Ammonia-treated brown coal and its activity for oxygen reduction reaction in polymer electrolyte fuel cell
| Autor: | Mitsuyoshi Muraoka, Hiroyuki Tomonaga, Masatoshi Nagai |
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| Rok vydání: | 2012 |
| Předmět: |
Rotating ring-disk electrode
Chemistry business.industry General Chemical Engineering Organic Chemistry Inorganic chemistry technology industry and agriculture Energy Engineering and Power Technology Electrolyte Electrochemistry complex mixtures Catalysis Ammonia chemistry.chemical_compound Fuel Technology Adsorption Coal business BET theory |
| Zdroj: | Fuel. 97:211-218 |
| ISSN: | 0016-2361 |
| Popis: | Coal has been utilized as a nonprecious metal catalyst for the oxygen reduction reaction (ORR) in a polymer electrolyte fuel cell. The Australia brown coal was nitrogen-doped at 673–1123 K in a stream of NH 3 . The raw and NH 3 -treated Australia brown coals were characterized on the basis of their N 2 adsorption, Raman spectroscopy and X-ray photoelectron spectroscopy. The nitrogen doping of the coal at 1073 K increased the BET surface area from 10 to 671 m 2 /g having 95% slit-shaped micropores with a type I monolayer adsorption. The nitrogen-doped coal at 1073 K exhibited the highest potential of 0.85 V vs. RHE (at −0.005 mA/cm 2 ), which was evaluated by three-electrode electrochemical measurements using a rotating ring disk electrode in a 0.5 M H 2 SO 4 aqueous solution. The ORR activity of the nitrogen-doped coal was related to the pyridine-N species, microporosity and degree of disordered carbons in the coal. The iron addition to the coal from 10 to 10 3 ppm increased the ORR onset potential. The active structure of the coal-derived catalyst was discussed based on the results of the XPS, Raman, N 2 adsorption and iron effect. |
| Databáze: | OpenAIRE |
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