Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, P. R. China.
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China.
Chem Asian J. 2018 Jun 4;13(11):1438-1446. doi: 10.1002/asia.201800003. Epub 2018 May 14.
Two-dimensional transition-metal dichalcogenides have been widely studied as electrocatalysts for the hydrogen evolution reaction (HER). However, limited active sites and poor conductivity hinder their application. To solve these disadvantages, heteroatom doping has attracted wide attention because it can not only increase the active sites but also affect the intrinsic catalytic properties of the electrocatalyst. Herein, we grew vanadium-doped WS nanosheets on carbon cloth (V-WS /CC) as an electrocatalyst for HER under acidic and alkaline conditions. With a proper vanadium doping concentration, the electrochemical surface areas of V -WS /CC were 9.6 and 2.6 times as large as that of pure WS electrocatalyst under acidic and alkaline conditions, respectively. In addition, the charge-transfer resistance also decreased with moderate vanadium doping. Based on this, the synthesized vanadium-doped WS nanosheets exhibited good stability with high HER catalytic activity and could reach a current density of 10 mA cm at overpotentials of 148 and 134 mV in 0.5 m H SO and 1 m KOH, respectively. The corresponding Tafel slopes were 71 and 85 mV dec . Therefore, our synthesized vanadium-doped WS nanosheets can be a promising electrocatalyst for the production of hydrogen over a wide pH range.
二维过渡金属二硫属化物已被广泛研究作为析氢反应（HER）的电催化剂。然而，有限的活性位点和较差的导电性限制了它们的应用。为了解决这些缺点，杂原子掺杂引起了广泛的关注，因为它不仅可以增加活性位点，还可以影响电催化剂的固有催化性质。在此，我们在碳布上生长了钒掺杂的 WS 纳米片（V-WS/CC）作为酸性和碱性条件下 HER 的电催化剂。在适当的钒掺杂浓度下，V-WS/CC 的电化学表面积在酸性和碱性条件下分别是纯 WS 电催化剂的 9.6 和 2.6 倍。此外，随着适度的钒掺杂，电荷转移电阻也降低了。基于此，合成的钒掺杂 WS 纳米片表现出良好的稳定性，具有高的 HER 催化活性，在 0.5 m H2SO4 和 1 m KOH 中，过电位分别为 148 和 134 mV 时，电流密度可达到 10 mA cm-2。相应的塔菲尔斜率分别为 71 和 85 mV dec-1。因此，我们合成的钒掺杂 WS 纳米片可以作为在宽 pH 范围内生产氢气的有前途的电催化剂。
