Yu Xiaoxia, Li Lihong, Chen Binda, Qian Cuncun, Li Zheng, Su Meng, Song Yanlin, Xing Xianran
Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, 100083, Beijing, China.
Key Laboratory of Green Printing, Chinese Academy of Sciences, 100190, Beijing, China.
Chem Asian J. 2020 Jul 1;15(13):1990-1995. doi: 10.1002/asia.202000338. Epub 2020 May 18.
As an electrocatalyst with abundant resources and great potential, molybdenum disulfide is regarded as one of the most likely alternatives to expensive noble-metals catalysts. However, it is still a challenge to achieve large scale production of few-layer MoS with enhancing activity of electrocatalytic hydrogen reaction at ambient conditions. Herein, we developed a simple environmentally friendly two-step method, which included intercalation reaction and a subsequent electrochemical reduction reaction for mass preparation of defect-rich desulfurized MoS (D-MoS ) nanosheets with plentiful sulfur vacancies. The ratio of sulfur-molybdenum atoms can be adjusted from 2 : 1 to 1.4 : 1 by regulating the desulfurization voltage. It was found that the HER catalytic activity of the D-MoS was enhanced compared with that of pristine MoS (P-MoS ), the current density of D-MoS (desulfurization at -1.0 V) at -0.3 V versus RHE was about 169% of the P-MoS , and the Tafel slope decreased to 136 mV dec . This method can be widely applied to large-scale preparation of other two-dimensional materials.
作为一种资源丰富且潜力巨大的电催化剂，二硫化钼被视为最有可能替代昂贵贵金属催化剂的材料之一。然而，在环境条件下实现具有增强电催化氢反应活性的少层MoS₂的大规模生产仍然是一个挑战。在此，我们开发了一种简单的环境友好型两步法，该方法包括插层反应和随后的电化学还原反应，用于大规模制备具有大量硫空位的富含缺陷的脱硫MoS₂（D-MoS₂）纳米片。通过调节脱硫电压，硫钼原子比可从2∶1调整为1.4∶1。研究发现，与原始MoS₂（P-MoS₂）相比，D-MoS₂的HER催化活性得到增强，相对于RHE，D-MoS₂（在-1.0 V下脱硫）在-0.3 V时的电流密度约为P-MoS₂的169%，塔菲尔斜率降至136 mV dec⁻¹。该方法可广泛应用于其他二维材料的大规模制备。
