铂炭催化脱除超级电容器用多孔炭含氧官能团

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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。

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	韦江海
	尹立坤
	毕然
	韩宇
	杨婷
	张亚楠
	陈明鸣

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

Abstract： 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-600-1st) presented more ordered graphitic microcrystalline structure and excellent retention of pore structure. Benefitting from the above characteristics, the EDLCs with PC-Pt5/C-600-1st 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.

Keywords： supercapacitors oxygen-containing functional groups Pt/C catalyst hydrogen spillover porous carbon high voltage withstanding

Received 2022-04-12;

Fund:国家自然科学基金（22078228）。

Corresponding Authors: 陈明鸣,教授,E-mail:chmm@tju.edu.cn。 Email: chmm@tju.edu.cn

About author: 韦江海(1998-),男,硕士研究生,现从事化学电源方面的研究。

引用本文:

韦江海, 尹立坤, 毕然, 韩宇, 杨婷, 张亚楠, 陈明鸣.铂炭催化脱除超级电容器用多孔炭含氧官能团[J]. 化学工业与工程, 2022,39(6): 83-92

WEI Jianghai, YIN Likun, BI Ran, HAN Yu, YANG Ting, ZHANG Yanan, CHEN Mingming.Pt/C catalyst-aiding removal of the oxygen-containing functional groups on surfaces of porous carbons for supercapacitors[J]. Chemcial Industry and Engineering, 2022,39(6): 83-92

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