Liu Xuexia, Liu Limin, Wu Ying, Wang Yinfeng, Yang Jinhu, Wang Zhijun
School of Chemistry and Chemical Engineering, Jinggangshan University Ji'an Jiangxi 343009 PR China
School of Chemical Science and Engineering, Tongji University Shanghai 200092 PR China.
RSC Adv. 2019 May 3;9(24):13820-13828. doi: 10.1039/c9ra01111k. eCollection 2019 Apr 30.
MoS is regarded as one of the cost-effective materials for many important applications. In this work, we report a simple one-step hydrothermal method for the directed synthesis of a rosette-like MoS nanoflower modified electrode without using adhesion agents. Interestingly, owing to the hierarchical structures, the as-prepared MoS-based electrode exhibits significantly enhanced performance for both the hydrogen evolution reaction in acidic environments and supercapacitors. When used in the hydrogen evolution reaction, the electrode shows a low overpotential of ∼0.25 V at 10 mA cm, a Tafel slope of ∼71.2 mV per decade, and long-term durability over 20 h of hydrogen evolution reaction operation at 10 mV cm. In addition, as a supercapacitor electrode, it exhibits a good capacity of 137 mF cm at a current density of 10 mA cm and excellent stability in 1 M HSO at a scan rate of 50 mV s. The outstanding performances of the as-prepared materials may be ascribed to the unique 3D architectures of the rosette-like MoS nanoflowers. This work could provide a strategy to explore low-cost and highly efficient electrocatalysts with desired nanostructures for the hydrogen evolution reaction and supercapacitors applications.
硫化钼（MoS）被认为是许多重要应用中具有成本效益的材料之一。在这项工作中，我们报道了一种简单的一步水热法，用于在不使用粘合剂的情况下直接合成玫瑰花状MoS纳米花修饰电极。有趣的是，由于其分层结构，所制备的基于MoS的电极在酸性环境中的析氢反应和超级电容器方面均表现出显著增强的性能。当用于析氢反应时，该电极在10 mA cm时显示出约0.25 V的低过电位，塔菲尔斜率约为每十倍频程71.2 mV，并且在10 mV cm下进行20小时以上的析氢反应操作具有长期耐久性。此外，作为超级电容器电极，它在10 mA cm的电流密度下表现出137 mF cm的良好电容，并且在1 M HSO中以50 mV s的扫描速率具有出色的稳定性。所制备材料的优异性能可能归因于玫瑰花状MoS纳米花独特的三维结构。这项工作可为探索用于析氢反应和超级电容器应用的具有所需纳米结构的低成本、高效电催化剂提供一种策略。
