在TiO_2纳米阵列上电沉积RuO_2用于CO_2电还原（英文）  

Electrodeposition of RuO_2 Layers on TiO_2 Nanotube Array toward CO_2 Electroreduction

作　　者：蒋孛 张莉娜[1] 秦先贤 蔡文斌[1] 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, Chin)

机构地区：[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

出　　处：《电化学》2017年第2期238-244,共7页Journal of Electrochemistry

基　　金：supported by the 973 Program(No.2015CB932303) of MOST and NSFC(No.21473039)

摘　　要：传统上,RuO_2/TiO_2复合电极制备是通过在TiO_2/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TiO_2纳米管阵列(TNA)上电沉积RuO_2制备RuO_2^(CV)/TNA复合电极.SEM、GIXRD和CV结果表明,电沉积的RuO_2为无定型结构,所制备电极中的Ru用量约为传统的RuO_2^(TD)/TNA电极中Ru用量的1/30.尽管两电极催化CO_2还原产物的法拉第效率接近,但是RuO_2^(CV)/TNA电极比RuO_2^(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CO_2相比,RuO_2^(CV)/TNA电极在0.1 mol·L^(-1) KHCO_3中电还原CO_2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.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 RuO2^CV/TNA. Ru loading on the RuO2^CV/TNA electrode is ca. 1/30 of that on the conventional RuO^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^CV/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 mol·L^-1 KHCO3, which is not available in a PBS solution with pH 7.

关 键 词：CO2还原 无定型RuO2 TiO2纳米阵列 电沉积 

分 类 号：O646.54[理学—物理化学]