Kunjie Wang,Yanan Li,Dongxu Yang,Yunsi Wang,Fuan Wei,Bingxin Liu,Peng Zhang,Benhua Xu,Yongcheng Li
Coupling noble metals on molybdenum disulfide (MoS 2 ) has emerged as a promising strategy for triggering inert basal plane and boosting hydrogen evolution reaction (HER) performances. Herein, ultrafine Ru nanoparticles (NPs) are decorated on vertical 2H MoS 2 nanosheets via a facile hydrothermal method. Benefiting from new active site centers triggered by ultrafine Ru NPs and vertically grown 2H MoS 2 nanosheets on carbon cloth (CC), Ru 0.15 @2H MoS 2 exhibits impressive HER performances in dual pH media, with low overpotentials of 20 and 111 mV and small Tafel slope of 67.6 and 76.3 mV dec ‑1 in alkaline and acid solutions to drive a current density of 10 mA cm -2 . DFT calculation results prove that ultrafine Ru NPs decorated on 2H MoS 2 nanosheets endow Ru 0.15 @2H MoS 2 with low hydrogen adsorption free energy and fast charge transfer kinetics. This work provides an effective and simple method for designing MoS 2 -based catalysts with high catalytic activity to decorate precious metal in a wide pH medium.
The exploration of non-Pt catalysts that are highly efficient, durable, and cost-effective for the hydrogen evolution reaction (HER) is crucial for enhancing the energy efficiency of water splitting technologies. In this study, we fabricated an electrocatalyst comprising RuP2 nanoparticles decorated on N, P codoped cellulose nanofibers (CNFs)-derived carbon networks (RuP2/NPC) through a simple mixing-pyrolysis strategy. Specifically, the CNFs, which are rich in oxygen-containing functional groups, not only serve as dispersants to prevent the restacking of graphene oxide (GO) and the aggregation of RuP2 nanoparticles, thereby exposing more active sites, but also form a conductive network with GO to facilitate electron transport. Moreover, density functional theory (DFT) calculations indicate that the integration of NPC regulates the electronic structure of RuP2, resulting in a nearly thermoneutral ΔGH* at the Ru site of RuP2/NPC and making the HER process more feasible. Consequently, the synthesized catalyst exhibits excellent catalytic activity, achieving low overpotentials of 41 mV in 0.5 M H2SO4 and 52 mV in 1.0 M KOH to drive a current density of 10 mA cm–2, while maintaining robust stability. Notably, RuP2/NPC also demonstrates promising performance in alkaline seawater electrolysis, requiring an overpotential of merely 108 mV to support the same level of current density. This research significantly advances the application of CNFs-derived carbon materials in hydrogen production and contributes to the high-value utilization of forestry resources, thereby providing an inspiring avenue for the advancement of efficient and sustainable energy conversion technologies.
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