Fe-Incorporated Metal-Organic Cobalt Hydroxide Toward Efficient Oxygen Evolution Reaction

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-05-09 DOI:10.1007/s12678-024-00871-0

Tao Jiang, Yuechao Yao, Feiyan Wu, Iram Aziz, Wenjing Zhang

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Abstract

Metal-organic cobalt hydroxide emerges as a cost-effective electrocatalyst for the oxygen evolution reaction (OER) in energy conversion. However, the limited active sites and poor conductivity hinder their large-scale application. This study employed salicylate as a bridging ligand to synthesize iron-incorporated metal-organic cobalt hydroxide. The influence of Fe intercalation on Co(OH)(Hsal) (where Hsal denotes o-HOC₆H₄COO⁻) was investigated using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Fe_0.2Co_0.8(OH)(Hsal) demonstrates remarkable electrocatalytic activity, displaying an OER overpotential of 298 mV at 10 mA cm⁻² and a Tafel slope of 57.46 mV dec⁻¹. This enhancement can be attributed to improved charge transfer kinetics and increased active sites. This work highlights the crucial role of Fe in improving the efficiency of Co-based oxygen-evolving catalysts (OECs) and its potential for boosting efficient hydrogen generation in alkaline environments.

Graphical Abstract

Abstract Image

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铁掺杂金属有机氢氧化钴实现高效氧气进化反应

金属有机氢氧化钴是能源转换中氧进化反应（OER）的一种经济高效的电催化剂。然而，有限的活性位点和较差的导电性阻碍了其大规模应用。本研究采用水杨酸盐作为桥接配体，合成了铁插层金属有机氢氧化钴。利用 X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 研究了铁插层对 Co(OH)(Hsal)（其中 Hsal 表示 o-HOC6H4COO-）的影响。Fe0.2Co0.8(OH)(Hsal)显示出显著的电催化活性，在 10 mA cm-2 的条件下，OER 过电位为 298 mV，Tafel 斜率为 57.46 mV dec-1。这种增强可归因于电荷转移动力学的改善和活性位点的增加。这项工作凸显了铁在提高钴基氧发生催化剂（OECs）效率方面的关键作用，以及其在促进碱性环境中高效制氢方面的潜力。

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.