在TiO2纳米阵列上电沉积RuO2用于CO2电还原

doi:10.13208/j.electrochem.161253

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*

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*

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/Abstract

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RuO₂^CV/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RuO₂^TD/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RuO₂^CV/TNA电极比RuO₂^TD/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，RuO₂^CV/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) (RuO₂^CV/TNA) preformed on Ti foil. SEM, GIXRD, and voltammetry are applied to characterize the structures of the resulting Ru_O2^CV/TNA. Ru loading on the RuO₂^CV/TNA electrode is ca. 1/30 of that on the conventional RuO₂^TD/TNA electrode. Although both electrodes yield similar faradaic efficiencies (FEs) for the reduction products, the RuO₂^CV/TNA electrode displays a much higher reduction current, a more positive initial reduction potential and a better durability than the RuO₂^TD/TNA one. In addition to higher FEs for formate and CH₄, the RuO₂^CV/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

中图分类号:

O646

蒋孛, 张莉娜, 秦先贤, 蔡文斌. 在TiO₂纳米阵列上电沉积RuO₂用于CO₂电还原[J]. 电化学（中英文）, 2017, 23(2): 238-244.

Bei Jiang, Lina Zhang, Xianxian Qin, Wenbin Cai. Electrodeposition of RuO₂ Layers on TiO₂ Nanotube Array toward CO₂ Electroreduction[J]. Journal of Electrochemistry, 2017, 23(2): 238-244.

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在TiO₂纳米阵列上电沉积RuO₂用于CO₂电还原

Electrodeposition of RuO₂ Layers on TiO₂ Nanotube Array toward CO₂ Electroreduction

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