Efficiently enhancing oxygen reduction electrocatalytic activity of MnO2 using facile hydrogenation

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题名:	Efficiently enhancing oxygen reduction electrocatalytic activity of MnO2 using facile hydrogenation
作者:	鄭芳怡;Zhang, Tianran;Cheng, Fangyi;Du, Jing;Hu, Yuxiang;Chen, Jun
贡献者:	地球科學學院大氣科學學系
关键词:	Aqueous solutions;electrocatalysis;Fuel cells;hydrogenation;manganese oxides;Metal oxides;Oxygen;oxygen reduction reaction
日期:	2015-01-01
上传时间:	2026-04-21 14:00:23 (UTC+8)
出版者:	Wiley-VCH Verlag;Weinheim: Blackwell Publishing Ltd
摘要:	摘要： Improving the electrocatalytic oxygen reduction reaction (ORR) activity of transition metal oxides is important for the development of non‐noble metal catalysts that are used in metal‐air batteries and fuel cells. Here, a novel facile strategy of hydrogenation to significantly enhance the ORR performance of MnO2. The hydrogenated MnO2 (H‐MnO2), which is prepared through a simple heat treatment in hydrogen gas, shows characteristics of modified lattice/surface structures and increased electrical conductivity. In 0.1 M KOH aqueous solution, the prepared H‐MnO2 exhibits high activity toward the oxygen electrocatalysis with more positive onset potential (≈60 mV), ≈14% larger of limiting current, lower yield of peroxide species, and better durability than the pristine oxide. Further conductivity testing and density functional theory (DFT) studies reveal the faster kinetics of ORR after hydrogenation is due to the formation of hydrogen bonds and altered microstructure and improved electronic properties. These results highlight the importance of hydrogenation as a facile yet effective strategy to improve the catalytic activity of transition metal oxides for ORR‐based applications. Hydrogenation is a novel, facile and efficient strategy to enhance the catalytic activity of MnO 2 for oxygen reduction reactions (ORR). Compared to pristine MnO2, the prepared catalyst exhibits much enhanced activity as a result of modified microstructure, improved electronic properties, and enhanced oxygen activation due to the formation of hydrogen bonds. 其他題名： Adv. Energy Mater 出版者： Weinheim: Blackwell Publishing Ltd 出版日期： 2015-01-01 出處： Advanced energy materials, 2015-01, Vol.5 (1), p.n/a 版權： 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim 版權： Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 識別號： ISSN: 1614-6832 識別號： EISSN: 1614-6840 識別號： DOI: 10.1002/aenm.201400654
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