Inorganic Chemistry Frontiers
·
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
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Hong-Si Guo,Wenfeng Zhao,Qingmei Ge,Nan Jiang,Mao Liu,Hang Cong
A promising method for producing hydrogen from solar energy and converting it into chemical fuels is photoelectrochemical (PEC) water splitting. In this paper, a novel photoanode is prepared by hydrothermal growing of nanorod CdS/g-C 3 N 4 /Q[7] heterojunction on FTO substrate for photoelectrochemical water splitting to produce hydrogen. In this method, Q[7]-doped g-C 3 N 4 is tightly combined with CdS composite and substrate, which significantly improves the separation and migration of photogenerated carriers in g-C 3 N 4 /Q[7] and CdS, and effectively reduces the internal resistance of the photoanode. Compared with the free CdS NRs, the PEC performance of the heterojunction CdS/g-C 3 N 4 /Q[7]-10 is significantly enhanced with the improved photocurrent density of 1049.7 μA/cm 2 under AM 1.5 G (100 mW/cm 2 ) simulated sunlight, which is 3.6 times that of pristine CdS and 2.6 times that of FTO-CdS/g-C 3 N 4 under the same conditions. The external bias photocurrent conversion efficiency and photohydrogen conversion efficiency of CdS/g-C 3 N 4 /Q[7]-10 photoanode at 0.7 V (relative to RHE) are measured to be both 0.31 %, as 3.1 times high as that of the original CdS NRs (0.10 %), and 2.07 times high as that of FTO-CdS/g-C 3 N 4 (0.15 %). The generation of heterostructure with interfacial interaction reduces the recombination of photogenerated electron-hole pairs, to enhance the charge transfer of water oxidation kinetics, allowing electrons to quickly transfer through the external circuit to the counter electrode for H + reduction to produce H 2 . A schematic diagram of the photoelectrochemical water splitting hydrogen evolution process with the heterojunction CdS/g-C 3 N 4 /Q[7]-10 is systematically proposed.
研究领域:
材料科学
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能源转换
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光电化学
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yuanmei Xu,Wenbing Chen,Xueshi Li
Much attention has been focused on the fabrication of TiO 2 microspheres due to their excellent properties and attractive potential in many fields. Here, undoped 3D hierarchical TiO 2 microspheres (TMS) were synthesized in situ on Ti mesh using a hydrothermal method by varying NaOH concentration, reaction time and temperature. The 3D TMS grown along the surface of the woven wires of the Ti meshes, using the metal Ti meshes as a substrate, which resulted in improved conductivity. Meanwhile, the original Ti mesh with the macroporosity (due to the 15 % open area of the mesh) can act as fast proton mass diffusion. As a result, the flexible TMS-Ti photoelectrodes exhibit an excellent current density of 1.63 mA/cm 2 at a potential of 1.23 V (vs Ag/AgCl). Therefore, the in situ synthesis of TiO 2 microspheres on Ti mesh is highly desirable for flexible devices.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
N’dri Dieudonné Diby,Yueqin Duan,Patrick Atheba Grah,Fengshi Cai,Zhihao Yuan
In the photoelectrochemical (PEC) water splitting for the hydrogen production, the fabrication of a stable and efficient photocatalyst semiconductor remains a challenge. CdS, which is one of most used chalcogenide materials, coupled with metal oxide semiconductor exhibit a generally low durability. TiO 2 nanorods arrays (TNR) sensitized with CdS were synthesized via hydrothermal method and denoted as TNR-CdS. CdS deposition on TNR surface was controlled by regulating the hydrothermal reaction time. The samples were characterized by X-ray diffraction, Raman spectroscopy , scanning electronmicroscopy, X-ray photoelectron spectroscopy, and UV-visible absorption. A high PEC performance as well as a great CdS sensitized TNR photoanodes stability were exhibited. These results could be due to the intimate contact between CdS and TNR, favoring a fast separation of photogenerated charge carriers. The optimal PEC performance was achieved when CdS was deposited on TNR for 10 h. Under AM 1.5G illumination at applied potential of 0 V vs Ag/AgCl, TNR-CdS (10 h) is found to have a photocurrent density of 6.5 mA/cm 2 against 2.25 mA/cm 2 for TNR. Additionally, TNR-CdS (10 h) presented a photoconversion efficiency of 2.5% at −0.4 V vs Ag/AgCl, while that of TNR was 0.9% at-0.35 V vs Ag/AgCl. TNR-CdS showed great stability with and without sacrificial reagent. These results were confirmed by electrochemical impedance spectroscopy measurements, where the rapid transfer/transport and separation of photogenerated charge carriers were highlighted.
