Jumin Huang , Ruijie Gao , Baowei Wang , Xun Cui , Lun Pan , Zhen-Feng Huang , Xiangwen Zhang , Ji-Jun Zou
{"title":"Anchoring single iridium atoms on defective nickel–iron layered double hydroxides for promoting oxygen evolution reaction","authors":"Jumin Huang , Ruijie Gao , Baowei Wang , Xun Cui , Lun Pan , Zhen-Feng Huang , Xiangwen Zhang , Ji-Jun Zou","doi":"10.1016/j.ces.2025.121606","DOIUrl":null,"url":null,"abstract":"<div><div>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<sup>−2</sup> and 266 mV at 500 mA cm<sup>−2</sup>, with the Tafel slope of 40.1 mV dec<sup>-1</sup>. 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-NiFe<sup>vac</sup>-LDH, but also provides a new idea for the development of OER catalytic materials with high activity and stability.</div></div>","PeriodicalId":271,"journal":{"name":"Chemical Engineering Science","volume":"311 ","pages":"Article 121606"},"PeriodicalIF":4.3000,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0009250925004294","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
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.
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.