Identification of Catalytic Sites for Oxygen Reduction in Metal/Nitrogen-Doped Carbons with Encapsulated Metal Nanoparticles.

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ID: 72205
2019
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Abstract
The development of metal-N-C materials as efficient non-precious metal (NPM) catalysts for catalysing the oxygen reduction reaction (ORR) as alternatives to platinum is important for the practical use of proton exchange membrane fuel cells (PEMFCs). However, metal-N-C materials have high structural heterogeneity. As a result of their high-temperature synthesis they often consist of metal-N sites and graphene-encapsulated metal nanoparticles. Thus it is hard to identify the active structure of metal-N-C catalysts. Herein, we report a low-temperature NH Cl-treatment to etch out graphene-encapsulated nanoparticles from metal-N-C catalysts without destruction of co-existing atomically dispersed metal-N sites. Catalytic activity is much enhanced by this selective removal of metallic nanoparticles. Accordingly, we can confirm the spectator role of graphene-encapsulated nanoparticles and the pivotal role of metal-N sites in the metal-N-C materials for ORR in the acidic medium.
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Authors Chen, Ming-Xi;Zhu, Mengzhao;Zuo, Ming;Chu, Sheng-Qi;Zhang, Jing;Wu, Yuen;Liang, Hai-Wei;Feng, Xinliang;
Journal angewandte chemie (international ed in english)
Year 2019
DOI
10.1002/anie.201912275
URL
Keywords
fuel cells fe-n-c active sites encapsulated nanoparticles oxygen reduction reaction (orr)

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