JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Hanlu Zeng,Yunlan Xu,Dengjie Zhong,Qingmei Qiao,Yuqin Yang
The performance of a photocatalytic fuel cell (PFC) depends on its photoelectrode. In this work, a novel three-dimensional flower-like hierarchical photoanode Zn Zr MOF/FeWO 4 /BiOBr/Ti was synthesized, characterized and applied in PFC to degrade rhodamine B and generate electricity simultaneously. The characterization results of XRD, SEM, EDS, FI-IR, DRS, and XPS show that the photoanode was successfully prepared. The loading of FeWO 4 and Zn Zr MOF widened the nanosheet spacing of BiOBr, which enhanced the light absorption intensity, broadened the light absorption band edge from 467.6 nm to 490.2 nm, and increased the photocurrent density from 0.0149 mA/cm 2 to 0.156 mA/cm 2 . The maximum photocurrent density, maximum power density, degradation rate , and FF of the PFC with the prepared photoanode were respectively 0.256 mA·cm −2 , 22.65 μW·cm −2 90.48 % (1 h), and 0.216, which were far higher than those of PFCs with mono and binary photoanodes. The strong photocatalytic performance of the photoanode is attributed to the type II heterojunction formed between BiOBr and FeWO 4 , which helps to separate electron-hole pairs. The main reactive materials responsible for degrading rhodamine B are h + and ·O 2 - . This research provides a new idea for developing an efficient visible light response photoanode.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 1
·1-8
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IF 2.584
Zhou Chenglin,Liao Gengcheng,Qiao Hui,Qi Xiang
A novel MoS 2 /Ag 2 CO 3 Z-scheme system was synthesized by a simple chemical depositing method. The morphology and material components of MoS 2 /Ag 2 CO 3 Z-scheme system were confirmed by scanning electron microscopy and Raman spectroscopy. Photoelectrochemical (PEC) tests demonstrated that the photocurrent density of MoS 2 /Ag 2 CO 3 Z-scheme system can reach up to 13 µA/cm 2 in 0.5 M Na 2 SO 4 solution at a bias voltage of 0.5 V, which is 44 times more than pure MoS 2 , as well as 13 times higher than pure Ag 2 CO 3 . Lastly, the stability measurement of MoS 2 /Ag 2 CO 3 Z-scheme system in 0.5 M Na 2 SO 4 solution was carried out showing no obvious difference after processing 50 cycles. This work demonstrates that the MoS 2 /Ag 2 CO 3 Z-scheme system may have a great potential application in photocatalytic water splitting.
研究领域:
材料科学
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能源科学
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光催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Dan Wang,Ying Chen,Yang Zhang,Xintong Zhang,Norihiro Suzuki,Chiaki Terashima
Extremely rapid high temperature annealing (ER-HTA) was used to boost the photoelectrochemical (PEC) performance of hematite thin film deposited on a TiO 2 nanosheet-modified SnO 2 :F substrate (FTO-TN-HM). The PEC performance of FTO-TN-HM photoanodes were strongly enhanced with increasing ER-HTA temperatures from 700 to 820 °C with a holding time as short as 30 s. The photocurrent density of FTO-TN-HM photoanode treated by ER-HTA at 800 °C was 0.49 mA cm -2 and interfacial hole transfer efficiency of 32% was achieved at 1.23 V vs. RHE, which were 18.8 and 16 times as great as FTO-TN-HM photoanodes annealed at 500 °C for 30 min, respectively. The effect of ER-HTA on the PEC performance of FTO-TN-HM photoanodes were studied comparatively, which suggested that the improved crystallinity, decreased recombination through surface states, and enhanced interfacial Ti 4+ diffusion all contributed to their advanced PEC performance. Our studies confirm that the ER-HTA treatment is an effective method to improve the PEC properties of hematite photoanodes with TiO 2 underlayer and might be applicable for other semiconducting photoelectrodes to get better PEC performance.
