ACTA PHYSICO-CHIMICA SINICA
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2023
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IF 10.9
Wencheng Fang,Dong Liu,Ying Zhang,Hao Feng,Qiang Li
Photoelectrochemical water splitting using semiconductor materials is one of the most promising methods for converting solar energy into chemical energy. Among the commonly used semiconductors, p-type CuBi 2 O 4 is considered one of the most suitable photocathode materials and can allow a theoretical photocurrent density of about 20 mA·cm −2 for photoelectrochemical water splitting. However, due to severe charge carrier recombination, the obtained photocurrent density is much lower than the theoretical value. Highly efficient photoelectrochemical performance relies on fast charge carrier separation and transport, and prompt reaction kinetics. In this study, we report the development of a polyoxometalate-modified CuBi 2 O 4 /Mg-CuBi 2 O 4 homojunction photocathode to improve both the bulk and interfacial charge carrier transport in the photocathode. For the bulk of the photocathode, the built-in electric field originating from the CuBi 2 O 4 /Mg-CuBi 2 O 4 homojunction promotes the migration of photo-excited electrons on the conduction band from pure CuBi 2 O 4 to Mg-doped CuBi 2 O 4 . Additionally, the electric field facilitates the transfer of holes from the valence band of Mg-doped CuBi 2 O 4 to pure CuBi 2 O 4 . This directional transfer of both photo-excited electrons and holes plays a significant role in promoting separation and suppressing the recombination of the charge carriers. On the surface of the photocathode, the reduced polyoxometalate co-catalyst Ag 6 [P 2 W 18 O 62 ] (AgP 2 W 18 ) was used as a proton sponge to accelerate surface reaction kinetics and suppress carrier recombination. These synergistic effects improved the photo-generated charge carrier transfer and reaction kinetics. As a result, the novel photocathode displayed excellent photoelectrochemical properties, and the photocurrent density was observed to be −0.64 mA·cm −2 at 0.3 V vs. RHE, which is better than that of −0.39 mA·cm −2 for a pure photocathode. Furthermore, the novel photocathode had an applied bias photon-to-current efficiency (ABPE) higher than 0.19% at 0.3 V vs. RHE. In contrast, the pure photocathode had an ABPE of ~0.12% under the same conditions. Additionally, when H 2 O 2 was used as an electron scavenger, the photocurrent density was −3 mA·cm −2 at 0.3 V vs . RHE, which is an improvement of approximately 1.5 times compared to the pure photocathode. Furthermore, the charge separation and charge injection efficiency of the novel photocathode were significantly improved compared with the pure photocathode. The experimental results conclusively indicate that the formation of the CuBi 2 O 4 /Mg-CuBi 2 O 4 homojunction and AgP 2 W 18 modification played a significant role in the improved performance of the CuBi 2 O 4 photocathode. The performance of the novel photocathode was comparable with the results reported in previous studies, demonstrating its promising potential in real applications. Download: Download high-res image (83KB) Download: Download full-size image
研究领域:
材料科学
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能源转化
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光催化
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DOI
高影响因子
e-Journal of Surface Science and Nanotechnology
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2023
·Vol. 21
·期 1
·1-8
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IF 0.7
J. F. Huang,F. H. Tao,F. Y. Li,Z. Y. Cai,L. Z. Pei
Polypyrrole (PPy)/CuBi2O4 nanosheets (NSs) were prepared by an in situ polymerization process and the NS-modified glassy carbon electrode (GCE) for electrochemical determination of benzoic acid was studied. The structure, morphology, and functional groups of the PPy/CuBi2O4-NSs were analyzed by X-ray diffraction, transmission electron microscopy (TEM), high-resolution TEM, and Fourier transform infrared spectroscopy. The obtained NSs contain a tetragonal CuBi2O4 phase, and nanoscale PPy particles attach to the surface of the NSs. The electrochemical responses of the PPy/CuBi2O4-NS-modified GCE in 0.1 M KCl solution with benzoic acid were investigated by the cyclic voltammetry (CV) and electrochemical impedance spectroscopy. An irreversible CV peak is located at −0.84 V on the PPy/CuBi2O4-NS-modified GCE in 2 mM benzoic acid and 0.1 M KCl solution. The intensities of the CV peaks show linear variation with increasing the scan rate and concentration of benzoic acid. The linear range is 0.001−2 mM with a detection limit of 0.52 μM. The PPy/CuBi2O4-NS-modified GCE shows high stability and reproducibility. The prepared PPy/CuBi2O4-NSs have great promise in the electrochemical detection of benzoic acid.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 19
·3341
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IF 4.329
Xiuhua Yuan,Yeling Liu,Hui Yuan,Bingxin Liu,Tianyu Guo,Huawei Zhou,Xia Li
