Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (1): S10307 doi: 10.13538/j.1001-8042/nst.26.S10307

• NUCLEAR CHEMISTRY,RADIOCHEMISTRY,RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Electrochemical behavior of Pd(II) and Rh(III) in [EMIm]NTf2 ionic liquid

GU Shuai,1 WANG Xin-Peng,1 WEI Yue-Zhou,1 and FANG Bai-Zeng2   

  1. 1School of Nuclear Science and Engineering, Shanghai 200240, China
    2Department of Chemical & Biological Engineering, University of British Columbia,
    2360 East Mall, Vancouver, Brithish Columbia, V6T 1Z3, Canada
  • Contact: WEI Yue-Zhou E-mail:yzwei@sjtu.edu.cn
  • Supported by:

    the National Natural Science Foundation of China (Nos.91026019 and 91126006)

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GU Shuai,WANG Xin-Peng,WEI Yue-Zhou,and FANG Bai-Zeng. Electrochemical behavior of Pd(II) and Rh(III) in [EMIm]NTf2 ionic liquid.Nuclear Science and Techniques, 2015, 26(1): S10307     doi: 10.13538/j.1001-8042/nst.26.S10307

Abstract:

The electrochemical behavior of Pd(II) and Rh(III) in [EMIm]NTf2 ionic liquid has been studied on Pt working
electrodes at 298K by cyclic voltammetry (CV), polarization curve and galvanostatic transient techniques.
Cyclic voltammogram of Pd(II) in [EMIm]NTf2 consists of two cathodic current peaks located at 1:37 V(Epc2),
corresponding to Pd2+/Pd+, and at 0:69V (Epc1) corresponding to Pd+/Pd. The transfer coefficient was calculated
by the Tafel extrapolation from the polarization curves to be 0.306, which is in agreement with the value
reported in an aqueous solution system. For Rh(III) in [EMIm]NTf2, a cathodic current peak (Epc) was observed
at -0:39 V, corresponding to Rh3+/Rh, and two oxidation peaks were observed at -0:13V (Epa1) and
0:37V (Epa2) during the reverse scan. A significantly negative shift in the cathodic peak potential was observed
with the increase of the scan rate, indicating that the reduction of Pd(II) and Rh(III) on the Pt electrode involves
kinetic complications. By using the galvanostatic transient technique, the diffusion coefficients of Pd(II) and
Rh(III) in [EMIm]NTf2 ionic liquid solution were found to be  10-7 cm2/s. The potential difference between
the reduction of Pd(II) to Pd and the reduction of Rh(III) to Rh obtained from the CV curves of the Pd(II) and
Rh(III) co-existing [EMIm]NTf2 solution is found to be about 0:74 V, which makes it possible to electrodeposit
Pd(II) and Rh(III) separately.

Key words: Ionic liquids, Cyclic voltammogram, Palladium, Rhodium