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Chemcial Industry and Engineering 2016, Vol. 33 Issue (5) :8-13    DOI: 10.13353/j.issn.1004.9533.20141019
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Fabrication of Porous Tin and Its Application to Electroreduction of CO2
Han Zhenzhen, Wang Hua, Wang Jing, Han Jinyu
Key laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract 

The porous tin electrode was fabricated by hydrogen bubbles evolution using Cu as substrate. It was characterized by SEM, EDS and XRD, and its application to electroreduction of CO2 to formic acid was investigated. SEM revealed that a kind of self-assembly distribution constructed honeycomb-like porous network, and EDS indicated that there were no impurities. XRD revealed that there was Sn-Cu intermetallic compound layer at the interface between tin deposit layer and copper, which can enhance the bonding force of the two. Cyclic voltammetry curves at different scan rates indicated that its electroactive surface area was six times higher than that of the commercial Sn electrode. Cyclic voltammetry curves of two electrodes demonstrated that porous Sn electrodes were more favorable to CO2 reduction in which it improved current density and had a more positive onset potential. Effects of concentration of KHCO3 and potential were investigated, which indicated the best catalytic activity existed in 0.5 mol/L KHCO3 electrolyte at -1.7 V vs.SCE, and the maximum current efficiency of formic acid reached 73.9%. Thus, porous electrode materials can effectively improve the catalytic effect of CO2 electroreduction.

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Han Zhenzhen
Wang Hua
Wang Jing
Han Jinyu
Keywordsporous Sn electrode;   carbon dioxide;   electroreduction;   current density;   current efficiency     
Received 2014-05-20;
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Han Zhenzhen, Wang Hua, Wang Jing, Han Jinyu.Fabrication of Porous Tin and Its Application to Electroreduction of CO2[J]  Chemcial Industry and Engineering, 2016,V33(5): 8-13
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