Boron-doped Graphene Research Articles

Machine-learning-assisted discovery of boron-doped graphene with high work function as an anode material for Li/Na/K-ion batteries.

Work function (WF) modulation is a crucial descriptor for carbon-based electrodes in optoelectronic, catalytic, and energy storage applications. Boron-doped graphene is envisioned as a highly promising anode material for alkali metal-ion batteries (MIBs). However, due to the large structural space concerning various doping concentrations, the lack of both datasets and effective methods hinders the discovery of boron-doped graphene with a high WF that generally leads to strong adsorption. Herein, we propose a machine-learning-assisted approach to discover the target, where a Crystal Graph Convolutional Neural Network was developed to efficiently predict the WF for all possible configurations. As a result, the B5C27 structure is found to have the highest WF in the entire space containing 566 211 structures. In addition, it is revealed that the adsorption energy of alkali metals is linearly related to the WF of the substrate. Therefore, the screened B5C27 is investigated as an anode for Li/Na/K-ion batteries, and it possesses a higher theoretical specific capacity of 2262/2546/1131 mA h g-1 for Li/Na/K-ion batteries compared with that of pristine graphene and other boron-doped graphene. Our work provides an effective way to locate possible high-WF structures in heteroatom-doped systems, which may accelerate future screening of promising adsorbents for alkali metals.

Evidence of ferromagnetism in boron doped graphene oxide synthesized by hydrothermal method

[Enhancing graphene's ferromagnetic properties is important for a variety of applications, including spintronics, magnetic memory, and other electromagnetic devices. A modified version of Hummer's approach was used to synthesize reduced graphene oxide. Boron-doped graphene oxide with different dopant concentrations (1,3,5 and 7 wt%) has been synthesised using the hydrothermal method. Powder X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy are used to characterize the structure. The results of the XRD analysis show that reduced graphene oxide and boron-doped graphene oxide have been formed. The existence of boron atoms at the carbon lattice has been confirmed by observation of the FTIR and Raman spectra. The presence of dopant concentrations was calculated using X-ray photo electron spectroscopy. To further analyze the magnetic characteristics of doped samples, vibrating sample magnetometer investigations are used. The samples shows significant ferromagnetism at room temperature. It has been found that the saturation magnetization(Ms) increases with an increase in boron content. For the sample with the highest boron content, the saturation magnetization(Ms) reaches 0.03 emu/g at room temperature and the coercive force(Hc) reaches 73.9 Oe. Due to the improvement in the ferromagnetic property of boron doped graphene, these materials can be used for nonmagnetic applications and other electromagnetic devices.]

Thermodynamic mechanism of controllable growth of two-dimensional uniformly ordered boron-doped graphene.

Two-dimensional (2D) boron-doped graphene (B-G) exhibits remarkable properties for advanced applications in electronics, sensing and catalysis. However, the synthesis of large-area uniformly ordered 2D B-G remains a grand challenge due to the low doping level and uncontrolled distribution of dopants or even the phase separation from the competitive growth of boron polymorphs and graphene. Here, we theoretically explored the mechanism of the epitaxial growth of 2D uniformly ordered B-G on a metal substrate via ab initio calculations. We show that, by establishing the substrate-mediated thermodynamic phase diagrams, the controllable growth of 2D ordered B-G with different B/C stoichiometry can be achieved on appropriate substrates within distinct chemical potential windows of the feedstock by beating the competitive growth of graphene and other impurity phases. It is suggested that a suitable substrate for the controllable epitaxial growth of 2D ordered B-G can be efficiently screened based on the symmetry match and interaction between 2D B-G and the surfaces. Importantly, by carefully considering the chemical potential of boron/carbon as a function of temperature and partial pressure of the feedstock with the aid of the standard thermochemical tables, the optimal experimental parameters for the controllable growth of 2D ordered B-G are also suggested accordingly. This work provides a comprehensive and insightful understanding of the mechanism of controllable growth of 2D B-G, which will guide future experimental design.

Adsorption of singlet and triplet oxygen on B-doped graphene: adsorption and electronic characteristics.

