Abstract
Transition metal sulfides are cheap and efficient catalysts for water splitting to produce hydrogen; these compounds have attracted wide attention. Nickel sulfide (NiS2) has been studied in depth because of its simple preparation process, excellent performance and good stability. Here, we propose a modification to the hydrothermal synthesis method for the fabrication of a highly efficient and stable NiS2 electrocatalyst prepared by two different sulfur sources, i.e., sulfur powder and C3H7NaO3S2 (MPS), for application in hydrogen evolution reactions. The obtained NiS2 demonstrated excellent HER performance with an overpotential of 131 mV to drive -10 mA cm−1 in 0.5 M H2SO4 solution with 5mV performance change after 1000 cycles of stability testing. We believe that this discovery will promote the industrial development of nonprecious metal catalysts.
Highlights
Fossil fuels have been extremely important over the past hundred years, at the same time causing very serious damage to the environment [1,2,3]
We propose a hydrothermal synthesis method of polyhedral NiS2 (MS) from C3H7O3NaS2 (MPS) and sulfur powder used as the dual sulfur source
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Summary
Fossil fuels have been extremely important over the past hundred years, at the same time causing very serious damage to the environment [1,2,3]. In order to alleviate the pressure on the ecological environment, people have begun to look for more green, efficient and low-cost methods of energy generation [4,5,6]. Hydrogen is a clean energy source; it has a calorific value higher than fossil fuels and may be produced from water without pollution to the environment [7]. There are a variety of extremely stable and high-efficiency catalysts, such as platinum and palladium; their application is limited by their high cost [13,14]. There is a need to find a low-cost and stable catalyst
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