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One potential strategy to develop hydrogen evolution electrocatalysts for producing sustainable hydrogen in water electrolysis is creating electrocatalysts with low-cost, high activity, and high stability. Herein, we show that low-loading metal-based tungsten oxide (WO 3) can be used as electrocatalysts for the hydrogen evolution reaction (HER) in acid, alkaline, and alkaline-seawater electrolytes. Among prepared electrocatalysts, rhodium (Rh)-WO 3 exhibits a high HER activity with the values of overpotential of 48, 116, and 98 mV to obtain a current density of 10 mA cm−2 in acid, alkaline, and alkaline-seawater electrolytes, respectively. In addition, the Rh-WO 3 electrocatalyst shows high stability during the HER operation for over 60,000 s. Besides, the application of Rh-WO 3 electrocatalyst as cathode and commercial ruthenium oxide (RuO 2) as an anode for overall water splitting show excellent efficiency with only a potential of 1.45 V to a current density of 10 mA cm−2 in the alkaline-seawater electrolyte. The Rh-WO 3 //RuO 2 cell also exhibits high stability for over 80,000 s and maintains a current of 15 mA cm2 at a cell voltage of 1.51 V. The results provide evidence that Rh-WO 3 can be a promising HER catalyst for sustainable hydrogen production via alkaline-seawater electrolysis application. [Display omitted] • Low loading of Rh was synthesized on WO 3 nanosheets. • 5 wt% Rh-WO 3 exhibits excellent HER activity in the alkaline-seawater electrolyte. • The hydrogen spillover effect can improve the HER activity for the catalysts. • 5 wt% Rh-WO 3 as cathode shows the excellent water splitting process in the alkaline-seawater electrolyte. [ABSTRACT FROM AUTHOR]

Nanosized plasmonic metallic nanoparticles such as Pd have gained significant attention due to their diverse applications in catalysis, sensing, and light-to-heat conversion. However, the development of scalable and environmentally friendly synthesis routes for such nanoparticles is crucial for the sustainable development of industrial applications. In this work, we address this challenge by synthesizing Pd-nanoparticles on the cellulose filter paper (Pd-Cellulose) via two scalable green synthesis routes: low-temperature thermal and plasma synthesis. We found that adjusting synthesis conditions allowed us to achieve an optimum morphology that maximizes light absorptance. The nature of the reduction species during synthesis significantly impacts the morphology and heat-transfer properties of the resulting material. Compared to thermally synthesized Pd-Cellulose, the absorbers synthesized with plasma have smaller particles size and higher coverage, which leads to higher broadband light absorptance and more intense heat transfer to the surroundings. The optimized Pd-based light absorbers were utilized in a solar-to-steam desalination system, resulting in an evaporation rate of 1.30 kg/m2h for the open system and a filtration rate of 0.7 kg/m2h for the closed system. Our findings provide insights into the green and scalable synthesis and optimization of Pd-based light absorbers and their potential application in sustainable renewable energy systems. [Display omitted] • Pd-nanoparticles are synthesized via two synthesis routes: thermal and plasma synthesis. • The optimum morphology is achieved for maximized light absorptance. • The nature of the reduction species impacts the morphology and heat-transfer properties of nanoparticles. • A new lab-scale solar-to-steam desalination system with Pd-Cellulose is developed. [ABSTRACT FROM AUTHOR]