Owing to the significant potential of alkaline seawater electrolysis for converting surplus power into eco-friendly hydrogen fuel,we developed bifunctional elec-trodes that integrate low-crystalline NiFe LDHs and amorphous NiFe alloy on a Ni foam(NF)substrate to enhance this process.Driven by the battery-like charac-teristics of NiFe LDHs,an anti-corrosive and active outer layer of NiFevacOOH continuously forms over time in the hybrid on the anode for the oxygen evolution reaction(OER),effectively mitigating powder shedding caused by corrosion induced by multiple anions in seawater.Mean-while,the strong bond between the hybrid and the NF substrate maintains intact hybrid coatings to ensure a rel-atively high overall conductivity of the electrodes,signif-icantly reducing the negative effects of structural degradation during the OER and hydrogen evolution reaction(HER),as well as the accumulation of contami-nants on the electrode surfaces.In long-term tests,these bifunctional hybrid electrodes maintained stable performance,even at a high current density of 500 mA·cm-2.The cell voltage increased by only 88 mV over 1000 h to 1.970 V during saline electrolysis and by 103 mV over 500 h to 2.062 V during seawater electroly-sis.Hence,this study provides valuable insights into effi-cient and stable seawater electrolysis using NiFe LDHs-NiFe alloy hybrids.
School of Materials Science and Engineering,Changsha University of Science and Technology,Hunan 410114,China
Department of Materials Science and Engineering,Faculty of Engineering,National University of Singapore,Singapore 117576,Singapore
School of Materials Science and Engineering,Jilin University,Jilin 130022,China
National Natural Science Foundation of ChinaNatural Science Foundation of Hunan ProvinceNatural Science Foundation of Hunan ProvinceNatural Science Foundation of Changsha
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