Nie Kunkun, Qu Xiaoyan, Gao Dongwei, Li Binjie, Yuan Yanling, Liu Qi, Li Xinghua, Chong Shaokun, Liu Zhengqing
Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics (IFE), Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, Xi'an 710129, China.
Frontier Institute of Science and Technology, State Key Laboratory for Manufacturing Systems Engineering, Xian Jiaotong University, Xi'an 710049, China.
ACS Appl Mater Interfaces. 2022 May 4;14(17):19847-19856. doi: 10.1021/acsami.2c01358. Epub 2022 Apr 20.
1T'-phase MoS possesses excellent electrocatalytic performance, but due to the instability of the thermodynamic metastable phase, its actual electrocatalytic effect is seriously limited. Here, we report a wet-chemical synthesis strategy for constructing rGO/1T'-MoS/CeO heterostructures to improve the phase stability of metastable 1T' phase MoS monolayers. Importantly, the rGO/1T'-MoS/CeO heterostructure exhibits excellent electrocatalytic hydrogen evolution reaction (HER) performance, which is much better than the 1T'-MoS monolayers. The synergistic effects between CeO nanoparticles (NPs) and 1T'-MoS monolayers were systematically investigated. 1T'-MoS monolayers combined with the cocatalyst of CeO NPs can produce lattice strain and distortion on 1T'-MoS monolayers, which can tune the energy band structure, charge transfer, and energy barriers of hydrogen atom adsorption (Δ), leading to promotion of the phase activity and stability of 1T'-MoS monolayers for hydrogen production. Our work offers a feasible method for the preparation of efficient HER electrocatalysts based on the engineering phase stability of metastable materials.
1T'相的二硫化钼具有优异的电催化性能，但由于热力学亚稳相的不稳定性，其实际电催化效果受到严重限制。在此，我们报道了一种湿化学合成策略，用于构建还原氧化石墨烯/1T'-二硫化钼/二氧化铈异质结构，以提高亚稳1T'相二硫化钼单层的相稳定性。重要的是，还原氧化石墨烯/1T'-二硫化钼/二氧化铈异质结构表现出优异的电催化析氢反应（HER）性能，远优于1T'-二硫化钼单层。系统研究了二氧化铈纳米颗粒（NPs）与1T'-二硫化钼单层之间的协同效应。1T'-二硫化钼单层与二氧化铈NPs助催化剂结合可在1T'-二硫化钼单层上产生晶格应变和畸变，这可以调节能带结构、电荷转移以及氢原子吸附的能垒（Δ），从而促进1T'-二硫化钼单层产氢的相活性和稳定性。我们的工作为基于亚稳材料的相稳定性工程制备高效HER电催化剂提供了一种可行的方法。
