Details

Autor(en) / Beteiligte

• Phan, Vi Thuy Thi
• Pham, Toan Minh
• Pham, Hau Quoc
• Huynh, Tai Thien
• Nguyen, Thi Hong Tham
• Ho, Van Thi Thanh

Titel

Low‐dose Ir‐doped TiO2 supported Pt‐Co bimetallic nanoparticles: A highly active and CO‐tolerant electrocatalyst towards methanol oxidation reaction

Ist Teil von

• International journal of energy research, 2022-10, Vol.46 (13), p.19221-19232

Ort / Verlag

Chichester, UK: John Wiley & Sons, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library

Beschreibungen/Notizen

• 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 Pt3Co1 alloy nanoparticles (NPs) on robust Ti0.9Ir0.1O2 supports utilizing a modified reduction method that used NaBH4 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 Pt3Co1/Ti0.9Ir0.1O2 catalyst are ~0.1 V vs NHE and 316.16 mA/mgPt, 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/mgPt, indicating superior catalytic activity and CO‐tolerance of the former over the latter. Furthermore, the superior anti‐poisoning ability and stability of the Pt3Co1/Ti0.9Ir0.1O2 catalyst are demonstrated by its 2.2‐fold higher If/Ib 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 Ti0.9Ir0.1O2 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 TiO2 as a catalyst support play a decisive role in boosting electrochemical behaviors of the Pt3Co1/ Ti0.9Ir0.1O2 catalyst. Generally, the success of this work in synthesizing high‐performance Pt3Co1/Ti0.9Ir0.1O2 catalyst could serve as groundwork for further development of TiO2‐based material supported bimetallic catalysts for applications in the electrochemical catalysis field. For the first time, the Pt3Co1 alloy nanoparticles were deposited on the robust Ti0.9Ir0.1O2 support in this work. The Pt3Co1/Ti0.9Ir0.1O2 catalyst exhibits great catalytic activity, anti‐poisoning ability and stability for methanol oxidation reaction. The  improved electrocatalytic performance of the Pt3Co1/Ti0.9Ir0.1O2 catalyst versus the commercial Pt/C (E‐TEK) catalyst are ascribed to both the internal synergistic effect within the Pt‐Co alloy and the strong interplay between the alloy and the Ti0.9Ir0.1O2 support.