INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Qizhao Wang,Guoxia Yun,Yan Bai,Ning An,Yutao Chen,Rongfang Wang,Ziqiang Lei,Wenfeng Shangguan
TiO 2 photocatalysts loaded CuS and NiS as co-catalyst were prepared by hydrothermal approach and characterized by XRD , UV–visible DRS , BET, XPS, SEM and TEM. When TiO 2 was loaded MS as co-catalyst, it showed higher photocatalytic activities for splitting water into hydrogen in methanol aqueous solution under 500 W Xe lamp. Among the photocatalysts with various compositions , the maximum evolution of H 2 obtained from 5 wt% CuS – 5 wt% NiS – TiO 2 sample was about 800 μmol h −1 , which was increased up to about twenty-eight times than that of TiO 2 alone. It was proven that CuS, NiS can act as effective dual co-catalysts to enhance the photocatalytic H 2 production activity of TiO 2 .
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
Catalysts
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2019
·Vol. 9
·期 7
·596
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IF 3.444
Ying Liu,Huan Zhang,Cong Ma,Nan Sun
Precious metal-free NiMoM (M = Pr2O3, Cu2O) catalysts have been synthesized through a simple coreduction method, without any surfactant or support material, and characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The resultant Pr2O3- or Cu2O-modified NiMo catalysts exhibit different structures, which is due to a difference in the synergistic effects of NiMo and the modifying elements. NiMoPr2O3has an amorphous structure, with low crystallinity and uniform particle dispersion, while NiMo@Cu2O adopts the core–shell structure, where the core and shell are synergistic with each other to promote electron transfer efficiency. The support material-free nanocatalysts Ni9Mo1(Pr2O3)0.375and Ni4Mo@Cu2O are both highly efficient compared with bimetallic NiMo catalysts, in terms of hydrogen generation from hydrous hydrazine (N2H4·H2O) at 343 K, with total turnover frequencies (TOFs) of 62 h−1and 71.4 h−1, respectively. Their corresponding activation energies (Ea) were determined to be 43.24 kJ mol−1and 46.47 kJ mol−1, respectively. This is the first report on the use of Pr-modified NiMo and core–shell NiMo@Cu2O catalysts, and these results may be used to promote the effective application of noble metal-free nanocatalysts for hydrogen production from hydrous hydrazine.Keywords:NiMoM (M = Pr2O3, Cu2O) catalysts;hydrous hydrazine;hydrogen production
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 11
·4520
·
IF 4.6
Xiangrui Feng,Hongji Chen,Hongfei Yin,Chunyu Yuan,Huijun Lv,Qian Fei,Yujin Zhang,Qiuyu Zhao,Mengmeng Zheng,Yongzheng Zhang
ZnIn2S4(ZIS) is widely used in the field of photocatalytic hydrogen production due to its unique photoelectric properties. Nonetheless, the photocatalytic performance of ZIS usually faces problems of poor conductivity and rapid recombination of charge carriers. Heteroatom doping is often regarded as one of the effective strategies for improving the catalytic activity of photocatalysts. Herein, phosphorus (P)-doped ZIS was prepared by hydrothermal method, whose photocatalytic hydrogen production performance and energy band structure were fully studied. The band gap of P-doped ZIS is about 2.51 eV, which is slightly smaller than that of pure ZIS. Moreover, due to the upward shift of its energy band, the reduction ability of P-doped ZIS is enhanced, and P-doped ZIS also exhibits stronger catalytic activity than pure ZIS. The optimized P-doped ZIS exhibits a hydrogen production rate of 1566.6 μmol g−1h−1, which is 3.8 times that of the pristine ZIS (411.1 μmol g−1h−1). This work provides a broad platform for the design and synthesis of phosphorus-doped sulfide-based photocatalysts for hydrogen evolution.Keywords:ZnIn2S4;phosphorus doping;photocatalytic;hydrogen generation
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Ligang Ma,Chao Lin,Wenjun Jiang,Le Xu,Yujie Shao,Tianyu Zhu,Ting Zhao,Xiaoqian Ai,Xiaoshan Wu
