CATALYSIS COMMUNICATIONS
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2016
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IF 3.389
Yuyao Huang,Kunyang Wang,Liang Cui,Wenxin Zhu,Abdullah M. Asiri,Xuping Sun
Hydrogen storage, distribution and controlled release are of important concerns for hydrogen based economy. Sodium borohydride (NaBH 4 ) is one of the mostly studied chemical hydrides used for hydrogen storage and generation. However, it requires efficient catalysts to accelerate its dehydrogenation for controllable hydrogen production . In this paper, we demonstrate that the dehydrogenation of NaBH 4 in alkaline solutions can be driven by self-supported cobalt oxide nanorod array on Ti sheet (Co 3 O 4 NA/Ti). Such Co 3 O 4 NA/Ti shows high catalytic performance with a maximum hydrogen generation rate of 1940 mL/min/g Co3O4 and an activation energy of 59.84 kJ/mol under ambient condition. Moreover, this catalyst exhibits no mass or activity loss even after 5 cycles with an obvious advantage of easy separation from the fuel solution. This development offers us a cost-effective and recyclable catalytic material toward hydrolytic hydrogen production for applications.
研究领域:
材料科学
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化学工程
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能源技术
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 72
·45369-45376
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IF 3.108
Ke Xu,Jian Feng
New types of LaFeO3/g-C3N4 heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities under visible light irradiation were determined. They possessed the features of a Z-scheme photocatalysis system. The photoexcited electrons on the conduction band of LaFeO3 were transferred to the valence band of g-C3N4 by the solid–solid intimately contacted interfaces, where the electrons and holes were recombined, and thus improved the separation of photogenerated electrons and holes of g-C3N4. The LaFeO3/g-C3N4 heterostructures showed a higher hydrogen evolution rate and a higher amount of ˙OH than pure LaFeO3 and g-C3N4. The construction of the LaFeO3/g-C3N4 heterostructures was used to demonstrate an effective strategy for improving the photocatalytic property. The 5%-LaFeO3/g-C3N4 exhibited the highest photodegradation and water splitting rate. More than 95% of methylene blue (MB) was degraded after 15 min in the presence of 25 mg EDTA-2Na in 100 mL MB solution which was irradiated using a 3 W light-emitting diode. The 5%-LaFeO3/g-C3N4 heterojunction nanocomposite had a maximum hydrogen evolution rate of 158 μmol g−1 h−1.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Kexin Liu,Shilong Yang,Yi Chen,Wenlei Zhang,Pu Liu,Xiucheng Zheng
The hydrolysis of ammonia borane (NH 3 BH 3 , AB) is an efficient strategy for high-purify hydrogen evolution . However, it is indispensable to develop a suitable catalyst because this reaction is kinetically infeasible at room temperature . In this work, we prepared a series of nano hexagonal boron nitride (h-BN) supported CuNi bimetallic catalysts through a facile adsorption-chemical reduction procedure. The effects of various molar ratios of Cu to Ni and CuNi loadings on AB hydrolysis were investigated in details. Benefitting from the proper porous structure , the interesting alloy effect of Cu and Ni, as well as the synergistic effect between h-BN and CuNi, 20 wt% Cu 0.5 Ni 0.5 /h-BN displays the highest catalytic activity among the as-prepared catalysts. Apart from satisfactory durability, the corresponding hydrogen generation rate, turnover frequency at 303 K in base solution and apparent activation energy are 2437.0 mL g −1 min −1 , 6.33 min −1 and 23.02 kJ mol −1 , respectively, which are very outstanding compared with many previous results. Our work not only provides a proper non-precious metal catalyst for hydrogen generation from the hydrolysis of chemical hydrogen storage materials but also offers a facile strategy for synthesizing metallic functional materials .
研究领域:
催化材料
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能源化学
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DOI
高影响因子
Nanoscale
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2020
·Vol. 13
·期 2
·901-911
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IF 6.895
Xueqing Shao,Feng Xiao,Xueying Zhao,Zhiyan Hou,Fan Yue,Lu Wang,Ronglan Wu,Jide Wang,Xintai Su,Chao Yang
Photocatalytic hydrogen production from water is a promising method to obtain clean energy in the future. In this work, the sulfated TiO2 photocatalyst is successfully constructed in situ via a soft-templated method for photocatalytic water splitting to produce hydrogen. The content of sulfate species in TiO2 can be tuned by changing the amount of the surfactant. The photocatalyst with the appropriate content of sulfate ions exhibits an apparent quantum efficiency (AQE) of 3.9% at 365 nm and a high hydrogen production rate of 24.32 mmol h−1 g−1, which is 1.65 times that of commercial TiO2 (P25). The optimized photocatalyst has excellent photocatalytic activity for hydrogen evolution benefitting from the presence of sulfate ions on the surface of TiO2, large surface area and oxygen vacancies, which facilitates the rapid migration of photo-generated electrons to its surface and the improvement of the separation efficiency of photo-generated carriers. This work may inspire the rational design and the development of high-efficiency photocatalysts.
