Singh Ashwani Kumar, Prasad Jagdees, Azad Uday Pratap, Singh Ashish Kumar, Prakash Rajiv, Singh Kedar, Srivastava Amit, Alaferdov Andrei A, Moshkalev Stanislav A
Center for Semiconductor and Nanotechnology Components, UNICAMP SP Brazil
School of Physical Sciences, Jawaharlal Nehru University New Delhi India.
RSC Adv. 2019 Jul 17;9(39):22232-22239. doi: 10.1039/c9ra03589c.
In this paper, we demonstrate a facile solvothermal synthesis of a vanadium(v) doped MoS-rGO nanocomposites for highly efficient electrochemical hydrogen evolution reaction (HER) at room temperature. The surface morphology, crystallinity and elemental composition of the as-synthesized material have been thoroughly analyzed. Its fascinating morphology propelled us to investigate the electrochemical performance towards the HER. The results show that it exhibits excellent catalytic activity with a low onset potential of 153 mV reversible hydrogen electrode (RHE), a small Tafel slope of 71 mV dec, and good stability over 1000 cycles under acidic conditions. The polarization curve after the 1000 cycle suggests there has been a decrement of less than 5% in current density with a minor change in onset potential. The synergistic effects of V-doping at S site in MoS NSs leading to multiple active sites and effective electron transport route provided by the conductive rGO contribute to the high activity for the hydrogen evolution reaction. The development of a high-performance catalyst may encourage the effective application of the as-synthesized V-doped MoS-rGO as a promising electrocatalyst for hydrogen production.
在本文中，我们展示了一种简便的溶剂热合成方法，用于制备钒（V）掺杂的MoS-rGO纳米复合材料，以在室温下实现高效的电化学析氢反应（HER）。对合成材料的表面形态、结晶度和元素组成进行了全面分析。其迷人的形态促使我们研究其对HER的电化学性能。结果表明，它表现出优异的催化活性，相对于可逆氢电极（RHE）的低起始电位为153 mV，塔菲尔斜率为71 mV dec，并且在酸性条件下经过1000次循环具有良好的稳定性。1000次循环后的极化曲线表明，电流密度下降小于5%，起始电位有微小变化。MoS纳米片中S位点的V掺杂产生的协同效应导致多个活性位点，以及导电rGO提供的有效电子传输途径，有助于析氢反应的高活性。高性能催化剂的开发可能会促进所合成的V掺杂MoS-rGO作为一种有前景的制氢电催化剂的有效应用。
