• Seawater electrolysis represents a potential solution to grid-scale production of carbonneutral
    hydrogen energy without reliance on freshwater. However, it is challenged by high
    energy costs and detrimental chlorine chemistry in complex chemical environments. Here we
    demonstrate chlorine-free hydrogen production by hybrid seawater splitting coupling
    hydrazine degradation. It yields hydrogen at a rate of 9.2 mol h–1 gcat
    –1 on NiCo/MXenebased
    electrodes with a low electricity expense of 2.75 kWh per m3 H2 at 500 mA cm–2 and
    48% lower energy equivalent input relative to commercial alkaline water electrolysis.
    Chlorine electrochemistry is avoided by low cell voltages without anode protection regardless
    Cl– crossover. This electrolyzer meanwhile enables fast hydrazine degradation to ~3 ppb
    residual. Self-powered hybrid seawater electrolysis is realized by integrating low-voltage
    direct hydrazine fuel cells or solar cells. These findings enable further opportunities for
    efficient conversion of ocean resources to hydrogen fuel while removing harmful pollutants.

  • State Key Lab of Fine Chemicals, Liaoning Key Lab for Energy Materials and Chemical Engineering, PSU-DUT Joint Center for Energy Research, Dalian University of Technology, Dalian, China



    Copyright: © The Author(s) 2021

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