electronic bandgaps of 0.33 eV for PdSTe and 0.34 eV for PdSeTe and with an insignificant electron–phonon coupling. We find that minimal small Fermi energy shifts of the order of 35 meV and 65 meV applied to 1T PdSTe and PdSeTe respectively, are sufficient to produce non-zero values of λ in both systems. These shifts could physically correspond to small electron doping of the materials, not exceeding 4%. Our calculations give that λ=1.77 and λ=0.5 for PdSTe and PdSeTe respectively. The corresponding lowest superconducting temperatures (Tc) register 0.28 K for PdSeTe and 28.19 K for PdSTe. We also demonstrate that the longitudinal optical and acoustical phonon modes may play a key role in the process of superconductivity of the doped materials. The above temperature of PdSTe is larger than those for 2D borophene, stanene, phosophorene and arsenene indicating that, in principle if the right dopant is found, lightly n-doped PdSTe could be promising in the area of 2D superconductors.

Broadband Nonlinear Photonics in Few-Layer Borophene.

In this paper, 2D borophene is synthesized through a liquid-phase exfoliation. The morphology and structure of as-prepared borophene are systemically analyzed, and the Z-scan is used to measure the nonlinear optical properties. It is found that the saturable absorber (SA) properties of borophene make it serve as an excellent broadband optical switch, which is strongly used for mode-locking in near- and mid-infrared laser systems. Ultrastable pulses with durations as short as 792 and 693 fs are successfully delivered at the central wavelengths of 1063 and 1560nm, respectively. Furthermore, stable pulses at a wavelength of 1878nm are demonstrated from a thulium mode-locked fiber laser based on the same borophene SA. This research reveals a significant potential for borophene used in lasers helping extending the frontiers of photonic technologies.

Theoretical simulation and design of two-dimensional ferromagnetic materials

Spintronic devices, using the spins of electrons as information processing, have generated world-wide interest. Just as graphene, transition-metal dichalcogenides, and black phosphorus revolutionized condensed matter and materials engineering, the discovery of two-dimensional (2D) van der Waals (vdW) magnetic materials is expected to open a new horizon in material science and enable the potential development of spintronics. In fact, 2D magnetism has been investigated for decades while the experimental validation was unable to achieve till recently. The recent exciting 2D ferromagnetic breakthroughs, such as monolayers CrX3 (X = Cl, Br), monolayer Fe3GeTe2, and bilayer CrGeTe3 from their vdW bulk down to atomically thin, have also pushed forward researches on novel magnetic properties and creative concepts. In contrast to the traditional magnetic thin films, 2D vdW ferromagnetic materials (FM) largely decouple from the substrates, allow electrical control and are open to chemical functionalization. Without clear targets or guidelines, traditional trial-and-error experiments face the fundamental challenges of long time and high costs. Computational simulations, which serving as an important first step in exploring possible applications of new materials, can not only predict novel 2D materials but also suggest their possible synthesis routes. Many interesting cases, such as the growth of 2D borophene (B) and tellurene (Te), thermoelectricity in tin selenide (SnSe), ferroelectricity in tin telluride (SnTe), and high carrier mobilities in black phosphorene, have been confirmed by experiments, showing the accuracy of computational methods and their ability in facilitating experimental exploration in 2D space. Compared to other computational methods, the first-principles method, which has been the most widely used tools in designing new materials, only require a few basic physical constants and the atomic position coordinates. It is valuable mainly in two important aspects: (1) It can be used to predict and design new materials with novel properties, and (2) it provides understanding of the physics underlying the properties of new materials to replace the expensive and time-consuming physical test. Therefore, first-principles method based on density functional theory is effective for investigating new materials. In fact, the rapid development of 2D magnetic materials benefits from theoretical simulation. For example, the recent star ferromagnetic bilayer CrGeTe3, monolayer CrI3, and monolayer Fe3GeTe2 were also first predicted theoretically, and they have recently been experimentally made, which shows the strong power of first-principles calculations in designing these spintronics materials. In this review, we highlight the overall picture of recent progress, current challenges, and future prospects on theoretical design of FM materials. We hope this review provides basic understanding the importance of first-principles calculations in facilitating new discoveries and the accurate characterization of 2D FM materials. To achieve this, we first give the reason why ferromagnetic order exists in 2D space at finite temperature theoretically. Then, we summarize the discovery processes and magnetic properties of recent landscape of several 2D ferromagnetic semiconductors, metals, and half-metals, using 2D CrI3, CrGeTe3, Fe3GeTe2, and FeCl2 as the examples, respectively. Finally, we highlight the existing problems of designed 2D FM materials and propose possible directions in computational simulations for further development. Of course, this review cannot cover all 2D FM materials, and readers can also refer to other recent reviews and references therein for more low-dimensional FM materials.

