Developing a bifunctional water splitting catalyst with high efficiency and low cost are crucial in the electrolysis water industry. Here, we report a rational design and simple preparation method of MoS 2-based bifunctional electrocatalyst on carbon cloth (CC). The optimized P-doped MoS 2 @CoP/CC catalyst presents low overpotentials for the hydrogen (HER) and oxygen evolution reactions (OER) of 64 and 282 mV in alkaline solution as well as 72 mV HER overpotential in H 2 SO 4 at a current density of 10 mA cm À 2. Furthermore, P-MoS 2 @CoP/CC as a bifunctional catalyst delivered relatively low cell voltages of 1.83 and 1.97 V at high current densities of 500 and mA cm À 2 in 30 % KOH. The two-electrode system showed a remarkable stability for 30 h, even outperformed the benchmark RuO 2 j j Pt/ C catalyst. The excellent electrochemical performance can be credited to the unique microstructure, high surface area, and the synergy between metal species. This study presents a possible alternative for noble metal-based catalysts to overcome the challenges of industrial applications.
The development of hydrogen evolution reaction (HER) catalysts with high performance under large current density is still a challenge. Introducing P vacancies in heterostructure is an appealing strategy to enhance HER kinetics. In this study, we investigated a CoP‐FeP heterostructure catalyst with abundant P vacancies (Vp‐CoP‐FeP/NF) on nickel foam (NF), which was prepared using dipping and phosphating treatment. The optimized Vp‐CoP‐FeP catalyst exerted prominent HER catalytic capability, requiring an ultra‐low overpotential (58 mV @ 10 mA cm‐2) and displaying robust durability (50 h @ 200 mA cm‐2) in 1.0 M KOH solution. Furthermore, the catalyst demonstrated superior overall water splitting activity as cathode, demanding only cell voltage of 1.76 V at 200 mA cm‐2, outperforming Pt/C/NF(−) || RuO2/NF(+). The catalyst's outstanding performance can be attributed to the hierarchical structure of porous nanosheets, abundant P vacancies, and synergistic effect between CoP and FeP components, which promote water dissociation and H* adsorption and desorption, thereby synergically accelerating HER kinetics and enhancing HER activity. Our study demonstrates the potential of HER catalysts with phosphorus‐rich vacancies that can work under industrial‐scale current density, highlighting the importance of developing durable and efficient catalysts for hydrogen production.
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