The density functional calculations of electronic and structural properties of the adsorption of dioxygen on boron-doped graphene surfaces are conducted using spin-polarized density functional theory methods, including van der Waals correction. The results show significant differences in the adsorption characteristics of singlet and triplet oxygen on boron-doped graphene surfaces. Both triplet and singlet show only weak attraction to intrinsic and singly doped graphene. The singlet oxygen adsorption on doped graphene shows fascinating features involving chemisorption with dioxetane ring formation with appreciable charge transfer. In contrast, the triplet oxygen is only weakly physisorbed on the boron-doped surfaces. Chemisorption of singlet oxygen occurs with noticeable charge transfer and leads to almost featureless band structures, while the triplet oxygen physisorption proceeds with a well-defined band structure. Chemisorption of the singlet oxygen is attributed to the enormous mixing of π* of dioxygen and the p-orbitals of dopant and carbon. Because of the difference in adsorption characteristics, chemically modified graphene can find use in detecting and trapping singlet oxygen, which has potential applications in photodynamic therapy.

Boron-Doped Graphene Quantum Dots (BGQDs) from Spent Coffee Ground for Glucose Sensor

We have prepared graphene quantum dots (GQDs) and boron-doped GQDs (BGQDs) utilizing spent coffee grounds (SCGs) via a simple one-step hydrothermal process for glucose sensor application. FTIR and XPS characterizations reveal that the boron atoms have been successfully doped into graphene structures. BGQDs on glassy carbon electrode (GCE) in PBS were found to be two times as active compared to GCE/GQDs electrodes. The significant difference in electrochemical activity shown by BGQDs is evidence that boron from boric acid was doped into the graphene dominion. The generation of boronic acid groups on the boron-doped graphene quantum dots (BGQDs) surfaces facilitates the application of GQDs as a new photoluminescence (PL) probe for label-free glucose sensing. The photoluminescence of developed GQDs showed a linear response to glucose over a concentration range of 5–45 mM with a limit of detection of 12.45 mM whereas BGQDs biosensor was found to exhibit a higher sensitivity over the same concentration range with limit of detection of 3.23 mM towards glucose sensing. These results demonstrate that the synthesized BGQD has a promising potential in electrochemical activity and efficient to the PL enhancement mechanism determination of glucose.

Platinum nanoparticle-graphene quantum dot nanocage as a promising Schottky heterojunction electrocatalyst for electrochemical detection of vanillin in baby milk powder

Facile synthesis of platinum nanocrystal and its improvement in catalytic activity still face great challenges. The paper reports one strategy for synthesis of platinum nanoparticle-serine-functionalized and boron-doped graphene quantum dot composite (Pt-Ser-B-GQD). The Ser-B-GQD was prepared by pyrolysis of serine, boric acid and citric acid at 180 °C for 3 h and then reacted with chloroplatinic acid to form platiunm nanocrystal. The resultant Pt-Ser-B-GQD offers a nanocage-like structure composing of tiny graphene sheets connecting many ultrasmall platinum nanocrystals with an average particle size of 8.2 ± 0.32 nm. The combination of Pt nanocrystal with Ser-B-GQD results in the formation of Schottky heterojunction at the interface. The unique structure achieves to an improved catalytic activity. Pt-Ser-B-GQD was further used as Schottky heterojunction electrocatalyst for the construction of electrochemical sensor for the detection of vanillin. Because of excellent electrochemical properties, the sensor based on Pt-Ser-B-GQD exhibits a high sensitivity for electrochemical detection of vanillin. Differential pulse voltammetric peak current will increase linearly with increasing vanillin concentration in the range of 1 × 10−9-1 × 10−4 M with the detection limit of 2.8 × 10−10 Μ (S/N = 3). The proposed analytical method provides advantage of sensitivity, selectivity and reproducibility and was successfully applied in the detection of vanillin in baby milk powder.

Two-channel electrochemical immunosensor based on one-step-synthesized AuPt-boron-doped graphene electrode for CA153 detection

Herein, a novel dual-channel electrochemical immunosensor was fabricated via vertical growth of AuPt-decorated boron-doped graphene (AuPt-BG) nanosheets as a signal amplification platform to detect cancer antigen 153 (CA153). Highly open, porous AuPt-BG films were synthesized using one-step electron-assisted hot-filament chemical vapor deposition. The Au–Pt alloy nanoparticles were dispersed on BG nanosheets to improve their biocompatibility, and antibodies (Ab) were directly bonded to the AuPt-BG electrode. The architectures enlarged the loading of CA153Ab and efficiently catalyzed the Fe(CN)63–/4– reaction, ultimately amplifying the signals. This novel strategy allows the simultaneous detection of CA153 in the oxidation and reduction channels, improving the reliability of the detection results. The AuPt-BG-based immunosensor exhibited a lower detection limit (0.0012 mU mL−1, S/N = 3) and wider linear range (0.1–4 × 104 mU mL−1) along with improved reproducibility, selectivity, and stability for the assay of CA153. Owing to the high process controllability of AuPt-BG films, a large-area electrode for in-vitro analyses and a flexible microelectrode for in-vivo analyses were prepared, which confirmed that the AuPt-BG-based sensor is an ideal CA153 detection platform for clinical diagnosis and practical applications.