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
Nature Catalysis
·
2025
·
IF 44.6
Wang Jun,Liu Kang,Liao Wanru,Kang Yicui,Xiao Hanrui,Chen Yingkang,Wang Qiyou,Luo Tao,Chen Jiawei,Li Hongmei,Chan Ting-Shan,Chen Shanyong,Pensa Evangelina,Chai Liyuan,Liu Fangyang,Jiang Liangxing,Liu Changxu,Fu Junwei,Cortés Emiliano,Liu Min
Achieving efficient carrier separation in transition-metal-oxide semiconductors is crucial for their applications in optoelectronic and catalytic devices. However, the substantial disparity in mobility between holes and electrons heavily limits device performance. Here we develop a general strategy for enhancing hole mobility via reducing their effective mass through metal vacancy (V M ) management. The introduction of V M yields remarkable improvements in hole mobility: 430% for WO 3 , 350% for TiO 2 and 270% for Bi 2 O 3 . To illustrate the importance of this finding, we applied the V M concept to photoelectrochemical water splitting, where efficient carrier separation is highly coveted. In particular, V M -WO 3 achieves a 4.4-fold enhancement in photo-to-current efficiency, yielding a performance of 4.8 mA cm −2 for both small- and large-scale photoelectrodes with exceptional stability for over 120 h.
研究领域:
材料科学
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光电化学
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产品关联
DOI
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 20
·5269-5275
·
IF 4.853
Lu Wang,Jinzhan Su,Liejin Guo
Graphical Water Splitting : The synergistic effect of organic dehydration in esterification and inorganic precipitation of semiconductor with surfactant was proposed as a hybrid strategy to synthesize highly uniform monodisperse BiVO 4 nanosphere. The generated water in esterification provides the reverse micelle nanoreactor to precipitate BiVO 4 cluster, which then self-assembly aggregated to be BiVO 4 nanosphere. Furthermore, different nanoporous BiVO 4 photoanodes composing of BiVO 4 nanospheres were obtained by a simple drop-casting method for photoelectrochemical water splitting. Monodisperse semiconductor sphere holds great potential for a wide variety of application as a basic building block. Herein a binary oxide, BiVO 4 , with highly uniform monodisperse nanosphere of 125 nm diameter was primarily synthesized via a hybrid method with PVP assisted in organic solvent. After investigating the function of PVP and the emergence of esterification in solvent, we proposed a formation mechanism of amorphous BiVO 4 nanosphere, including the precipitation of BiVO 4 clusters in reverse micelles and the self-assembly aggregation of BiVO 4 clusters to be BiVO 4 nanospheres. The generated water in esterification provides a nanoreactor to precipitate BiVO 4 cluster, in return, the precipitation by using water catalyzes the process of esterification in ethanol with acetic acid. This hybrid reaction of inorganic BiVO 4 precipitate and organic esterification opens a novel avenue to couple nano inorganic chemistry with organic dehydration synthesis, achieving green chemistry for sustainable development. Furthermore, highly efficient nanoporous BiVO 4 photoanodes composed of BiVO 4 nanospheres for water splitting were obtained using a simple drop-casting method and optimized for their photocurrent density by calcination temperatures. This hybrid reaction strategy could be applied to synthesize other semiconductors with nanosphere toward novel low-cost structures and devices.