In the face of energy scarcity and environmental degradation, photocatalysis emerges as a green and highly efficient method to convert solar energy into a renewable energy source . In this study, CdS nanoparticles were successfully grown in situ along the edges of ZnIn 2 S 4 nanosheets using ultrasound during the synthesis process and the second phase precipitation of In(OH) 3 appeared in the process of preparation. Optimal Cd and S ratios resulted in ZnIn 2 S 4 @In(OH) 3 @CdS heterojunction exhibiting remarkable photocatalytic H 2 production performance compared to standalone ZnIn 2 S 4 and CdS. The internal heterojunction interface within the composite naturally generates an electric field, enhancing carrier separation and facilitating their transport. Additionally, the inclusion of In(OH) 3 further expedites carrier extraction. Ultimately, the mechanism behind the photocatalytic H 2 production was elucidated using the Z-scheme mechanism. This work introduced a novel approach to fabricating multifunctional photocatalysts , presenting a fresh perspective in their design and preparation.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2017
·Vol. 19
·期 38
·25919-25926
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IF 4.123
Junwen Peng,Junli Xu,Zhaoyu Wang,Zhengxin Ding,Sibo Wang
Developing efficient alternatives to the widely used Pt cocatalyst in photocatalytic H2O splitting is of great importance in view of large-scale production of clear H2 energy. Herein, we report the facile synthesis of NiCo2S4 and its first use as a highly active and cost-affordable cocatalyst to boost visible light H2 generation with the CdS semiconductor. The synthesized NiCo2S4/CdS composite materials are fully characterized by various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis diffusion reflectance spectroscopy (DRS), and N2 adsorption measurements. With the optimized NiCo2S4/CdS composite sample, a high H2 generation rate of 137 μmol h−1 is obtained under visible light irradiation, which is more than 17 times higher than that of bare CdS material. The results of photoluminescence (PL) spectroscopy, transient photocurrent response and electrochemical impedance spectroscopy demonstrate the remarkably promoted migration and separation of photogenerated charge carriers over the heterostructured NiCo2S4/CdS material, thus leading to obviously enhanced photocatalytic performance. Moreover, a possible mechanism for the photocatalytic H2 evolution reaction is also proposed based on the observed results of activity evaluation and photoelectrochemical measurements.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Kai Wu,Renqian Jiang,Yulong Zhao,Liang Mao,Xiuquan Gu,Xiaoyan Cai,Mingshan Zhu
Exploring low-cost co-catalyst to ameliorate the photocatalytic activity of semiconductors sets a clear direction for solving energy crisis and achieving efficient solar-chemical energy conversion. In this work, a unique hierarchical hollow heterojunction was constructed by in-situ growing ZnIn 2 S 4 nanosheets on the porous NiCo 2 S 4 hollow prisms through a low temperature solvothermal method, in which NiCo 2 S 4 with semi-metal property acted as non-noble metal co-catalyst. NiCo 2 S 4 co-catalyst was innovatively encapsulated in ZnIn 2 S 4 , which not only relieved the light shielding effect caused by the large loading amount of co-catalyst, but also supplied abundant active sites for H 2 evolution. The hierarchical hollow heterostructure of NiCo 2 S 4 /ZnIn 2 S 4 provided a highly efficient channel for charge transfer. Combining these advantages, NiCo 2 S 4 /ZnIn 2 S 4 composite demonstrated excellent photocatalytic activity. In the absence of sacrificial agent, the NiCo 2 S 4 /ZnIn 2 S 4 photocatalyst achieved a remarkable improved H 2 yield of 0.77 mmol g − 1 h −1 under visible light irradiation (λ > 400 nm), which is 6.6 times greater than that of ZnIn 2 S 4 . Besides, NiCo 2 S 4 even exhibited better performance on the H 2 evolution improvement of ZnIn 2 S 4 than precious metal Pt. This work will offer novel insights into the reasonable design of non-noble metal photocatalysts with respectable activity for water splitting.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Jian Yu,Si-Liang Lei,Tong-Cai Chen,Jian Lan,Jian-Ping Zou,Lin-Hua Xin,Sheng-Lian Luo,Chak-Tong Au
