Ni-coated graphite felt modified with Ag nanoparticles A new electrode material for electro-reductive dechlorination

Abstract : Reductive removal of the organochlorine herbicide alachlor on Ni-coated graphite felt modified with Ag nanoparticles (Ag/Ni@GF) was studied. Ag/Ni@GF was prepared by spontaneous deposition of silver onto Ni-coated graphite felt (Ni@GF), which was previously obtained by electrodeposition of Ni onto graphite felt (GF). Interestingly, Ag/Ni@GF exhibited a high specific surface area of 26 m2 g−1 determined by the Brunauer-Emmett-Teller (BET) method and a high Ag loading of 13.7 mg cm−3 as shown by electrochemical analyses. Alachlor (50 mg L−1 in 0.05 M NaOH) was successfully reduced at −0.9 V vs. mercury-mercurous sulfate electrode with 96% conversion efficiency and a current efficiency up to 33%. The main by-product was its dechlorinated derivative, deschloroalachlor, obtained with 76% yield. Surface-enhanced Raman scattering (SERS) showed that PVP, necessary to control Ag nanoparticles deposition, does not affect the catalytic activity of Ag. Ag/Ni@GF electrodes could be used several times, highlighting their good stability. © 2019 Elsevier B.V.
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Submitted on : Monday, September 9, 2019 - 1:56:07 PM
Last modification on : Tuesday, September 10, 2019 - 1:20:04 AM

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Y.-Y. Lou, W. He, E. Verlato, M. Musiani, D. Floner, et al.. Ni-coated graphite felt modified with Ag nanoparticles A new electrode material for electro-reductive dechlorination. Journal of Electroanalytical Chemistry, 2019, 849, pp.113357. ⟨10.1016/j.jelechem.2019.113357⟩. ⟨hal-02281676⟩

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