全pH范围下MoS2/Ni3S2/NF的高效电催化析氢行为

Highly efficient electrocatalytic hydrogen evolution behavior of MoS2/Ni3S2/NF at all-pH range

摘要:

在全pH（0~14）范围下设计开发低廉、高活性的析氢电催化剂对新能源开发和利用具有重要实际意义。通过简单的溶剂热法在镍网（NF）上原位构筑了纳米线结构MoS2/Ni3S2/NF电催化剂，该催化剂在全PH范围下表现出优异的析氢（HER）活性。电化学测试结果表明，使用41 mg四硫代钼酸铵制得的MoS2/Ni3S2/NF-41电极,在电流密度10 mA/cm2时，其在碱性（1 moL/L KOH，pH=14）、中性（0.5 moL/L PBS，pH=7）和酸性（0.5 moL/L H2SO4，pH=0）介质中HER过电位分别为87、113和195 mV，并相应表现出较低的Tafel斜率。另外，SEM、TEM、EDX、XPS等表征手段表明该催化剂具有良好的结构稳定性。本研究为过渡金属硫化物在全pH环境下高效析氢提供了新途径。

Abstract:

It is of great practical significance to design and develop low-cost and high activity hydrogen evolution electrocatalysts in the all-pH (0~14) range for the development and utilization of new energy. Nanowire structured MoS2/Ni3S2/NF electrocatalysts were in situ constructed on nickel mesh (NF) by a simple solvothermal method, which exhibited excellent hydrogen evolution (HER) activity in the all-pH range. The electrochemical test results show that the MoS2/Ni3S2/NF-41 electrode prepared with 41 mg ammonium tetrathiomolybdate has a HER overpotential of 87, 113 and 195 mV in alkaline (1 moL/L KOH, pH=14), neutral (0.5 moL/L PBS, pH=7) and acidic (0.5 moL/L H2SO4, pH=0) media at a current density of 10 mA/cm2, and exhibits a lower Tafel slope. In addition, SEM, TEM, EDX, XPS and other characterization methods show that the catalyst has good structural stability. This study provides a new way for efficient hydrogen evolution of transition metal sulfides in a all-pH environment.