A new strategy has been put forward to improve the performance of photocatalytic H 2 evolution of tantalate-based catalysts through designing solid solutions Bi 1− x In x TaO 4 combined with CdS, among which the solid solutions Bi 1− x In x TaO 4 ( x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0) were firstly synthesized by the citrate method using cheap and environment-friendly Ta 2 O 5 . The experimental results reveal that the Bi 0.5 In 0.5 TaO 4 solid solution shows the best photocatalytic performance among the Bi 1− x In x TaO 4 solid solutions. And in the absence of noble metals, the 30% CdS/Bi 0.5 In 0.5 TaO 4 (30CBITO) catalyst exhibits good photocatalytic hydrogen evolution from water splitting with a rate of H 2 production of 511.75 μmol h −1 g −1 under simulated sunlight irradiation. And the rate of hydrogen evolution does not markedly change for 60 h. Their compositions , structures and morphologies were characterized by UV–vis diffusion reflectance spectroscopy (DRS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). A photocatalytic enhancement mechanism was put forward to elucidate the superior photocatalytic activity and long-term stability of the heterostructured CdS/Bi 0.5 In 0.5 TaO 4 composites.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 6
·期 3
·714-723
·
IF 4.446
Haoyang Tian,Jintao Liang,Xuli Ma,Lele Cao,Xueyan Hu,Mengting Gao,Huimin Yang,Zhenhai Liang
Graphical Photo finish : A catalyst made of MoS 2 nanosheets loaded on Cu-doped CdS nanorods is synthesized through a facile two-step solvothermal approach. The working electrode is formed by loading a certain amount of catalyst on fluorine tin oxide. A significant increase in the photoelectrochemical performance is observed, owing to the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer from the Cu 2+ doping. Transition-metal ion doping and efficient decoration by using a co-catalyst have been proven to effectively inhibit the recombination of photogenerated electron-hole pairs and broaden the visible-light response region. Here, we have constructed MoS 2 nanosheets decorated on a copper-doped CdS nanorod composite as a noble-metal-free photoelectrocatalyst. This kind of composite material was constructed through a simple solvothermal method. The morphology, structure, chemical states, photoelectrochemical properties, and other properties were tested by using a diverse range of analytical techniques. Owing to the Cu 2+ doping and the excellent electron-capturing ability of MoS 2 , 5 % MoS 2 /Cu−CdS (with 7 % Cu 2+ doping in CdS) exhibits excellent hydrogen evolution reaction with a rate of 10.18 mmol h −1 g −1 , which is about 48 times higher than that of pure CdS. A significant increase in the photoelectrochemical performance of the composite catalytic material benefits from the synergistic effect between CdS and MoS 2 and fast interfacial charge transfer, owing to the Cu 2+ doping. These findings provide a new thought for further research of the ion doping in photoelectrocatalytic field.
研究领域:
材料科学
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能源化学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Shuang Liang,Guanting He,Guozhe Sui,Jinlong Li,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Chao Wang,Zhiyong Xing
Metal organic frameworks (MOFs) are considered as desirable precursors for the preparation of photocatalyst to improve photocatalytic hydrogen evolution efficiency due to the maintained special morphology. Herein, C-doped rod-like ZnO with porous structure has been successfully prepared by using ZIF-L as precursor via an optimized two-step calcination strategy, which is applied for photocatalytic hydrogen evolution reaction from water splitting. The results show that ZnO-350-450 exhibits the best photocatalytic activity with a hydrogen production rate of 0.35 mmol·g −1 ·h −1 , which is 1.9 times higher than that of ZnO-400 (0.184 mmol·g −1 ·h −1 ) under simulated sunlight illumination. The enhanced photocatalytic performance is attributed to the fact that the two-step calcination provides the regular porous rod-like structure (ZIF-L) and the inclusion of carbon in ZnO photocatalyst. C-doped ZnO with regular morphology offers faster charge transfer rate and higher charge separation efficiency, and the C-doped expands a wider range of light absorption. Overall, the presented work could provide a new idea for designing and preparing of photocatalysts with high efficiency for photocatalytic hydrogen production.
