Facile synthesis of Pd supported on Shewanella as an efficient catalyst for oxygen reduction reaction. (13th August 2019)

• Record Type: Journal Article
• Authors: Zhang, Shaohui; Deng, Xiaoting; Chen, Aijia; Zhou, Haikun; Xie, Zhiyong; Liang, Yili; Zeng, Fanhao
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 39(2019)
• Page Start: 21759
• Page End: 21768
• Publication Date: 2019-08-13
• Subjects: Pd supported on Shewanella -- Heteroatoms -- Carbonization -- Hydrogen reduction -- ORR catalyst; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.06.141
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: While noble metals loaded on carbon-based supports are commonly used as oxygen reduction catalysts for fuel cell cathodes, the preparation process is complicated and expensive cost. In this paper, Pd 2+ was first adsorbed on Shewanella by its adsorption characteristics, then the Pd supported on Shewanella catalyst was obtained after carbonization at 600 °C and hydrogen reduction at 200 °C. The Shewanella cells retain the rod shape of bacteria following pyrolysis under high temperatures, while N and Pd heteroatoms are uniform distribution on the carbon matrix. As a result, Pd supported on Shewanella catalyst exhibits excellent electrocatalytic activity for ORR via a dominant four-electron oxygen reduction pathway in alkaline medium. More importantly, the mass activity of the prepared catalyst was 5.8 times higher than that of commercial Pd/C, and its stability was also better than the Pd/C, which could be promising alternatives to costly Pt-based electrocatalysts for ORR. Graphical abstract: Image 1 Highlights: Synthesizing Pd catalysts supported on bacterium is facile and eco-friendly. Nitrogen doping can enhance the catalyst performance. The close contact between HNC and Pd can improve catalyst activity and stability. Pd/HNC catalysts show outstanding activity and stability than standard Pd/C.