4.7 Article

New strategy to synthesize optimal cobalt diselenide@hollow mesoporous carbon nanospheres for highly efficient hydrogen evolution reaction

期刊

CHEMICAL ENGINEERING JOURNAL
卷 424, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130341

关键词

Cobalt diselenide; Hollow carbon nanosphere; Electrocatalyst; Nanostructure; Hydrogen evolution reaction

资金

  1. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A2C2088047, 2020R1A4A2002854]
  2. National Research Foundation of Korea [2020R1A4A2002854] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

The control of crystal size and location of cobalt diselenide in hollow mesoporous carbon nanospheres, as well as the phase properties tuning, significantly enhance the performance in the hydrogen evolution reaction.
Cobalt diselenide (CoSe2) has been considered as a prospective hydrogen evolution reaction (HER) catalyst due to its good electrocatalytic activity and chemical stability under acidic conditions. In this regard, various strategies for effectively utilizing CoSe2 as an electrocatalyst have been introduced. However, to the best of our knowledge, the development of new strategies for the formation of cobalt diselenide with small crystal sizes within carbon substrates, as well as facilitating phase-controlling method to improve HER properties, has been rarely reported. Herein, we propose a new method that can control the location and crystal size of cobalt diselenide nanocrystals in hollow mesoporous carbon nanospheres (HC) by a facile impregnation method and one-step selenization process. In particular, the co-addition of cobalt nitrate and SeO2 into HC plays an important role in preventing cobalt diselenide particles from protruding to the outside of the HC by an immediate chemical reaction in the inner void of HC. Interestingly, by controlling the amount of impregnated SeO2 in HC, phase-controlling from the orthorhombic to cubic phase at the same heat treatment temperature is achieved. The optimized polymorphic CoSe2 loaded in HC exhibited a much higher HER performance, with a Tafel slope of 45.7 mV per decade (dec(-1)), than orthorhombic CoSe2 loaded in HC (53.9 mV dec(-1)) and cubic CoSe2 loaded in HC (50.8 mV dec(-1)). The synergistic effects of the crystal size and location of CoSe2 in the HC and its phase properties contribute to the outstanding HER performance.

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。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据