Effects of the nickel oxide on the hydrogen evolution and para-nitroaniline reduction at Ni-deposited graphite electrodes in NaOH

Chi Chang Hu, Ten Chin Wen

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25 Citations (Scopus)

Abstract

The reduction of p-nitroaniline (PNA) by electrocatalytic hydrogenation (ECH) as well as the evolution and adsorption of hydrogen were found to be depressed by the formation of irreducible β-Ni(OH)2 or NiO at nickel-deposited graphite (Ni/C) electrodes. An increase in the Tafel slope from 120 to 200 mV dec-1 in the low overpotential region of the hydrogen evolution reaction (HER) suggested that: (i) the HER mechanism on β-Ni(OH)2/NiO is different from the Volmer-Heyrovsky-Tafel reactions or (ii) the reduction of these oxides predominates in this potential range. X-ray diffraction (XRD) results revealed that NiO was formed on the Ni/C electrode surface after it had been annealed in air at 400 °C for 1 h. High-performance liquid chromatography (HPLC) results revealed that on the Ni/C electrodes before and after annealing treatment and on the pure Pt electrode, p-phenylenediamine (PPDA) is one of the major products in the PNA reduction and the selectivity of PPDA formation is the highest on pure Pt.

Original languageEnglish
Pages (from-to)1747-1756
Number of pages10
JournalElectrochimica Acta
Volume43
Issue number12-13
DOIs
Publication statusPublished - 1998 May 5

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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