研究领域:
材料科学
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能源科学
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催化
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纳米技术
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Jiajia Feng,Dingke Zhang,Hongpeng Zhou,Mingyu Pi,Xiaodeng Wang,Shijian Chen
Fabricating heterostructures to promote the charge separation and doping heteroatom to modulate the band gap of the photocatalysts have been regarded as effective strategies to improve the photocatalytic performance. However, it is still an unresolved issue of doping element and fabricating heterostructures with good contact at the same time. In this study, P nanostructures/P doped graphitic carbon nitride composites (P@P-g-C3N4) were successfully composited by a solid reaction route. Various structural characterizations, including X-ray adsorption near edge structure, indicate that P has been doped into g-C3N4 and P nanostructures were directly grown on g-C3N4 to form heterostructures. As expected, the intimate contacted heterostructured composites exhibit much enhanced light absorption and high-efficiency transfer and separation of photogenerated electron–hole pairs, and consequently, the composites also possess the superior photocatalytic performance in the rapidly degrading RhB and an efficient H2 production rate of 941.80 μmolh–1g–1. Systematical studies combining experimental measurements with theoretical calculations were carried out to expound the underlying reasons behind the distinct performance. This study pave a one-step way to synthesize earth abundant element C, N, and P as novel photocatalysts for photochemical applications.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Jianjian Yi,Guoxiang Zhang,Xiangyang Cao,Xianglin Zhu,Li Li,Xuyu Wang,Xingwang Zhu,Yanhua Song,Hui Xu,Xiaozhi Wang
The improvement of surface reactivity in noble-metal-free cocatalysts is crucial for the development of efficient and cost-effective photocatalytic systems. However, the influence of crystallinity on catalytic efficacy has received limited attention. Herein, we report the utilization of structurally disordered MoSe 2 with abundant 1T phase as a versatile cocatalyst for photocatalytic hydrogen evolution. Using MoSe 2 /carbon nitride (CN) hybrids as a case study, it is demonstrated that amorphous MoSe 2 significantly enhances the hydrogen evolution rate of CN, achieving up to 11.37 μmol h −1 , surpassing both low crystallinity (8.24 μmol h −1 ) and high crystallinity MoSe 2 (3.86 μmol h −1 ). Experimental analysis indicates that the disordered structure of amorphous MoSe 2 , characterized by coordination-unsaturated surface sites and a rich 1T phase with abundant active sites at the basal plane, predominantly facilitates the conversion of surface-bound protons to hydrogen. Conversely, the heightened charge transfer capacity of the highly crystalline counterpart plays a minor role in enhancing practical catalytic performance. This approach is applicable for enhancing the photocatalytic hydrogen evolution performance of various semiconducting photocatalysts, including CdS, TiO 2 , and ZnIn 2 S 4 , thereby offering novel insights into the advancement of high-performance non-precious catalysts through phase engineering.
研究领域:
材料科学
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催化
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光催化
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能源材料
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产品关联
DOI
PubMed
高影响因子
Nanoscale
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2023
·Vol. 15
·期 39
·16131-16143
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IF 6.7
Jingzhi Wang,Mei Li,Zhiliang Jin
Dynamics and morphology play a crucial role in the field of photocatalytic hydrogen production. Regulating the transfer of photogenerated charges is an effective way to improve the catalytic activity. In this paper, 1T-WS2 is introduced into a p–n heterostructure, ZnCdS/NiV-LDH, as a metalloid electron pump to transfer photogenerated electrons from semiconductors with larger work functions to metalloid materials with smaller work functions, effectively to attract photogenerated electrons, and promote charge rearrangement at the p–n heterostructure interface, so as to achieve the best utilization efficiency of photogenerated charges. Second, adjusting the morphology to increase the light absorption area of the catalyst is also a way to improve the photocatalytic activity. Two different nanosheet structures dispersed heavily stacked ZnCdS, increasing the light absorption area of the system. The optimal catalyst ratio achieves a hydrogen evolution rate of 22.37 mmol g−1 h−1, achieving 7.98% AQE and 2.12% STH conversion efficiency at 450 nm. The potential mechanism was demonstrated through in situ XPS. This study provides new insights into adding “electron pumps” to heterostructures to enhance photocatalytic activity.
