Self-supported molybdenum selenide nanosheets grown on urchin-like cobalt selenide nanowires array for efficient hydrogen evolution

Self-supported molybdenum selenide nanosheets grown on urchin-like cobalt selenide nanowires array for efficient hydrogen evolution
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在海胆状硒化钴纳米线阵列上生长的自支撑硒化钼纳米片可有效析氢

DOI:
10.1016/j.ijhydene.2020.03.017
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发表时间:
2020-05
影响因子:
7.2
通讯作者:
Liu Wei
Liu Wei
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Yuqiao Jian Chuanyong He Xu;Liu Wei

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开发高效的复合催化剂是水裂解制氢的理想选择。MoSe 2是一种低成本的候选材料,但由于其电导率低,与电荷收集基底的电接触性差,其析氢反应活性仍不令人满意。在此,我们提供了一种简单的方法来合成垂直排列的MoSe 2纳米片的海胆状HER活性导电CoSe 2纳米线阵列。纳米结构的MoSe 2/CoSe 2杂化催化剂在仅129 mV的过电位下获得了10 mA cm− 2的电流密度,具有38.2 mV dec−1的小塔菲尔斜率,这比大多数过渡金属二硫属化物(MoSe 2、MoSe 2-CoSe 2杂化物等)的电流密度要高上级。MoSe 2丰富的暴露活性位点,以及MoSe 2纳米片和CoSe 2纳米线之间有效的电接触,有利于MoSe 2/CoSe 2混合电极出色的HER性能。
The development of a highly efficient hybrid catalyst is desirable for the water splitting to produce hydrogen. MoSe2is one of the low-cost candidates; however, its activity for hydrogen evolution reaction (HER) is still not satisfactory due to the low conductivity and poor electrical contact with the charge collection substrate. Herein, we provide a simple approach of synthesizing vertically aligned MoSe2nanoplatelets on the urchin-like HER-active conductive CoSe2nanowire array. Nanostructured MoSe2/CoSe2hybrid catalysts obtained a current density of 10 mA cm−2at overpotentials of only 129 mV, with a small Tafel slope of 38.2 mV dec−1, which is superior to those of most transition metal dichalcogenides (MoSe2, MoSe2–CoSe2hybrids, and so on). The abundant exposed active sites of MoSe2, as well as an efficient electrical contact between MoSe2nanosheets and CoSe2nanowires, which is beneficial for the outstanding HER performance of MoSe2/CoSe2hybrid electrode.
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