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
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IF 4.3
Longzhu Li,Tian Fang,Anqi Huang,Changhai Liu,Lulu Fu,Yuwei Chen,Yujie Ding,Naotoshi Mitsuzaki,Zhidong Chen
Since the photoelectrochemical properties of hematite are affected by its bulk and surface charge recombination, the introduction of a conductive substrate is a feasible way to improve its properties. In this paper, the Ti 3 C 2 and TiO 2 /Ti 3 C 2 conductive substrates were prepared by electrophoretic depositing multilayered Ti 3 C 2 and TiO 2 /Ti 3 C 2 nanosheet powders onto F-doped SnO 2 glass (FTO), respectively. Then, the TiO 2 /Ti 3 C 2 -hematite and Ti 3 C 2 -hematite photoanodes were obtained by in-situ growth of hematite on Ti 3 C 2 and TiO 2 /Ti 3 C 2 conductive substrates by hydrothermal method. The photoanodes were characterized by scanning electron microscopy (SEM), UV–vis spectroscopy, X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and photoelectrical measurements. The photocurrent density of TiO 2 /Ti 3 C 2 -hematite reaches 1.29 mA cm −2 at 1.23 V (vs. RHE), which is 3.7 times than that of the FTO-hematite as 0.35 mA cm −2 . The enhancement of the photocurrent response of TiO 2 /Ti 3 C 2 -hematite is mainly due to the great improvement of the bulk charge separation efficiency and the surface charge injection efficiency. This is attributed to the fact that the layered TiO 2 /Ti 3 C 2 conductive substrate can improve the interface property of FTO/hematite, provide Ti source and a larger specific surface area for the growth of hematite.
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 Materials Chemistry C
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2022
·Vol. 10
·期 38
·14194-14201
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IF 8.067
Lilai Sun,Lu Han,Na Li,Pengbo Wang,Mingyue Wang,Xudong Luo,Xibao Li
Cu2O has begun to show its charm and gain popularity in various photoelectrochemical (PEC) processes, but fast charge recombination and photochemical instability always limit its PEC water splitting activity and stability. Furthermore, H2O wetting on the Cu2O photocathode is the premise for PEC reaction, while research on carrier separation, photostability and still wettability has not been brought to the forefront. Herein, a self-polymerized dopamine coating is employed to directly anchor TiO2 (P25) on the surface of a Cu2O film electrode; nanoscale particles facilitate polydopamine (PDA) conformal assembly on Cu2O polyhedra. A ternary Cu2O/PDA/TiO2 composite photocathode is obtained and shows boosted PEC activity and stability. The advantages of this unique design are mainly reflected in three aspects: (1) the married heterojunction of TiO2/Cu2O provides a persistent driving force for charge separation by PDA natural adhesive properties; (2) the conversion of hydrophobicity–hydrophilicity is achieved to improve the wettability of the Cu2O film electrode assisted by conformal PDA coating; (3) the improvement of PEC stability is due to the inhibition of Cu2O photocorrosion covered by the PDA shelter. This advance bodes well for the development of the PEC field founded on multifunctional PDA.
研究领域:
材料科学
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能源科学
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表面化学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2023
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IF 4.6
Shouli Bai,Shiyu Jia,Yingying Zhao,Pinggui Tang,Yongjun Feng,Ruixian Luo,Dianqing Li,Aifan Chen
Ti-doped α-Fe2O3 nanorods were prepared by a facile hydrothermal method, followed by a NiFe-LDH catalyst that was electrodeposited on the doped α-Fe2O3 nanorods to structure an integrating photoanode Ti:Fe2O3/NiFe-LDH for improving solar PEC water-splitting efficiency. The structure and properties of electrode materials were characterized and the PEC properties of photoanodes were measured. The results show that the photocurrent density of the photoanode enhances 11.25 times at 1.23 V (vs RHE) and the IPCE value enhances 4.10 times at 420 nm compared with pristine α-Fe2O3. The enhancement is attributed to the separating of photogenerated electron–hole, the increase of carrier density, and the acceleration of the carrier transfer rate due to the dual action of doping and catalysis.
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
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Ruikai Wang,Zhichao Hao,Haiyan Li,Chenghui Xia,Bohua Dong,Lixin Cao
Optimizing the interfacial action of photoanode for photoelectrochemical (PEC) behavior to facilitate charge transport is essential for enhancing solar-to-fuel efficiency. Herein, a typical CuWO 4 /NiFe-LDH/Ag photoanode was reported and an alternative pathway for charge transfer in the PEC process through surface states mechanism was elucidated. In particular, the layer double hydroxides (NiFe-LDH) acted as charge-transfer agents to facilitate the transfer of photogenerated carriers; while the surface plasmon resonance (SPR) effect of the Ag provided hot electrons, which increased the carrier concentration and promoted the charge separation. The influence of presence of surface states on the PEC process was systematically illustrated. Experimental results indicated that the optimized CuWO 4 /NiFe-LDH/Ag photoanode displayed a photocurrent that was more than an order of magnitude larger than that of the pure CuWO 4 (increasing from 0.30 mA cm −2 to 1.45 mA cm −2 at 1.23 V vs. RHE), accompanied by favorable electrochemical impedance and stability (maintaining 92.4%). Importantly, increasing the available filled surface states could be beneficial in enhancing the PEC behavior. This work provided additional insights into photoanode charge transport in PEC processes.
