过电位
阳极
电解
材料科学
氢氧化物
无机化学
催化作用
碱性水电解
化学工程
电流密度
海水
硫黄
碱性电池
电解水
热液循环
氢氧化钾
腐蚀
拉曼光谱
电化学
制氢
氯
分解水
阴极
碱性燃料电池
电流(流体)
硫酸盐
阴极保护
析氧
电解质
电解槽
兴奋剂
氢氧化钠
作者
Hua Chen,Mingyu Liu,Zhenju Jiang,Shengjun Sun,Imran Shakir,Shuai Hou,Xuping Sun
标识
DOI:10.26599/nre.2025.9120211
摘要
Alkaline seawater electrolysis is promising for large-scale production of green hydrogen but the chlorine evolution reaction (CER) causes severe anode’s corrosion under high current densities. This work described the use of a sulfur-doped NiFe layered double hydroxide nanoarray on Ni foam (S-NiFe LDH/NF) synthesized through a two-step hydrothermal process as a durable catalyst for alkaline seawater oxidation. In 1 M KOH + seawater, the S-NiFe LDH/NF anode needs a low overpotential of 345 mV to afford a current density of 1000 mA·cm−2 and operates stably over 800 h. Sulfate species generated on the catalyst surface, which is evidenced by in situ Raman spectroscopy analysis, electrostatically repel Cl− and thus inhibits the CER. Furthermore, the two-electrode system using S-NiFe LDH/NF and Pt/C/NF as the anode and cathode, respectively, requires a cell voltage of 1.90 V to achieve a current density of 100 mA·cm−2 and maintains stable operation for 1000 h at 500 mA·cm−2 in alkaline seawater.
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