Electron Conductivity Research Articles

Abnormal FreezingEffect on Electron Conductionof Ball-milled Lanthanum Trihydridefor Superionic Conductor.

A recent finding shows that lattice deformation could transform the mixedelectronic/hydride (H-)conductinglanthanum trihydride (LaH3) to a superionic H-conductor. Such a feature would enable the development of abrand-new all-solid-state hydride ion battery. It is essential to elucidate the mechanism of such a phenomenon. Here, we disclosean abnormal freezingeffecton the electronic conductivity (σe) of the ball-milledLaH3;that is, σecan be lowered by over 2orders of magnitude upon a low-temperature treatment. Low-temperature Ramanrevealsthat at low temperatures, lattice deformation has a noticeable influence on the interaction of hydrogen at octahedral(Ho) andtetrahedral (Ht)sites, which may play a crucial role in hindering electron conduction. This freezingeffectcan significantly improve the ionic transfer number of rare earth-based H-conductors and provide a new direction to the development of solid electrolytes for low-temperature all-solid-state batteries.

Nitrogen-doped carbon coated Na3V2O2(PO4)2F as a cathode for high-performance sodium-ion batteries

Na3V2O2(PO4)2F (NVOPF), a cathode known for the advantages of high voltage, exceptional energy density, and thermal stability, is seen as a promising candidate for sodium-ion battery cathodes. However, the NVOPF exhibits poor performance in sodium storage. Here, we report a NVOPF composite cathode with a nitrogen-doped carbon produced from dopamine hydrochloride at an elevated temperature. Firstly, neutron power diffraction (NPD) is employed to determine the structure of pure NVOPF at different temperatures, including oxygen coordination and the mobility of Na+. The nitrogen-doped carbon layer facilitates electron conduction, prevents NVOPF nanoparticle agglomeration, and thus promotes efficient electron and ion transfer during sodium ion insertion/extraction processes, thereby improving the stability of the material structure. These results indicate that the N doped carbon@NVOPF cathode material exhibits outstanding electrochemical performance (111mAh/g at 0.1C and 85mAh/g at 1C), while maintaining 91.06 % capacity retention after 500 cycles. The enhanced electrochemical performance attributes to efficient charge transfer kinetics offer novel perspectives, and the methodology can be effectively adapted to other cathode materials.

Hydrothermal synthesis of rGO-decorated NiMn2O4 nanoneedles for high-performance positive electrode in asymmetric supercapacitors

Pseudocapacitive electrode materials inherently have low electron conductivity, which prevents an energetic material from being fully utilised. We were able to produce effective hierarchical NiMn2O4/rGO composites, which provide an appealing solution to this issue. The composites were synthesised using a one-step hydrothermal approach. Due to the high electrical conductivity of reduced graphene oxide (rGO), the needles on plate like morphology of NiMn2O4, and the strong hold of dynamic materials to the current collector, the resulting hybrid electrodes exhibit a specific capacitance of 1628 Fg−1 at a current density of 1 Ag−1. They also demonstrate excellent rate performance and remarkable cycling stability, with a capacitance retention of 97.4 % after 10,000 cycles. In addition, the NiMn2O4/rGO//AC asymmetric supercapacitor (ASC) exhibits a peak energy density of 45Whkg−1 when operated at a power density of 3240 Wkg−1. The ASC device has an impressive ultralong cycling life, with a capacitance retention rate of 89.1 % after undergoing 10,000 charge/discharge cycles. The NiMn2O4/rGO composites provide a scalable production method and demonstrate outstanding electrochemical performance. This presents an opportunity to create innovative hybrid electrodes for enhanced supercapacitors.

