(Co,N)/C氧电极催化剂的制备和性能  

Preparation and Properties of Oxygen Electrode Catalyst(Co,N)/C

作　　者：王慧华[1,2] 葛彬[1] 苏丽娟[1] 屈天鹏[1] 王德永[1] 康振辉[2] 

机构地区：[1]苏州大学沙钢钢铁学院,苏州215021 [2]苏州大学纳米科学技术学院,苏州215021

出　　处：《材料研究学报》2017年第4期267-273,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51422207;51604179;51674172);江苏省自然科学基金(BK20140346;BK20150334)~~

摘　　要：以C点、NH_3·H_2O和Co(Ac)2·6H_2O为原料,用溶剂热方法制备了(Co,N)/C纳米催化剂。结果表明,催化剂多元掺杂比无掺杂或单一掺杂具有更好的氧还原催化活性,其氧还原起峰电位为-0.08 V,峰电位为-0.165 V,接近Pt-C(20%Pt)催化的起峰电位(-0.068 V);在该过程中氧还原转移电子数为3.59,接近一级反应动力学(转移电子数=4),中间产物H_2O_2的含量约25%。甲醇对(Co,N)/C催化剂催化能力的影响较小,循环催化10 h后其催化性能只下降8.8%,明显优于Pt-C在甲醇中的催化稳定性(下降37.9%)。N-(C)_2,C-N-C以及Co-C键都是催化剂的主要活性单元,纳米Co_3O_4颗粒可协同提高催化剂的催化能力。Nano-catalyst of （Co, N）/C has been successfully synthesized by solvothermal method using Co（Ac）2, NH3,H20 and nano-carbon powder as starting materials. The results show that the oxygen reduction reaction （ORR） activity of （Co, N）/C is better than that of single nitrogen-doped or cobalt-doped nano-carbon powder in terms of the onset potential （-0.08 V） and peak potential （-0.165 V）, which is com- parable to the commercial catalyst Pt-C. The electron-transferred number of （Co, N）/C for ORR is about 3.59, which is close to the first order reaction kinetics of ORR （n=4）. The intermediate product of H202 produced from the ORR takes up about 25%. The （Co, N）/C catalyst also exhibits better methanol durability and stability comparing to the commercial Pt-C （20% Pt）. Bonds of N-（C）2, C-N-C and Co-C are the main active units of the catalyst and Co30, nano-particles can cooperatively improve the ability of catalyst.

关 键 词：金属-空气电池 (Co N)/C纳米催化剂 氧还原 起峰电位 掺杂 

分 类 号：TM911[电气工程—电力电子与电力传动]