Corresponding Author

Hui-Min Meng(menghm16@126.com)


The relationship between the electrochemical activity of fuel cell catalysts and Pt particle size, as well as the catalyst support and co-catalyst is still unclear. In this work, FESEM, XRD, BET, TEM and CV techniques were adopted to investigate the effects of TiO2 anatase (A)/rutile (R) phases content on the electrochemical activity of Pt electrocatalyst. The results showed that the anatase-rutile phase transformation occurred during the heat treatment of TiO2 at 700 ~ 900 oC accompanied by the growth of two-phase crystalline size, and anatase was completely transformed into rutile at 900 oC. TEM results revealed that the ultrafine Pt electrocatalysts with the particle size of 1.8 ~ 2.8 nm were successfully prepared over the TiO2-CNx supports. The content of TiO2 (A)/(R) phases had a “volcano-type” effect on both the BET surface area of TiO2-CNx supports and the real “effective” electrochemical active surface area (ECSA) of Pt/TiO2-CNx catalysts. When the rutile content was 25%, the TiO2(25%R)-CNx support and Pt/TiO2(25%R)-CNx catalyst had the largest specific surface area and the most electrochemical active sites, respectively. It is speculated that raising the rutile content, there might be a strong metal-support interaction between Pt nanoparticles and TiO2(25%R)-CNx support with the rutile content of 25%, which could anchor the ultrafine Pt nanoparticles, resulting in the highest ECSA of Pt/TiO2(25%R)-CNx catalyst. Therefore, the Pt/TiO2(25%R)-CNx became more suitable as a catalyst for fuel cells.

Graphical Abstract


catalyst, TiO2, anatase, rutile, electrochemical active surface area

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