Electrochemical behavior of nanostructured nickel phthalocyanine (NiPc/C) for oxygen reduction reaction in alkaline media

Autor: Xuejun Zhou, Lei Ding, Hui Li, Haijang Wang, Qing Xin, Jinli Qiao
Rok vydání: 2012
Předmět:
Thermogravimetric analysis
Cyclic voltammetry
Catalyst structures
Heat-treatment effects
X ray diffraction
X ray photoelectron spectroscopy
General Chemical Engineering
Inorganic chemistry
Linear sweep voltammetry
Rotating disks
Electrochemistry
Milling procedures
Nitrogen compounds
Heat treatment temperature
Oxygen reduction reaction
Catalysis
Electrolytes
Electron transfer
Nanoparticle catalysts
X-ray photoelectron spectroscopy
Electrochemical behaviors
Nickel
Remarkable impact
Materials Chemistry
Rotating disk electrodes
Rotating disk electrode
Alkaline media
Nano-structured
XPS analysis
Catalysts
Chemistry
Electrolytic reduction
Activity enhancement
Alkaline electrolytes
Proton exchange membrane fuel cells (PEMFC)
Nickel phthalocyanines
Electron transitions
Onset potential
Half-wave potential
Number of electrons
Electrocatalytic activity
Electron transfer mechanisms
Synthesis (chemical)
Transmission electron microscopy
Photoelectrons
Zdroj: Journal of Applied Electrochemistry. 43:43-51
ISSN: 1572-8838
0021-891X
DOI: 10.1007/s10800-012-0503-4
Popis: Carbon-supported nickel phthalocyanine (NiPc/C) nanoparticle catalysts have been synthesized by a simple solvent-impregnation and milling procedure, then heat-treated at 600, 700, 800 and 900 °C to optimize their activity for the oxygen reduction reaction (ORR). The electrocatalytic activity and electron transfer mechanism of NiPc/C catalysts were demonstrated in oxygen-saturated alkaline electrolyte by cyclic voltammetry, linear sweep voltammetry as well as rotating disk electrode techniques, respectively. The results show that the heat-treatment temperature has a remarkable impact on the ORR activity of NiPc/C. An onset potential of 0.05 V and a half-wave potential of -0.15 V are achieved in 0.1 M KOH after the catalyst was heat-treated at 800 °C. In addition to an increase in ORR kinetics, the number of electrons transferred for ORR also increased from 2.2 to 2.8 with increasing heat-treatment temperature from 600 to 800 °C. To understand the heat-treatment effect, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy (XPS) were used to identify the catalyst structure and composition. From XPS analysis, pyridinic-N and graphitic-N were clearly observed after the sample was heat-treated at 800 °C. Both of these species might be assigned to sites catalytically active toward the ORR leading to activity enhancement. © 2012 Springer Science+Business Media Dordrecht.
Databáze: OpenAIRE
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