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

doi:10.1016/S0013-4686(97)00312-5

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

Department of Chemical Engineering

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27 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 language	English
Pages (from-to)	1747-1756
Number of pages	10
Journal	Electrochimica Acta
Volume	43
Issue number	12-13
DOIs	https://doi.org/10.1016/S0013-4686(97)00312-5
Publication status	Published - 1998 May 5

All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Electrochemistry

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

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.",

author = "Hu, {Chi Chang} and Wen, {Ten Chin}",

note = "Funding Information: The financial support of this work, by the National Science Council of the Republic of China under contract no. NSC 84-0402-E006-004, is gratefully acknowledged. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

year = "1998",

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doi = "10.1016/S0013-4686(97)00312-5",

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AU - Hu, Chi Chang

AU - Wen, Ten Chin

N1 - Funding Information: The financial support of this work, by the National Science Council of the Republic of China under contract no. NSC 84-0402-E006-004, is gratefully acknowledged. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 1998/5/5

Y1 - 1998/5/5

N2 - 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.

AB - 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.

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

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