Tai Thien Huynh,Hau Quoc Pham,At Van Nguyen,Long Giang Bach,Van Thi Thanh Ho
Developing robust catalysts is still challenging for further commercialization of low-temperature fuel cell technologies. In this study, we introduce platinum nanocatalyst loading on Ti0.7Ir0.3O2 to assemble a robust Pt/Ti0.7Ir0.3O2 catalyst toward the methanol oxidation reaction (MOR) in direct methanol fuel cell systems. These observational results demonstrated that the Pt/Ti0.7Ir0.3O2 catalyst is a promising anodic electrocatalyst due to the superior electrocatalytic activity and durability toward MOR, which was exhibited from the onset potential of ∼0.1 V and high current density of ∼21.69 mA/cm2 versus that of the state-of-the-art Pt/C (E-TEK) catalyst. We also demonstrated the electronic transfer from the Ti0.7Ir0.3O2 catalyst support to Pt NPs resulting in the modified surface electronic structure of Pt NPs, which could be the reason for the high activity and durability of the Pt/Ti0.7Ir0.3O2 catalyst. In addition, this approach could supply a promising potential catalyst for fuel cell technology and other applications such as solar cells, biosensors, and water splitting.
At Van Nguyen,Tai Thien Huynh,Hau Quoc Pham,Vi Thuy Thi Phan,Son Truong Nguyen,Van Thi Thanh Ho
Late transition metal doped TiO 2 has been exploited for generating efficient catalyst support by enhancing electrical conductivity and modifying properties of TiO 2 . The Ti 0·7 Ir 0·3 O 2 nanorod (NRs), a novel catalyst support for Pt nanoparticles , was prepared for the first time via single-step hydrothermal process at low temperature using IrCl 3 ·3H 2 O and TiCl 4 as starting materials. We found that the Ti 0·7 Ir 0·3 O 2 NRs with 70–80 nm in length and 25–30 nm in width is successful prepared at 210 °C for 12 h without utilizing surfactants or stabilizers . In addition, the Ti 0·7 Ir 0·3 O 2 NRs was presented principally as a single-phase solid with the TiO 2 is in the rutile form with high crystallinity without using further treatment after synthesis. More importantly, we found that the Ti 0·7 Ir 0·3 O 2 NRs possesses high electrical conductivity (0.028 S cm −1 ) dealing the intrinsically non-conducted drawback of TiO 2 . The Pt nanoparticles were then deposited on the support of Ti 0·7 Ir 0·3 O 2 NRs via chemical reduction method. The properties of 20 wt % Pt/Ti 0·7 Ir 0·3 O 2 NRs electrocatalyst were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), the cyclic voltammetry (CV). The uniformly distributed small Pt nanoparticles (3–4 nm diameter) were well adhered to the Ti 0·7 Ir 0·3 O 2 NRs. The electrochemically active surface area (ECSA) of 20 wt % Pt/Ti 0·7 Ir 0·3 O 2 NRs was higher than that of the commercial 20 wt % Pt/C (E-TEK) due to the small size and good dispersion of Pt nanoparticles on the surface of Ti 0·7 Ir 0·3 O 2 NRs. Moreover, the ECSA value of the Pt/Ti 0·7 Ir 0·3 O 2 NRs retained up to 88% after 2000 cycles of cyclic voltammetry, suggesting the high stability of catalyst resulted from strong metal support interaction (SMSI) of Titania-based materials with the noble metals. More importantly, the onset potential of Pt/Ti 0·7 Ir 0·3 O 2 NRs catalyst towards oxygen reduction reaction is more positive (∼80 mV) compared to commercial Pt/C, indicating the high catalytic activity of the Pt/Ti 0·7 Ir 0·3 O 2 NRs catalyst. The results of this research suggested that novel Ti 0·7 Ir 0·3 O 2 NRs could be applied as promising robust non-carbon support for Pt. This research also creates a preliminary step for investigating systematically promising Iridium doped Titania materials.
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