Van Thi Thanh Ho,Dung Hung Chau,Khang Quang Bui,Ngan Thi Thanh Nguyen,Thi Kim Ngan Tran,Long Giang Bach,Son Nguyen Truong
TiO2-based photocatalysts still have some limitations such as large bandgap and low surface area, leading to low efficiency in the photocatalytic degradation of VOCs and limiting it to use in sunlight. Here we report that the nanostructured Ir-doped TiO2as an efficient photocatalyst generates an excellent risk-reduction material of gaseous toluene. We have succeeded in developing a nanostructured Ir-dopedTiO2and initially found that excellent efficient photocatalytic VOC decomposition can be achieved in our materials The nanostructured Ir-dopedTiO2was synthesized by a one pot, low temperature hydrothermal process with different ratios of Ir doped into theTiO2. It exhibited a high surface area, uniformly spherical morphology of 10–15 nm. Its activity for the photocatalytic degradation of gaseous toluene exhibited up to 97.5% under UV light. This enhancement could be explained by iridium doping which created a high concentration oxygen vacancy and changed the recombination rate of the photogenerated charge carriers. More generally, our study indicates a strategic way to develop the novel nanostructured material for numerous applications.Keywords:photocatalysts;Ir-doped TiO2;VOCs;toluene
Vi Thuy Thi Phan,Toan Minh Pham,Hau Quoc Pham,Tai Thien Huynh,Thi Hong Tham Nguyen,Van Thi Thanh Ho
Summary Highly stable and cost-effective electrocatalysts are of importance in regulating energy conversion efficiency and commercial feasibility of direct methanol fuel cells (DMFCs). So far, integrating transition metals into Pt-based catalysts to enhance their catalytic performances for methanol electro-oxidation reaction (MOR) at the anode of DMFCs has received significant interest. This study witnessed the first time of depositing Pt 3 Co 1 alloy nanoparticles (NPs) on robust Ti 0.9 Ir 0.1 O 2 supports utilizing a modified reduction method that used NaBH 4 as a reducing agent in the absence of surfactants or stabilizers. This novel combination not only reduces the usage of costly and easily-deactivated Pt but also significantly improves catalytic activity and poisoning tolerance for MOR. Regarding electrocatalytic performance, the onset potential and the mass activity of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are ~0.1 V vs NHE and 316.16 mA/mg Pt , respectively, which are 4.5-fold lower and 1.5-fold higher than the corresponding figures for the commercial Pt/C (E-TEK) catalyst, ~0.45 vs NHE and 206.83 mA/mg Pt , indicating superior catalytic activity and CO-tolerance of the former over the latter. Furthermore, the superior anti-poisoning ability and stability of the Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst are demonstrated by its 2.2-fold higher I f /I b ratio in MOR and lower degradation rate in the 60-min chronoamperometry (CA) and 3000-cycle scanning tests than the Pt/C counterpart. These enhancements could be abscribed to synergistic influence between the Pt-Co alloy NPs and the robust Ti 0.9 Ir 0.1 O 2 support. The addition of Co into the catalyst to promote removal of Pt-poisoning species as well as the use of highly corrosion-resistant Ir-doped TiO 2 as a catalyst support play a decisive role in boosting electrochemical behaviors of the Pt 3 Co 1 / Ti 0.9 Ir 0.1 O 2 catalyst. Generally, the success of this work in synthesizing high-performance Pt 3 Co 1 /Ti 0.9 Ir 0.1 O 2 catalyst could serve as groundwork for further development of TiO 2 -based material supported bimetallic catalysts for applications in the electrochemical catalysis field.
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