LANGMUIR
·
2022
·
IF 4.331
Chang Xin,Yufei Cheng,Jiawei Wang,Qian Sun,Enzhou Liu,Xiaoyun Hu,Hui Miao
Although interfacial engineering materials for antimony selenide (Sb2Se3) photocathodes have been intensively studied, most of the previous research has focused on the development of photogenerated electron transfer promoters. In this work, Sb2Se3 photocathodes are innovatively modified by using ferrihydrite (Fh), which has been widely used as a hole storage layer in photoanodes. After modifying Fh, the photocurrent density of the Sb2Se3 photocathode was increased from −0.27 to −1.6 mA cm–2 at 0 VRHE with the onset potential positive shift about 150 mV, and an impressive injection efficiency of 83.84% was achieved. The major contribution of Fh to the photoelectrochemical (PEC) performance enhancement was demonstrated by various characterization studies. The results show that the enhancement performance of PEC is largely attributed to the capture of back-migrating holes by Fh, the reduction of interfacial charge transfer resistance, and the significant increase in electrochemical active surface area (ECSA). This work presents new insights into the application of hole storage layers in Sb2Se3-based photocathodes.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2012
·
IF 4.054
Ying Liu,Dong-Ping Wang,Yu-Xiang Yu,Wei-De Zhang
Functional carbon nanotubes (CNTs) were incorporated into Ti-doped Fe 2 O 3 thin films by a facile, one-step co-electrodeposition method. The films were characterized by X-ray diffraction, scanning electron microscopy, UV–visible absorption, and X-ray photoelectron spectroscopy. The introduction of CNTs results in a better absorption in visible region and greatly enhances the photoelectrochemical properties of the Ti–Fe 2 O 3 films. The improved photoelectrochemical properties of the CNTs and Ti co-doped Fe 2 O 3 films are due to the charge equilibration which interplays between the Ti–Fe 2 O 3 and CNTs. The effect of CNTs to mediate fast charge transfer and to retard charge recombination rate in the composites is also demonstrated by kinetics analysis and electrochemical impedance spectroscopy . The influence of different groups-modified CNTs and different content of CNTs was also studied. The highest photocurrent is 4.5 mA/cm 2 at 1.23 V (vs. RHE) obtained by incorporating 0.10 mg/mL amino-group modified CNTs in the Ti–Fe 2 O 3 film. The amino-functionalized CNTs doped film exhibits the highest photoelectric response compared with those doped by the pristine and acid-treated CNTs under the same conditions, which can be ascribed to the better hydrophilicity and dispersibility of the amino-functionalized CNTs.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11108-11116
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IF 2.195
Jiang Xishun,He Wenjun,Zheng Shaokang,Shi Yonghua,Sun Zhaoqi
A series of TiO 2 nanostructures with rutile phase were synthesized on arbitrary substrates of conductive transparent fluorine-doped tin oxide (FTO), tin-doped indium oxide (ITO), and glass at the low temperature of 150 °C by the hydrothermal method. The samples were characterized by XRD, SEM, TEM, XPS, UV–Vis absorption, and micro-Raman spectroscopy. The effects of growth substrates on the morphologies and optical properties of nanostructures were investigated. TiO 2 nanorods were grown on the FTO substrate, while TiO 2 nanoflowers were grown on the ITO and glass substrates, and the growth mechanism for these different nanostructures is discussed in detail. The results show that the TiO 2 nanorods can improve photocatalytic properties and photoelctrochemical (PEC) performance for its unique structure and optical properties. The TiO 2 nanorods exhibited a maximal photocatalytic rate of 4.42 min −1 and photocurrent density of 0.049 mA/cm 2 , which is about 1.52 and 3.03 times higher than those of TiO 2 nanoflowers grown on the ITO substrates, respectively. These findings are quite promising and encouraging for the use of TiO 2 nanoarrays in photocatalysis and energy applications.
