Tai Thien Huynh,Hau Quoc Pham,At Van Nguyen,Vi Thuy Thi Phan,Anh Tram Ngoc Mai,Trinh Duy Nguyen,Dai-Viet N. Vo,Van Thi Thanh Ho
The novel nanostructured Ti 0.9 Ir 0.1 O 2 acting as a potential catalyst support for Pt in fuel cell applications was easily synthesized by means of a facile and simple low-temperature hydrothermal process without using any surfactants and further heat treatment. Interestingly, even in low iridium doping concentration, the Ti 0.9 Ir 0.1 O 2 support possessed the high electronic conductivity of 0.016 S/cm, which was ∼10 5 times as high as pure TiO 2 (4.15 × 10 −7 S/cm), suggesting the efficient doping of iridium into TiO 2 lattice. Furthermore, the modified chemical reduction route utilized to prepare the 20 wt % Pt/Ti 0.9 Ir 0.1 O 2 electrocatalyst exhibited the good anchoring and uniform distribution of Pt nanoparticles (NPs) (∼3 nm) over Ti 0.9 Ir 0.1 O 2 surface and thus eventually resulted in the high electrochemical surface area (∼85.08 m 2 /gPt) compared to that of the commercial 20 wt % Pt/C (E-TEK) catalyst (∼69.21 m 2 /gPt). The cyclic voltammetry results in the methanol media revealed that the 20 wt % Pt/Ti 0.9 Ir 0.1 O 2 displayed the superior electrocatalytic activity compared to the 20 wt % Pt/C (E-TEK) catalyst towards the methanol electro-oxidation. For instance, the 20 wt % Pt/Ti 0.9 Ir 0.1 O 2 catalyst possessed the higher oxidation current density (∼28.8 mA/cm 2 ), the lower onset potential (∼0.12 V) and the higher I f /I b ratio in comparison with the commercial 20 wt % Pt/C (E-TEK) catalysts. It is worth noting that the chronoamperometry results also indicated that the 20 wt % Pt/Ti 0.9 Ir 0.1 O 2 exhibited higher durability than the commercial 20 wt % Pt/C (E-TEK) catalyst. Beside introducing novel Ti 0.9 Ir 0.1 O 2 material, these results also offer a pathway of exploring the low dopants content of Ti x Ir 1-x O 2 material to serve as a good catalyst support for many fuel cell applications.
Hien T Q Pham,Hau Quoc Pham,Quyen Huynh,Thao Ngoc Nguyen,Ngoc-Han T Huynh,Thanh-Quang Nguyen,Tai Thien Huynh
Constructing robust support plays a key role in governing the overall catalytic efficiency of metal-based catalysts for electrochemical reactions in sustainable energy-related conversion systems. We herein use a solvothermal method to assemble Ti0.9Ir0.1O2-Activated C composites, exhibiting high surface area and electrical conductivity compared to the pure TiO2 material. The material characterisations and electrochemical behaviours of the as-obtained composites are systemically studied by XRD, FE-SEM-EDX mapping, FT-IR, XPS, BET, four-point technique, cyclic voltammetry, etc Notably, the effect of composition on the physical and electrochemical properties of the as-made composites is also explored, which indicated the significant improvement in surface area and electrical conductivity with increasing carbon content, while a reverse trend is observed in the electrochemical durability. Among all studied composites, the Ti0.9Ir0.1O2-Activated C (50:50 wt%) composite can be a suitable support for metal-based catalysts due to its balance in physical properties (electrical conductivity of 1.5 S cm−1 and surface area of 152.12 m2 g−1) and electrochemical corrosion resistance (high durability after 2000-cycling ADT). This study can open up an efficient strategy to enhance the catalytic performance of electrochemical processes.
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