Borophene with Large Holes.

In two-dimensional (2D) borophene, the structural transition from triangular lattice to hexagonal lattice with an increase in vacancy concentration is a basic principle of constructing various borophene isomers. Here, by performing an extensive structural search of 4239 borophene isomers with both hexagonal holes (HHs) and large holes (LHs), we show that the structural transformation from triangular lattice to borophene with large holes is energetically more favorable. Borophene isomers with LHs are more stable than those with only HHs at high vacancy concentrations (>20%) and are just slightly less stable than those with only HHs at low vacancy concentrations. This discovery greatly expands the family of 2D borophene and opens a route for synthesizing new borophene isomers.

An ab initio study of the [formula omitted] boron nanocluster for application as atmospheric gas ([formula omitted]) sensor

A new class of quasi-planar 2D borophene B35 has been investigated for gas sensing properties towards different atmospheric gases by DFT methods. The global minimum structures show the gases prefers the hexagonal hollow site available in B35 clusters. Adsorption of the gases significantly changes electrostatic potential and the HOMO–LUMO energy gap of B35. The adsorption energies, ionization potential and molecular orbital analysis revealed that NO,N2O, and NH3 gases for B35 nanocluster are adsorbed via physisorption process while NO2 is chemically adsorbed. The adsorption and electronic properties analysis suggest that the B35 cluster can be used as atmospheric gas sensor.

Two novel triangular borophenes B3H and B6O: first-principles prediction

By means of density functional theory calculations, we successfully predict two stable 2D triangular borophenes, namely B3H and B6O. Our results indicate that B3H is a Dirac material and its cone point is located at the K point of the Brillouin zone (BZ). B6O is identified as having a node-line ring and Dirac cones together. Its node-line ring formed by the intersection of the extended energy band from the two Dirac cones located on K point. This modified 2D borophene has great thermal and dynamic stability due to the electron transfer from the triangular boron lattice to the O atoms. The electronic structure of B6O nanofilm demonstrates novel properties such as two Dirac cones, more than 1.3 eV linear dispersion bands at some points of the BZ, as well as excellent transport properties for the extremely high mobility brought by the combination of the node-line semimetal and Dirac cones. Our study may motivate potential applications of 2D materials in nanoelectronics.

Electron transport properties of boron nitride chains between two-dimensional metallic borophene electrodes

Abstract Recently, boron nitride (BN) chains have been made from hexagonal BN sheets. However, the BN sheet has a large band gap, which is not suitable to be used as the electrode material of BN chain-based two-dimensional (2D) electronic devices. The successful preparation of borophene sheets opens a possible way for building BN chain-based 2D devices. The borophene is a metal material with strong oxidation resistance. In particular, recent experimental results show that the borophene exists massless Dirac fermions, which makes it a suitable candidate for constructing high-speed low-dissipation devices. Here, we investigate the electron transport properties of boron nitride chains between 2D metallic borophene electrodes by using nonequilibrium Green's functions in combination with the density functional theory. Surprisingly, the BN chain displays metallic characteristic when coupled into 2D borophene electrodes. Inherent negative differential resistance behaviors can be observed in the BN chains sandwiched between 2D metallic borophene. Meanwhile, the current superposition law is studied in BN chain-based 2D circuits. Results show that the current value of BN chain-based system with parallel paths is more than twice that with a single path, which is different from Kirchhoff's circuit laws. Moreover, the effects of strain on the electron transport properties of BN chain-based 2D electronic devices are also studied.