研究领域:
材料科学
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纳米技术
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能源应用
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光催化
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Rujing Ban,Zhengyan Xu,Yang Yang,Dayong Fan,Huidan Lu,Yongping Liu
This work synthesized ultrathin 2D CdSe nanosheets by a facile solvothermal method. The morphology, structure, composition, and thermal stability of the samples were studied and analyzed using transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), infrared spectra (IR), and thermogravimetric (TG) methods. Results demonstrated that stable wurtzite-structured CdSe nanosheets with 2-3 nm thickness were successfully fabricated. UV-Vis absorption spectroscopy (UV-Vis) and fluorescence spectroscopy analysis exhibited the characteristic absorption peaks and fluorescence emission peaks of CdSe nanosheets with narrow full-width half-maximums (fwhm) and slight Stokes shift, implying ultrathin structure. Photoelectrochemical (PEC) measurement declared a fast and stable photo-response for the as-prepared CdSe ultrathin nanosheets. With the reaction temperature increasing, the PEC activity enhanced due to the decreased nanosheets thickness. This paper provides a new route for the synthesis of CdSe ultrathin nanosheets and their application in the field of photoelectrochemical catalysis.
研究领域:
材料科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xinru Wang,Qiuxu Chen,Daming Yang,Ying Li,Dongxu Yin,Baoxin Ni,Wei Lu,Guiru Sun,Ming Feng
Photo-assisted electrochemical strategy has garnered interest for its ability to diminish the large overpotential of lithium-oxygen batteries (LOBs). Nonetheless, creating a sophisticated photocatalyst capable of absorbing a wide spectrum of light and dramatically lowering the recombination rate for electron-hole pairs presents a significant challenge. Herein, we design an Ag-doped ZnO (Ag@ZnO) hollow nanosphere as photocatalysts to boost the reaction dynamics of photo-assisted LOBs. The Ag@ZnO hollow nanospheres, featuring a mesoporous structure, are beneficial for improving O 2 transport and enabling the retention of discharge products. Additionally, the ability to absorb light and the efficiencies of electron-hole separation are enhanced for Ag@ZnO as a result of Ag doping. The electrons generated by photoexcitation facilitate the conversion of O 2 to produce Li 2 O 2 during discharge, whereas during charging, the presence of holes causes the decomposition of Li 2 O 2 . Consequently, a significantly low overpotential of 0.22 V, ultrahigh cycling efficiency of 93.73%, and good reversibility was achieved for the photo-assisted LOBs using Ag@ZnO. We consider that this work can offer a reliable strategy to improve electrochemical kinetics and contribute to the development of efficient photocatalysts for photo-assisted LOBs.
研究领域:
材料科学
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能源存储与转换
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 5
·1564-1573
·
IF 6.8
Tian Ze,Wang Zhenxia,Ma Zizai,Li Jinping,Wang Xiaoguang
Photoinduced charge separation and transfer are the core factors affecting the photoelectrochemical performance of BiVO 4 -based photoanodes. Herein, a hole extraction layer was inserted between a BiVO 4 photoanode and an oxygen evolution cocatalyst (OEC). The introduction of Cu 2 O as a hole extraction layer between the OEC layer (FeOOH/NiOOH) and BiVO 4 optimized the migration paths and extended the lifetimes of the photogenerated holes, thus enhancing the photoelectrochemical performance of the photoelectrode. The charge separation efficiency of the optimized BiVO 4 /Cu 2 O/FeOOH/NiOOH photoanode was 92.0% significantly higher than the 70.6% efficiency for pure BiVO 4 . As expected, this photoanode also displayed a high photocurrent density of 3.85 mA cm −2 at 1.23 V RHE (under AM 1.5G illumination), which was 2.77 times greater than that of pure BiVO 4 . Our results indicate that electrodepositing a Cu 2 O hole extraction layer is a simple and scalable method for increasing the photoelectrochemical activity of BiVO 4 photoanodes for solar water splitting.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 162
·期 9
·H638
·
IF 3.266
Wenjun Zhang,Xiaozhe Zhang,Zuxing Zhang,Wanhua Wang,Anjian Xie,Changhe Xiao,Hui Zhang,Yuhua Shen
