Preparation of Nonprecious Metal Electrocatalysts for the Reduction of Oxygen Using a Low-Temperature Sacrificial Metal
| Autor: | Yu Zhou, Andrew A. Gewirth, Cheng-Jun Sun, Xi Yin, Pinshane Y. Huang, Piotr Zelenay, Talha Al-Zoubi, Blanka Janicek, Xiaohui Zhang, Charles E. Schulz, Hong Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Chemistry
fungi Inorganic chemistry chemistry.chemical_element General Chemistry 010402 general chemistry Electrocatalyst 01 natural sciences Biochemistry Nitrogen Oxygen Catalysis 0104 chemical sciences Sacrificial metal Metal Colloid and Surface Chemistry visual_art visual_art.visual_art_medium Oxygen reduction reaction Pyrolysis Carbon |
| Zdroj: | Journal of the American Chemical Society. 142:5477-5481 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.9b11061 |
| Popis: | Non-platinum group metal (non-PGM) electrocatalysts for the oxygen reduction reaction (ORR) are generally composed of iron, nitrogen, and carbon synthesized through high-temperature pyrolysis. Among the various types of precursors, metal-organic frameworks (MOFs), zeolitic imidazolate framework (ZIF)-8 in particular, have often been used in the synthesis. The pyrolysis of ZIF-8 precursor relies on the use of Zn as a sacrificial metal (SM), and the optimal processing temperatures often exceed 1000 °C to generate active non-PGM catalysts. The high pyrolysis temperature tends to result in heterogeneous active moieties ranging from Fe single atoms to nanoparticles. In this study, we present the synthesis of non-PGM catalysts using Cd as the sacrificial metal instead of Zn. By using Cd, we were able to generate active non-PGM electrocatalysts from the MOF precursors at a low pyrolysis temperature of 750 °C, which helps preserve the single atomic iron active sites. |
| Databáze: | OpenAIRE |
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