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Carboxyl Multiwalled Carbon‐Nanotube‐Stabilized Palladium Nanocatalysts toward Improved Methanol Oxidation Reaction
Author(s) -
Wang Yiran,
He Qingliang,
Guo Jiang,
Wei Huige,
Ding Keqiang,
Lin Hongfei,
Bhana Saheel,
Huang Xiaohua,
Luo Zhiping,
Shen T. D.,
Wei Suying,
Guo Zhanhu
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402378
Subject(s) - nanomaterial based catalyst , catalysis , methanol , palladium , carbon nanotube , raman spectroscopy , x ray photoelectron spectroscopy , adsorption , materials science , thermal decomposition , dispersion (optics) , hydroxide , inorganic chemistry , chemistry , chemical engineering , nuclear chemistry , organic chemistry , nanotechnology , physics , engineering , optics
Carboxyl‐functionalized multiwalled carbon nanotubes (MWNT‐COOH) decorated with palladium (Pd) nanoparticles (NPs, Pd–MWNT‐COOH) are prepared by using a one‐pot thermal decomposition method without addition of reductant or surfactant. An increased ratio of the D band to G band in Raman spectra and a decreased ratio of oxygen‐containing groups measured using X‐ray photoelectron spectroscopy suggest the interaction between Pd NPs and carboxyl groups in Pd–MWNT‐COOH. TEM studies reveal improved dispersion of Pd NPs after introducing MWNT‐COOH or MWNTs; the carboxyl groups act as anchors to perfectly disperse Pd NPs in Pd–MWNT‐COOH, which is responsible for the highest peak current of Pd–MWNT‐COOH for the methanol oxidation reaction. The best catalytic performance is observed in conditions that afford a balanced adsorption between hydroxide and methanol through varying the concentrations of methanol and KOH. Increasing temperature can also improve the catalyst performance due to enhanced reaction kinetics.