Fluorine-doped carbon coating of LiFe0.5Mn0.5PO4 enabling high-rate and long-lifespan cathode for lithium-ion batteries

The limited electron and ionic conductivity, along with the sluggish kinetics caused by the Jahn-Teller effect of Mn3+, impose constraints on the electrochemical performance of LiFexMn1-xPO4. Herein, the surface of LiFe0.5Mn0.5PO4 (LFMP) is modified with a F-doped carbon using the solvothermal and calcination methods. The incorporation of F-doped carbon coating, along with the formation of interfacial F-Li, F-Fe and F-Mn bonds between the carbon layer and LFMP nanoparticles, significantly mitigates charge transfer resistance, facilitates rapid electron transfer, as well as enhances Li+ diffusion kinetics. The LFMP@C-F2 cathode prepared in this study exhibits an unexceptionable capacity retention of 90.5 % after 300 cycles at a low rate of 0.2C and a capacity retention of 78.8 % over 1000 cycles at a high rate of 1C. When incorporated into the solid battery configuration (Li/PEO-LATP CSE/LFMP@C-F2), it exhibits an initial discharge specific capacity of 148 mAh g−1 and maintains a capacity retention of 85.8 % after 60 cycles at 0.1C, thereby offering an innovative approach to enhance the performance of LFMP in terms of cycling stability and rate capacity in lithium-ion batteries, as well as to apply LFMP into solid-state lithium batteries.

Two-Dimensional Porphyrin-Based Covalent Organic Frameworks/g-C3N4 Composites as High-Performance Supercapacitor.

Covalent organic frameworks (COFs) with high porosity and redox-active properties have been advanced as electrode materials for energy storage systems, although poor electron conductivity and inaccessibility of active pore sites hinder their performance as electrode material for supercapacitor application. Thus, incorporation of a COF with various conductive materials can be an effective strategy to improve their electrochemical performances for supercapacitors. Herein, we report the synthesis of POR-COF@g-C3N4 composites by fabricating a porphyrin-based COF on g-C3N4 via in situ solvothermal conditions. A series of COF composites, known as POR-COF@g-C3N4-X, were prepared by incorporating different ratios of COF (X = 10%, 20%, 30%, and 40%) into g-C3N4 and investigated as electrode materials for supercapacitor performance. The optimized COF composite (POR-COF@g-C3N4-30) achieved a specific capacitance of 788 F g-1 at 4 A g-1, much higher compared to pristine COF. Further, the asymmetric device assembled using POR-COF@g-C3N4-30 demonstrated a high energy density of 24.4 Wh kg-1 at a power density of 1152 W kg-1 and a long-term cycling life of 74% capacity retention after 6000 cycles. Our work highlights the scope of COF-based composites as active electrode materials for highly efficient supercapacitor performance.

Green synthesized CaO decorated ternary CaO/g-C3N4/PVA nanocomposite modified glassy carbon electrode for enhanced electrochemical detection of caffeic acid

A highly selective, sensitive caffeic acid (CA) detection based on calcium oxide nanoparticles (CaO NPs) derived from extract of Moringa oleifera leaves decorated graphitic carbon nitride covalently grafted poly vinyl alcohol (CaO/g-C3N4/PVA) nanocomposite modified glassy carbon electrode (GCE) was studied. A facile sonochemical method was adapted to synthesis nanomaterials and characterized by HR-TEM (High resolution transmission electron microscopy), FT-IR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), FE-SEM (Field emission scanning electron microscopy), EDX (Energy dispersive X-ray analysis), Mapping and BET (Brunauer-Emmett-Teller) analysis, and electrochemical techniques. The nanocomposite modified GCE exhibited an excellent catalytic performance to the oxidation of CA under optimized conditions owing to better electron transfer efficiency, conductivity and high surface area of the electrode material. The present electrochemical sensor showed high selectivity towards the determination of 10 µM CA in the presence of 100-fold higher concentrations of interferents. The modified CA sensor exhibited a wide sensing linear range from 0.01 µM to 70 µM and the detection limit (LOD) was found to be 0.0024 µM (S/N = 3) in 0.1 M phosphate buffer saline (PBS) as a supporting electrolyte at pH 7.0. The fabricated CA sensor provides an excellent stability, reproducibility and selectivity for the determination of CA. The modified CA sensor was applied to real blood plasma samples and obtained good recovery (97.6-100.1%) results.

Zn-Doped Hollow Cubic MnO2 as a High-Performance Cathode Material for Zn Ion Batteries.

