Tao Zhao , Yunzhen Jia , Qiang Fang , Runxin Du , Genyan Hao , Wenqing Sun , Guang Liu , Dazhong Zhong , Jinping Li , Qiang Zhao
{"title":"Amorphous-rich RuMnOx aerogel with weakened Ru–O covalency for efficient acidic water oxidation","authors":"Tao Zhao , Yunzhen Jia , Qiang Fang , Runxin Du , Genyan Hao , Wenqing Sun , Guang Liu , Dazhong Zhong , Jinping Li , Qiang Zhao","doi":"10.1016/j.jechem.2024.12.053","DOIUrl":null,"url":null,"abstract":"<div><div>Ruthenium dioxide (RuO<sub>2</sub>) is one of the most promising acidic oxygen evolution reaction (OER) catalysts to replace the expensive and prevalent iridium (Ir)-based materials. However, the lattice oxygen oxidation induced Ru dissolution during OER compromises the activity and stability. Amorphous materials have been identified as a viable strategy to promote the stability of RuO<sub>2</sub> in acidic OER applications. This study reported a nanoporous amorphous-rich RuMnO<em><sub>x</sub></em> (A-RuMnO<em><sub>x</sub></em>) aerogel for efficient and stable acidic OER. Compared with highly crystalline RuMnO<em><sub>x</sub></em>, the weakened Ru–O covalency of A-RuMnO<em><sub>x</sub></em> by forming amorphous structure is favorable to inhibiting the oxidation of lattice oxygen. Meanwhile, this also optimizes the electronic structure of Ru sites from overoxidation and reduces the reaction energy barrier of the rate-determining step. As a result, A-RuMnO<em><sub>x</sub></em> aerogel exhibits an ultra-low overpotential of 145 mV at 10 mA cm<sup>−2</sup> and durability exceeding 100 h, as well as high mass activity up to 153 mA mg<sup>−1</sup><sub>Ru</sub> at 1.5 V vs. reversible hydrogen electrode (RHE). This work provides valuable guidance for preparing highly active and stable Ru-based catalysts for acidic OER.</div></div>","PeriodicalId":15728,"journal":{"name":"Journal of Energy Chemistry","volume":"104 ","pages":"Pages 414-421"},"PeriodicalIF":13.1000,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Energy Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2095495625000269","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Energy","Score":null,"Total":0}
引用次数: 0
Abstract
Ruthenium dioxide (RuO2) is one of the most promising acidic oxygen evolution reaction (OER) catalysts to replace the expensive and prevalent iridium (Ir)-based materials. However, the lattice oxygen oxidation induced Ru dissolution during OER compromises the activity and stability. Amorphous materials have been identified as a viable strategy to promote the stability of RuO2 in acidic OER applications. This study reported a nanoporous amorphous-rich RuMnOx (A-RuMnOx) aerogel for efficient and stable acidic OER. Compared with highly crystalline RuMnOx, the weakened Ru–O covalency of A-RuMnOx by forming amorphous structure is favorable to inhibiting the oxidation of lattice oxygen. Meanwhile, this also optimizes the electronic structure of Ru sites from overoxidation and reduces the reaction energy barrier of the rate-determining step. As a result, A-RuMnOx aerogel exhibits an ultra-low overpotential of 145 mV at 10 mA cm−2 and durability exceeding 100 h, as well as high mass activity up to 153 mA mg−1Ru at 1.5 V vs. reversible hydrogen electrode (RHE). This work provides valuable guidance for preparing highly active and stable Ru-based catalysts for acidic OER.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy