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Journal of Electrochemistry ›› 2017, Vol. 23 ›› Issue (2): 238-244.doi: 10.13208/j.electrochem.161253

• Special Issue in Honor of Professor Zhaowu Tian on His 90th Birthday • Previous Articles     Next Articles

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 Online:2017-04-28 Published:2017-04-29
  • 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).

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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