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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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