Tween20 surfactant effect on the electrocatalytic performance of porous carbon micro-spheres supported MnO2

Tween20 surfactant effect on the electrocatalytic performance of porous carbon micro-spheres supported MnO2
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Tween20表面活性剂对多孔碳微球负载MnO2电催化性能的影响

DOI:
10.1039/c4ra09169h
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发表时间:
2014-10
期刊:
影响因子:
3.9
通讯作者:
Wang Hong-Qiang
Wang Hong-Qiang
中科院分区:
化学3区
文献类型:
--
作者:
Li Qing-Yu;Wu Yong-Sheng;Zhang Xiao-Hui;Huang You-Guo;Wu Qiang;Wang Hong-Qiang

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研究了聚氧乙烯失水山梨醇单月桂酸酯(Tween 20)修饰的多孔碳微球(PCS)负载的MnO 2催化剂在0.1M KOH溶液中的电催化析氧性能。Super P(SP)的加入提高了催化剂的电导率。电化学测试结果表明,Tween 20修饰后MnO 2/PCS对析氧反应的电催化活性显著增强。Tween 20修饰的MnO 2/PCS颗粒电极的OER的起始电位比裸(即未修饰的)MnO 2/PCS电极更负约0.162 V。Tween 20吸附在MnO 2/PCS颗粒表面,均匀地覆盖了整个MnO 2/PCS颗粒表面。Tween 20作为催化介体起着至关重要的作用,其在水氧化成分子氧期间促进离子转移,从而在较小的正电位下实现OER。
This study is concerned with the electrocatalytic evolution of oxygen at polyoxyethylene sorbitan monolaurate (Tween20) modified porous carbon micro-spheres (PCS) supported MnO2 catalyst in 0.1 M KOH solution. The Super P (SP) was used to improve the electrical conductivity of the catalyst. The electrochemical measurements revealed a significant enhancement of the electrocatalytic activity of the MnO2/PCS towards the oxygen evolution reaction (OER) upon the Tween20 modification. The onset potentials of the OER at the Tween20 modified MnO2/PCS particles electrode are more negative by about 0.162 V compared with the bare (i.e. unmodified) MnO2/PCS electrode. Tween20 is absorbed on the surface of MnO2/PCS and covers the entire surface of the MnO2/PCS particles homogeneously. The Tween20 plays a vital role as a catalytic mediator, which facilitates the ion transfer during the water oxidation into molecular oxygen and thus the OER is accomplished at less positive potentials.
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