While the CuBi2O4-based photocathode has emerged as an ideal candidate for photoelectrochemical water splitting, it is still far from its theoretical values due to poor charge carrier transport, poor electron–hole separation, and instability caused by self-photoelectric-corrosion with electrolytes. Establishing synthesis methods to produce a CuBi2O4photocathode with sufficient cocatalyst sites would be highly beneficial for water splitting. Here, the platinum-enriched porous CuBi2O4nanofiber (CuBi2O4/Pt) with uniform coverage and high surface area was prepared as a photocathode through an electrospinning and electrodeposition process for water splitting. The prepared photocathode material was composed of a CuBi2O4nanofiber array, which has a freestanding porous structure, and the Pt nanoparticle is firmly embedded on the rough surface. The highly porous nanofiber structures allow the cocatalyst (Pt) better alignment on the surface of CuBi2O4, which can effectively suppress the electron–hole recombination at the electrolyte interface. The as-fabricated CuBi2O4nanofiber has a tetragonal crystal structure, and its band gap was determined to be 1.8 eV. The self-supporting porous structure and electrocatalytic activity of Pt can effectively promote the separation of electron–hole pairs, thus obtaining high photocurrent density (0.21 mA/cm2at 0.6 V vs. RHE) and incident photon-to-current conversion efficiency (IPCE, 4% at 380 nm). This work shows a new view for integrating an amount of Pt nanoparticles with CuBi2O4nanofibers and demonstrates the synergistic effect of cocatalysts for future solar water splitting.Keywords:electrospinning;CuBi2O4nanofiber;photocathode;water splitting
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
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2021
·Vol. 8
·期 16
·3863-3870
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IF 6.569
Yuwei Zhang,Lina Wang,Xiaoxiang Xu
CuBi2O4 and CuWO4 films (2 × 2 cm) on an FTO substrate have been fabricated to construct an all-copper-based oxide tandem cell for solar-driven photoelectrochemical (PEC) water splitting. CuBi2O4 and CuWO4 films are of opposite semiconductivity, and exhibit a large difference in the onset potentials and matched light absorption, making them ideal for a tandem configuration for solar energy conversion. Under optimal conditions, the tandem cell (4 cm2) exhibits a water splitting photocurrent of 0.3 mA without an external bias under simulated solar insolation. The low cost, non-toxicity, good stability and easy manufacture of this copper-based oxide tandem cell warrant promising applications in the field of solar energy conversion.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 11
·期 1
·149-157
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IF 14.511
Yingfei Hu,Jun Wang,Huiting Huang,Jianyong Feng,Wangxi Liu,Hangmin Guan,Lingyun Hao,Zhaosheng Li,Zhigang Zou
Passivating surface traps plays a crucial role in mitigating the efficiency loss of solar water-splitting electrodes. However, the associated surface-trap passivation approaches require the introduction of an overlayer, complicating the fabrication process and increasing the capital cost of photoelectrodes. Herein, using CuBi2O4 as a prototype, an in situ surface-trap passivation strategy is developed, which yields a beneficial 90 mV anodic shift in hydrogen-evolution onset. Detailed mechanism investigations prove that the intentionally added Mg2+ ions in the precursor gradually segregate as MgO and enrich at the grain boundaries/surface of the CuBi2O4 multicrystalline, porous film during annealing, via which surface traps stemming from dangling bonds are spontaneously passivated; measurements of photovoltage generation characteristics and carrier lifetime validate the favorable roles of the MgO passivator in CuBi2O4 photocathodes. A bias-free water-splitting device is assembled using MgO-passivated CuBi2O4 and Mo-doped BiVO4 as the photocathode and photoanode respectively in a tandem configuration, delivering a solar-to-hydrogen conversion efficiency of approximately 0.41%.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 3
·1-12
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IF 2.8
Wang Zhenxing,Luo Qingsong,Huang Yiheng,Chen Yan,Wang Yimu,Feng Changhao
The sensitive and rapid detection of n-butanol gas is crucial for ensuring industrial safety, environmental protection, and biological health. In this study, we employed electrospinning to fabricate a series of CuBi 2 O 4 nanofibers and nanotubes, followed by thorough characterization and analysis of their structural and functional features using XRD, FE-SEM, TEM, and XPS techniques. The gas-sensing performance demonstrates that CuBi 2 O 4 nanotubes (CBO-500) exhibit an exceptionally rapid response to n-butanol, highlighting their potential for use in high-sensitivity n-butanol sensors. The sensor exhibited a response of 12.30–10 ppm n-butanol at 150 °C, with a rapid response time of 2 s and a recovery time of 41 s. Furthermore, the sensors based on CBO-500 nanotubes exhibited excellent selective. In addition, this study elucidates the underlying mechanisms responsible for the gas-sensing properties of CuBi 2 O 4 nanotubes toward n-butanol.
