A Novel Approach for the Preparation of Carbon Supported Intermetallic Cu3sn Nanoparticles and Their Electrocatalytic Performance for CO2 Reduction

Tuesday, 30 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
Y. Liu, T. Gunji, T. Tanabe, S. Kaneko, T. Ohsaka (Kanagawa University), M. Miyauchi (Tokyo Institute of Technology), and F. Matsumoto (Kanagawa University)
Carbon supported ordered intermetallic Cu3Sn nanoparticles (NPs), which had a Cu3Ti type structure (1), was successfully prepared through a wet-chemical method (2) using lithium triethylborohydride as reducing agent. The prepared ordered intermetallic Cu3Sn was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electronic microscope (TEM). Cu3Sn intermetallic structure not only showed a higher electrocatalytic activity towards CO2 electrochemical reduction, but also selectively converted CO2to CO, compared with pure Cu NPs.

Figure 1 allows us to confirm the crystal structure of intermetallic Cu3Sn, disordered Cu-Sn alloy and pure Cu NPs, respectively. The main diffraction peaks of Cu NPs and disordered Cu-Sn alloy can be observed which are assigned as FCC-type structure while the XRD pattern of intermetallic NPs shows a good fit with stoichiometric Cu3Sn structure based on Cu3Ti-type lattice (1). Figure 2 shows the Faradaic efficiency (FE) for gaseous products which was evaluated in CO2 reduction for intermetallic Cu3Sn under the potential varying from -0.8 V to -1.6 V vs.RHE. It is suggested that the FE of CO production reaches the highest value of 40 % at -1.4 V, while the FE of hydrogen production is suppressed under 17%.

[1] Y. Watanabe, et al., Acta Cryst., B39, 1983, 306-311.

[2] F. Wang. et al., J. Alloys Comp., 439, 2007, 249–253.