Coatings
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2021
·Vol. 11
·期 5
·523
·
IF 2.881
Cong Wang,Chengchen Xu
Chemical doping of boron atoms is essential to modify the electrical properties of graphene films. The synthesis of large-scale boron-doped graphene with high uniformity and good electrical properties is still a great challenge. To improve the quality and uniformity of boron-doped graphene, we introduced several methods to engineer the surface of the copper catalyst for chemical vapor deposition. The ethylic acid treatment proved to be more effective to remove surface impurities than the hydrochloric acid treatment. Moreover, electrochemical polishing showed the best performance in reducing the impurities and surface roughness in all the methods. The sheet resistance and carrier mobility of the boron-doped graphene film grown on the electropolished copper foil were 2.35 kΩ/□ and 1.15 × 103cm2·V−1·s−1at room temperature, respectively. Our results suggest that the boron-doped graphene grown on the electropolished copper catalyst possesses a high carrier mobility and less structural defects, which makes it suitable for application in optoelectronics.Keywords:boron-doped graphene;surface engineering;electrochemical polishing
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21805-21814
·
IF 7.443
Yangming Lin,Yansong Zhu,Bingsen Zhang,Yoong Ahm Kim,Morinobu Endo,Dang Sheng Su
Incorporating heteroatoms into onion-like carbon (OLC, average size ∼5 nm) with a fullerene-like structure and investigating its peculiar properties are fascinating challenges. Here, we present straightforward fabrication of doped OLC samples with a high concentration of boron (0.63–4.57 at%) via a high-temperature thermal diffusion method. The highest proportion of substitutional boron of the boron species reaches 29%, which far exceeds most of the reported boron-doped carbon materials. The influence of boron on the fullerene-like layers and electronic properties of OLC is systematically investigated using Raman spectroscopy with different excitation energies (1.58–3.8 eV) and ultraviolet photoelectron spectroscopy (UPS). The as-prepared boron-doped OLC samples exhibit a perfect four-electron process for the oxygen reduction reaction (ORR), which is similar to commercial Pt/C. It is worth noting that the intrinsic relationship between the electronic properties and catalytic performance of doped samples is explored based on experimental studies instead of theoretical calculations. The results indicate that the lower work function, lower valence band edge and higher density of states (DOSs) of doped OLC are crucial to improve the catalytic performance. Our work can provide valuable information on the design of doped metal-free materials and give new evidence for enhanced ORR activity associated with heteroatom doping and electronic properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 2
·868
·
IF 3.4
Kai Zhang,Kehao Zhang,Yuxiang Ma,Hailong Wang,Junyong Shao,Mingliang Li,Gang Shao,Bingbing Fan,Hongxia Lu,Hongliang Xu,Rui Zhang,Huanhuan Shi
TiO2/Au/BDD composites with a Z-scheme structure was prepared by orderly depositing gold (Au) and titanium dioxide (TiO2) on the surface of a boron-doped diamond (BDD) film using sputtering and electrophoretic deposition methods. It was found that the introduction of Au between TiO2and the BDD, not only could reduce their contact resistance, to increase the carrier transport efficiency, but also could improve the surface Hall mobility of the BDD electrode. Meanwhile, the designed Z-scheme structure provided a fast channel for the electrons and holes combination, to promote the effective separation of the electrons and holes produced in TiO2and the BDD under photoirradiation. The electrochemical characterization elucidated that these modifications of the structure obviously enhanced the electrocatalytic performance of the electrode, which was further verified by the simulated wastewater degradation experiments with reactive brilliant red X-3B. In addition, it was also found that the photoirradiation effectively enhanced the pollution degradation efficiency of the modified electrode, especially for the TiO2/Au/BDD-30 electrode.Keywords:boron-doped diamond;TiO2;Z-scheme;electrocatalysis;wastewater treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Guanjie Ma,Xingyu Li,Yuhao Long,Jiangtao Huang,Zongyan Zhang,Fucheng Liu,Peigang Han,Bin He
