使用疏水性多孔碳负载 Au 进行高性能电催化 CO2 还原以产生 CO,ACS Sustainable Chemistry & Engineering

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使用疏水性多孔碳负载 Au 进行高性能电催化 CO2 还原以产生 CO
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-07-20 , DOI: 10.1021/acssuschemeng.3c02291
Yanjia Cui ₁ , Yonghui Cheng ₁ , Caili Yang ₁ , Yingshi Su ₁ , Defu Yao ₁ , Biping Liufu ₁ , Jialei Li ₁ , Yiwen Fang ₁ , Suyao Liu ₁ , Ziyi Zhong _{2,

3} , Xiaoming Wang ₁ , Yibing Song ₁ , Zhen Li ₁

Affiliation

电催化还原气态CO ₂为高附加值化学燃料是解决能源和环境问题的理想方法。_{为了在高电流密度下实现CO 2}还原反应（CO ₂ RR）特定产品的高法拉第效率（FE），设计合适的电催化剂以了解结构和性能的关系至关重要。_{在此，我们合成了负载Au纳米颗粒的疏水性多孔碳支架，以探讨多孔结构对CO 2} RR性能的影响。在优化的 20%Au/FPC-800 电催化剂上，在相对于 RHE 为 -0.7 至 -1.1 V 的外加电位范围内，CO 的 FE 高达 92%，并且其对 CO 2 的电流_密度RR也远大于其他三种电催化剂进行比较。基于CO ₂吸附/解吸、塔菲尔斜率、电化学阻抗谱(EIS)和原位衰减全反射-表面增强红外吸收光谱(ATR-SEIRAS)分析的表征，提出疏水性多孔结构有利于CO _{2储存，可以增强CO}₂ RR过程中低溶解度CO ₂分子向电催化剂界面的传质。我们的研究结果提供了一种实现高效率转化CO ₂以生成具有高电流密度的CO 产品的策略。

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High-Performance Electrocatalytic CO2 Reduction for CO Generation Using Hydrophobic Porous Carbon Supported Au

Electrocatalytically reducing gaseous CO₂ to high value-added chemical fuels is an ideal method to address energy and environmental issues. To achieve high Faradic efficiency (FE) of specific products with high current density for the CO₂ reduction reaction (CO₂RR), it is crucial to design suitable electrocatalysts to understand the relationship of structure and performance. Herein, we synthesized a hydrophobic porous carbon scaffold loaded with Au nanoparticles to explore the effect of the porous structure on CO₂RR performance. As high as 92% FE of CO is achieved over the optimized 20%Au/FPC-800 electrocatalyst within the applied potential range of −0.7 to −1.1 V versus RHE, and its current density toward CO₂RR is also much larger than that of other three electrocatalysts for comparison. Based on the characterization of CO₂ adsorption/desorption, Tafel slope, electrochemical impedance spectroscopy (EIS), and in situ attenuated total reflection-surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) analysis, it is proposed that the hydrophobic porous structure favors CO₂ storage, which can enhance the mass transfer of low-soluble CO₂ molecules to the electrocatalyst interface during CO₂RR. Our findings provide a strategy for achieving high FE of converting CO₂ to generate a CO product with a high current density.

更新日期：2023-07-20

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