研究领域:
材料科学
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环境科学
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传感器技术
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2025
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IF 6.3
Chenglin Zhang,Su Zhan,Feng Zhou
Addressing the issues of hazardous organisms and their facilitated diffusion is crucial for ensuring the long-term viability of maritime industries and safeguarding marine ecosystems. In this study, a p-n heterostructure scheme of CuBi 2 O 4 @CeO 2 photocatalysts was established by a facile wet chemical in-situ deposition for marine bacteria inactivation, experimental results demonstrate that the introduction of CeO 2 enhances overall bacterial sterilization efficacy, 15%CuBi 2 O 4 @CeO 2 exhibits the priority sterilization efficiency about 3.3, and 2.8 times to pure CeO 2 and pure CuBi 2 O 4 , respectively, and the inactivation effects of •OH is superior to the other mainstream active species. Moreover, incorporating CeO 2 film on the surface of CuBi 2 O 4 contributes to the selectively production of active species, shorten the electron transfer distance, and improves light response efficiency which derive from the innovative heterostructure design, a rational connection bridge between CeO 2 and CuBi 2 O 4 based on the band structure positioning, facilitates faster separation and transfer of photo-generated carriers while simultaneously suppressing charge carriers recombination. This paper offers an methodology and construction of harmless heterostructure photocatalysts for ballast water treatment and fosters a deeper understanding of the underlying photocatalytic mechanisms.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2013
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IF 2.39
Yongyong Deng,Youjian Chen,Bingang Chen,Jianhua Ma
In this study, a series of p-CuBi 2 O 4 /n-NaTaO 3 heteronanostructures were synthesized with the grinding–annealing method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalysts exhibit enhanced photocatalytic activity for methyl blue dye degradation under visible-light irradiation. The highest photocatalytic degradation efficiency was observed when the sample calcined at 500 °C with 50 wt.% CuBi 2 O 4 content. On the basis of the calculated energy band positions, the mechanism of enhanced photocatalytic activity was discussed.
研究领域:
材料科学
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光催化化学
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环境功能材料
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纳米材料
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能源与环境技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Wenhao Li,Su Zhan,Lin Zhou,Yong Wang,Feng Zhou
Electrode materials are pivotal to advancing the deployment of photoelectrochemical (PEC) seawater splitting. Carbon materials hold great potential for modifying semiconductors to fabricate high-performance photocathodes, but are limited in seawater by the Ca 2+ and Mg 2+ . Herein, a microwave-synthesized carbon dots ( m -CDs) were demonstrated as electron donors in composite photocathode materials to enhance their performance for seawater splitting. The as-prepared m -CDs/CuBi 2 O 4 photocathode exhibited a photocurrent density of 0.183 mA cm −2 at 0.4 V vs. RHE in simulated seawater, which was outperforming the pristine CuBi 2 O 4 (0.102 mA cm −2 ) and hydrothermal-synthesized carbon dots (h-CDs) modified CuBi 2 O 4 (0.106 mA cm −2 ) samples. The structural characterization results show that the surface of m -CDs is rich in acidic groups. These functional groups will significantly increase the H + concentration on the catalyst surface during the HER process, inhibit the rise of surface pH, thereby preventing Ca 2+ /Mg 2+ from forming hydroxides and reducing the catalytic performance. This study not only presents a metal-free carbon material to enhance the photocathode performance for seawater splitting, but also offers a theoretical foundation for the rational design of carbon materials in this field.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Liruhua Zhang,Qianhong Shen,Feilong Huang,Libei Jiang,Jie Liu,Jiansong Sheng,Yue Li,Hui Yang
