Anchoring single iridium atoms on defective nickel–iron layered double hydroxides for promoting oxygen evolution reaction

IF 4.3 2区 工程技术 Q2 ENGINEERING, CHEMICAL
Jumin Huang , Ruijie Gao , Baowei Wang , Xun Cui , Lun Pan , Zhen-Feng Huang , Xiangwen Zhang , Ji-Jun Zou
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Abstract

Nickel-iron layered double hydroxides (LDH) are recognized as the most active electrocatalysts for the alkaline oxygen evolution, but still suffer from their unsatisfied stability due to Fe dissolution and phase segregation. In this study, we demonstrate that anchoring iridium (Ir) single atoms over LDH with cationic defects can significantly increase both LDH stability and activity. The obtained catalyst exhibits the overpotential of 240 mV at a current density of 100 mA cm−2 and 266 mV at 500 mA cm−2, with the Tafel slope of 40.1 mV dec-1. X-ray absorption spectroscopy results indicate that isolated single-atom iridium remains in the + 4 oxidation state, and anchoring Ir atoms into metal defective LDH is expected to strengthen Fe-O binding due to the weak covalency of Ir-O, which contributes to the promoting stability. This work not only develops a simple and practical strategy for the synthesis of Ir-NiFevac-LDH, but also provides a new idea for the development of OER catalytic materials with high activity and stability.

Abstract Image

Abstract Image

将单个铱原子锚定在缺陷镍铁层状双氧水上,促进析氧反应
镍铁层状双氢氧化物(LDH)是公认的碱性析氧活性最高的电催化剂,但由于铁的溶解和相偏析,其稳定性仍不理想。在这项研究中,我们证明了将铱(Ir)单原子锚定在具有阳离子缺陷的LDH上可以显著提高LDH的稳定性和活性。所得催化剂在电流密度为100 mA cm - 2时的过电位为240 mV,在电流密度为500 mA cm - 2时的过电位为266 mV, Tafel斜率为40.1 mV dec1。x射线吸收光谱结果表明,分离的单原子铱保持在 + 4氧化态,由于Ir- o的共价较弱,将Ir原子锚定在金属缺陷LDH中有望加强Fe-O的结合,从而促进稳定性。这项工作不仅为ir - nifevaca - ldh的合成提供了一种简单实用的策略,而且为开发高活性、高稳定性的OER催化材料提供了新的思路。
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来源期刊
Chemical Engineering Science
Chemical Engineering Science 工程技术-工程:化工
CiteScore
7.50
自引率
8.50%
发文量
1025
审稿时长
50 days
期刊介绍: Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.
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