Synthesis of <scp> MoS <sub>x</sub> </scp> /Ni‐metal‐organic framework‐74 composites as efficient electrocatalysts for hydrogen evolution reactions
Ha Huu, Quyet Van Le, Tuan Van Nguyen, Kim Anh Huynh, Mahider Tekalgne, Vy Anh Tran, Tae Hyung Lee, Jin Hyuk Cho, Mohammadreza Shokouhimehr, Sang Hyun Ahn, Ho Won Jang, Soo Young Kim
Abstract
The development of low-cost and stable materials presents a challenging task for the electrocatalytic hydrogen evolution reaction (HER). In this work, we developed a facile strategy to fabricate efficient catalysts by incorporating amorphous molybdenum sulfide (MoSx) and Ni-metal-organic framework (MOF)-74 via a solvothermal process. Owing to the formation of NiMoS phases that decrease the hydrogen adsorption energy on the catalysts, the MoSx/Ni-MOF-74 based catalysts deliver excellent hydrogen generation performance in acidic media. In particular, an optimal MoSx/Ni-MOF-74 with an amount of 40 wt% MoSx exhibited the best HER performance with a low onset voltage of −114 mV and a small Tafel slope of 53.1 mV dec−1. In addition, the stability of the catalyst was maintained for over 2000 cycles with a slight shift in performance. These results imply that the MoSx/Ni-MOF-74 composite is a promising candidate for the development of non-expensive catalysts for hydrogen production using the electrochemical method.