Rational design and synthesis of SnOx electrocatalysts with coralline-like structure for highly improved aqueous CO2 reduction to formate
Tin oxide(SnOx)nanocatalysts with a special coralline-like structure are developed via a simple one-step hydrothermal synthesis and then used to prepare a SnOx/GDL(gas diffusion layer)electrode for CO2 electroreduction to formate in 0.5 M KHCO3 aqueous solution.The effects of synthesis conditions such as hydrothermal synthesis temperature(T)and time(△t)on catalysts” morphologies,and valence state of Sn in SnOx nanocatalysts on Faradaic efficiency for formate production are investigated systematically.Using a SnOx(100-8)/GDL(i.e.T and △t are 100℃ C and 8 hours,respectively)as cathode electrode,the maximum Faradaic efficiency as high as 87.1%was obtained at controlled potential of-1.6 V vs.SHE(standard hydrogen electrode),superior to all reported SnOx and Sn/SnOx catalysts in literature.Combined XPS and XRD analysis,it is found that SnOx are composed of SnO and SnO2,where the SnO nanoparticles are covered by about 1~2 nm thickness SnO2 film,contributing to the catalytic active sites for CO2 electroreduction.Such a SnOx(100-8)nanocatalyst(corallined structure)exhibits the better durability,compared with a SnOx(100-4)(non-corallined structure),as evaluated by a stable catalytic current density of approximately 10 mA cm-2 over 20 hours continuous operation.
CO2 electroreduction tin oxides coralline-like structure oxidation state formate
Yanan Li Jinli Qiao Xia Zhang Tao Lei Abel Girma Yuyu Liu Jiujun Zhang
College of Environmental Science and Engineering,Donghua University,2999 Ren”min North Road,Shanghai College of Environmental Science and Engineering,Donghua University,2999 Ren”min North Road,Shanghai Institute of Sustainable Energy,Shanghai University,20 Chengzhong Road,Shanghai,201800,China Institute of Sustainable Energy,Shanghai University,20 Chengzhong Road,Shanghai,201800,China;Energy,
国内会议
上海
英文
1-33
2016-11-04（万方平台首次上网日期，不代表论文的发表时间）