Electric field-assisted synthesis of multivalent WO3-x coupling with carbon nanotubes for promoting (photo-)electrocatalytic oxygen evolution reaction

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-18 DOI:10.1016/j.ijhydene.2025.04.180

Wei Wen , Jianru Gao , Man Zhao, Qinyun Yan, Liwu Qiang, Shuai He, Peipei Zhao, Chunmei Liu, Jiamin Ma, Li Zhang, Junming Zhang, He Xiao, Jianfeng Jia

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Abstract

To enhance the kinetic rate of oxygen evolution reaction (OER) in water splitting, a composite (WO_3-x/CNT) of multivalent WO_3-x coupling with carbon nanotube (CNT) is successfully synthesized by a facile electric field-assisted synthesis method. The characterization data indicate that an oxygen bridge structure of W–O–C is formed in WO_3-x/CNT due to strong interaction between WO_3-x and carbon nanotubes. Benefitting from this unique interfacial W–O–C structure, the electronic structure of tungsten sites is regulated through electron-transfer from tungsten atoms to carbon atoms. This obtained electronic structure promotes the intrinsic activity of WO_3-x/CNT and optimizes the adsorption of active OH∗ species. Moreover, the CNT support improves the overall conductivity. The optimal WO_3-x/CNT-2h sample exhibits an overpotential of only 326 mV (without iR compensation) at 10 mA cm⁻², much lower than that of commercial RuO₂ (341 mV). With the introduction of illumination, OER activity on WO_3-x/CNT-2h is tremendously enhanced and the overpotential is reduced to 276 mV at 10 mA cm⁻². This improvement is attributed to photo-generated holes, which creates additional active sites for OER. This work not only encourages the application of novel electrosynthesis methods for designing multivalent metal-based OER electrocatalysts but also highlights the synergistic effect of photoelectricity in enhancing OER performance.

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电场辅助合成多价WO3-x与碳纳米管偶联促进（光）电催化析氧反应

为了提高析氧反应（OER）的动力学速率，采用电场辅助合成方法成功合成了多价WO3-x与碳纳米管（CNT）偶联的复合材料（WO3-x/CNT）。表征数据表明，由于WO3-x与碳纳米管之间的强相互作用，在WO3-x/CNT中形成了W-O-C的氧桥结构。得益于这种独特的W-O-C界面结构，钨位的电子结构通过从钨原子到碳原子的电子转移来调节。所获得的电子结构促进了WO3-x/CNT的固有活性，并优化了活性OH *的吸附。此外，碳纳米管支架提高了整体导电性。最佳WO3-x/CNT-2h样品在10 mA cm−2下的过电位仅为326 mV（无iR补偿），远低于商用RuO2的过电位（341 mV）。随着光照的引入，WO3-x/CNT-2h上的OER活性大大增强，过电位在10 mA cm -2时降至276 mV。这种改进归功于照片生成的孔，它为OER创建了额外的活动站点。这项工作不仅鼓励了新的电合成方法在设计多价金属基OER电催化剂中的应用，而且突出了光电在提高OER性能方面的协同作用。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.