Yin Yanhong, Zhang Hengbo, Gao Rongzhen, Wang Aili, Mao Xinxin, Dong Hongyu, Yang Shuting
School of Chemistry and Chemical Engineering, Henan Normal University Xinxiang Henan 453007 P. R. China.
National & Local Joint Engineering Laboratory for Motive Power and Key Materials Xinxiang Henan 453007 China.
RSC Adv. 2018 Jul 12;8(44):25051-25056. doi: 10.1039/c8ra03139h. eCollection 2018 Jul 9.
In this work, a Co-N doped carbon nanotube (CNT) catalyst was fabricated a simple pyrolysis approach and the effects of solvothermal processing on the catalytic activity of the as-prepared material were investigated in detail. The results show that after solvothermal processing (Co-NC) the catalyst has a more homogeneous anemone structure, a higher nitrogen content, a larger BET surface area and a higher degree of graphitization compared to the catalyst produced after non-solvothermal processing (Co-MA). The results of electrochemical tests indicate that Co-NC, compared to commercial 20% Pt/C and Co-MA, has an improved mass transfer process and sufficient active site exposure, which brings about superb oxygen reduction electrocatalytic activity, a higher reduction potential (-0.2 V Ag/AgCl), a limiting diffusion current (5.44 mA cm) and excellent stability in 0.1 M KOH solution.
在本工作中，通过一种简单的热解方法制备了一种钴氮掺杂碳纳米管（CNT）催化剂，并详细研究了溶剂热处理对所制备材料催化活性的影响。结果表明，与非溶剂热处理后制备的催化剂（Co-MA）相比，经过溶剂热处理（Co-NC）后的催化剂具有更均匀的海葵结构、更高的氮含量、更大的比表面积和更高的石墨化程度。电化学测试结果表明，与商业20% Pt/C和Co-MA相比，Co-NC具有改善的传质过程和足够的活性位点暴露，这带来了优异的氧还原电催化活性、更高的还原电位（相对于Ag/AgCl为-0.2 V）、极限扩散电流（5.44 mA cm）以及在0.1 M KOH溶液中的优异稳定性。
