Journal Article

RuO2 electronic structure and lattice strain dual engineering for enhanced acidic oxygen evolution reaction performance

Zhang, Danfeng, Zhang, Qian, Qiu, Hua-Jun, Qin, Yin, He, Yan-Bing, Zhou, Xiao-Ye, Li, Kaikai, Kang, Feiyu, Yu, Tingting, He, Lunhua, Deng, Sihao, Lin, Dongmei, Jin, Zeyu, Zhang, Tong-Yi

2022

نظرة عامة

Developing highly active and durable electrocatalysts for acidic oxygen evolution reaction remains a great challenge due to the sluggish kinetics of the four-electron transfer reaction and severe catalyst dissolution. Here we report an electrochemical lithium intercalation method to improve both the activity and stability of RuO 2 for acidic oxygen evolution reaction. The lithium intercalates into the lattice interstices of RuO 2 , donates electrons and distorts the local structure. Therefore, the Ru valence state is lowered with formation of stable Li-O-Ru local structure, and the Ru–O covalency is weakened, which suppresses the dissolution of Ru, resulting in greatly enhanced durability. Meanwhile, the inherent lattice strain results in the surface structural distortion of Li x RuO 2 and activates the dangling O atom near the Ru active site as a proton acceptor, which stabilizes the OOH* and dramatically enhances the activity. This work provides an effective strategy to develop highly efficient catalyst towards water splitting. While water splitting in acid offers higher operational performances than in alkaline conditions, there are few high-activity, acid-stable oxygen evolution electrocatalysts. Here, authors examine electrochemical Li intercalation to improve the activity and stability of RuO 2 for acidic water oxidation.

• الناشر: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• موضوع: 147/143 / 639/301/299/886 / 639/4077/909/4086 / 639/638/77/884 / Acidic oxides / Acidic water / Catalysts / Civil engineering / Crystal structure / Dissolution / Durability / Electrocatalysts / Electrochemistry / Electrolytes / Electron transfer / Electronic structure / Evolution / Humanities and Social Sciences / Intercalation / Interstices / Laboratories / Lattice strain / Lithium / multidisciplinary / Oxidation / Oxygen / Oxygen evolution reactions / Phase transitions / Ruthenium oxide / Science / Science (multidisciplinary) / Solid solutions / Stability / Valence / Water splitting