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Nickel@Nitrogen‐Doped Carbon@MoS2 Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction
Small ( IF 13.0 ) Pub Date : 2019-01-25 , DOI: 10.1002/smll.201804545 Sayyar Ali Shah 1 , Xiaoping Shen 1 , Minghua Xie 2 , Guoxing Zhu 1 , Zhenyuan Ji 1 , Hongbo Zhou 1 , Keqiang Xu 1 , Xiaoyang Yue 1 , Aihua Yuan 3 , Jun Zhu 1 , Yao Chen 1
Small ( IF 13.0 ) Pub Date : 2019-01-25 , DOI: 10.1002/smll.201804545 Sayyar Ali Shah 1 , Xiaoping Shen 1 , Minghua Xie 2 , Guoxing Zhu 1 , Zhenyuan Ji 1 , Hongbo Zhou 1 , Keqiang Xu 1 , Xiaoyang Yue 1 , Aihua Yuan 3 , Jun Zhu 1 , Yao Chen 1
Affiliation
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Developing cheap, abundant, and easily available electrocatalysts to drive the hydrogen evolution reaction (HER) at small overpotentials is an urgent demand of hydrogen production from water splitting. Molybdenum disulfide (MoS2) based composites have emerged as competitive electrocatalysts for HER in recent years. Herein, nickel@nitrogen‐doped carbon@MoS2 nanosheets (Ni@NC@MoS2) hybrid sub‐microspheres are presented as HER catalyst. MoS2 nanosheets with expanded interlayer spacings are vertically grown on nickel@nitrogen‐doped carbon (Ni@NC) substrate to form Ni@NC@MoS2 hierarchical sub‐microspheres by a simple hydrothermal process. The formed Ni@NC@MoS2 composites display excellent electrocatalytic activity for HER with an onset overpotential of 18 mV, a low overpotential of 82 mV at 10 mA cm−2, a small Tafel slope of 47.5 mV dec−1, and high durability in 0.5 H2SO4 solution. The outstanding HER performance of the Ni@NC@MoS2 catalyst can be ascribed to the synergistic effect of dense catalytic sites on MoS2 nanosheets with exposed edges and expanded interlayer spacings, and the rapid electron transfer from Ni@NC substrate to MoS2 nanosheets. The excellent Ni@NC@MoS2 electrocatalyst promises potential application in practical hydrogen production, and the strategy reported here can also be extended to grow MoS2 on other nitrogen‐doped carbon encapsulated metal species for various applications.
中文翻译：
镍@氮掺杂的碳@ MoS2纳米片：氢析出反应的高效电催化剂
开发廉价，丰富且易于获得的电催化剂以在较小的超电势下驱动氢释放反应（HER）是水分解制氢的迫切需求。近年来，基于二硫化钼（MoS 2）的复合材料已成为HER的竞争性电催化剂。在此，提出了镍掺杂氮的碳@MoS 2纳米片（Ni @ NC @ MoS 2）混合亚微球作为HER催化剂。通过简单的水热过程，将具有扩大的层间间距的MoS 2纳米片垂直生长在掺氮镍的碳（Ni @ NC）基底上，形成Ni @ NC @ MoS 2分层亚微球。形成的Ni @ NC @ MoS 2复合材料显示出出色的HER电催化活性，起始过电势为18 mV，在10 mA cm -2时低过电势为82 mV，Tafel斜率小，dec -1为47.5 mV ，在0.5 H 2 SO 4溶液中具有高耐久性。Ni @ NC @ MoS 2催化剂的出色HER性能可归因于致密催化位在具有暴露边缘和扩大的层间间距的MoS 2纳米片上的协同催化位点以及从Ni @ NC基底到MoS 2纳米片的快速电子转移的协同效应。。出色的Ni @ NC @ MoS 2电催化剂有望在实际的制氢中得到潜在的应用，此处报道的策略还可以扩展为在其他氮掺杂碳封装的金属物种上生长MoS 2，以用于各种应用。
更新日期：2019-01-25
中文翻译：
镍@氮掺杂的碳@ MoS2纳米片：氢析出反应的高效电催化剂
开发廉价，丰富且易于获得的电催化剂以在较小的超电势下驱动氢释放反应（HER）是水分解制氢的迫切需求。近年来，基于二硫化钼（MoS 2）的复合材料已成为HER的竞争性电催化剂。在此，提出了镍掺杂氮的碳@MoS 2纳米片（Ni @ NC @ MoS 2）混合亚微球作为HER催化剂。通过简单的水热过程，将具有扩大的层间间距的MoS 2纳米片垂直生长在掺氮镍的碳（Ni @ NC）基底上，形成Ni @ NC @ MoS 2分层亚微球。形成的Ni @ NC @ MoS 2复合材料显示出出色的HER电催化活性，起始过电势为18 mV，在10 mA cm -2时低过电势为82 mV，Tafel斜率小，dec -1为47.5 mV ，在0.5 H 2 SO 4溶液中具有高耐久性。Ni @ NC @ MoS 2催化剂的出色HER性能可归因于致密催化位在具有暴露边缘和扩大的层间间距的MoS 2纳米片上的协同催化位点以及从Ni @ NC基底到MoS 2纳米片的快速电子转移的协同效应。。出色的Ni @ NC @ MoS 2电催化剂有望在实际的制氢中得到潜在的应用，此处报道的策略还可以扩展为在其他氮掺杂碳封装的金属物种上生长MoS 2，以用于各种应用。
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