研究领域:
材料科学
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催化
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纳米技术
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光化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Lufang Fan,Jiahui Han,Kai Wei,Changchang Ma,Sheng Feng,Yun Zhou,Xiaojun Dai,Zhiwei Ye,Yang Wang
This study aimed to regulate the band structure and enhance the reduction ability of CdS by substituting it with Mn 2+ . Subsequently, this nano MnCdS solid solution was anchored on the surface of truncated octahedral Cu 2 O through a simple hydrothermal process, forming an S-scheme heterojunction at the interface between MnCdS and Cu 2 O. Equilibrating the Fermi level at the MnCdS/Cu 2 O heterojunction led to spontaneous diffusion of electrons in MnCdS to Cu 2 O, generating an internal electric field that drove the recombination of electrons in the conduction band (CB) of Cu 2 O and holes in the valence band (VB) of MnCdS. Consequently, this process preserved the powerful photogenerated electrons in the CB of MnCdS, facilitating robust photocatalytic hydrogen evolution . The MnCdS/Cu 2 O exhibited a photocatalytic hydrogen evolution rate of 66.3 mmol g −1 h −1 , which was 3.4- and 54.3-times higher than that of MnCdS (19.4 mmol g −1 h −1 ) and Cu 2 O (1.2 mmol g −1 h −1 ), respectively. This study elucidates advanced S-scheme heterojunction catalyst architectures for photocatalytic hydrogen production.
研究领域:
材料科学
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化学
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光催化
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能源转换
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Dawei Lu,Wen Meng,Xiaowei Wen,Feng Li,Taohai Li
Herein, an Ag/Ni(dmgH) 2 photocatalyst was constructed through a controllable silver modification strategy. The combination of the local surface plasmon resonance (LSPR) effect of Ag nanoparticles and the synergistic catalytic effect of Schottky junctions significantly enhanced photogenerated carrier separation. Under optimized conditions, the Ag/Ni(dmgH) 2 system achieved a remarkable hydrogen evolution rate of 922.2 μmol/g/h under visible light, approximately 16.7 times higher than the unmodified system. Furthermore, the Ag/Ni(dmgH) 2 film fabricated via screen-printing technology effectively utilized enhanced light absorption from LSPR and efficient interfacial electron transport from Schottky junctions, achieving degradation rates of 98.9 % for Rhodamine B and 86.9 % for Quinoline Blue. The film retained 86.9 % of its activity after four cycles, demonstrating excellent recyclability. This work highlights the dual application potential of Ni(dmgH) 2 materials for photocatalytic energy conversion and environmental remediation.
研究领域:
材料科学
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纳米技术
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环境科学
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能量转换
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Ping Bai,Peng Wang,Tong Li,Jianfang Jing,Yiguo Su
Improving the charge separation and migration in graphitic carbon nitride (CN) is the critical issue to enhance its photocatalytic performance, but still remains very challenging. Herein, the alkali metals were introduced into the interlayer and intralayer of CN to tackle this challenge. The lithium sodium-modifying carbon nitride layer (LiNaCN2) and the adjacent CN layer formed a van der Waals heterostructures (VDWHs), while the potassium-intercalating served as interlayer charge transfer channels to induce the directional charge flow. Experiments and theoretical calculations indicated that such unique construction provided intrinsic driving force to obtain the electrons from LiNaCN2 to CN via directional potassium channels. In accordance with the theoretical prediction, a dramatically red-shift of the light absorption feature was achieved for interlayer potassium-intercalating and intralayer lithium sodium-modifying co-functionalized carbon nitride (LiNaCN-K-CN2) to show narrowed bandgap energy of 2.15 eV. This directional charge flow in CN resulted in the rapid transfer of charge carriers in both interlayer as well as intralayer of CN, which reduced the electronic localization as well as extended the π conjugative effect. Consequently, the LiNaCN-K-CN2 displayed stable and remarkable hydrogen production rate of about 2.46 mmol g −1 h −1 with apparent quantum yield (AQY) of about 13.68% at 435 nm, which was 22 folds higher than that of the pristine CN. This finding provides the feasible strategy to precisely tune the directions of charge transfer for high-performance CN-based photocatalysts.
