In situ synthesis of hierarchical MoSe2–CoSe2 nanotubes as an efficient electrocatalyst for the hydrogen evolution reaction in both acidic and alkaline media
In situ synthesis of hierarchical MoSe2–CoSe2 nanotubes as an efficient electrocatalyst for the hydrogen evolution reaction in both acidic and alkaline media
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DOI：
10.1039/c8ta01552j
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发表时间：
2018-05
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通讯作者：
Xinqiang Wang;Binjie Zheng;Bo Yu;Bo Wang;W. Hou;Wanli Zhang;Yuanfu Chen
中科院分区：
文献类型：
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作者：
Xinqiang Wang;Binjie Zheng;Bo Yu;Bo Wang;W. Hou;Wanli Zhang;Yuanfu Chen
采用水热硒化方法将CoMoO4纳米线（NWs）原位转化为多层MoSe2-CoSe2纳米管（MS-CS NTs）。作为电催化剂，MS-CS纳米管在析氢反应（HER）中表现出高效稳定的性能。在酸性（或碱性）介质中，MS-CS NTs表现出优异的HER性能，与RHE相比，起始过电位极低，为148（或127）mV，在- 10 mA cm - 2时过电位较低，为206（或237）mV，在- 300 mV（相对于RHE）时电流密度非常大，为84.6（或23.5）mA cm - 2， Tafel斜率小，为45（或89）mV dec - 1，长期循环稳定性显著。MS-CS纳米管在这两种介质中表现出优异的HER活性，这是由于其独特的分层和纳米孔结构，由少层MoSe2纳米片和CoSe2纳米颗粒均匀分布而成，这不仅可以有效抑制MoSe2纳米片的聚集，而且可以产生更多的活性位点或边缘来参与HER。此外，高导电性CoSe2纳米粒子均匀分散在多层MoSe2纳米片上，有效地促进了电子从电极向MoSe2纳米片上活性位点的转移，进一步提高了电催化性能。
Hierarchical MoSe2–CoSe2 nanotubes (MS–CS NTs) are in situ converted from the CoMoO4 nanowires (NWs) via a facile hydrothermal selenization method. As an electrocatalyst, MS–CS NTs show highly efficient and stable performance for the hydrogen evolution reaction (HER). In acidic (or alkaline) medium, MS–CS NTs demonstrate superior HER performance with a very low onset overpotential of 148 (or 127) mV vs. RHE, a low overpotential of 206 (or 237) mV vs. RHE at −10 mA cm−2, a very large current density of 84.6 (or 23.5) mA cm−2 at −300 mV (vs. RHE), a small Tafel slope of 45 (or 89) mV dec−1 and remarkable long-term cycling stability. The outstanding HER activity of MS–CS NTs in both media is attributed to their unique hierarchical and nanoporous architecture constructed with the homogeneous distribution of few-layered MoSe2 nanosheets and CoSe2 nanoparticles, which can not only efficaciously suppress the aggregation of MoSe2 nanosheets, but also generate more active sites or edges to take part in the HER. In addition, the uniform dispersion of highly conductive CoSe2 nanoparticles in few-layered MoSe2 nanosheets efficiently promotes the electron transfer from the electrode to the active sites on MoSe2 nanosheets, further improving the electrocatalytic properties.