Boron-doped diamond (BDD) electrodes have been widely used in water treatment, e.g., degradation of antibiotics and pigments for water purification. Hydrogen peroxide production by two-electron electrochemical oxidation of water is a green and attractive method that has the potential to replace the conventional anthraquinone autoxidation (AO) process. In this study, BDD films were prepared on single-crystal silicon wafers by using hot-filament chemical vapor deposition (HFCVD) technique. Then, dense tubular nanostructure (nanotubes) arrays were prepared on the BDD films employing inductively coupled plasma (ICP) etching. Energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) proved the formation of oxygen-terminated nanostructures, which was ascribed to the oxygen plasma and the self-masking. The length of diamond nanotubes as well as the root diameter increased gradually and non-linearly with the increase of etching time. It was indicated by cyclic voltammetry (CV) analysis that the effective active area of the electrodes increased after etching, and variations of resulting reaction performance were observed. The oxygen-terminated and nanostructured BDD electrode obtained by etching with the optimized parameters features better electrocatalytic performance, with reduced oxidation potential and 46.8 % higher Faraday Efficiency (FE) for hydrogen peroxide production, compared to the original BDD sample. Therefore, the manufacturing of nanostructures is an effective method to improve the efficiency of BDD water oxidation for the production of hydrogen peroxide.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2013
·
IF 3.357
Chenhua Shu,Tonghua Sun,Jinping Jia,Ziyang Lou
A novel desulfurization process of gasoline was realized via sodium metaborate (NaBO 2 ) electroreduction with pulse voltage using a boron-doped diamond (BDD) thin film electrode under mild conditions. The results of cyclic voltammetry and 11 boron (B) nuclear magnetic resonance (NMR) confirmed that NaBO 2 was converted into sodium borohydride (NaBH 4 ) by electroreduction and the electroreduction voltage ranged from −1.2 V to −1.8 V. The factors that influenced desulfurization efficiency were investigated and the desulfurization efficiency reached more than 95% for model gasoline and more than 97% for real gasoline. The components of model gasolines before and after desulfurization were analyzed by gas chromatography/mass spectrometer (GC/MS) and the elements content of electrolytes and digestion solution of precipitate were determined by inductively coupled plasma (ICP). Results indicated that reductive desulfurization process mainly involved the cleavage of C–S bond and the hydrogenation of C–C double bond and B recycle was realized at the same time as desulfurization. Consequently, possible desulfurization mechanism was proposed. Desulfurization kinetics showed a pseudo-first-order toward thiophene or benzothiophene . All these results indicated that the gasoline desulfurization process via sodium metaborate electroreduction with pulse voltage using a BDD thin film electrode was feasible.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 14
·7584-7595
·
IF 11.9
Wei Dai,Ranhao Wang,Zhijie Chen,Shimao Deng,Changzhu Huang,Wenjun Luo,Hong Chen
Conversion of solar energy into hydrogen energy through photocatalytic water splitting is vital for addressing the energy crisis problem and achieving carbon neutrality. Herein, boron-doped carbon nitride (BCN) hollow nanotubes have been successfully fabricated via a boric acid-assisted co-crystallization templating approach. The as-synthesized BCN hollow nanotubes with the optimal boron doping concentration show a significantly improved photocatalytic hydrogen evolution efficiency of 3.0658 mmol g−1 h−1, which is 7.2 times higher than that of the well-explored bulk C3N4. The electron density is redistributed as caused by electron-deficient boron dopants, leading to extended visible light capture and accelerated charge transport. The remarkable performance enhancement is attributed to the overall synergetic effects of the unique spatial confinement in hollow nanotubes and exceptionally modulated band structure. This work demonstrates an efficient strategy to enhance photocatalytic activity via synergetic morphology engineering and band structure engineering, which paves the way for engineering carbon nitride materials for energy and environmental catalysis applications.
