Hollow CoFe-layered double hydroxide polyhedrons for highly efficient CO2 electrolysis
نویسندگان
چکیده
可再生能源驱动电催化二氧化碳还原制备高附加值化学燃料, 是一种实现二氧化碳资源化的有效途径. 以金属有机骨架(MOF)为模 板制备的层状双金属氢氧化物空心多面体已成为当前电催化领域的热 门材料. 然而, 该类材料的高析氢活性严重阻碍了其在电催化二氧化碳 还原中的应用. 基于此, 本文报道了一种在离子液体电解液中可高效稳 定电催化二氧化碳还原的钴铁层状双金属氢氧化物空心多面体(CoFe LDH/HP), 其最大法拉第转换效率可达86% ± 3% (−0.9 V相对于可逆氢 电极), 且可连续电解30 h. 实验结果表明此CoFe LDH/HP因其独特的 空心结构可暴露更多的活性位点, 从而具有更快的电催化二氧化碳还 原动力学; 理论计算表明CoFe LDH/HP中Co–O–Fe键有利于稳定关键 中间体(*COOH)并降低相应的活化势垒. 本研究可为其他层状双金属 氢氧化物用于二氧化碳固定的设计提供参考.
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ژورنال
عنوان ژورنال: Science China. Materials
سال: 2021
ISSN: ['2095-8226', '2199-4501']
DOI: https://doi.org/10.1007/s40843-021-1890-7