{"title":"Efficient electrocatalysts for OER: Amorphous cerium-doped cobalt sulfide with enhanced performance and durability","authors":"","doi":"10.1016/j.surfin.2024.105108","DOIUrl":null,"url":null,"abstract":"<div><p>Developing highly efficient electrocatalysts is essential for advancing the oxygen evolution reaction (OER), a key step in water splitting. In this study, a novel approach for the synthesis of an amorphous sulfide structure has been presented. First, a cerium-doped zeolitic imidazolate framework-67 (Ce-ZIF-67) using a co-precipitation method, followed by a multi-step transformation process. This process includes oxidation to form cerium-doped cobalt oxide (Ce-CO) and a subsequent sulfidation step to produce an amorphous cerium-doped cobalt sulfide (Ce-CS) structure. The introduction of cerium and the formation of an amorphous sulfide structure result in a significantly enhanced OER performance due to increased atomic disorder, improved electron mobility, and an expanded active surface area. Remarkably, the Ce-CS structure achieved a reduction in overpotential from 352 mV for Ce-CO to 291 mV at 100 mA cm<sup>−2</sup> in 1.0 M KOH, alongside a Tafel slope reduction from 86.2 mA decade<sup>−1</sup> to 67.2 mV decade<sup>−1</sup>. These enhancements underline the importance of cerium doping and amorphization in optimizing electrocatalytic efficiency. Furthermore, the Ce-CS catalyst demonstrated exceptional durability, with no observable degradation in performance or structural integrity after 10 h of continuous operation. This work presents a pioneering strategy for designing and synthesizing highly effective OER electrocatalysts, contributing a significant advancement to the field.</p></div>","PeriodicalId":22081,"journal":{"name":"Surfaces and Interfaces","volume":null,"pages":null},"PeriodicalIF":5.7000,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surfaces and Interfaces","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468023024012641","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Developing highly efficient electrocatalysts is essential for advancing the oxygen evolution reaction (OER), a key step in water splitting. In this study, a novel approach for the synthesis of an amorphous sulfide structure has been presented. First, a cerium-doped zeolitic imidazolate framework-67 (Ce-ZIF-67) using a co-precipitation method, followed by a multi-step transformation process. This process includes oxidation to form cerium-doped cobalt oxide (Ce-CO) and a subsequent sulfidation step to produce an amorphous cerium-doped cobalt sulfide (Ce-CS) structure. The introduction of cerium and the formation of an amorphous sulfide structure result in a significantly enhanced OER performance due to increased atomic disorder, improved electron mobility, and an expanded active surface area. Remarkably, the Ce-CS structure achieved a reduction in overpotential from 352 mV for Ce-CO to 291 mV at 100 mA cm−2 in 1.0 M KOH, alongside a Tafel slope reduction from 86.2 mA decade−1 to 67.2 mV decade−1. These enhancements underline the importance of cerium doping and amorphization in optimizing electrocatalytic efficiency. Furthermore, the Ce-CS catalyst demonstrated exceptional durability, with no observable degradation in performance or structural integrity after 10 h of continuous operation. This work presents a pioneering strategy for designing and synthesizing highly effective OER electrocatalysts, contributing a significant advancement to the field.
期刊介绍:
The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results.
Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)