Manganese-based compounds have the characteristics of high theoretical capacity, low cost and stable performance, thus become a research hotspot for cathode materials of zinc-ion batteries (ZIBs). However, in the process of charging and discharging, it is accompanied by problems such as structural collapse and low conductivity, which resulted in severe capacity degration during cycles. In this paper, a kind of Zn2+ doped MnO2 hollow cube cathode material (Zn-MnO2) was prepared by self-sacrificing template method. The Zn2+ doped in MnO2 crystals can induce oxygen vacancies in the structure, thereby improving the structural stability ion diffusion coefficient and electrical conductivity of the material. After 100 cycles at 0.3 A g-1, the high specific capacity of 281.2 mA h g-1 is still maintained. Through ex-situ XPS and ex-situ XRD tests, the mechanism of charge-discharge process was discussed. The results show that the storage mechanism of Zn-MnO2 is H+ and Zn2+ insertion/removal and Mn3+/Mn2+ two-electron reaction pathway. The total state density (TDOS) and partial state density (PDOS) of Zn-MnO2 and MnO2 further demonstrated that the doping of Zn2+ enhanced the electron conductivity and is beneficial to the electron transfer during the electrochemical reaction.

Critical factors influencing electron and phonon thermal conductivity in metallic materials using first-principles calculations

Understanding the thermal transport of various metals is crucial for many energy-transfer applications. However, due to the complex transport mechanisms varying among different metals, current research on metallic thermal transport has been focusing on case studies of specific types of metallic materials. A general understanding of the transport mechanisms across a broad spectrum of metallic materials is still lacking. In this work, we perform first-principles calculations to determine the thermal conductivity of 40 representative metallic materials, within a range of 8-456 W mK-1. Our predicted values of electrical and thermal conductivity are in good agreement with available experimental results. Based on the data of separated electron and phonon thermal conductivity, we employ a statistical approach to examine nine factors derived from previous understandings and identify the critical factors determining these properties. For electrons, although a high electron density of states around the Fermi level implies more conductive electrons, we find it counterintuitively correlates with low electron thermal conductivity. This is attributed to the enlarged electron-phonon scattering channels induced by substantial electrons around the Fermi level. Regarding phonons, we demonstrate that among all the studied factors, Debye temperature plays the most significant role in determining the phonon thermal conductivity, despite the phonon-electron scattering being non-negligible in some transition metals. Correlation analysis suggests that Debye temperature has the highest positive correlation coefficient with phonon thermal conductivity, as it corresponds to a large phonon group velocity. Additionally, Young's modulus is found to be closely correlated with high phonon thermal conductivity and contribution. Our findings of simple factors that closely correlate with the electron and phonon thermal conductivity provide a general understanding of various metallic materials. They may facilitate the discovery of novel materials with extremely high or low thermal conductivity, or be used as descriptors in machine learning to accurately predict the thermal conductivity of metals in the future.

Electron conductance and many-body marker of a cavity-embedded topological one-dimensional chain

Electron conductance and many-body marker of a cavity-embedded topological one-dimensional chain

Construction of CeO2/Co(OH)2/FeS@NF nanosheet arrays for high-performance electrocatalytic oxygen evolution/urea oxidation, and overall water/urea splitting reactions

To develop non-noble electrocatalysts with high activity and stability for oxygen evolution reaction (OER)/urea oxidation reaction (UOR) is crucial to boost the efficiency of overall water/urea splitting reaction (OWS/OUS) for H2 production. Herein, we synthesized novel CeO2/Co(OH)2/FeS nanosheet arrays on nickel foam (CeO2/Co(OH)2/FeS@NF) through a simple two-step hydrothermal and following solvothermal routine. In this special structure, the ultra-thin 2D nanosheet morphology can adequately offer large contact area and thus abundant of active sites, facilitating significantly the mass transfer. Furthermore, the incorporation of FeS into CeO2/Co(OH)2 will not only modify the electron structure but also provide a number of phase interfaces, which can improve the inherent electron conductivity and promote the electron transport. More importantly, the rich oxygen vacancies (Ov) sites can vary the coordination of metal centers, modulating both the charge distribution and M−O bonding strength. As results, the CeO2/Co(OH)2/FeS@NF shows superior low overpotentials of 178 mV/1.30 V at 10 mA cm−2 to OER/UOR. The activity keeps its low value of 232 mV/1.375 V even when the current density was increased to as high as 300 mA cm−2. More importantly, the electrode of CeO2/Co(OH)2/FeS@NF//CeO2/Co(OH)2/FeS@NF just requires a low cell voltage of 1.41 V to realize OUS at a current density of 10 mA cm−2. Specifically, we also realized solar-driven H2 production. Plenty of H2 bubbles were continuously generated with a high speed of 600 L h−1 m−2 on the working electrode surface once the solar panel was placed under the natural sunlight.