研究领域:
材料科学
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化学
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能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Yumin Li,Qingping Dai,Zhibin Qiu,Yuanmao Pu,Hong Tian,Jun Wei,Bing Lv,Wenzhong Wang
Photoelectrochemical (PEC) performance of semiconductor photoanode can be significantly improved by regulating the energy band alignment to promote carrier separation. This study demonstrates the first application of CdZnS (CZS) nanoparticles to modify FeVO 4 (FVO) nanostructure phoyoanode for PEC water splitting . The constructed FVO/CZS photoanode exhibits significantly enhanced PEC performance with a zero-bias solar-driven photocurrent density of 1.00 mA/cm 2 , which is 11 times and 4.5 times that of unmodified FVO and CZS, respectively. The Tests of the optical absorption and electrochemical spectroscopy demonstrate that the modification of CZS nanoparticles not only improves the light harvesting ability of the FVO/CZS heterojunction nanostructures in the wavelength of 300–500 nm but also establishes a type II band alignment between the interface of FVO and CZS that is conducive to the transport and separation of the charge carriers and prolongs charge lifetime. Consequently, synergistic actions of the improved light harvesting capacity, effective charge transport and separation and the prolonged carrier lifespan enable the designed and fabricated FVO/CZS heterojunction photoanode to get substantially augmented PEC water splitting performance. This work supplies an innovative guidance for designing FVO-based photoanodes to improve photoelectric conversion behavior from the perspective of interface engineering.
研究领域:
材料科学
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能源工程
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Tianyi Zhang,Jing Lu,Xue Li,Zhitao Zou,Mengdan Kong,Jixiang Xu,Vladimir Turkevich,Haifeng Lin,Yanyan Li,Lei Wang
Optimizing the Z-scheme charge transmission of lateral heterojunction constructed by single-layer (SL) nanosheets is an appealing yet challenging tactics to boost photocatalytic efficiency for solar fuel production and environmental remediation. Herein, we reported the edge/corner-specific growth of SL ZnIn 2 S 4 -MoSe 2 lateral heterojunction with intensified Z-scheme charge transmission through intimate Mo-S connection and S vacancies (V S ) engineering. The Mo-S chemical bonds inside ZnIn 2 S 4 -MoSe 2 heterojunction offer a speedy channel for Z-scheme charge transmission as confirmed via surface photovoltage spectroscopy, radical production, and in situ photo-irradiated X-ray photoelectron spectroscopy tests as well as density functional theory calculation, while V S engineering enlarges Fermi level difference between ZnIn 2 S 4 and MoSe 2 to strengthen internal electric field and driving force for photo-carriers transmission, resulting in an excellent photocatalytic H 2 evolution (PHE) capability. Isotopic labeling experiment verified the photocatalytic water reduction by ZnIn 2 S 4 -MoSe 2 heterojunction, which exhibited a visible-light-driven PHE rate up to 55.70 mmol g −1 h −1 (or 550.70 μmol/10 mg/h) with an apparent quantum yield reaching 38.9 % at 400 nm. Moreover, the ZnIn 2 S 4 -MoSe 2 heterojunction also possessed a robust stability during long-term photocatalytic reaction. The research findings could inspire new idea to enhance the photocatalytic capability of two-dimensional (2D) heterojunction by strengthening Z-scheme charge transmission at atomic level.
