Gradient Heating Epitaxial Growth Gives Well Lattice‐Matched Mo2C−Mo2N Heterointerfaces that Boost Both Electrocatalytic Hydrogen Evolution and Water Vapor Splitting

作者：Youzi Zhang, Peng Guo, Shaohui Guo, Xu Xin, Yijin Wang, Wenjing Huang, Maohuai Wang, Bowen Yang, Ana Jorge Sobrido, Jahan Bakhsh Ghasemi, Jiaguo Yu, Xuanhua Li · 发表于：Angewandte Chemie International Edition · 年份：2022 · DOI：10.1002/anie.202209703 · 被引用次数：78 · 研究领域：Electrocatalysts for Energy Conversion、MXene and MAX Phase Materials、Advanced Photocatalysis Techniques

Abstract An optimized approach to producing lattice‐matched heterointerfaces for electrocatalytic hydrogen evolution has not yet been reported. Herein, we present the synthesis of lattice‐matched Mo2C−Mo2N heterostructures using a gradient heating epitaxial growth method. The well lattice‐matched heterointerface of Mo2C−Mo2N generates near‐zero hydrogen‐adsorption free energy and facilitates water dissociation in acid and alkaline media. The lattice‐matched Mo2C−Mo2N heterostructures have low overpotentials of 73 mV and 80 mV at 10 mA cm−2 in acid and alkaline solutions, respectively, comparable to commercial Pt/C. A novel photothermal‐electrocatalytic water vapor splitting device using the lattice‐matched Mo2C−Mo2N heterostructure as a hydrogen evolution electrocatalyst displays a competitive cell voltage for electrocatalytic water splitting.