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 C
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2023
·Vol. 11
·期 35
·11960-11968
·
IF 6.4
Yin Huang,Guangzheng Xu,Xiaoyu Huang,Hao Wu,Xiuhua Wang
For hydrogen evolution via overall water splitting, conveniently linked hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts are greatly sought. Thus, a three-step growth-conversion approach is used to create a particular type of Co2V2O6·2H2O/ZIF-L@MXene/NF in order to create a bifunctional water splitting catalyst. The strong coupling between Co2V2O6·2H2O/ZIF-L as a precursor to produce OER active species and a MXene that promotes mass/charge transfer greatly improves the performance of the catalyst. The as-prepared Co2V2O6·2H2O/ZIF-L@MXene/NF exhibits a low OER overpotential of 224 mV@50 mA cm−2, an HER overpotential of 98 mV@10 mA cm−2, and an overall water splitting overpotential of 1.478 mV@10 mA cm−2. To accomplish total water splitting, the electrolyser can also be powered by a solar cell (1.5 V). This research will help to create non-noble metal-based electrocatalysts that are effective and economical.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Meng-yuan Ding,Juan Wang
Photocatalytic hydrogen production is of great significance for the transformation of energy system . To improve the hydrogen production performance, nano-photocatalysts including pure TiO 2 and NiO-TiO 2 were prepared by sol-gel method in this paper. To unravel reaction intermediates and pathways, the adsorption experiments and photocatalytic reaction of ethanol over the photocatalysts were carried out in combination with in situ DRIFTS technique, and the main products in the photocatalytic process were detected through gas chromatography . The results showed that 2NiO-TiO 2 as the optimum photocatalyst can yield the maximum H 2 rate at 20.10 mmol g −1 h −1 . For the adsorption of ethanol on TiO 2 and 2NiO-TiO 2 , the molecular form of ethanol is more dominant than the dissociated form, and CH 3 CH 2 OTi is more easily generated on 2NiO-TiO 2 than pure TiO 2 . The hydrogen production pathway changes by doping with NiO, reducing the production of acetic acid and aldehydes and producing the important intermediate CH 2 CHOTi.
研究领域:
能源科学
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催化化学
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产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
G. Wei,F. Niu,Z. Wang,X. Liu,S. Feng,K. Hu,X. Gong,J. Hua
Polymer heterojunctions have emerged as promising photocatalysts for the photocatalytic hydrogen evolution . However, they are usually used in the form of suspended powder due to the low solubility and lack of anchoring groups to hybridize with inorganic semiconductor oxides . Yet polymer film heterojunctions with convenient separation and recycling potential are more suitable for large-scale water splitting. Herein, a new solution-processable polymer PDBCOOH with biphenyl as the electron donor and diketopyrrolopyrrole (DPP) containing carboxyl group as the electron acceptor has been designed and synthesized. Surface anchoring of PDBCOOH to TiO 2 films through covalent bonding formed polymer-TiO 2 film heterojunctions that achieved a recorded photocatalytic H 2 production rate of 11.9 mmol/m 2 /h without Pt co-catalyst and was 88.8 times higher than that of pristine TiO 2 film. Transient absorption spectroscopy confirms ultrafast polymer excited state electron injection into TiO 2 , long-lived charge separated state, and unity yield of polymer hole regeneration. Photoelectrochemical experiments combined with density functional theory calculation further demonstrate that polymer PDBCOOH /TiO 2 film heterojunctions not only accelerate the charge transfer but also significantly improve the hydrogen evolution rate and stability of the photocatalysts. This work offers a new strategy for obtaining stable and efficient photocatalysts by using the covalent anchoring strategy of polymer/TiO 2 film heterojunction.
研究领域:
材料科学
·
光催化
·
能量转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）