塔菲尔方程
析氧
煅烧
硒化物
过电位
催化作用
材料科学
碳纳米管
化学工程
钴
电化学
电催化剂
纳米技术
碳纤维
化学
电极
复合数
复合材料
有机化学
冶金
物理化学
硒
工程类
作者
Menglei Yuan,Meng Wang,Peilong Lu,Yu Sun,Sobia Dipazir,Jingxian Zhang,Shuwei Li,Guangjin Zhang
标识
DOI:10.1016/j.jcis.2018.08.104
摘要
The electrochemical oxygen evolution reaction (OER) is sparked extensive interest in efficient energy storage and conversion. Cobalt Selenide (CoSe2) is believed to be one of the promising candidates for OER based on Yang Shao-Horn's principle. However, owing to low exposure of active sites and/or low efficiency of electron transfer, the electrocatalytic activity of CoSe2 is far less than expected. In this work, a novel carbon nanotubes (CNT) grafted 3D core-shell structured CoSe2@C-CNT nanohybrid is developed by a general hydrothermal-calcination strategy. Zeolite imidazole frameworks (ZIF) was used as the precursor to synthesis of the materials. It is found that both the calcination temperature and the selenium content can significantly regulate the catalytic performance of the hybrids. The obtained best catalysts requires the overpotential of only 306 mV and 345 mV to reach a current density of 10 mA cm-2 and 50 mA cm-2 in 1.0 MKOH medium, respectively. It also exhibits a small Tafel slope of 46 mV dec-1 and excellent durability, which is superior to most of recently reported CoSe2-based and Co-based materials. These superior performances can be ascribed to synergistic effects of the highly active CoSe2 nanostructure, defect carbon species and the carbon nanotubes exist in the catalyst. Besides, the unique morphology leads to large electrochemical surface area of the catalyst, which is in favor of the exposure of active sites for OER. Due to high efficiency, low cost and excellent durability for OER, the prepared catalysts showed can be potentially used to substitute noble metals utilized in related energy storage and conversion devices.
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