过电位
塔菲尔方程
双金属片
析氧
催化作用
化学工程
无定形固体
材料科学
氢氧化物
成核
分解水
水溶液
无机化学
化学
物理化学
电化学
结晶学
电极
光催化
有机化学
工程类
作者
Yuanyuan Wu,Weipeng Wang,Wei Jiang,Hongji Li,Yunchao Ma,Chunbo Liu,Xiaotian Yang
标识
DOI:10.1016/j.ijhydene.2022.07.078
摘要
OER is a four-electron-proton coupling reaction, generating a high kinetic barrier and suffering from high overpotential and low efficiency. Developing long-time operational stability the oxygen evolution electrocatalysts under large catalytic current densities is a crucial step for efficient OER. Herein, an amorphous NiCo(OH)x modified Co-MOF octahedron assembled by ultra-thin nanosheets catalysts grow on nickel foam (labelled as NiCo(OH)x@Co-MOF/NF) with hierarchical structure is synthesized by a mild interfacial nucleation strategy. The obtained material exhibits an excellent catalytic activity and stability toward OER, a low overpotential of only 210 and 531 mV can be required at 10 and 1000 mA cm −2 current density with remarkable durability for >24 h and a smaller Tafel slope of 43 mV dec −1 in alkaline aqueous solution. The experimental studies demonstrate that the modification of amorphous NiCo(OH)x improves the electrical conductivity of Co-MOF. In addition, the hierarchical structure assembled by ultra-thin nanosheets possess a larger surface area and expose number of active sites, enhancing the charge transfer rate and catalytic performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI