کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1279315 1497580 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen evolution reaction in PTFE bonded Raney-Ni electrodes
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Hydrogen evolution reaction in PTFE bonded Raney-Ni electrodes
چکیده انگلیسی

This study is concerned with the hydrogen evolution reaction (HER) in several PTFE bonded Raney-Ni electrodes as function of temperature and treatments. The Mo-doped Raney-Ni catalysts are activated by hours of long cathodic polarization interleaved with few deep “charge – discharge” (polarity reversal) cycles. Moreover, the HER efficiency of the electrode requires additives which enhance conductivity and surface properties: with powders of Ni alloys (Ni–Ti, Ni–Cr, Ni–Fe) the electrode becomes also more stable, and almost insensitive to polarity reversal. The main effect of a temperature increase is the reduction of the Tafel slope, which is about 120 mV/dec at 25 °C, and about 60 mV/dec at 60 °C. A proper choice of additives yield electrodes which withstand polarity reversal and may be used in electrolysers which are intermittently operated, or have anodes which require periodic in situ re-activation by reduction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 36, Issue 13, July 2011, Pages 7816–7821
نویسندگان
, , , , , , , ,