Catalytic ozonation of atrazine with stable boron-doped graphene nanoparticles derived from waste polyvinyl alcohol film: Performance and mechanism

To prepare a high-performance catalyst for heterogeneous catalytic ozonation (HCO) of atrazine (ATZ, a refractory pollutant) in water, graphene nanoparticles (GNPs) were successfully prepared by facile in situ pyrolysis method. Waste polyvinyl alcohol film was chosen as carbonaceous precursor in a “waste-to-treasure” strategy. By introducing boron (B) in the synthesis, the obtained B-doped GNPs (B-GNPs) exhibited more robust HCO performance. The ATZ degradation efficiencies by ozonation, GNPs, and B-GNPs catalytic ozonation after 10 min were 40.2 %, 69.8 %, and 83.2 %, respectively. In contrast to ozone activation in GNPs induced by oxygenated defects, boronated defects dominated ozone decomposition and subsequent reactive oxygen species generation (OH and O2–), imparting B-GNPs with greater activity and stability. Generally, B-doping promoted the electron transfer of B-GNPs, thus enhancing ozone adsorption and degradation. Also, the effect of various water matrices on ATZ degradation during HCO was comprehensively evaluated. Acute toxicity tests indicated rapid detoxification through deep ATZ degradation by B-GNP-catalyzed ozonation. This study provides a robust and efficient carbonaceous catalyst based on a “waste-treats-waste” strategy for environmental remediation, thereby providing insights into the mechanism and application of heteroatom-doped carbonaceous catalysts for the HCO process.

Exploring the impact of doping and co-doping with B and N on the properties of graphene oxide and its photocatalytic generation of hydrogen

The photocatalytic production of hydrogen was studied in graphene oxide materials doped with nitrogen or/and boron by hydrothermal treatments. Characterization of the materials was carried out by XRD, FTIR, XPS, Raman, UV–Vis, and photoluminescence spectroscopies, FESEM and TEM. The study of hydrogen evolution in the water splitting reaction was done using UV light as source of irradiation and methanol as hole scavenger. Boron-doped graphene oxide with the highest bulk electrical resistance exhibited the highest photocatalytic hydrogen generation, due to interstitial positioning of boron in the graphene lattice, which improved the light absorption coefficient, formation of inter-gap states and reduced charge recombination. This phenomenon is hypothesized for the first time as “decentralized reaction clusters”, which spread across the graphene lattice and produce hydrogen independently. Nitrogen-doped graphene oxide showed high electrical conductivity due to a significant removal of oxygen functional groups, and improved carrier density. Partially reduced nitrogen and boron co-doped graphene oxide showed the highest electrical conductivity, due to the presence of more electron-donating nitrogen configurations, such as pyrrolic N and pyridinic N. Nitrogen and boron co-doping of graphene oxide allows to modify the conduction band and valence bands, thus improving the electrical conductivity.

Fabrication of Orange Fluorescent Boron-Doped Graphene Quantum Dots for Al3+ Ion Detection.

Aluminum is a kind of metal that we often encounter. It can also be absorbed by the human body invisibly and will affect our bodies to a certain extent, e.g., by causing symptoms associated with Alzheimer’s disease. Therefore, the detection of aluminum is particularly important. The methods to detect metal ions include precipitation methods and electrochemical methods, which are cumbersome and costly. Fluorescence detection is a fast and sensitive method with a low cost and non-toxicity. Traditional fluorescent nanomaterials have a high cost, high toxicity, and cause harm to the human body. Graphene quantum dots are a new type of fluorescent nanomaterials with a low cost and non-toxicity that can compensate for the defects of traditional fluorescent nanomaterials. In this paper, c-GQDs and o-GQDs with good performance were prepared by a bottom-up hydrothermal method using o-phenylenediamine as a precursor and citric acid or boric acid as modulators. They have very good optical properties: o-GQDs exhibit orange fluorescence under UV irradiation, while c-GQDs exhibits cyan fluorescence. Then, different metal ions were used for ion detection, and it was found that Al3+ had a good quenching effect on the fluorescence of the o-GQDs. The reason for this phenomenon may be related to the strong binding of Al3+ ions to the N and O functional groups of the o-GQDs and the rapid chelation kinetics. During the chelation process, the separation of o-GQDs’ photoexcited electron hole pairs leads to their rapid electron transfer to Al3+, in turn leading to the occurrence of a fluorescence-quenching phenomenon. In addition, there was a good linear relationship between the concentration of the Al3+ ions and the fluorescence intensity, and the correlation coefficient of the linear regression equation was 0.9937. This illustrates the potential for the wide application of GQDs in sensing systems, while also demonstrating that Al3+ sensors can be used to detect Al3+ ions.

