铂炭催化脱除超级电容器用多孔炭含氧官能团  

Pt/C catalyst-aiding removal of the oxygen-containing functional groups on surfaces of porous carbons for supercapacitors

作　　者：韦江海 尹立坤 毕然 韩宇 杨婷 张亚楠 陈明鸣[1] WEI Jianghai;YIN Likun;BI Ran;HAN Yu;YANG Ting;ZHANG Yanan;CHEN Mingming(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Comprehensive Energy Research Center,Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China)

机构地区：[1]天津大学化工学院,天津300350 [2]中国长江三峡集团有限公司科学技术研究院综合能源技术研究中心,北京100038

出　　处：《化学工业与工程》2022年第6期83-92,共10页Chemical Industry and Engineering

基　　金：国家自然科学基金(22078228)。

摘　　要：开发可耐受高于2.7 V电压的多孔炭电极材料是双电层超级电容器(EDLCs)实现高能量密度的重要途径之一。以粒径小于10 nm的超细铂炭催化剂(Pt/C)引发了氢溢流,强化了高活性氢原子的解离,进而更加有效地脱除了多孔炭表面的含氧基团。利用5%Pt/C(质量分数,下同)可将多孔碳表面的含氧量降低至2%(摩尔分数,下同)。研究发现,重复使用多次后的Pt/C催化剂仍保持优于热还原法的脱氧效率。Pt/C催化剂作用下氢溢流脱氧后所得多孔炭(PC-Pt5/C-600-1st)的石墨微晶结构的有序度提高且孔结构得到较好保持,其作为EDLCs的电极材料可在3.3 V的高电压窗口下展现出良好的循环稳定性,在1 A·g^(-1)的电流密度下循环8 000圈后,容量保持率为88.4%。可重复使用的特点有利于降低相关工艺过程的成本负担。Developing porous carbon electrode materials that can withstand voltages higher than 2.7 V is one of the important ways to achieve high energy densities in double electric layer capacitors(EDLCs). In this work, an ultra-fine carbon-supported platinum(Pt/C) catalyst with a particle size of less than 10 nm was adopted to trigger hydrogen spillover, which enhanced the dissociation of highly active hydrogen atoms and thus more effectively removed the oxygen-containing groups from the surface of porous carbon. The oxygen content of the porous carbon surface can be reduced to less than 2% by using 5% Pt/C catalyst. It is found that the Pt/C catalyst maintains a better deoxygenation efficiency than that in the thermal reduction process after several repeated use. After the hydrogen spillover deoxygenation with Pt/C catalyst, the obtained porous carbon(PC-Pt5/C-600-1 st) presented more ordered graphitic microcrystalline structure and excellent retention of pore structure. Benefitting from the above characteristics, the EDLCs with PC-Pt5/C-600-1 st as electrode material presented a long-term cycling stability under a high voltage window of 3.3 V. The capacity retention rate of EDLCs is 88.4% after 8 000 cycles at a current density of 1 A·g^(-1). The reusable characteristic of Pt/C catalyst contributes to reduce the cost of the related production process.

关 键 词：超级电容器 含氧官能团 铂炭催化剂 氢溢流 多孔炭 高电压耐受 

分 类 号：TM53[电气工程—电器]