AI Article Synopsis
- Electrolysis of water to produce hydrogen fuel offers a renewable energy storage solution, but using freshwater for grid-scale applications could lead to water scarcity issues.
- Researchers have developed a new multilayer anode that combines nickel-iron hydroxide and nickel sulfide on porous nickel foam, achieving excellent performance and resilience against corrosion during alkaline seawater electrolysis.
- The innovative anode maintains high catalytic activity for over 1,000 hours by creating protective layers that effectively repel chloride, allowing it to operate efficiently in salty environments.
Article Abstract
Electrolysis of water to generate hydrogen fuel is an attractive renewable energy storage technology. However, grid-scale freshwater electrolysis would put a heavy strain on vital water resources. Developing cheap electrocatalysts and electrodes that can sustain seawater splitting without chloride corrosion could address the water scarcity issue. Here we present a multilayer anode consisting of a nickel-iron hydroxide (NiFe) electrocatalyst layer uniformly coated on a nickel sulfide (NiSx) layer formed on porous Ni foam (NiFe/NiSx-Ni), affording superior catalytic activity and corrosion resistance in solar-driven alkaline seawater electrolysis operating at industrially required current densities (0.4 to 1 A/cm) over 1,000 h. A continuous, highly oxygen evolution reaction-active NiFe electrocatalyst layer drawing anodic currents toward water oxidation and an in situ-generated polyatomic sulfate and carbonate-rich passivating layers formed in the anode are responsible for chloride repelling and superior corrosion resistance of the salty-water-splitting anode.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6452679 | PMC |
| http://dx.doi.org/10.1073/pnas.1900556116 | DOI Listing |
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