One-step superficial electrodeposition of nickel-cobalt-sulfide for high-energy hybrid asymmetric supercapacitor

A cathodic electrodeposition (ED) technique is adopted to grow multi-component nickel–cobalt-sulfide (NCS) nanosheet arrays on highly conducting nickel foam substrate. The chronoamperometry (CA) deposited electrode has shown exceptional electrochemical activity in terms of specific capacity, rate capability and excellent redox reversibility than the cyclic voltammetry (CV) deposited electrode. Having the benefit of highly conductive nanosheet arrays and three-dimensional open framework of the nanostructure, the binary metal sulfide exhibits high specific capacity of 820 C g−1 at 2 A g−1. When the NCS electrodes were combined with boron-doped graphene oxide to form an asymmetric hybrid supercapacitor, it delivered a high energy density of 83 Wh g−1 and high-power density of 9619 W kg−1.

Boron-Doped Graphene Quantum Dots Anchored to Carbon Nanotubes as Noble Metal-Free Electrocatalysts of Uric Acid for a Wearable Sweat Sensor

Boron-Doped Graphene Quantum Dots Anchored to Carbon Nanotubes as Noble Metal-Free Electrocatalysts of Uric Acid for a Wearable Sweat Sensor

DFT study on hydrogen storage of Be or V modified boron-doped porous graphene

Based on density functional theory, the hydrogen storage performance of boron-doped porous graphene modified with beryllium or vanadium metal was studied. By changing the doping amount of boron and the doping sites, it was found that metals have the highest adsorption energy on B16-PG and B22-PG doped with a pair of boron atoms and two pairs, respectively. Be2–B16-PG and Be2–B22-PG can adsorb six hydrogen molecules, the corresponding hydrogen storage capacities are 7.30 wt% and 7.40 wt%, respectively. V2–B16-PG can adsorb up to ten hydrogen molecules, with the hydrogen storage energy reaching 8.07 wt%. This shows that boron doping can effectively improve the hydrogen storage performance of the system.

Theoretical analysis of the NH3, NO, and NO2 adsorption on boron-nitrogen and boron-phosphorous co-doped monolayer graphene - A comparative study

In this work, a density functional theory (DFT) based detailed theoretical study has been performed on the Boron/Nitrogen (B/N) and Boron/Phosphorous (B/P) codoped monolayer Graphene for molecular adsorptions and co-adsorptions of three Nitrogen-based environmental pollutant gasses, namely Ammonia (NH3), Nitrogen Di-Oxide (NO2) and Nitric Oxide (NO). The B acts as a localized electron deficit site in the codoped lattice and subsequently offers a suitable adsorption site for electron-enriched gas molecules like NH3 and NOx. The work systematically explores the influence of introducing Nitrogen or Phosphorus impurities in the same and different sub-lattice sites of boron-doped Graphene in the context of molecular adsorption. In this context, six doping configurations are identified that demonstrate distinct electronic properties and characteristic responses towards individual gas molecule adsorption. The molecular adsorption strongly influences the spatial distribution of electronic states near the band edges due to orbital overlaps from the adsorbed gas molecules, which leads to significant modulations in the energy band gaps and effective masses of the codoped lattices. The co-doping strategies appear highly advantageous for electrochemical gas sensing as it leads to appreciable semiconducting bandgap opening while retaining the intrinsic nature of the Graphene. The subsequent molecular adsorptions and co-adsorptions result in notable charge transfer between the gas molecules and the host lattice and considerably enhance the density of electronic states around the Fermi-level for codoped lattices.

