Ion‐Enhanced Conversion of CO2 into Formate on Porous Dendritic Bismuth Electrodes with High Efficiency and Durability,ChemSusChem

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Ion‐Enhanced Conversion of CO2 into Formate on Porous Dendritic Bismuth Electrodes with High Efficiency and Durability
ChemSusChem ( IF 7.5 ) Pub Date : 2019-11-22 , DOI: 10.1002/cssc.201902581
Guangxia Piao ₁ , Sun Hee Yoon ₂ , Dong Suk Han ₃ , Hyunwoong Park ₁

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Facile synthesis of efficient electrocatalysts that can selectively convert CO₂ to value‐added chemicals remains a challenge. Herein, the electrochemical synthesis of porous Bi dendrite electrodes and details of their activity toward CO₂ conversion to formate in aqueous solutions of bicarbonate are presented. The as‐synthesized multilayered, porous, dendritic Bi electrodes exhibit a faradaic efficiency (FE) of approximately 100 % for formate production. Added halides and cations significantly influence the steady‐state partial current density for formate production J_FM (Cl⁻>Br⁻≈I⁻; Cs⁺>K⁺>Li⁺). DFT calculations revealed that the reaction pathway involving the species *OCOH occurs predominantly and the presence of both Cs⁺ and Cl⁻ makes the overall reaction more spontaneous. Photovoltaic‐cell‐assisted electrocatalysis produced formate with an FE of approximately 95 % (J_FM≈10 mA cm⁻²) at an overall solar conversion efficiency of approximately 8.5 %. The Bi electrodes maintain their activity for 360 h without a change in the surface states.

中文翻译：

在多孔树枝状铋电极上以高效率和持久性将离子从CO2转化为甲酸的离子增强

如何有效地合成能够选择性地将CO ₂转化为增值化学品的高效电催化剂仍然是一个挑战。在此，给出了多孔Bi枝状电极的电化学合成及其在碳酸氢盐水溶液中对CO ₂转化成甲酸的活性的细节。合成后的多层多孔树状Bi电极在甲酸生产中表现出约100％的法拉第效率（FE）。加入卤化物和阳离子显著影响稳态局部电流密度为甲酸生产Ĵ _FM（CL ^- >溴^- ≈I ^- ;铯⁺ >ķ ⁺ >锂⁺）。DFT计算表明，涉及* OCOH主要发生的种类和两个Cs的存在下的反应途径⁺和Cl ^-使得整个反应更自发的。光伏电池辅助电催化产生具有大约95％的FE（甲Ĵ _FM ≈10毫安厘米^-2以大约8.5％的总太阳能转换效率）。Bi电极保持其活性360小时，而表面状态没有变化。

更新日期：2019-11-22

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