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过程工程学报 ›› 2020, Vol. 20 ›› Issue (8): 989-996.DOI: 10.12034/j.issn.1009-606X.219314

• 环境与能源 • 上一篇    

不同浸渍时间对CuO/Cu@BC电极催化CO2还原性能的影响

周 玥1, 郭晓晶1, 李宣江2, 高 璐2, 洪 枫2, 乔锦丽1*   

  1. 1. 东华大学环境科学与工程学院,上海 201620 2. 东华大学化学化工与生物工程学院,上海 201620
  • 收稿日期:2019-10-10 修回日期:2019-12-07 出版日期:2020-08-24 发布日期:2020-08-24
  • 通讯作者: 乔锦丽
  • 基金资助:
    国家自然科学基金重大计划(培育)资助项目;中央高校修购计划

Effect of different soaking time on catalytic performance of CuO/Cu@BC electrode for CO2 reduction

Yue ZHOU1, Xiaojing GUO1, Xuanjiang LI2, Lu GAO2, Feng HONG2, Jinli QIAO1*   

  1. 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China 2. College of Chemistry, Chemical Engineering & Biotechnology, Donghua University, Shanghai 201620, China
  • Received:2019-10-10 Revised:2019-12-07 Online:2020-08-24 Published:2020-08-24

摘要: 将具有3D网状结构的细菌纤维素(BC)膜作为催化剂载体,通过原位化学还原法制备了负载Cu和CuO纳米复合材料的催化剂电极(CuO/Cu@BC),并通过改变BC膜的浸渍时间实现电极结构调控以探索最佳条件。结果表明,具有3D球形结构的CuO/Cu24h@BC电极对CO2还原表现出较好的电子传输性能和更高的电流密度。CuO/Cu24h@BC电极的电化学比表面积最大,达12 mF/cm2。CuO/Cu24h@BC电极可将CO2电催化转化为CO,且产生CO的法拉第效率为52%。

关键词: 二氧化碳还原, 细菌纤维素膜, 铜和氧化铜, 原位化学还原法, 一氧化碳

Abstract: As an environmentally-friendly and cost-effective biological 3D carbon nanomaterial, bacterial cellulose (BC) has been gradually used in flexible electronics. However, the application of BC in electrochemical CO2 reduction (ECR-CO2) reactions is rare. Herein, to promote its applications in ECR-CO2, BC with a 3D network structure was used as a catalyst carrier, and a catalyst electrode (CuO/Cu@BC) supporting Cu and CuO nanocomposites was prepared by in situ chemical reduction. To investigate optimal conditions, the soaking time of the BC membrane was changed to achieve structure regulation. The results revealed that at a soaking time of 24 h, the CuO/Cu24h@BC electrode exhibited a high electroactive area (12 mF/cm2), providing a considerable increase in the number of active sites for CO2 absorption; this result was verified by investigation of the electrocatalytic activity and performance. The electrochemical impedance test revealed that the activation resistor of the electrode was small and that the activation energy was high, thereby improving the electron conductivity by building an efficient transfer highway for Cu and CuO. Scanning electron microscopy analysis of the morphology of the CuO/Cu@BC electrode revealed a uniform coverage in addition to the even decoration of nanoparticles (50~70 nm) on the top, facilitating the penetration of the electrolyte. On the other hand, the seaweed structure of the CuO/Cu8h@BC electrode and the adverse combination of the nanoparticles of the CuO/Cu16h@BC electrode were disadvantageous to the transformation of CO2. In terms of the product analysis by ECR-CO2, the CuO/Cu24h@BC electrode exhibited outstanding selectivity for CO with a faradaic efficiency of 52% at a potential of ?0.6 V vs. RHE in a 0.5 mol/L KHCO3 electrolyte. All the above results demonstrated that BC was superior as an efficient electrode substrate to support electrocatalysts for CO2 reduction and that the CuO/Cu24h@BC electrode exhibited good performance for the reduction of CO2 to CO.

Key words: Electrochemical CO2 reduction reactions (ECR-CO2), Bacterial cellulose, Copper and copper oxide, In-situ chemical reduction, Carbon monoxide