研究领域:
材料科学
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能源科学
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光催化
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DOI
高影响因子
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
RSC Advances
·
2019
·Vol. 9
·期 27
·15629-15634
·
IF 3.049
Jie Qi,Dechao Kong,Danyang Liu,Lun Pan,Ying Chen,Xiangwen Zhang,Ji-Jun Zou
Bismuth vanadate photoanode has shown great potential for photoelectrochemical (PEC) catalysis, but it needs to be further modified because of its relatively low charge-separation efficiency and poor stability. Herein, the bimetallic phosphide NiCoP decorated Mo–BiVO4 is fabricated through the electrodeposition and drop-casting method, which significantly improves the charge separation and surface oxidation reaction. Therefore, the fabricated NiCoP/Mo–BiVO4 photoanode exhibits a low onset potential of 0.21 V (vs. RHE) and high photocurrent of 3.21 mA cm−2 at 1.23 V (vs. RHE), which is 3.12 times higher than that of pure BiVO4. Importantly, the decoration of NiCoP significantly improve the stability of BiVO4 photoanode.
研究领域:
材料科学
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电化学
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催化
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产品关联
DOI
PubMed
高影响因子
Science China-Materials
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2022
·Vol. 65
·期 6
·1512-1521
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IF 8.64
Lv Zunyan,Meng Linxing,Cao Fengren,Li Liang
Dull surface oxygen evolution reaction (OER) dynamics seriously hinders the application of BiVO 4 (BVO) photoanodes in photoelectron-chemical (PEC) water splitting. In this study, we built an inorganic/organic hybrid photo-anode to improve the PEC performance of BVO by covering a multifunctional film. The film contains modified chlorophyll (Chl) organic compounds and Co and Si ions with a gradient distribution. The Co ions present at the interface between BVO and Chl promote the transport of photogenerated holes, and the Si ions on the surface of the photoanode enhance the hydrophilicity of PEC cells. This modified Chl film not only reduces the OER barrier and promotes carrier transfer but also inhibits loss of vanadium and increases the stability of the BVO photoanode. Finally, the modified BVO photoanode exhibits a photocurrent density of 5.1 mA cm −2 at 1.23 V RHE (RHE: reversible hydrogen electrode), and the onset potential moves 350 mV negatively in 0.5 mol L −1 Na 2 SO 4 . This article provides a general and simple surface hybrid inorganic/organic solution to improve the catalytic ability of photoanodes.
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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2023
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IF 6.2
Zhibin Qiu,Yumin Li,Xuejun Long,Hong Tian,Yuanmao Pu,Bing Lv,Jun Wei,Qingping Dai,Wenzhong Wang
Cadmium sulfide (CdS), as a prospective photoelectrochemical (PEC) photoanode material, has been restrained in hydrogen production owing to the severe recombination of charge carrier and the inherent photocorrosion. Herein, a thin shell consisted of cuprous sulfide (Cu 2 S) nanoparticles was formed on CdS nanorods arrays to overcome the shortages. An all-sulfide heterojunction not only establishes close interface and p-n junction between two semiconductors, but also possesses additional S atom channel for charge carrier migration, all beneficial for the efficient separation of photogenerated electrons/holes. In consequence, the transient photocurrent density of CdS/Cu 2 S reaches to 4.95 mA/cm 2 under simulated sunlight with zero bias-potential, 1.4-fold of the pristine CdS. The excellent PEC performance results from the type-II band alignment and built-in electric field in heterojunction. Additionally, by the density functional theory, the calculated work function and band structure of CdS/Cu 2 S heterojunction gave strong evidences for the type-II charge transfer mechanism, and the established built-in electric field between p-n junction accelerated transfer and separation of photogenerated charge carriers.
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
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2023
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IF 2.2
Hongye Bai,Lihao Yu,Jinfu Xu,Xuliang Pang,Yajie Bai,Jianguo Cui,Weiqiang Fan
Decoration of metal-organic framework (MOF) has been considered as an effective route to improve the photoelectrochemical (PEC) performance of TiO 2 , but there is still a lack of understanding of the regulatory structure. Herein, Ni-MOF was rationally introduced by in-situ etching method, which helps for artificially regulating the coordination state of Ni sites. The photocurrent density (0.81 mA/cm 2 ) and IPCE value (33.1%) of TiO 2 -MOF-2 are about twice higher than that of pristine TiO 2 due to the rich unsaturated sites of Ni-MOF. Meanwhile, the saturated coordination has caused the decline of PEC performance because of the obvious steric hindrance . Therefore, this work presents an insight for the effect of coordination state on PEC activity especially in MOF system.
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
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