研究领域:
材料科学
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能源化学
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表面物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Jinxing Yu,Yawei Wang,Cai Shen,Xiaoxiang Xu
Titanoniobate nanosheets with thickness down to a few nanometers have been prepared by ion exchange and subsequent exfoliation treatment on a bulk layer compound KTiNbO 5 . Superior photocatalytic H 2 production activity has been realized on these nanosheets, surpassing their mother compound KTiNbO 5 . More interestingly, their photocatalytic activity has been successfully extended into visible light region when Cr/Nb co-dopants are introduced into nanosheets. The Cr/Nb modified nanosheets show apparent quantum efficiency as high as 2.75% at 420 ± 20 nm for H 2 production, outperforming a number of doped metal oxides photocatalysts. Such high photocatalytic activity origins from their tiny thickness and a much enlarged surface area that favors charge separation and transfer. Their little dependence on cocatalyst for H 2 production suggest that dopants Cr may also serve as catalytic reaction sites as a substantial fraction of Cr dopants are accommodated at the surface. This facile approach to fabricate ultrathin 2D semiconductor as well as versatility of doping strategy open new playground for the design and development of efficient visible light active photocatalysts.
研究领域:
材料科学
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光催化
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纳米科技
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能源化学
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半导体物理
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
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2025
·
IF 6.3
Fuhao Liu,Zhiguo Yuan,Sen Zhao,Quande Che,Qian Ma,Junpeng Wang
Tetragonal BiVO 4 nanorod array exhibits excellent carrier transport properties, but due to its p-type conductivity, it can only be used as a photocathode. In this study, an n-type tetragonal BiVO 4 nanorod array doped with molybdenum was successfully fabricated on fluorine-doped tin oxide (FTO) glass substrates via the hydrothermal method. The doping of Mo and its corresponding concentration were accurately ascertained through X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma (ICP) techniques. Computational simulations revealed that Mo doping induces a shallow donor level beneath the conduction band of BiVO 4 . Notably, the structure and morphology of BiVO 4 did not undergo significant changes after Mo doping, but the conductivity type and conductivity of the surface samples were greatly improved as evidenced by Mott-Schottky and conductive atomic force microscopy (C-AFM) measurements. Impressively, the onset potential for oxygen production when utilized as a photoanode was merely 0.2 V vs RHE. More importantly, although its conduction band position is slightly lower than the hydrogen production potential, the doped sample still demonstrated outstanding activity in water splitting for hydrogen generation.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Select
·
2021
·Vol. 2
·期 11
·2135-2147
·
IF 0
Puhong Wen,Xiaowen Jiang,Qian He,Dengwei Hu,Lijun Ren,Weixing Zhao
The tetragonal phase Nb 2 O 5 (T-Nb 2 O 5 ) nanobelts with preferentially exposed the (010) facet have been successfully prepared for the first time by insitu topological reaction using the KNb 3 O 8 nanobelts as the precursor. Meanwhile, the transformation mechanism of the crystal structure and morphology from the layered KNb 3 O 8 nanobelt to the T-Nb 2 O 5 nanobelt was revealed in detail by using XRD, FE-SEM, TEM, HRTEM, SAED, UV-vis DRS, EDX, XPS, and Raman spectra. In addition, Ag deposited T-Nb 2 O 5 (Ag/T-Nb 2 O 5 ) nanobelts were prepared by photo-reduction reaction. The photoelectrochemical properties of the T-Nb 2 O 5 nanobelts and Ag/T-Nb 2 O 5 nanobelts as a photocatalyst were evaluated by splitting water under simulated sunlight. The results show that the photocurrent density generated by the prepared Ag/T-Nb 2 O 5 sample is 48.1 µA∙cm −2 , which is 2.3 times that of the T-Nb 2 O 5 sample, and the prepared tetragonal phase T-Nb 2 O 5 nanobelts produce a photocurrent value 1.5 times that of the contrast orthogonal phase O-Nb 2 O 5 nanosheets. It indicates that the (010) facet of the tetragonal phase Nb 2 O 5 is one of the highest photocatalytic active surfaces, and the visible light utilization efficiency of the T-Nb 2 O 5 nanobelt with Ag deposited on the surface has been significantly improved, which implies that it has potential applications in the field of photocatalysis.
研究领域:
材料科学
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纳米科技
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光催化
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能源化学
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半导体材料
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表面科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）