High‐Performance MCNTs@MoS2(1‐x)Se2x Nanocomposites in Catalytic Hydrogen Evolution

AbstractAdvances in electrocatalysis require the development of high specific surface area materials with high electron conductivity. In this study, a series of MCNTs@MoS2(1‐x)Se2x nanocomposites has been prepared for application in catalytic hydrogen evolution. A uniform growth of MoS2(1‐x)Se2x nanoflower spheres on MCNTs has been achieved, circumventing stacking and aggregation. The introduction of the conducting material accelerated the electron transport rate in the electrode reaction. Structural characterization has confirmed that S doping increased the specific surface area of the catalyst, exposing more edge defects. As a result, the MCNTs@MoS2(1‐x)Se2x nanocomposites exhibited enhanced catalytic activity. Electrochemical tests have established that MCNTs@MoS1.5Se0.5 possessed the lowest overpotential (146 mV) at a current density of 10 mA/cm2 with the smallest Tafel slope (45.1 mV/dec).

Rational Electrode Design for Enhanced Battery Performance: Addressing SOC Heterogeneity and Achieving Energy Density

AbstractThe heterogeneity in the state of charge (SOC) across electrodes can significantly abbreviate battery lifespan, deteriorate safety metrics, and diminish capability rate. Despite being a known issue for some time, the factors contributing to this phenomenon have not been systematically summarized. Without a thorough understanding of the underlying causes, it is difficult to devise preventive strategies that can effectively enhance electrode behavior. This paper provides a comprehensive analysis of the factors inducing electrode SOC heterogeneity, identifying the unequal distribution of ions and electrons as the primary cause of the varied reaction rates across the electrode, which ultimately leads to SOC heterogeneity. Subsequently, preventive measures are outlined with a focus on electrode composition and structure. Furthermore, implications of SOC heterogeneity and the challenges associated with achieving both large power density and high energy density in electrodes are discussed. A more profound grasp of the mechanisms governing ion and electron conduction, coupled with materials that can resolve these dilemmas into win–win outcomes, is essential for the advancement of electrodes.

Origin of charges in bulk Si:HfO2 FeFET probed by nanosecond polarization measurements

FeFET technology offers the potential for fast, energy-efficient, low-cost, and high-capacity non-volatile memory and neuromorphic devices. However, charge trapping significantly affects device operation, leading to issues like read-after-write delay and limited endurance. Therefore, a detailed understanding of charge trapping, charge origin and its role in polarization switching is crucial. In this study, we uncover the spectral energy origin of polarization charges in Si:HfO2 N-FeFET by probing electron (conduction band) and hole (valence band) currents separately during polarization-voltage (P–V) measurements. We utilize a fast (∼20 ns) and modified positive-up-negative-down (PUND) technique, where bulk, source, and drain currents of the FeFET are measured separately. The nanosecond timescale of the measurement results in measurable currents in FeFETs having dimensions of a few μm. This charge separation shows that program (PRG, VGS > 0) charge originates from the conduction band, whereas erase (ERS, VGS < 0) originates from the valence band of the Si. Moreover, the polarization curve (P–V) of a cycled device (following 5000 PRG/ERS pulses) shows measurable hysteresis even though the transfer curve of the same device shows that the memory window in the threshold voltage vanishes. Therefore, the FeFET polarization state can be read without delay after write operation by the fast PUND measurement, both for pristine and cycled FeFETs.

Recent Advances in Salt‐Template Assisted Synthesis of 3D Porous Carbon Materials for Electrochemical Energy Storage

AbstractThe structure, morphology, and composition of electrode materials play a crucial role in determining the electrochemical performance of energy storage devices. Among various materials, three‐dimensional (3D) porous carbon stands out for its potential to enhance electrochemical energy storage due to its cost‐effectiveness, excellent ion and electron conductivity, abundant active sites, and customizable pore structure. The salt‐template method offers an environmentally friendly, fast, and cost‐efficient approach to synthesizing 3D porous carbon, with the added advantage of adjustable pore architecture and composition. This review provides a comprehensive overview of recent advancements in preparing 3D porous carbon and its composites using the salt‐template method, emphasizing their applications in batteries and supercapacitors. It also critically examines the existing challenges and explores potential future directions for further development in this field.

