Fabrication of Ag2S electrode for CO2 reduction in organic media
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Electro-reduction of carbon dioxide (CO2) to carbon monoxide (CO) has been extensively studied on metal and alloy electrodes for many decades. However, owing to their disadvantages of low current density and high over-potential, the practical application of these electrodes has been limited. Hence, it is highly desirable to explore new and high efficient electrode for CO2 reduction to CO. Ag2S has been widely studied as electrode material in electrochemistry due to its unique properties, such as high conductivity, chemical stability, and easy to be prepared. In this work, we have fabricated an Ag2S electrode via electro-oxidation of Ag in aqueous solution. X-ray diffraction (XRD) and scanning electron microscope (SEM) confirm that Ag2S has been modified on Ag foil, which made the electrode surface roughness. And then, we have evaluated the performance of Ag2S electrode as the cathode for CO2 reduction in propylene carbonate/tetrabutylammonium perchlorate. The cathodic current density reaches to 9.85 mA/cm2, with the faradic efficiency for CO formation remaining stable at 92% during 4 h long-term electrolysis.
KeywordsCO2 electro-reduction Organic electrolyte Ag2S electrode
We gratefully acknowledge the financial support from the National Natural Science Foundation of China (NSFC 51164020, 51062009), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the Analysis and Testing Foundation of Kunming University of Science and Technology (20152102004, 20060130), and Free Exploration Fund for Academician of Chinese Academy of Engineering in Yunnan (2017HA006).
- 2.Liu M, Pang Y, Zhang B, De Luna P, Voznyy O, Xu J, Zheng X, Dinh CT, Fan F, Cao C, de Arquer FP, Safaei TS, Mepham A, Klinkova A, Kumacheva E, Filleter T, Sinton D, Kelley SO, Sargent EH (2016) Enhanced electrocatalytic CO2 reduction via field-induced reagent concentration. Nature 537:382–386CrossRefGoogle Scholar
- 3.Hu B, Guild C, Suib SL (2013) Corrigendum to “Thermal, electrochemical and photochemical conversion of CO2 to fuels and value-added products”. J CO2 Util 2:18–27Google Scholar
- 10.H. Y, Electrochemical CO2 reduction on metal electrodes. Springer New York (2008) 89–189Google Scholar
- 11.Catriona O’Sullivan, Robert D. Gunning, Ambarish Sanyal, Christopher A. Barrett, Hugh Geaney, Fathima R. Laffir, Shafaat Ahmed, K. M. Ryan,  Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment. J Am Chem Soc 131 (2009) 12250–12257Google Scholar
- 16.Adams N W H, K. J. R., Potentiometric determination of silver thiolate formation constants using a Ag2S electrode. Pdf>, Aquat Geochem 5 (1999) 1–11Google Scholar
- 17.Eckert W (1998) Electrochemical identification of the hydrogen sulfide system using a pH2S (glass/Ag°, Ag2S) electrode. J Electrochem Soc 1:77–79Google Scholar
- 23.Neubauer SS, Schmid B, Reller C, Guldi DM, Schmid G (2017) Alkalinity initiated decomposition of mediating imidazolium ions in high current density CO2 electrolysis. Chem Electro Chem 4:160–167Google Scholar
- 28.Shi J, Li Q-Y, Shi F, Song N, Jia Y-J, Hu Y-Q, Shen F-x, Yang D-w, Dai Y-N (2016) Design of a two-compartment electrolysis cell for the reduction of CO2 to CO in tetrabutylammonium perchlorate/propylene carbonate for renewable electrical energy storage. J Electrochem Soc 163:G82–GG7CrossRefGoogle Scholar
- 31.Shaharun MS, Mukhtar H, Yusup S, Dutta BK (2008) Kinetics of hydroformylation of higher olefins using rhodiumphosphite catalyst in a thermomorphic solvent system. Aiche Meeting 1:1–9Google Scholar