A Kinetic Control Strategy for One‐Pot Synthesis of Efficient Bimetallic Metal‐Organic Framework/Layered Double Hydroxide Heterojunction Oxygen Evolution Electrocatalysts. (29th January 2023)

• Record Type: Journal Article
• Authors: Mu, Guomei; Wang, Guangzhao; Huang, Qiuping; Miao, Yujie; Wen, Dan; Lin, Dunmin; Xu, Chenggang; Wan, Yinji; Xie, Fengyu; Guo, Wenhan; Zou, Ruqiang
• Is Part Of: Advanced functional materials. Volume 33:Number 13(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-29
• Subjects: heterojunction catalysts -- kinetic control -- layered double hydroxides -- metal‐organic frameworks -- oxygen evolution reactions; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202211260
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Heterojunction materials are promising candidates for oxygen evolution reaction (OER) electrocatalysts to break the linear scaling relationship and lower the reaction barrier. However, the application of heterojunction materials is always hindered by the complicated multistep synthetic procedures which bring cost, complexity, and reproducibility issues. Herein, a strategy of kinetic controlled synthesis is developed to achieve the one‐pot formation of bimetallic metal‐organic framework (MOF)/layered double hydroxide (LDH) heterojunction electrodes as highly efficient OER electrocatalysts. The heterojunction electrodes present hierarchical structures with highly porous NiFe‐LDH nanosheet networks vertically grown on the surface of NiFe‐MOF‐74 microprisms, promoting fast mass transport and high exposure of active sites. The strong interactions at the MOF/LDH heterojunction interfaces contribute to the outstanding OER activity surpassing the state‐of‐art RuO2 OER catalysts. The MOF/LDH heterojunction electrode exhibits an ultralow overpotential of only 159.7 mV to reach the current density of 10 mA cm −2, and yields large current densities at small overpotential (100 mA cm −2 at 230.2 mV and 1000 mA cm −2 at 284.3 mV) with long‐term durability. This study presents an innovative approach to construct heterojunction materials with simple one‐step synthesis, offering a promising pathway for high‐efficiency electrocatalyst development. Abstract : A kinetic control strategy is developed as a simple method to acquire metal‐organic framework/layered double hydroxide heterojunction electrodes by one‐pot, one‐step solvothermal synthesis. The electrodes with hierarchical heterostructures present superior electrocatalytic oxygen evolution reaction (OER) performance and stability, especially at large current densities. Theoretical calculation reveals that heterojunction structure can modulate the binding energy and lower the kinetic barrier of OER process.