期刊
CHEMCATCHEM
卷 11, 期 6, 页码 1665-1672出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201900055
关键词
Mn3O4; nanoparticles; electrocatalysts; methylamine; water oxidation; surface deprotonation
资金
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF2017 M3D1 A1039377]
- Global Frontier R&D Program of the Center for Multiscale Energy System - National Research Foundation under the Ministry of Science and ICT, Korea [2012 M3 A6 A7054855]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [NRF2017R1 A2B3012003]
- POSCO
Electrochemical water splitting is one of the most important ways to produce hydrogen fuel for an environmentally friendly energy system. Low-cost and efficient electrocatalysts for oxygen evolution reaction (OER) have been studied to overcome the sluggish kinetics of OER, which is considered to be a bottleneck that affects the overall efficiency of water splitting. However, the atomic-level understanding and control of the catalyst surface still remains elusive. Here, we show that methylamine treatment of manganese oxide nanoparticles can effectively control their surface charge and enhance their OER catalytic activity under neutral condition. Methylamine treatment can reduce the overpotential for OER by nearly 100 mV at the current density 5 mA cm(-2). Through spectroscopic studies, potentiometric titration, and zeta potential analysis, we discovered that methylamine does not exist on the surface after methylamine treatment but deprotonates the surface of nano-particles and induce additional negative charge on the surface. Surprisingly, treatment with not only methylamine but other amines can also improve the OER performance and the catalytic activity of the amine treated nanoparticles is influenced by the pK(a) values of amines.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据