Hierarchically porous carbons with optimized nitrogen doping as highly active electrocatalysts for oxygen reduction

Hai-Wei Liang, Xiaodong Zhuang, Sebastian Brüller, Xinliang Feng () and Klaus Müllen ()
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Hai-Wei Liang: Max-Planck-Institute for Polymer Research
Xiaodong Zhuang: School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University
Sebastian Brüller: Max-Planck-Institute for Polymer Research
Xinliang Feng: Max-Planck-Institute for Polymer Research
Klaus Müllen: Max-Planck-Institute for Polymer Research

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Development of efficient, low-cost and stable electrocatalysts as the alternative to platinum for the oxygen reduction reaction is of significance for many important electrochemical devices, such as fuel cells, metal–air batteries and chlor-alkali electrolysers. Here we report a highly active nitrogen-doped, carbon-based, metal-free oxygen reduction reaction electrocatalyst, prepared by a hard-templating synthesis, for which nitrogen-enriched aromatic polymers and colloidal silica are used as precursor and template, respectively, followed by ammonia activation. Our protocol allows for the simultaneous optimization of both porous structures and surface functionalities of nitrogen-doped carbons. Accordingly, the prepared catalysts show the highest oxygen reduction reaction activity (half-wave potential of 0.85 V versus reversible hydrogen electrode with a low loading of 0.1 mg cm−2) in alkaline media among all reported metal-free catalysts. Significantly, when used for constructing the air electrode of zinc–air battery, our metal-free catalyst outperforms the state-of the-art platinum-based catalyst.

Date: 2014
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DOI: 10.1038/ncomms5973

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