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

化学工业与工程

Chemcial Industry and Engineering

2022, Vol. 39

Issue (6) :83-92 DOI: 10.13353/j.issn.1004.9533.20220318

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

WEI Jianghai¹, YIN Likun², BI Ran², HAN Yu², YANG Ting¹, ZHANG Yanan¹, CHEN Mingming¹

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. Comprehensive Energy Research Center, Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China

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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.

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	WEI Jianghai
	YIN Likun
	BI Ran
	HAN Yu
	YANG Ting
	ZHANG Yanan
	CHEN Mingming

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

Received 2022-04-12;

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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,V39(6): 83-92

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