析氧
分解水
氢氧化物
钙钛矿(结构)
电化学
催化作用
镍
氧化物
化学
电解水
锰
化学工程
无机化学
氧气
电催化剂
材料科学
电解
电极
电解质
物理化学
结晶学
生物化学
有机化学
光催化
工程类
作者
Maria Christy,Hashikaa Rajan,S. Subramanian,Seunggun Choi,Jiseok Kwon,Supriya A. Patil,Kangchun Lee,Ho Bum Park,Taeseup Song,Ungyu Paik
标识
DOI:10.1016/j.ijhydene.2023.07.029
摘要
Perovskites have garnered huge interest as electrocatalysts in water–oxidation. Despite their salient features, chemical instability of the perovskite oxide surfaces still limits their durability in electrochemical water–splitting. Here, we propose a simple strategy to increase the overall activity and stability of La0.6Sr0.4CoO3-δ (LSC) perovskite just by reconstructing its surface. Preeminent oxygen evolution (OER) and hydrogen evolution reaction (HER) catalysts, namely, nickel–iron oxyhydroxide (NiFe(OH)2 denoted as NiFe) and nickel–manganese hydroxide (NiMn(OH)2 denoted as NiMn) are in–situ anchored on LSC surface, respectively. The resulting composites greatly facilitate the electron mobility and deliver excellent activity towards OER and HER with low overpotentials of η = 250 mV at 10 mA cm−2 and η = 63 mV at 50 mA cm−2, respectively. The (LSC@NiFe‖LSC@NiMn) electrolyzer reached 10 mA cm−2 at a cell voltage of 1.57 V. We also validated the redistribution of electrons and oxygen, and the abundance of exposed active sites by incorporation of active hydroxides.
科研通智能强力驱动
Strongly Powered by AbleSci AI