{"title":"Unveiling the Role of Electrocatalysts Activation for Iron-Doped Ni Oxyhydroxide in Enhancing the Catalytic Performance of Oxygen Evolution Reaction","authors":"Jiyoung Kim, JeongEun Yoo, Kiyoung Lee","doi":"10.1002/eem2.12827","DOIUrl":null,"url":null,"abstract":"Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production. To realize the practical application of water electrolysis, an electrocatalyst with high redox properties and low cost is essential for enhancing the sluggish oxygen evolution reaction. Herein, we fabricated Fe-doped nickel oxalate (Fe-NiC<sub>2</sub>O<sub>4</sub>) directly grown on nickel (Ni) foam as an efficient electrocatalyst for the alkaline oxygen evolution reaction using a facile one-step hydrothermal method. Fe-NiC<sub>2</sub>O<sub>4</sub> served as a precursor for obtaining highly active Fe-doped Ni oxyhydroxide (Fe-NiOOH) via <i>in situ</i> electrochemical oxidation. Consequently, 0.75Fe-NiOOH was demonstrated to be the optimal electrocatalyst, exhibiting outstanding oxygen evolution reaction activity with a low overpotential of 220 mV at a current density of 100 mA cm<sup>−2</sup> and a Tafel slope of 20.5 mV dec<sup>−1</sup>. Furthermore, Fe-NiOOH maintained its oxygen evolution reaction activity without performance decay during long-term electrochemical measurements, owing to the phase transformation from nickel oxyhydroxide (NiOOH) to γ-NiOOH (gamma nickel oxyhydroxide). These performances significantly surpass those of recently reported transition-metal-based electrocatalysts.","PeriodicalId":11554,"journal":{"name":"Energy & Environmental Materials","volume":null,"pages":null},"PeriodicalIF":13.0000,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy & Environmental Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/eem2.12827","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production. To realize the practical application of water electrolysis, an electrocatalyst with high redox properties and low cost is essential for enhancing the sluggish oxygen evolution reaction. Herein, we fabricated Fe-doped nickel oxalate (Fe-NiC2O4) directly grown on nickel (Ni) foam as an efficient electrocatalyst for the alkaline oxygen evolution reaction using a facile one-step hydrothermal method. Fe-NiC2O4 served as a precursor for obtaining highly active Fe-doped Ni oxyhydroxide (Fe-NiOOH) via in situ electrochemical oxidation. Consequently, 0.75Fe-NiOOH was demonstrated to be the optimal electrocatalyst, exhibiting outstanding oxygen evolution reaction activity with a low overpotential of 220 mV at a current density of 100 mA cm−2 and a Tafel slope of 20.5 mV dec−1. Furthermore, Fe-NiOOH maintained its oxygen evolution reaction activity without performance decay during long-term electrochemical measurements, owing to the phase transformation from nickel oxyhydroxide (NiOOH) to γ-NiOOH (gamma nickel oxyhydroxide). These performances significantly surpass those of recently reported transition-metal-based electrocatalysts.
期刊介绍:
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.