2D Graphene‐Like Carbon Coated Solid Electrolyte for Reducing Inhomogeneous Reactions of All‐Solid‐State Batteries

AbstractRecent studies have identified an imbalance between the electronic and ionic conductivities as the drivers of inhomogeneous reactions in composite cathodes, which cause the rapid degradation of all‐solid‐state battery (ASSB). To mitigate localized overcharge and utilize isolated active materials, the study proposes the coating of an argyrodite‐type Li6PS5Cl solid electrolyte (SE) with graphene‐like carbon (GLC@LPSCl), a 2D conductive material, to offer a continuous three‐dimensionally connected electron pathway within the composite cathode to facilitate ion mobility and promote homogeneous reactions. Despite reducing the content of the conducting agent, it is observed that the GLC@LPSCl cell exhibits high initial Coulombic efficiency and discharge capacity, reducing the inhomogeneous reactivity after 200 cycles compared with when ordinary conductive agents are deployed. Additionally, the presence of GLC@LPSCI surface suppresses the interfacial reaction between SE–cathode material, thus imparting the cell with excellent capacity retention (≈90%) after 200 cycles. Furthermore, the cell performance improves even after a fourfold increase in the cathode loading amount, demonstrating the criticality of a well‐developed continuous electron pathway to cell performance and highlighting the key role of ensuring a balance between the electron and ion conductivities in the development of high‐energy‐density and high‐power ASSBs.

An Efficient Cathode Catalyst for Rechargeable Zinc-air Batteries based on the Derivatives of MXene@ZIFs.

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are crucial processes at the cathode of zinc-air batteries. Developing highly efficient and durable electrocatalysts at the air cathode is significant for the practical application of rechargeable zinc-air batteries. Herein, N-doped layered MX containing Co2P/Ni2P nanoparticles is synthesized by growing CoNi-ZIF on the surface and interlayers of the two-dimensional material MXene (Ti2C3) followed by phosphating calcination. The growth of CoNi-ZIF on the surface of MXene results in the attenuation of high-temperature structural damage of MXene, which in turn leads to the formation of Co2P/Ni2P@MX with a hierarchical configuration, higher electron conductivity, and abundant active sites. The optimized Co2P/Ni2P@MX achieves a half-wave potential of 0.85 V for the ORR and an overpotential of 345 mV for the OER. In addition, DFT calculations were adopted to investigate the mechanism at the atomic and molecular levels. The liquid zinc-air battery with Co2P/Ni2P@MX as the cathode exhibits a specific capacity of 783.7 mAh g-1 and exceeds 280 h (840 cycles) cycle stability, superior to zinc-air batteries constructed by the cathode of commercial Pt/C+RuO2 and other previous works. Furthermore, a solid-state battery synthesized with Co2P/Ni2P@MX as the cathode exhibits stable cycle performance (154 h/462 cycles).

In-Situ Constructing N,S-Codoped Carbon Heterointerface for High-Rate Cathode of Sodium-Ion Batteries.

Na3V2(PO4)3 (NVP) is considered one of the promising choices for cathodes of sodium-ion batteries, but the poor conductivity resulted inferior rate performance limited the practical development of NVP cathodes. In this study, we successfully synthesized N/S dual-atom doped carbon coatings in situ through a simple one-step solid-state sintering method. The uniformly coated carbon layer can inhibit the agglomeration and growth of active materials during the sintering process, shorten the Na+ migration path, and increase the contact area with the electrolyte, thus facilitating rapid Na+ migration. Notably, the doping of N elements can alter the electron distribution of carbon coating, enhancing electron conductivity. Furthermore, the introduction of S elements in the carbon layer can induce the formation of stable C-S-C bonds in the molecular layer, expanding the interlayer spacing, which is beneficial for Na+ transport and storage. Therefore, the modified NVP@NSC composite provides a high specific capacity of 90.3 mAh g-1 at a rate of 20 C, with a capacity retention rate of 94.4% after 8000 cycles, demonstrating excellent stability at high current densities. Moreover, the full cell exhibits remarkable electrochemical performance at 5 C. This research contributes to the practical development of NVP cathodes.

