材料科学
异质结
X射线光电子能谱
氮化物
分解水
电催化剂
双金属片
过渡金属
化学工程
二硫化钼
碳化物
纳米技术
光电子学
电化学
光催化
金属
催化作用
电极
复合材料
冶金
化学
物理化学
工程类
图层(电子)
生物化学
作者
Zongkui Kou,Tingting Wang,Qilin Gu,Mo Xiong,Lirong Zheng,Xin Li,Zhenghui Pan,Hao Chen,Francis Verpoort,Anthony K. Cheetham,Shichun Mu,John Wang
标识
DOI:10.1002/aenm.201803768
摘要
Abstract Due to integrated advantages in electrochemical functionalities for energy conversion, 2D nonlayered heterostructure nanosheets offer new and fascinating opportunities for electrocatalysis but their fabrication is challenging when compared with the widely studied 2D layered heterostructure. Herein, a bottom‐up approach is established for facile synthesis of holey 2D transition metal carbide/nitride heterostructure nanosheets (h‐TMCN) with regulated hole sizes by controlled thermal annealing of the Mo/Zn bimetallic imidazolate frameworks (Mo/Zn BIFs). Ex situ phase and structural identifications disclose that the Mo/Zn BIFs precursor experiences interconnected three steps of transformation to produce h‐TMCN. Especially, the slow successive solid‐state diffusion of nitrogen and carbon into immediate noncrystalline molybdenum oxides allows the intergrowth of Mo 2 C and Mo 2 N into the 2D nonlayered heterostructure. X‐ray fine structure analysis coupled with high resolution X‐ray photoelectron spectroscopy demonstrate that Mo 2 C and Mo 2 N in the microdomains can chemically bond with each other, producing the abundant active N–Mo–C interfaces toward water splitting. Consequently, h‐TMCN affords low overpotentials, high turnover frequencies, rapid charge transfer, and superior long‐term stability toward electrocatalytic water oxidation. The present work demonstrates the feasibility of developing a broad range of 2D nonlayered heterostructures for high efficiency chemical energy conversion.
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