کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1279066 1497656 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrocatalytic activities of nanocomposite Ni81P16C3 electrode for hydrogen evolution reaction in alkaline solution by electrochemical impedance spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrocatalytic activities of nanocomposite Ni81P16C3 electrode for hydrogen evolution reaction in alkaline solution by electrochemical impedance spectroscopy
چکیده انگلیسی

Kinetics of hydrogen evolution reaction (HER) was studied in 1 M NaOH at 298 K on nickel–phosphorous–carbon (Ni81P16C3)(Ni81P16C3) composite electrode. Evaluation of the electrode activities was carried out by steady-state polarization Tafel curves, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV).The kinetic parameters obtained by Tafel curves revealed that Ni–P composites modified by incorporation of carbon from L-lysine source during the electroplating process were active toward the HER. Thus, to study more precisely the electrode activities, the EIS measurements were performed. A surface roughness factor (Rf)(Rf) more than three orders of magnitude was obtained for the Ni81P16C3Ni81P16C3 electrode. The HER rate constants were estimated using Tafel-impedance data assuming the Volmer–Heyrovský path. Analysis of the RfRf in conjunction with the values obtained for rate constantans showed that the increase in activity of the electrode was originated by 18% from increase in RfRf and by 82% from increase in the intrinsic activity (synergetic effect). Microstructure and composition of the electrodes were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), and elemental microanalysis (EDX).Besides the good electrocatalytic activity, excellent chemical and electrochemical stability was observed for Ni81P16C3Ni81P16C3 composite electrode toward the HER.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 33, Issue 10, May 2008, Pages 2468–2476
نویسندگان
, ,