4 years ago

Metal–Organic Framework-Derived FeCo-N-Doped Hollow Porous Carbon Nanocubes for Electrocatalysis in Acidic and Alkaline Media

Metal–Organic Framework-Derived FeCo-N-Doped Hollow Porous Carbon Nanocubes for Electrocatalysis in Acidic and Alkaline Media
Shu-Hong Yu, Xinzuo Fang, Hai-Long Jiang, Long Jiao
Metal–organic frameworks (MOFs) are ideal precursors/ templates for porous carbons with homogeneous doping of active components for energy storage and conversion applications. Herein, metalloporphyrinic MOFs, PCN-224-FeCo, with adjustable molar ratio of FeII/CoII alternatively residing inside the porphyrin center, were employed as precursors to afford FeCo-N-doped porous carbon (denoted as FeCo-NPC) by pyrolysis. Thanks to the hollow porous structure, the synergetic effect between highly dispersed FeNx and CoNx active sites accompanied with a high degree of graphitization, the optimized FeCo2-NPC-900 obtained by pyrolysis at 900 °C exhibits more positive half-wave potential, higher diffusion-limited current density, and better stability than the state-of-the-art Pt/C, under both alkaline and acidic media. More importantly, the current synthetic approach based on MOFs offers a rational strategy to structure- and composition-controlled porous carbons for efficient electrocatalysis. Double-sided cubes: Porphyrinic metal–organic frameworks are employed to produce hollow porous carbon nanocubes with homogeneous FeNx and CoNx dopants by pyrolysis. Thanks to this particular structure, high surface area and synergetic contributions between FeNx and CoNx, the optimized FeCo2-NPC-900 exhibits excellent activity, long-term stability, and MeOH tolerance, surpassing the Pt/C, toward oxygen reduction electrocatalysis in both acidic and alkaline media.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700864

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