Ir/IrOx/WO3 electrocatalysts for water splitting†

IF 6 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Materials Chemistry Frontiers Pub Date : 2023-08-14 DOI:10.1039/D3QM00550J

Xiaohe Tan, Wangyan Gou, Linqing Liao, Yuanyuan Ma and Yongquan Qu

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Abstract

Developing high-performance electrocatalysts for water splitting in both acidic and basic electrolytes is of significance for hydrogen production. Despite the great advances achieved, efficient design and synthesis of electrocatalysts with the same chemical composition for both hydrogen and oxygen evolution in the same electrolyte is still expected. Herein, a series of Ir/IrO_x/WO₃ electrocatalysts, synthesized via electrospinning and subsequent pyrolysis, delivered high performance for both hydrogen and oxygen evolution in acidic and basic environments. Among them, Ir/IrO_x/WO₃ calcinated at 350 °C delivered the best activity for oxygen evolution through a lattice oxygen mediated pathway. Ir/IrO_x/WO₃ treated at 450 °C exhibited the highest activity for hydrogen evolution in both acidic and basic electrolytes due to the enhanced adsorption of active hydrogen species in the acidic electrolyte and promoted water dissociation in the basic electrolyte, respectively. Thereafter, coupling two electrocatalysts as the cathode and the anode delivered high performance for overall water splitting in both acidic and basic electrolytes.

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用于水分解的IrOx/WO3电催化剂

开发用于在酸性和碱性电解质中分解水的高性能电催化剂对制氢具有重要意义。尽管取得了巨大进展，但仍有望有效设计和合成具有相同化学成分的电催化剂，用于在相同电解质中析氢和析氧。本文中，通过静电纺丝和随后的热解合成的一系列Ir/IrOx/WO3电催化剂在酸性和碱性环境中提供了高性能的析氢和析氧。其中，在350°C下煅烧的Ir/IrOx/WO3通过晶格氧介导的途径提供了最佳的析氧活性。在450°C下处理的Ir/IrOx/WO3在酸性和碱性电解质中均表现出最高的析氢活性，这分别是由于增强了活性氢在酸性电解质中的吸附和促进了水在碱性电解质中的离解。此后，将两种电催化剂作为阴极和阳极耦合，在酸性和碱性电解质中提供了高性能的整体水分解。

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来源期刊

Materials Chemistry Frontiers Materials Science-Materials Chemistry

CiteScore

12.00

自引率

2.90%

发文量

313

期刊介绍： Materials Chemistry Frontiers focuses on the synthesis and chemistry of exciting new materials, and the development of improved fabrication techniques. Characterisation and fundamental studies that are of broad appeal are also welcome. This is the ideal home for studies of a significant nature that further the development of organic, inorganic, composite and nano-materials.