A novel 0D/1D CuBi 2 O 4 @WO 3 nanofiber-membrane photocatalyst with step-scheme (S-scheme) heterojunction was fabricated by means of the electrospinning method. The disintegration of CuBi 2 O 4 microspheres under a high voltage electrospinning process led to the simultaneous formation of CuBi 2 O 4 nanoparticles on WO 3 nanofibers, therefore constructing well dispersed CuBi 2 O 4 @WO 3 nano-heterojunctions. The CuBi 2 O 4 @WO 3 composite photocatalyst followed the S-scheme charge transfer mechanism, which promoted the efficient charge transfer across the interface, thereby solving the problem that the narrow-bandgap CuBi 2 O 4 had strong light-harvesting ability but easy recombination of photo-generated carriers. Moreover, such S-scheme heterojunction also achieved the spatial separation of photo-induced electrons and holes while ensuring the promising redox abilities in both WO 3 and CuBi 2 O 4 . Hence, the CuBi 2 O 4 @WO 3 composite photocatalyst exhibited excellent photocatalytic activity for photocatalytic degradation of antibiotics in environmental remediation under weak-visible-light irradiation (5 W LED lamp), and its photocatalytic activity for tetracycline degradation was significantly improved, which was 8.1 times and 3.6 times than that of WO 3 nanofibers and pure CuBi 2 O 4 microspheres, respectively. The radical species trapping tests indicated that·O 2 − and h + were the main active radicals in the tetracycline photodegradation reaction, and the high-performance liquid chromatography-mass spectrometry test clarified three possible degradation reaction pathways of tetracycline. This work presented a facile method to fabricate 0D/1D CuBi 2 O 4 @WO 3 composite nanofiber photocatalyst with well-dispersed CuBi 2 O 4 @WO 3 nano-heterojunctions, and also provided a new idea for the preparation of new nanocomposite photocatalyst based on electrospinning process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Yulu Xu,Zixin Li,Xia Hu,Xiang Wu,Wei Chen,Shujing Zhou,Jinjing Li,Chenze Qi,De-Kun Ma
CuBi 2 O 4 (CBO) semiconductor composed of low cost and environmentally friendly Cu, Bi, and O elements possesses relatively narrow band gap, appropriate energy band position, and very positive photocurrent onset potential, which make it promising for photoelectrochemical (PEC) O 2 reduction reaction (ORR). However, low separation and transfer efficiency of photogenerated carriers and poor product selectivity limit its further application in PEC ORR toward H 2 O 2 production. In this work, we report F − ions doped CuBi 2 O 4 (F-CBO) nanorod arrays with enhanced PEC ORR performance for H 2 O 2 generation. PEC ORR activity of CBO nanorod arrays was obviously enhanced through decreasing the sizes of nanorods. Furthermore, the doping of F − ions into CBO lattice promoted the separation and transfer of photogenerated carriers and significantly improved the selectivity of ORR toward H 2 O 2 path. As a result, 0.85 mmol/L of H 2 O 2 could be achieved on the F-CBO photocathode within 45 min under simulated AM1.5G sunlight illumination (100 mW cm −2 ), which is 2.8 times higher than that obtained on the pristine counterpart. The roles of fluorine doping were revealed based on experimental results and density functional theory (DFT) calculations. The combination of morphology and surface doping engineering provides a new strategy for designing highly efficient photocathod for PEC ORR to H 2 O 2 production.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
DOI
高影响因子
CARBON
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2025
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IF 11.6
Ziyi Jiang,Qunfeng Yue,Changhong Guo,Huiming Lin
Here, CuBi 2 O 4 /carbon dots (CBO-CDs) were prepared to reveal their high-performance of solar photocatalytic sterilization. Firstly, CuBi 2 O 4 nanoflower assembled by nanotubes were synthesized via a hydrothermal strategy through the regulation of pH condition. The primary nanotubes shorten the distance for charge transfer, and the novel hierarchical structure also provides abundant active sites to enrich substrate. After the loading of CDs, the composites enhance light harvesting across the entire spectrum. Moreover, they possess Z-scheme mechanism endowing efficient charge separation and high redox potential. The photogenerated electrons can capture the dissolved O 2 to produce reactive oxygen species (ROS), which can induce cellular inactivation by cleaving cell membrane and degrading cytogenetic constituents. The notable solar photocatalytic ability not only inactivate E. coli (96.88 ± 1.50 %) and S. aureus (99.96 ± 1.41 %) but also can damage their biofilms (above 91.70 ± 2.54 %) efficiently. Moreover, the practical complex lake sample was also investigated to reveal great bacteriostatic (97.65 ± 1.30 %) and methylene blue degradation (99.91 ± 1.40 %) ability, simultaneously. Additionally, CBO-CDs also can disinfect mask under irradiation, contributing to the development of self-cleaning mask. Given their broad-spectrum antimicrobial, novel biocompatibility, and solar-activation, CBO-CDs possess great practical application potential for sterilization.
研究领域:
材料科学
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环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）