Enabling High‐Rate and Long‐Cycling Zinc–Air Batteries with a ΔE = 0.56 V Bifunctional Oxygen Electrocatalyst

AbstractZn–air batteries (ZABs) are promising next‐generation energy storage devices due to their low cost, intrinsic safety, and environmental benignity. However, the sluggish kinetics of the cathodic reactions severely limits the ZAB performances in practical use, calling for high‐efficiency bifunctional oxygen reduction and evolution electrocatalysts. Herein, an ultrahigh‐active bifunctional electrocatalyst is developed with a record‐low ΔE of 0.56 V, significantly outperforming the noble‐metal‐based benchmark (Pt/C+Ir/C, ΔE = 0.77 V) and many other reported bifunctional electrocatalysts (mostly ΔE ≥ 0.60 V). The nanoscale composite of Fe‐based single‐atom sites and nanosized layered double hydroxides endows the bifunctional electrocatalyst with high conductivity and a large active surface that afford strengthened electron conduction and ion transport pathways. Furthermore, a remarkable improvement in stability is realized following the current division principle. ZABs with the bifunctional electrocatalyst deliver a high peak power density of 198 mW cm−2 and excellent cycling durability for over 6000 cycles. Moreover, ampere‐hour‐scale ZABs are constructed and cycled under 1.0 A and 1.0 Ah conditions. This work breaks the activity record for bifunctional oxygen electrocatalysis and expands the potential of ZABs for sustainable energy storage.

Effect of homogenization treatment on microstructure and properties of novel Al-Mg-Zn-Sc-Zr alloys with different Mg/Zn ratios

This study investigated the effect of homogenization treatment on microstructure and properties of Al-Mg-Zn-Sc-Zr alloys with different Mg/Zn ratios using optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), electron backscatter diffraction (EBSD), transmission electron microscope (TEM), hardness, and conductivity tests. The results show severe dendrite segregation in Al-Mg-Zn-Sc-Zr ingots produced by water-cooled copper mold casting, with the as-cast microstructure mainly composed of an α-Al matrix, non-equilibrium T-Mg32(Al,Zn)49 phase, and a small amount of coarse primary Al3(Sc, Zr) phase. As Mg/Zn ratio decreases, the volume fraction of T-phase increases from 4.92 % to 5.41 %, and the grain size increases from 15.41 μm to 20.43 μm. DSC curves show the first endothermic peak at 468–475 °C, corresponding to the melting temperature of non-equilibrium second phase, setting the homogenization temperature to 460 °C. As homogenization time increases, non-equilibrium phase gradually dissolves. When Mg/Zn ratio is 1.71, the over-burning phenomenon occurs at 24 h; With the reduction of Mg/Zn ratio to 1.33, the over-burning occurred at 16 h. Two-stage homogenization significantly increased the amount of the second phase Al3(Sc, Zr) and refined grain size. After two-stage homogenization, the hardness and conductivity of the studied alloys with Mg/Zn ratio of 1.77 and 1.31 reach maximum values of 135.53HV and 144.22HV, and the conductivity is 30.10 % IACS and 28.71 % IACS, respectively.

Composition design of fullerene-based hybrid electron transport layer for efficient and stable wide-bandgap perovskite solar cells

Fullerene derivatives [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) has been routinely used as the electron transport layer (ETL) in perovskite solar cells due to its suitable energy levels and good solution processability. However, its electron mobility and conductivity still need to be further enhanced for constructing high performance perovskite solar cells (PSCs). Herein, by doping the PC61BM with a p-type polymer PM6 and n-type molecule ITIC, efficient wide-bandgap perovskite solar cells with improved efficiency and operational/storage stability are obtained. Further spectroscopy and electric measurements indicate PM6 and ITIC can both passivate defects at the perovskite/ETL interface, meanwhile ITIC can elevate the Fermi level of PC61BM to enhance conductivity and PM6 can improve the photo-induced electron mobility of the ETL, facilitating charge extraction and reducing charge recombination. As the results, Cs0.17FA0.83Pb(I0.83Br0.17)3 wide-bandgap PSCs with PM6:PC61BM:ITIC as the ETL demonstrates a superior efficiency of 22.95%, compared to 20.89% of the PC61BM assisted device.