研究领域:
材料科学
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能源转换
·
环境催化
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Hongyang Ke,Meichuan Liu,Lu Zhuang,Zhengxin Li,Lifang Fan,Guohua Zhao
It is of great significance to develop efficient monitoring strategies with high sensitivity and selectivity for 17β-estradiol (E2), a typical steroidal hormones endocrine disrupting chemicals , in water samples. Here reports a novel practical electrochemical impedance aptasensor for the detection of E2 effectively and fast. A unique hierachical dendritic gold microstructure is constructed on boron doped diamond (BDD) electrode surface through a double template method. The obtained dendritic Au/BDD electrode has lower background current, better electrochemical performance and higher capacity to immobilize biomolecules. E2 aptamers which can specifically binding to E2 were immobilized on the surface of the dendritic Au/BDD electrode through Au-S interaction, obtaining a newly-typed E2 aptasensor. The aptasensor performed supersensitive and specific recognition capacity towards E2. Once E2 enters into the detecting system, it reacts with aptamers and enlarges the interfacial electron transfer resistance significantly, which leads to the increment of impedance signal and realizes the quantification of E2. Results show that the constructed E2 aptasensor exihbits a wide linear range with the logarithm of concentration of E2 from 1.0 × 10 −14 to 1.0 × 10 −9 mol/L with a femtomolar level detection limit of 5.0 × 10 −15 mol/L. High specificity is also evidenced by control experiments performed with the E2 aptasensor in a co-existing system including estriol , bisphenol A , nonyl phenol , diethyl phthalate , resorcinol and atrazine . Real water sample analysis showed the reliability and potential in practical environmental monitoring of the aptasensor. Besides, the aptasensor is easy to prepare, and the dendritic Au/BDD electrode can be a promising platform for design of other sensors.
研究领域:
分析化学
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环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jingju Cai,Minghua Zhou,Yuwei Pan,Xuedong Du,Xiaoye Lu
Efficient anode materials are essential to electrochemical advanced oxidation processes (EAOPs) for organic wastewater treatment. In this regard, blue TiO 2 nanotube arrays (Blue-TNA) anode was prepared for the first time in formic acid electrolyte by electrochemical self-doping and applied for electrochemical degradation of contaminants. Characterized by XPS, Raman and Mott-Schottky curves, the formation of Ti 3+ on Blue-TNA was confirmed. This anode was more efficient and had a higher hydroxyl radical production activity (1.7 × 10 −14 M) than BDD (9.8 × 10 -15 M), inducing a higher TOC and COD removal of 100 mg/L phenol with a lower energy consumption of 9.9 kW h/(kg COD) at current density 2.5 mA/cm 2 , pH 5 in 0.1 M Na 2 SO 4 , account for the lower accumulation of degradation intermediates. Both • OH and SO 4 •- were responsible for the degradation on Blue-TNA anode, while their contributions differed greatly with that of BDD, and could be affected and regulated by the operating parameters like current density, initial pH and Na 2 SO 4 concentration. Blue-TNA anode represented a relative stable performance for 5 cycles degradation of 100 mg/L phenol for each cycle of 300 min, and such an oxidation capacity could be easily regenerated by electrochemical reduction in formic acid. Blue-TNA anode had an excellent performance on the TOC removal and MCE especially at low current density of 2.5 mA/cm 2 when compared with other anodes. Therefore, Blue-TNA anode is hopeful a promising and cost-effective anode for electrochemical oxidation.
研究领域:
环境科学
·
电化学
·
水处理
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongjin Wang,Shuangqing Zhou,Tao Wang,Zhiye Zhou,Yanggen Huang,Stephan Handschuh-Wang,Hongyu Li,Ying Zhao,Yongbing Tang
Long-term exposition of electrodes to aqueous media inevitably results in biofouling and adhesion of bacteria, reducing the electrolysis efficiency of electrodes for water treatment. To ensure technically efficient antifouling of materials for durable electrodes, hierarchical micro-/nano structured boron-doped diamond (BDD) electrodes were designed and synthesized. Multi-level structured BDD was coated on titanium mesh by a bottom-up strategy, based on a combination of self-assembly seeding and hot filament chemical vapor deposition (HFCVD) growth. The morphology of the BDD coating can be controlled by manipulating the seeding density and boron doping concentration. The designed micro/nano hierarchical structure of the BDD electrode suppressed bacterial adhesion greatly and exhibited excellent anti-biofouling efficiency with an antibacterial rate of ∼ 93 %, which entails simplified self-cleaning and durable BDD-coated electrodes. The BDD-coated electrodes were employed to electrochemically treat Escherichia coli -contaminated water, killing virtually all bacteria (≥99.9 %) in 1 min. Finally, real river water was electrochemically treated, reducing the chemical oxygen demand (COD) down to 5 mg/L in 4 h. The excellent performance shows the great potential of the structured BDD electrodes for long-term water purification .
研究领域:
材料科学
·
环境工程
·
电化学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）