Water Oxidation in the Presence of Iron-Doped Copper (Hydr)Oxide

IF 4.3 2区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Mohammad Saleh Ali Akbari, Subhajit Nandy, Pavlo Aleshkevych, Keun Hwa Chae, Mohammad Mahdi Najafpour
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Abstract

This study explores the influence of Fe ion incorporation on the oxygen-evolution reaction (OER) in alkaline media, utilizing CuO-based materials. Instead of developing an efficient and stable OER catalyst, this research investigates two distinct CuO variants: one with Fe ions adhered to the surface and another with Fe ions integrated into the CuO lattice. By employing a variety of analytical techniques, the study demonstrates that the CuO variant with surface-bound Fe ions (referred to as compound 1) exhibits significantly enhanced OER performance compared to the variant with internally embedded Fe ions (referred to as compound 2). The Tafel plots obtained from multistep amperometry profiles for compounds 1 and 2, as well as pure CuO and FeO(OH), exhibit linear relationships in the log(j) vs overpotential plot, with Tafel slopes of 39.3, 41.5, 115.9, and 121.9 mV/decade, respectively. These Tafel slopes indicate that compounds 1 and 2 likely share a similar reaction mechanism, whereas CuO and FeO(OH) appear to follow distinct mechanisms. At 570 mV overpotential, the turnover frequencies of Fe ions for compounds 1 and 2, as well as for FeO(OH), calculated from electrode compositions and chronoamperometry data, are found to be 1.1, 0.2, and 5.7 × 10–4 s–1, respectively. Despite the differing distributions of Fe ions, both CuO variants exhibit similar Tafel slopes, suggesting that they follow comparable OER mechanisms. Additionally, cyclic voltammetric profiles, corrected for the electrochemically active surface area, indicate that FeO(OH) demonstrates notably higher activity than the other compounds. These findings deepen our understanding of Fe’s role in CuO structures for OER processes and offer valuable insights for the design of more efficient electrocatalytic materials in alkaline environments.

Abstract Image

铁掺杂铜(水合)氧化物存在下的水氧化
本研究利用cuo基材料,探讨了Fe离子掺入对碱性介质中析氧反应(OER)的影响。本研究没有开发一种高效稳定的OER催化剂,而是研究了两种不同的CuO变体:一种是铁离子粘附在表面,另一种是铁离子集成到CuO晶格中。通过使用多种分析技术,该研究表明,与具有内部嵌入铁离子的变体(称为化合物2)相比,具有表面结合铁离子的CuO变体(称为化合物1)具有显著增强的OER性能。化合物1和2以及纯CuO和FeO(OH)的多步安培曲线获得的Tafel图在log(j)与过电位图中呈现线性关系,其Tafel斜率为39.3,41.5。分别为115.9和121.9 mV/ 10年。这些Tafel斜率表明化合物1和2可能具有相似的反应机制,而CuO和FeO(OH)似乎遵循不同的反应机制。在570 mV过电位下,化合物1和化合物2以及FeO(OH)的Fe离子周转率分别为1.1、0.2和5.7 × 10-4 s-1。尽管铁离子的分布不同,但两种CuO变体表现出相似的Tafel斜率,表明它们遵循类似的OER机制。此外,根据电化学活性表面积进行校正的循环伏安谱表明,FeO(OH)的活性明显高于其他化合物。这些发现加深了我们对Fe在OER过程中CuO结构中的作用的理解,并为在碱性环境中设计更高效的电催化材料提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Inorganic Chemistry
Inorganic Chemistry 化学-无机化学与核化学
CiteScore
7.60
自引率
13.00%
发文量
1960
审稿时长
1.9 months
期刊介绍: Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.
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