研究领域:
材料科学
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化学
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光催化
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能源材料
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Lanlan Zhang,Qi Wang,Yuanhu Lei,Xixi Yin,Bing Lv,Qingping Dai,Yangfang Liao,Xiaolu Wang
This study fabricated a type-II heterojunction photoanode system via a two-step synthesis strategy, constructing ZnO/CeO 2 nanotube arrays (NTAs) heterostructures by using zinc oxide NTAs as the substrate with surface-loaded cerium dioxide quantum dots (QDs). Firstly, one-dimensional ZnO nanorod arrays (NRAs) structures were prepared via electrochemical deposition, followed by etching in an alkaline solution to fabricate ZnO NTAs. Subsequently, CeO 2 QDs were synthesized using a precipitation method and loaded onto the surface of ZnO NTAs through spin-coating, successfully fabricating ZnO/CeO 2 heterostructures. The ZnO/CeO 2 heterojunction exhibits a photocurrent density of 35 μA cm −2 in neutral electrolyte under zero bias,1.75 times that of pristine ZnO NTAs. Its hydrogen evolution rate increases from 9.9 μmol h −1 cm −2 to 12.8 μmol h −1 cm −2 , demonstrating enhanced photoelectrochemical performance. The enhancement mechanism of photoelectrochemical performance was analyzed through Mott-Schottky ((MS) measurements, X-ray photoelectron spectroscopy (XPS), and bandgap characterization. Theoretical simulations, including finite-difference time-domain (FDTD) and first-principles calculations, were employed to model surface electric field variations and photoexcited carrier transfer pathways, further elucidating the charge transfer mechanism within the heterostructure. The improved photoelectronic properties and hydrogen evolution performance were attributed to the synergistic effects between ZnO and CeO 2 QDs, including enhanced light absorption capacity, increased exposure of surface active sites, and efficient separation of photogenerated carriers driven by the type-II band alignment of the two semiconductors.
研究领域:
材料科学
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纳米技术
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能量转换
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半导体物理
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电化学
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产品关联
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 21
·4752-4763
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IF 8.928
Zhiqiang Li,Wei Zhou,Yuan Tang,Xin Tan,Yizhong Zhang,Zikang Geng,Yuchen Guo,Lequan Liu,Tao Yu,Jinhua Ye
Graphical The schottky heterojunction is constructed based on the Fermi energy level difference between the metal phase 1T-WS 2 and Zn 0.5 Cd 0.5 S. Under visible light irradiation, the tight interfacial contact leads to strong electronic interactions and facilitates the transfer of photogenerated carriers from Zn 0.5 Cd 0.5 S to 1T-WS 2 , further enhancing photocatalytic hydrogen production. Due to inefficient charge separation and low surface catalytic conversion efficiencies, cocatalysts are required for achieving photocatalytic hydrogen evolution. Being a noble-metal-free cocatalyst, metallic 1T-WS 2 with excellent conductivity can function for this reaction. Herein, 1T-WS 2 /Zn 0.5 Cd 0.5 S is constructed via a simple and feasible grinding approach. The composite containing 7.5 % 1T-WS 2 in 1T-WS 2 /Zn 0.5 Cd 0.5 S achieves a hydrogen evolution rate of 61.65 mmol g −1 h −1 and an external quantum efficiency of 8.04 % at 420 nm, which is 37 times that of bare Zn 0.5 Cd 0.5 S (1.67 mmol g −1 h −1 ). The electrical conductivity of metallic 1T-WS 2 reduces the transfer impedance at the interface and thus accelerates the non-radiative energy transfer and electron transport rate. The different Fermi levels of 1T-WS 2 and Zn 0.5 Cd 0.5 S form a Schottky junction, which promotes the transfer of photogenerated electrons from Zn 0.5 Cd 0.5 S to 1T-WS 2 . More importantly, the close interface contact between 1T-WS 2 and Zn 0.5 Cd 0.5 S results in strong electron interactions, which is conducive to the spatial separation of photogenerated electrons and holes. This work will further expand the application of 1T-WS 2 in the photocatalytic hydrogen evolution process.
研究领域:
材料科学
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催化
·
光催化
·
能源材料
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）