In this study, a facile strategy for preparing nitrogen-doped carbon dots (N-CDs) was developed. A novel N-CD-sensitized, three-dimensionally ordered, porous TiO2 inverse opal structure (IOS) using a polystyrene (PS) opal as the template was constructed for the first time. The as-prepared N-CDs/TiO2 IOS shows enhanced photoelectrochemical performance and photocatalytic activity. The photo-response range of the composite film is expanded to the visible region due to the addition of N-CDs and the highly ordered void structure. The photocurrent density of the N-CDs/TiO2 IOS is approximately 6 times higher than that of TiO2 IOS and 18 times that of TiO2 nanoparticles (NPs). The photocurrent density is also enhanced 2-fold through sensitization of the N-CDs compared with that of CDs. In addition, the N-CDs/TiO2 IOS shows better photocatalytic activity in degrading organic dyes than CDs/TiO2 IOS, TiO2 IOS and TiO2 NPs. The good photoelectrochemical and photocatalytic performance makes N-CDs/TiO2 IOS a promising material in clean energy, water treatment and other applications.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Lei Ding,Lin Wang,Shuai Chu,Wei Zhai,Jie Li,Xiaoru Li,Zhengbo Jiao
Environmental issues, such as increasingly polluted water resources and energy shortages, have led to the need for new strategies to promote sustainable progress and enhance human well-being. Photocatalysis is widely recognized as a promising technology for environmental sustainability. MXene is a two-dimensional nanotransition metal material, which has attracted extensive attention in the field of photocatalysis. In MXenes, titanium carbide (Ti3C2) has been extensively studied for its application in photocatalysis due to its unique nanolayered structure. The Ti site on the surface of Ti3C2 has a stronger redox activity than traditional C materials, and Ti3C2 has high electrical conductivity. The focus of this study is to obtain the Ti3C2/TiO2 composite by in situ calcination of Ti3C2 and then combine Mo,W:BVO with TiO2 to form feasible heterojunctions. The excellent electrical conductivity of Ti3C2 promotes the transfer of electrons and holes between Mo,W:BVO and TiO2, thus establishing a cascade that minimizes charge carrier recombination and exhibits strong photocatalytic activity. Through a series of photocatalytic tests, the optimum calcination temperature and time of Ti3C2 (550 °C, 2.5 h) and the doping amount of Ti3C2 (2 mg/mL) were determined. Under these conditions, a high current density of 3.8 mA cm–2 was obtained, showing excellent photostability. This study confirmed the strong photocatalytic activity of the synthesized nanoscale composites Mo,W:BVO/TiO2/Ti3C2, providing valuable insights for the design of efficient and sustainable photocatalysts in the future.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 10
·5966-5975
·
IF 3.094
Haocheng Yang,Jinjun Chen,Yong Zuo,Miao Zhang,Gang He,Zhaoqi Sun
In this study, TiO 2 nanorod arrays (TNR), Ag quantum dots (QDs) sensitized with TNR TiO 2 /Ag, bismuth oxyhalide (BiOI) nanosheets, and Ag QDs co-modified with TNR and TiO 2 /BiOI/Ag (TBA) were prepared by a stepwise process. The morphological, structural, compositional, optical, photocatalytic (PC), and photoelectrochemical (PEC) properties of the samples were investigated. The TBA-2 sample exhibited the highest photocurrent density (281.8 μA/cm 2 ) and photodegradation efficiency (93.3%), with values 9.7 times and 2.25 times higher than those for TNR, respectively. The improvement in sample performance can be attributed to the formation of a heterojunction between BiOI and TiO 2 , thereby enhancing the absorption of visible light and improving the charge separation efficiency; Ag QDs limit interfacial electron-hole pair recombination. The experimental results show that TBA can effectively promote light-induced carrier transport and visible light absorption, while inhibiting the recombination rate of the electron-hole pairs, PEC, and PC.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 6
·4114-4120
·
IF 3.201
Jiajia Li,Xiuxun Han,Min Wang,Yun Zhao,Chen Dong
