Robust copper nanocrystal/nitrogen-doped carbon monoliths as carbon monoxide-resistant electrodes for methanol oxidation reaction  

作　　者：Fei Chen Na Wu Meixu Zhai Xue Zhang Ruihong Guo Tuoping Hu Mingming Ma 

机构地区：[1]Department of Chemistry,College of Science,North University of Chin1,Taiyuan 030051,Shanxi,China [2]CAS Key Laboratory of Soft Matter Chemistry,Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of Chin1,Hefei 230026,Anhui,China

出　　处：《Journal of Energy Chemistry》2021年第7期247-255,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21722406,21975240,21676258);by the Fundamental Research Funds for the Central Universities(WK2060190102);by the Central Leading Local Science and Technology Development Special Fund Project(YDZX20191400002636);by the Scientific and Technologial Innovation Programs of Higher Education Institutions in Shanxi(STIP 2020L0695)。

摘　　要：Noble metal-based electrocatalysts present high activities for methanol oxidation reaction(MOR),but are limited by their high cost,low stability and poor resistance to carbon monoxide(CO) poisoning.The development of active and stable non-noble metal electrocatalysts for MOR is desired,but remains a challenge.Herein,we report a simple strategy to make copper nanocrystal/nitrogen-doped carbon(Cu/N-C)monoliths,which can serve as active and robust electrodes for MOR.Copper nanocrystals were electrochemically deposited onto a conductive polyaniline hydrogel and calcined to form Cu/N-C monolith,where the active copper nanocrystals are protected by nitrogen-doped carbon.Owing to their extremely high electrical conductivity(1.25 × 10^(5) S cm^(-1)) and mechanical robustness,these Cu/N-C monoliths can be directly used as electrodes for MOR,without using substrates or additives.The optimal Cu/N-C(FT)@500 monolith shows a high MOR activity of 189 mA cm^(-2) at 0.6 V vs.SCE in alkaline methanol solution,superior to most of reported Cu-based MOR catalysts.Cu/N-C(FT)@500 also presents a better stability than Pt/C catalyst in the long-term MOR test at high current densities.Upon carbon monoxide(CO) poisoning,Cu/N-C(FT)@500 retains 96% of its MOR activity,far exceeding the performance of Pt/C catalyst(61% retention).Owing to its facile synthesis,outstanding activity,high stability and mechanical robustness,Cu/N-C(FT)@500 monolith is promising as a low-cost,efficient and CO-resistant electrocatalyst for MOR.

关 键 词：Copper nanocrystal Methanol oxidation reaction Non-noble metal-based electrocatalysts Poison-resistant electrocatalysts Nitrogen-doped carbon 

分 类 号：TQ426[化学工程] TM911.4[电气工程—电力电子与电力传动]