Effective oxygenated boron groups of boron-doped photoreduced graphene oxide for photocatalytic removal of volatile organic compounds

The adverse health effects from indoor air pollutants such as volatile organic compounds (VOCs) has intrigued much attention. Photocatalytic oxidation (PCO) is a promising technique to degrade VOCs under ambient conditions. A metal-free photocatalyst, namely boron-doped photoreduced graphene oxide (BPRGO) was synthesized via a facile, scalable, and cost-effective UV irradiation method. The BPRGO photocatalyst managed to remove 80% of the VOCs (100 mg/m3 of methanol) within 6 h (0.283 h−1) under UV-A irradiation. Moreover, up to 91% of the VOCs were successfully mineralised into harmless CO2. The high photoactivity of BPRGO-1.0 was due to the high amount of oxygenated boron groups (OBGs) namely BC2O and BCO2 groups. The suitable amount of B dopants led to a higher hole carrier density and p-type conductivity. This had retarded the charge carrier recombination which improved the photocatalytic removal of VOCs. This work provides new insights of metal-free BPRGO photocatalyst for VOCs removal.

Highly sensitive and selective electrochemical aptasensor with gold-aspartic acid, glycine acid-functionalized and boron-doped graphene quantum dot nanohybrid for detection of α-amanitin in blood

Poisonous mushroom may cause fatal harm to human and animal, but its rapid detection still faces a great challenge. The paper reports synthesis of gold-aspartic acid, glycine acid-functionalized and boron-doped graphene quantum dot nanohybrid (AGB-GQD@Au) for the electrochemical detection of α-amanitin. AGB-GQD was prepared by pyrolysis and then reacted with chloroauric acid to produce gold nanoparticles. AGB-GQD@Au offers 12.5 nm-sized particles and Schottky heterojunction, improving the catalytic activity. AGB-GQD@Au connected with hairpin DNA and thionine by Au–S bonds was used as redox probe for electrochemical detection of α-amanitin coupled with one target-induced DNA cycle amplification strategy. α-Amanitin specifically hybridizes with aptamer in duplex DNA to release auxiliary strand DNA. The released DNA triggers one DNA cycle process and brings one redox probe to the electrode surface. By the DNA cycle, one target brings many redox probes to the electrode surface, producing a significant signal amplification. The detection signal was further enhanced by the catalysis of AGB-GQD@Au towards redox of thionine. Differential pulse voltammetric current increases linearly with the increasing α-amanitin in the range from 4 to 4 × 105 fM with the detection limit of 1.2 fΜ (S/N = 3). The analytical method provides advantages of sensitivity, selectivity and repeatability. It has been successfully applied in electrochemical detection of α-amanitin in blood.

First-principle study of highly controllable boron-doped graphene (BC20) as a high-capacity anode for potassium-ion batteries

Designing new anode materials with high performance is vital for the development of full-cell potassium-ion batteries (KIBs). Although boron-doped graphene (BDG) anodes have been widely studied for lithium- and sodium-ion batteries, there are few works considering BDG anodes with controllable doping concentration applied for KIBS. Herein, by first-principle calculations, we propose a novel BDG with controllable doping concentration as a promising anode material for KIBs. As a result, the chemisorption ability of the proposed BDG (BC20) for K is greatly enhanced in comparison with the pristine graphene, since the B dopants introduce electron-deficiency. Besides, the diffusion energy barrier of K on the surface of BC20 is as low as 0.19 eV, indicating high-rate performance. Noticeably, the maximum K storage capacity is 854 mAh g−1 with a low open circuit voltage (OCV) of 0.29 V. Moreover, the chemical window of OCV is in a low range without large variation, which is favorable for providing a large operating voltage. The results suggest that the presented BC20 is not only a promising anode candidate for KIBs; but also opens an avenue for designing novel BDG structures with controllable doping concentration applied to energy storage.

Theoretical insight on mechanically robust graphene-nickel interfaces using chromium-substituted nickel and boron-doped graphene

As one type of versatile functional composites, graphene-embedded metal matrix, particularly for the nickel metal, has received much attention due to the mechanical enhancement effect. For the promising graphene-nickel composite (Gr-Ni), one of major challenges is the intrinsically weak interfaces that leads to undesired mechanical failure. To address this issue, some structural modifications are highly required for re-designing the interface towards mechanical robustness. In this work, cationic substitution for nickel and anionic replacement for graphene are rationally adopted to modify the Gr-Ni interface from a theoretical perspective. It is expected that these modifications could induce electronic coupling and/or chemical bonding effects. Specifically, a series of transition metal atoms, including chromium, manganese, iron, cobalt, and copper, are selected for the partial substitution of nickel matrix, and meanwhile the anionic boron is introduced into graphene framework. By systematic evaluation on the properties of the Gr-Ni interface, it is evidenced that the chromium-substituted nickel matrix delivers the strongest adsorption capability towards the boron-doped graphene. Furthermore, the atomic arrangement states and the substitution concentrations are explored for optimizing binding abilities. These theoretical calculation results shed light on the interfacial enhancement strategy by the effective modulation on the atomic composition over metal-graphene interfaces and offer useful guidelines on the experimental manipulation on mechanically reinforced metal-graphene composites.

