Fe2O3/P-doped CoMoO4 electrocatalyst delivers efficient overall water splitting in alkaline media

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-01-16 DOI:10.1016/j.apcatb.2024.123741

Bowen Wang , Xiangxiong Chen , Yingjian He , Qin Liu , Xinxin Zhang , Ziyu Luo , John V. Kennedy , Junhua Li , Dong Qian , Jinlong Liu , Geoffrey I.N. Waterhouse

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Abstract

Phosphorization of molybdates has been shown to promote hydrogen evolution reaction (HER) activity but is usually detrimental to oxygen evolution reaction (OER) activity, frustrating efforts to create bifunctional HER/OER electrocatalysts. Herein, we show that Fe₂O₃-modulated P-doped CoMoO₄ on nickel foam (Fe-P-CMO) is an excellent bifunctional HER/OER electrocatalyst in alkaline media, with the adverse effect of phosphorization on the OER activity of CoMoO₄ being countered via Fe₂O₃ introduction. An alkaline splitting electrolyser assembled directly using the self-supporting Fe-P-CMO electrode possessed outstanding long-term durability with ultralow cell voltages of 1.48 and 1.59 V required to achieve current densities of 10 and 100 mA cm⁻², respectively. Detailed experimental investigations showed that during HER, P-doped CoMoO₄ in Fe-P-CMO underwent surface reconstruction with the in-situ formation of Co(OH)₂ on the P-CoMoO₄ (Co(OH)₂/P-CoMoO₄). During OER, P-doped CoMoO₄ was deeply reconstructed to CoOOH with the complete dissolution of Mo, leading to the in-situ formation of Fe₂O₃/CoOOH heterojunctions.

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掺杂 Fe2O3/P 的 CoMoO4 电催化剂在碱性介质中实现高效整体水分离

研究表明，钼酸盐的磷化可促进氢进化反应（HER）活性，但通常不利于氧进化反应（OER）活性，这使人们在开发双功能 HER/OER 电催化剂方面的努力受挫。在本文中，我们展示了在泡沫镍（Fe-P-CMO）上经 Fe2O3 调制的 P 掺杂 CoMoO4 在碱性介质中是一种极佳的双功能 HER/OER 电催化剂，通过引入 Fe2O3 可以抵消磷化对 CoMoO4 OER 活性的不利影响。直接使用自支撑 Fe-P-CMO 电极组装的碱性分裂电解槽具有出色的长期耐久性，实现 10 mA cm-2 和 100 mA cm-2 电流密度所需的超低电池电压分别为 1.48 V 和 1.59 V。详细的实验研究表明，在 HER 期间，Fe-P-CMO 中的 P 掺杂 CoMoO4 经历了表面重构，在 P-CoMoO4 上原位形成了 Co(OH)2（Co(OH)2/P-CoMoO4）。在 OER 过程中，随着 Mo 的完全溶解，P 掺杂的 CoMoO4 被深度重构为 CoOOH，从而在原位形成了 Fe2O3/CoOOH 异质结。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.

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