Preparation and characterization of Pt nanoparticles supported on a Fe‐doped hydroxyapatite‐activated Vulcan XC72 composite material

다국어 초록 (Multilingual Abstract)

In this research, the hydroxyapatite (HAp) could be directly deposited on carbon black (CB), which was the modified surface to generate more OH− free radicals to strengthen the bond between HAp and CB, before adding ((NH4)2Fe(SO4)2·6H2O) to engage the ion exchange with Fe2+ and Ca2+ to obtain FeHAp‐CB composites. The Pt nanoparticles were then reduced on the FeHAp‐CB composite surface to derive a Pt/FeHAp‐CB catalyst of dual function. The catalyst revealed a steep desorption peak at −0.180 V (vs Ag/AgCl) in a hydrogen oxidation reaction ascribed to the characteristics of Pt (110) facet and the CO detoxication function in the methanol oxidation reaction. The superior performance of Pt/FeHAp‐CB/CB catalyst was apparently related to the Pt (110) surface, the Fe concentration, and the homogeneous dispersion of Pt particles on the FeHAp‐CB composites. And, the ratio of coexisting Pt0 and Pt2+ within Pt/FeHAp‐CB/CB catalyst would definitely affect chemical stability and mass activity. By X‐ray photoelectron spectroscopy (XPS), it was found that a high quantity of Pt0 could improve mass activity, while a high quantity of Pt2+ contributed to chemical stability.









1. Hydroxyapatite (HAp) were exchanged with ferrous ion to form FeHAp‐CB as the support of Pt for finally deriving bifunctional Pt/FeHAp‐CB catalysts.
2. Breakthroughs occurred that this improved catalyst with the enhanced durability has revealed moreelectrochemical activity in the methanol oxidation reaction (MOR).
3. By XPS, it was found that a higher ratio of Pt0 to Pt+2 improved the more mass activity, while a lower one contributed to the more chemical stability.