The Facile Preparation of PBA-GO-CuO-Modified Electrochemical Biosensor Used for the Measurement of α-Amylase Inhibitors' Activity.

Element doping and nanoparticle decoration of graphene is an effective strategy to fabricate biosensor electrodes for specific biomedical signal detections. In this study, a novel nonenzymatic glucose sensor electrode was developed with copper oxide (CuO) and boron-doped graphene oxide (B-GO), which was firstly used to reveal rhubarb extraction’s inhibitive activity toward α-amylase. The 1-pyreneboronic acid (PBA)-GO-CuO nanocomposite was prepared by a hydrothermal method, and its successful boron doping was confirmed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), in which the boron doping rate is unprecedentedly up to 9.6%. The CuO load reaches ~12.5 wt.%. Further electrochemical results showed that in the enlarged cyclic voltammograms diagram, the electron-deficient boron doping sites made it easier for the electron transfer in graphene, promoting the valence transition from CuO to the electrode surface. Moreover, the sensor platform was ultrasensitive to glucose with a detection limit of 0.7 μM and high sensitivity of 906 μA mM−1 cm−2, ensuring the sensitive monitoring of enzyme activity. The inhibition rate of acarbose, a model inhibitor, is proportional to the logarithm of concentration in the range of 10−9–10−3 M with the correlation coefficient of R2 = 0.996, and an ultralow limit of detection of ~1 × 10−9 M by the developed method using the PBA-GO-CuO electrode. The inhibiting ability of Rhein-8-b-D-glucopyranoside, which is isolated from natural medicines, was also evaluated. The constructed sensor platform was proven to be sensitive and selective as well as cost-effective, facile, and reliable, making it promising as a candidate for α-amylase inhibitor screening.

Flexible aqueous asymmetric capacitor with SiC-decorated boron-doped graphene cathode and core–shell SiC@graphene anode

• Core-shell SiC@graphene (Gr) nanoparticles were synthesized as an anode material. • B-doped graphene (BGr) nanosheets embedded with SiC nanoparticles were synthesized. • SiC-BGr electrocatalyzed the NiOOH/NiO redox reaction to improve pseudocapacitance. • SiC-BGr cathode showed the maximum specific capacitance of 1803 mF cm −2 at 4 mA cm −2 . • Aqueous SiC-BGr//SiC@Gr capacitor showed high working voltage and stability. Flexible aqueous pseudocapacitors have the advantages of high specific capacitance, high safety, low cost, and fast ion diffusion. However, the development of such devices is a challenge because of the low stability of the active material and the high interface resistance of the current collector-active material. In this study, we used silicon carbide (SiC)-boron-doped graphene (BGr) nanosheets and core–shell SiC@Gr nanoparticles as the cathode and anode, respectively, and constructed a flexible aqueous asymmetric capacitor (ASC) with a 3 M NaOH/carboxymethyl cellulose hydrogel as the electrolyte. In an aqueous NaOH solution, the optimized SiC-BGr cathode showed a specific capacitance of 1384.3 mF cm −2 (461.4 F g −1 ) at the current density of 3 mA cm −2 (1 A g −1 ), and the core–shell SiC@Gr anode showed a wide potential window of −1.0–0 V. The as-assembled ASC device had a high working voltage of 1.4 V, delivered an excellent capacitance of 337.1 mF cm −2 , and retained 86% of its initial capacitance after 10 000 cycles. Furthermore, the ASC also showed high energy density (57.3 μWh cm −2 ), high power density (6536.9 μW cm −2 ), high bending stability, and applicability at a low temperature of −20 °C. Thus, the preparation of novel SiC-Gr materials can promote the development of flexible aqueous capacitors with high working voltage and good temperature adaptability for application in the field of wearable electronic devices with safety, strong environmental adaptability, and reliable performance.