Highly active and durable hydrogen evolution reaction (HER) catalysts are required for the low-cost and high-yield generation of clean energy from water splitting. Herein, a Cu3BiS3/TiO2 (C@T) heterojunction film is constructed by a facile dip-coating method for the synthesis of Cu3BiS3 nanorods on a TiO2 film. The heterojunction film is used as a catalyst in water splitting which exhibits a higher photoelectrochemical (PEC) performance and electrocatalytic activity than the respective pure Cu3BiS3 nanorods counterpart. Experimental results confirm that the PEC performance of the C@T heterojunction film displays a strong photoresponse of as high as ∼1.5 × 10−4 A cm−2 at an applied potential of −0.5 V vs. Ag/AgCl under visible light irradiation. What's more, the as-prepared C@T film shows the best electrocatalytic performance with an onset overpotential of 150 mV, a low Tafel slope of 42.67 mV dec−1, a large current density of 10.8 mA cm−2 at an overpotential of 220 mV, and a remarkable cycling stability. The enhanced PEC performance is associated with the formation of a heterojunction structure at the interface between TiO2 and Cu3BiS3, which facilitates light absorption and separation of photogenerated charge carriers. The growth of Cu3BiS3 nanorods on a TiO2 film modified the electronic structure and increased the electrochemical area, and thus is responsible for enhanced catalytic activity. Benefitting from its scalable preparation and properties, the Cu3BiS3 nanorods/TiO2 heterojunction film is indeed a promising catalyst for hydrogen evolution reaction.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Sainan Zhang,Ying Liu,Min Feng,Bowen Zhang,Tongtong Yu,Shiwei Xu,Guoyun Sun,Daoai Wang
In this study, a new photoelectrochemical material is fabricated by loading two-dimensional leaf-like Ti 3 C 2 MXene nanosheets into the TiO 2 nanorod array to form Ti 3 C 2 nanosheets/TiO 2 nanorod (Ti 3 C 2 /TiO 2 NR) composite photoanode materials. The unique two-dimensional/one-dimensional (2D/1D) composite photocatalytic materials enhance the photoelectrochemical water splitting performance under simulated solar light (100 mW cm −2 ) and yield a high photocurrent density of 1.41 mA cm −2 at 1.23 V vs . reversible hydrogen electrode (V vs. RHE ) and photoconversion efficiency of 0.46% at 0.78 V vs. RHE , which are almost 3.13 and 5.82 times higher, respectively, than those of the pure rutile TiO 2 NRs. The enhanced photoelectrochemical performances are attributed to the photogenerated electrons produced by TiO 2 NR which could be quickly transported by Ti 3 C 2 nanosheets due to their good electrical conductivity and increased specific surface area, which improve the separation efficiency of electrons and holes. These Ti 3 C 2 /TiO 2 NR, as new photocatalytic materials, have promising potential applications in the fields of photoelectrochemical water splitting, solar cells, and other photocatalytic devices.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Lin Tang,Yaocheng Deng,Guangming Zeng,Wei Hu,Jiajia Wang,Yaoyu Zhou,Jingjing Wang,Jing Tang,Wei Fang
This paper described a facile method for the design and utilization of three-dimensional TiO 2 branched nanorod arrays with CdS and Cu 2 S quantum dots co-sensitized photoelectrode for photoelectrochemical water splitting . CdS and Cu 2 S quantum dots were attached on the surface of TiO 2 BNRs by successive ionic layer adsorption and reaction (SILAR). The morphology and element composition of the fabricated samples were characterized by field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and the optical features were measured by UV–vis diffuse reflection spectroscopy (UV–vis DRS) and photocurrent density–voltage (I–V) curves. The photocurrent value can be significantly enhanced due to the introduction of CdS and Cu 2 S quantum dots on the TiO 2 BNRs surface. The 9 cycles of CdS and 6 cycles of Cu 2 S presented the best performance and reached a high photocurrent density to 13.65 mA at 0 V versus Ag/AgCl and hydrogen generation efficiency of 7.74% at −0.467 V versus Ag/AgCl. This enhancement can be attributed to the improved light absorption and the heterojunction formed between CdS and Cu 2 S, which can greatly promote the introduction and transportation of the photo electrons. This work provided a facile way for the synthesis of high performance photoelectrode for photoelectrochemical water splitting.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 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）