Synergistic enhancement of overall seawater splitting by atomic doping and heterostructure interface engineering in W-MoS2@FeNi2S4/NF catalyst

In response to the environmental crisis caused by fossil fuel dependence, this paper explores the potential of hydrogen as a clean alternative energy source. Electrolytic water technology is an important way to produce hydrogen, but it faces challenges such as low energy efficiency, high cost and limited fresh water resources. In order to solve these problems, a high efficiency W-MoS2@FeNi2S4/NF seawater electrolysis catalyst based on non-precious metal materials was firstly developed by using atomic doping techniques and constructing the heterostructure of interface engineering. The catalyst showed excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance in seawater electrolyte of 1.0 M KOH, where the W-MoS2@FeNi2S4/NF electrode had an overpotential of 130 mV and 255 mV at a current density of 10 mA cm-2 and 100 mA cm- 2 for HER and OER. In addition, density functional theory (DFT) calculation shows that the FeNi2S4 material plays a key role in catalysis, and the synergistic catalysis of the W-MoS2 and FeNi2S4 materials makes the W-MoS2@FeNi2S4 electrode present a better catalytic performance. This innovation is not only of great significance in promoting the development and application of green energy technologies, but is also expected to develop more efficient and economical electrolytic water catalysts through continued innovation, making an important contribution to achieving carbon neutrality goals and building a sustainable energy system.