Yuan Liang, Zhang Yingmeng, Chen Jinhong, Li Yongliang, Ren Xiangzhong, Zhang Peixin, Liu Liwei, Zhang Jinxiang, Sun Lingna
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, P. R. China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, Guangdong, P. R. China.
Nanoscale. 2022 Feb 10;14(6):2490-2501. doi: 10.1039/d1nr05941f.
Although the design and synthesis of efficient electrocatalysts for the hydrogen evolution reaction (HER) are highly desirable, severe challenges still need to be addressed. Herein, ultrathin MoS nanosheets were vertically grown on CoSe hollow nanotube arrays a simple three-step hydrothermal reaction by using carbon cloth (CC) as a substrate and were subsequently used as a highly efficient HER electrocatalyst (MoS@CoSe-CC hybrid). The MoS nanosheets uniformly self-assembled on conductive CoSe nanotube arrays exhibited a hierarchical and well-ordered structure. Such a unique structure may not only comprise more exposed active sites, but also enable fast electrolyte penetration and facilitate H/electron transportation to accelerate the reduction and evolution of H during the electrocatalytic process. As an HER electrocatalyst with a novel three-dimensional hierarchical structure, the MoS@CoSe-CC hybrid exhibited an outstanding catalytic HER performance with a small Tafel slope of 67 mV dec in alkaline media, while only requiring a low HER overpotential of 101 mV at 10 mA cm. Notably, the MoS@CoSe-CC hybrid also demonstrated exceptional electrochemical durability and structural stability even after 1000 cycles or 48 h of continuous electrolysis. Overall, this work presents a new approach for the design and synthesis of robust, highly active, and cost-effective electrocatalysts for hydrogen generation.
尽管高效析氢反应（HER）电催化剂的设计与合成备受期待，但仍需应对严峻挑战。在此，通过简单的三步水热反应，以碳布（CC）为基底，在CoSe空心纳米管阵列上垂直生长出超薄MoS纳米片，并将其用作高效HER电催化剂（MoS@CoSe-CC杂化物）。均匀自组装在导电CoSe纳米管阵列上的MoS纳米片呈现出分层且有序的结构。这种独特结构不仅可能包含更多暴露的活性位点，还能使电解质快速渗透，并促进H/电子传输，从而在电催化过程中加速H的还原与析出。作为一种具有新型三维分层结构的HER电催化剂，MoS@CoSe-CC杂化物在碱性介质中表现出出色的HER催化性能，Tafel斜率小至67 mV dec，在10 mA cm时仅需101 mV的低HER过电位。值得注意的是，即使经过1000次循环或48小时连续电解，MoS@CoSe-CC杂化物仍表现出优异的电化学耐久性和结构稳定性。总体而言，这项工作为设计和合成用于制氢的坚固、高活性且经济高效的电催化剂提供了一种新方法。
