Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 838, Issue -, Pages 7-15Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.02.022
Keywords
Methanol electro-oxidation reaction; Ni@3DHPG; Co@3DHPG; In situ grown
Categories
Funding
- National Natural Science Foundation [21506079, 21676129, 21777063]
- China Postdoctoral Science Foundation [2016M590421]
- Science & Technology Foundation of Zhenjiang [GY2016021, GY2017001, YE201709]
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Here we report, an efficient, cheap and simple strategy to obtain electrocatalysts for methanol electro-oxidation reactions. Nickel encapsulated 3-dimensional hierarchical porous graphene and cobalt encapsulated 3-dimensional hierarchical porous graphene composites are obtained by ion exchange/activation method. The well dispersion of nickel and cobalt nanoparticles are observed inside the nickel encapsulated 3-dimensional hierarchical porous graphene and cobalt encapsulated 3-dimensional hierarchical porous graphene composites respectively. Graphene layer over the metals nanoparticles may suppress metal corrosion and enhance their catalytic performance for methanol electro-oxidation reactions. Nickel encapsulated 3-dimensional hierarchical porous graphene exhibits low onset potential of 0.32 V (vs Ag/AgCl) and the highest current density of 147.108 mA cm(-2) at a low overpotential of 0.728 V (vs Ag/AgCl). Similarly, cobalt encapsulated 3-dimensional hierarchical porous graphene shows lower onset potential of 0.45 V (vs Ag/AgCl) and high current density of 10 mA cm(-2) at low overpotential of 0.62 V (vs Ag/AgCl). More importantly, better methanol electro-oxidation reaction was recorded in 1 M KOH and 0.75 M methanol solution with a scan rate of 50 mV s(-1). The nickel-containing electrocatalyst show better performance than cobalt based electrocatalyst under same conditions.
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