Hydrogen production is the key step for the future hydrogen economy. As a promising H production route, electrolysis of water suffers from high overpotentials and high energy consumption. This study proposes an N-doped CoP as the novel and effective electrocatalyst for hydrogen evolution reaction (HER) and constructs a coupled system for simultaneous hydrogen and sulfur production. Nitrogen doping lowers the d-band of CoP and weakens the H adsorption on the surface of CoP because of the strong electronegativity of nitrogen as compared to phosphorus. The H adsorption that is close to thermos-neutral states enables the effective electrolysis of the HER. Only -42 mV is required to drive a current density of -10 mA cm for the HER. The oxygen evolution reaction in the anode is replaced by the oxidation reaction of Fe , which is regenerated by a coupled H S absorption reaction. The coupled system can significantly reduce the energy consumption of the HER and recover useful sulfur sources.
Hydrazine oxidation (HzOR)-assisted overall water splitting (OWS) provides a unique approach to energy-efficient hydrogen production (HER). However, there are still major challenges in the design of bifunctional catalysts and gain deep insight into the mechanism of both water dissociation and dehydrogenation kinetics triggered by the same active species during HzOR-assisted OWS. Here, ruthenium single atoms (Ru SAs) anchored onto sulphur-vacancies of tungsten disulphide (WS 2 ) are prepared by a sulfidation and facile galvanostatic deposition strategy. The WS 2 /Ru SAs act as a bifunctional catalyst and outperforms commercial platinum (Pt) catalysts for both HzOR and HER. Ultralow potentials of −74 and −32.1 mV at 10 mA cm −2 are achieved for HzOR and HER, respectively. Two-electrode electrolyzer using WS 2 /Ru SAs as both anode and cathode reaches 10 mA cm −2 with cell voltage of only 15.4 mV, which is far below that of most electrocatalysts including commercial Pt. Density functional theory calculations unravel the critical role of Ru SAs in WS 2 , where the sluggish dissociation of water in HER can be promoted on Ru sites, and the sulfur sites of WS 2 exhibit a more thermoneutral behavior for hydrogen intermediate adsorption. Moreover, Ru sites are also active centers for stepwise hydrazine dehydrogenation during HzOR.
Superthermites with three Fe2O3 morphologies (rod-like, polyhedral, and olivary) were synthesized. The morphological effects of Al/Fe2O3 on the thermal decomposition property of nitrocellulose (NC) were investigated.
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