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电化学(中英文) ›› 2017, Vol. 23 ›› Issue (2): 238-244.  doi: 10.13208/j.electrochem.161253

• 田昭武先生90大寿祝贺专辑(厦门大学 孙世刚 林昌健教授主编) • 上一篇    下一篇

在TiO2纳米阵列上电沉积RuO2用于CO2电还原

蒋 孛,张莉娜,秦先贤,蔡文斌*   

  1. 复旦大学化学系,能源材料化学协同创新中心,上海市分子催化与功能材料表面重点实验室,上海 200433
  • 收稿日期:2017-04-07 修回日期:2017-04-28 出版日期:2017-04-28 发布日期:2017-04-28
  • 通讯作者: 蔡文斌 E-mail:wbcai@fudan.edu.cn
  • 基金资助:

    This work is supported by the 973 Program (No. 2015CB932303) of MOST and NSFC (No. 21473039).

Electrodeposition of RuO2 Layers on TiO2 Nanotube Array toward CO2 Electroreduction

Bei Jiang, Lina Zhang, Xianxian Qin, Wenbin Cai*   

  1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2017-04-07 Revised:2017-04-28 Published:2017-04-28 Online:2017-04-28
  • Contact: Wenbin Cai E-mail:wbcai@fudan.edu.cn
  • Supported by:

    This work is supported by the 973 Program (No. 2015CB932303) of MOST and NSFC (No. 21473039).

摘要:

传统上,RuO2/TiO2复合电极制备是通过在TiO2/Ti基体上多次涂覆含Ru前驱体溶液和随后热分解(TD)来实现的. 为克服上述方法中Ru用量大和利用率低之不足, 本工作主要基于循环伏安法(CV)在TiO2纳米管阵列(TNA)上电沉积RuO2制备RuO2CV/TNA复合电极. SEM、GIXRD和CV结果表明, 电沉积的RuO2为无定型结构, 所制备电极中的Ru用量约为传统的RuO2TD/TNA电极中Ru用量的1/30. 尽管两电极催化CO2还原产物的法拉第效率接近, 但是RuO2CV/TNA电极比RuO2TD/TNA电极展示了更高的还原电流, 较正的初始还原电位和更好的稳定性. 与磷酸盐缓冲溶液中电还原CO2相比,RuO2CV/TNA电极在0.1 mol•L-1 KHCO3中电还原CO2除生成更高法拉第效率的甲酸根和甲烷外,还检测到CO的生成.

关键词: CO2还原, 无定型RuO2, TiO2纳米阵列, 电沉积

Abstract:

RuO2/TiO2 composite materials have multitude of electrocatalytic applications including but not limited to CO2 reduction reaction (CO2RR). RuO2/TiO2 electrodes were previously prepared by repetitive coating and thermal decomposition (TD) of a Ru(III) precursor solution on Ti substrate. In this work, electrochemical potential cycling is applied to deposit amorphous RuO2 (α-RuO2) layers onto TiO2 nanotube array (TNA) (RuO2CV/TNA) preformed on Ti foil. SEM, GIXRD, and voltammetry are applied to characterize the structures of the resulting RuO2CV/TNA. Ru loading on the RuO2CV/TNA electrode is ca. 1/30 of that on the conventional RuO2TD/TNA electrode. Although both electrodes yield similar faradaic efficiencies (FEs) for the reduction products, the RuO2CV/TNA electrode displays a much higher reduction current, a more positive initial reduction potential and a better durability than the RuO2TD/TNA one. In addition to higher FEs for formate and CH4, the RuO2CV/TNA electrode yields the product of CO for the CO2RR in 0.1 mo•lL-1 KHCO3, which is not available in a PBS solution with pH 7.

Key words: CO2 reduction, amorphous RuO2, TiO2 nanotube array, electrodeposition

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