塔菲尔方程
过电位
石墨烯
析氧
催化作用
氧化物
材料科学
化学工程
电化学
无机化学
化学
纳米技术
电极
物理化学
冶金
有机化学
工程类
作者
Panpan Li,Zhaoyu Jin,Dan Xiao
出处
期刊:Journal of materials chemistry. A, Materials for energy and sustainability
[The Royal Society of Chemistry]
日期:2014-09-11
卷期号:2 (43): 18420-18427
被引量:99
摘要
Two-dimensional (2D) nanocomposites are fabricated on reduced graphene oxide (Co–P–B/rGO) via a one-step method at room temperature. By tuning the molar ratio of phosphorus and boron sources in reactants, outstanding bi-functional catalysts for the oxygen evolution reaction (OER) can be obtained with an extremely low onset overpotential of 50 mV and a small Tafel slope of 68 mV dec−1, as well as for the hydrogen evolution reaction (HER) with onset overpotential of 168 mV and a Tafel slope of 82 mV dec−1 in neutral solution (pH = 7.0). The improved performance could be due to the high specific area, efficient electron transfer and the synergistic effects of P and B. We also tested these catalysts in seawater for both OER and HER, which showed favorable activities. This approach to form 2D structures on a reduced graphene oxide may inspire the development of more extraordinary electrochemical catalysts and devices.
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