Microbial synthesis of highly dispersed nano-Pd electrocatalyst for oxygen reduction reaction
| Autor: | Shaohui Zhang, Feng Liu, Xueduan Liu, Zhiyong Xie, Xiaoting Deng, Wenying Tian, Haikun Zhou, Jingwen Huang, Qingxin Li, Wei Xuan, Liang Yili |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
biology
Hydrogen Renewable Energy Sustainability and the Environment Carbonization Chemistry Energy Engineering and Power Technology Proton exchange membrane fuel cell chemistry.chemical_element 02 engineering and technology Shewanella putrefaciens 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst biology.organism_classification 01 natural sciences 0104 chemical sciences Catalysis Fuel Technology Chemical engineering Nano 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | International Journal of Hydrogen Energy. 46:26886-26896 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2021.05.163 |
| Popis: | Microbial fabrication is eco-friendly for nobel-metal catalysts typically used in proton exchange membrane fuel cell (PEMFC). In our study, nano-Pd electrocatalysts were successfully prepared by using three Shewanellas as precursors through hydrogen reduction (200 °C) and carbonization (800 °C). The analysis revealed that the catalysts showed outstanding ORR electrocatalytic performance via a predominant four-electron oxygen reduction pathway in alkaline medium. The best performance was obtained for Pd/HNC-32, which showed a mass activity at 0.526 A mg−1, 3.78 times higher than that of commercial Pd/C. Shewanella putrefaciens CN-32 was a more effective Pd-adsorbent. The enhanced performance can be ascribed to the small Pd-particle size and uniform dispersion on microbial support, which results from stronger hydrophilicity of Shewanella putrefaciens CN-32. The content of nitrogen is another key to the performance of Pd/HNC-32. This study developed a promising strategy for screening microbial strains for electrocatalyst fabrication. |
| Databáze: | OpenAIRE |
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