Electrochemical behavior of Bi-Se alloy films electrodeposited from nitric acidic solution
In this paper, the processes associated with the electrodeposition of Bi-Se alloy films, a thermoelectric material, were reported along with an analysis of the composition and crystallinity of the resulting films which were characterized by energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).The Bi-Se alloy films were electrodeposited on Au substrates from nitric acidic solutions.The electrodeposition can be described by the general reaction 3 H2SeO3 + 2 Bi3+ + 18e-+ 12 H+ → Bi2Se3 + 9 H2O.The electrodeposition behavior was examined using cathodic polarization, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques.EIS analysis reveal that H2SeO3 in the solution is firstly converted into H2SeO3 (ads.) and then reduced to Se0.Cyclic voltammetry studies of Bi, Se and Bi-Se dissolved in 1 M HNO3 disclose that there are two different underlying processes in the electrodeposition of Bi-Se alloy films.One process involves the reduction of H2SeO3 (ads.) to Se0 and a subsequently induced coelectrodeposition between element Se0 and Bi3+ to form Bi-Se alloy.A second process at more negative reduction potentials involves reduction of H2SeO3 (ads.) to H2Se followed by the chemical reaction with Bi3+ to form Bi-Se alloy.EDS and XRD reveal that Bi-Se alloy films can be electrodeposited in the potential range-0.06 < E < 0.06vs.SCE.
Bismuth selenide Reduction process Voltammetry Electrochemical impedance spectroscopy
Lu-Xia Bu Wei Wang
Department of Basic Science, Tianjin Agricultural University, Tianjin 300384, China Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University,
国内会议
太原
英文
63-74
2014-08-06（万方平台首次上网日期，不代表论文的发表时间）