Hierarchical structure of amorphous bimetallic hydroxide modified Co-metal organic framework catalyst efficient and robust for oxygen evolution reaction |
| |
Affiliation: | 1. Key Laboratory of Preparation Application of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Siping 136000, PR China;2. College of Chemistry, Jilin Normal University, Siping 13600, PR China;3. College of Environmental Science and Engineering, Jilin Normal University, Siping 13600, PR China |
| |
Abstract: | 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. |
| |
Keywords: | Hierarchical structure Oxygen evolution reaction Catalytic performance High current density |
本文献已被 ScienceDirect 等数据库收录! |
|