摘要
Rational design and controllable synthesis of efficient electrocatalysts for water oxidation is of significant importance for the development of promising energy conversion systems, in particular integrated photoelectrochemical water splitting devices. Cobalt oxide(Co3O4) nanostructures with mixed valences(Ⅱ,Ⅲ)have been regarded as promising electrocatalysts for the oxygen evolution reaction(OER). They are able to promote catalytic support of OER but with only modest activity. Here, we demonstrate that the OER performance of cubic Co3O4 electrocatalyst is obviously improved when they are anchored on delaminated two-dimensional(2D) Ti3C2 MXene nanosheets. Upon activation the overpotential of the hybrid catalyst delivers 300 m V at a current density of 10 m A cm(2) in basic solutions, which is remarkably lower than those of Ti3C2 MXene and Co3O4 nanocubes. The strong interfacial electrostatic interactions between two components contribute to the exceptional catalytic performance and stability. The enhanced OER activity and facile synthesis make these Co3O4 nanocubes-decorated ultrathin 2D Ti3C2 MXene nanosheets useful for constructing efficient and stable electrodes for high-performance electrochemical water splitting.
高效电催化析氧催化剂的理性设计与可控合成对发展新型可持续能源转换系统具有重要意义.具有混合价态的四氧化三钴纳米材料具有一定的电催化析氧活性,但性能一般且导电性较差.本文首先制备出超薄二维MXene纳米片,并在此基础上可控构建0D Co3O4/2D MXene纳米复合材料.二维MXene丰富的表面官能团能很好地调控四氧化三钴纳米颗粒的尺寸.纳米复合催化剂在碱性介质中表现出优异的电催化析氧活性.在电流密度达到10 m A cm-2时,优先的复合催化剂所需的过电位仅为300 m V,远低于纯相MXene和Co3O4纳米颗粒,大幅提升的电催化活性归因于纳米复合材料中两组分间的界面强耦合效应和协同作用.该工作纳米复合材料制备方法简单有效,研究思路可以进一步拓展到其他类似二维MXene基纳米复合材料的设计合成及应用中.
作者
Yi Lu
Deqi Fan
Zupeng Chen
Weiping Xiao
Cancan Cao
Xiaofei Yang
陆依;范德琪;陈祖鹏;肖卫平;曹灿灿;杨小飞(Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,College of Science,Nanjing Forestry University,Nanjing 210037,China;Institute for Chemical and Bioengineering,Department of Chemistry and Applied Biosciences,ETH Ziirich,CH-8093 Zurich,Switzerland;Key Laboratory for Photonic and Electronic Band Materials,Ministry of Education,School of Physics and Electronic Engineering,Harbin Normal University,Harbin J 50025,China)
基金
financial support from the National Natural Science Foundation of China (21975129, 51902164)
Natural Science Foundation of Jiangsu Province (BK20180777, BK20190759)
Natural Science Foundation of Jiangsu Higher Education Institutions of China (18KJB430018, 19KJB430003)
Scientific Research Foundation for Advanced Talents (CXL2018046)
Science Innovation Foundation for Young Scientists (CX2018012)
supported by Student’s Platform for Innovation and Entrepreneurship Training Program in Jiangsu Province (201810298029Z)
Student’s Platform for Innovation and Entrepreneurship Training Program (2018NFUSPITP602)。
