Porous interwoven CoSe2/C microsphere: a highly efficient and stable nonprecious electrocatalyst for hydrogen evolution reaction
Porous interwoven CoSe2/C microsphere: a highly efficient and stable nonprecious electrocatalyst for hydrogen evolution reaction
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DOI：
10.1007/s10853-019-03881-2
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发表时间：
2019-08
影响因子：
4.5
通讯作者：
H. Yue;Dongxu Yang;Bo Yu;Yingjiong Lu;Wanli Zhang;Yuanfu Chen
中科院分区：
文献类型：
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作者：
H. Yue;Dongxu Yang;Bo Yu;Yingjiong Lu;Wanli Zhang;Yuanfu Chen
首次通过简单的溶剂热法合成了超薄CoSe2和碳纳米片交织的多孔CoSe2/C微球。与裸CoSe2相比，CoSe2/C杂化物表现出更好的析氢反应（HER）性能：该杂化物表现出Tafel机制，而不是CoSe2的Heyrovsky机制；它具有低起始电位（− 189 mV vs RHE）和超低塔菲尔斜率（34 mV dec−1）；等电位时电流密度增加2.5倍以上；即使在 1000 次循环后，该混合动力系统也表现出卓越的长期稳定性。从根本上来说，CoSe2/C优异的HER性能源于其独特的多孔微球，由超薄CoSe2纳米片和导电碳纳米片交织而成，不仅有利于电子转移和离子扩散，而且还能产生丰富的HER电催化活性位点。这种简便且可扩展的合成方法可以扩展到合成具有独特纳米结构和出色的 HER 性能的非贵重过渡金属催化剂。
For the first time, a porous CoSe2/C microsphere interwoven by ultrathin CoSe2and carbon nanosheets is synthesized by a simple solvothermal method. Compared with bare CoSe2, the CoSe2/C hybrid exhibits much better performance for hydrogen evolution reaction (HER): The hybrid demonstrates a Tafel mechanism rather than the Heyrovsky mechanism of CoSe2; it has a low onset potential (− 189 mV vs RHE) and an ultra-low Tafel slope (34 mV dec−1); current density increases by more than 2.5 times at equipotential; the hybrid also exhibits remarkable long-term stability even after 1000 cycles. At root, the superior HER performance of CoSe2/C stems from its unique porous microsphere intertwined by ultrathin CoSe2nanosheets and conductive carbon nanosheets, which not only facilitate the electron transfer and ion diffusion, but also produce abundant electrocatalytic active sites for HER. This facile and scalable synthetic method can be extended to synthesize nonprecious transition-metal-based catalysts with unique nanoarchitecture and outstanding HER performance.