Influence of the Chemical Compositions of Bismuth Oxyiodides on the Electroreduction of Carbon Dioxide to Formate,ChemPlusChem

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Influence of the Chemical Compositions of Bismuth Oxyiodides on the Electroreduction of Carbon Dioxide to Formate
ChemPlusChem ( IF 3.0 ) Pub Date : 2020-04-01 , DOI: 10.1002/cplu.202000131
Qizhong Wang _{1,

2} , Meng Ma _{1,

2} , Shuaishuai Zhang ₁ , Kangkang Lu ₂ , Lijun Fu _{1,

2} , Xiaojing Liu _{1,

2} , Yuhui Chen _{1,

2}

Affiliation

Bismuth oxyiodides with varying chemical compositions were fabricated to effectively electrochemical reduce CO₂ to formate. Bi₅O₇I and Bi₇O₉I₃ nanosheets assemble irregularly, and BiOI nanosheets form a sphere‐like structure. Compared with BiOI and Bi₇O₉I₃, Bi₅O₇I exhibits an excellent Faradaic efficiency of 89 % for formate production with the partial current density of 13.2 mA/cm² at −0.89 V vs. RHE owing to the elevated amounts of Bi metal sites reduced from Bi³⁺ during electrolysis. The partial current densities of formate on BiOI were higher than those on Bi₇O₉I₃ which is attributed to the higher iodine content. The synergistic effect of bismuth and iodine of bismuth oxyiodides is responsible for their electrocatalytic properties during CO₂ reduction in aqueous solutions.

中文翻译：

氧化铋的化学组成对二氧化碳电还原形成甲酸盐的影响

制备具有不同化学组成的碘氧化铋，以有效地电化学还原CO ₂形成甲酸酯。Bi ₅ O ₇ I和Bi ₇ O ₉ I ₃纳米片不规则组装，BiOI纳米片形成球形结构。与BiOI和Bi ₇ O ₉ I _3相比，Bi ₅ O ₇ I对甲酸的生产表现出89％的法拉第效率，且在-0.89 V时相对于RHE的分流密度为13.2 mA / cm ² Bi金属位的数量从Bi ³⁺减少在电解过程中。BiOI上甲酸的分流密度高于Bi ₇ O ₉ I _3上的，这是由于碘含量较高。氧化碘化铋中的铋和碘的协同作用是其在水溶液中还原CO ₂期间的电催化性能的原因。

更新日期：2020-04-22

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