Self-growth-templating synthesis of 3D N,P,Co-doped mesoporous carbon frameworks for efficient bifunctional oxygen and carbon dioxide electroreduction
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© 2017 The Royal Society of Chemistry. Although mesopore designs are expected to play a key role in exploring electrocatalytic properties of carbons, facile preparation of mesoporous carbons (MPCs) with efficient dopants to enable high performance remains a great challenge. Herein, we for the first time introduce a self-growth-templating concept for the fabrication of three-dimensional (3D) N,P,Co-doped MPC frameworks, simply through pyrolysis of vitamin B12 in NaCl assembly-enclosed nanoreactors. The route realizes the controllable formation of mesoporous templates and elimination of the templates, as well as in situ doping of N, P, and Co into MPCs in a one-step enclosed-space-assisted pyrolysis process. The highly mesoporous architecture not only enhances mass transportation but also provides the 3D electrocatalytic surface to expose highly active N,P,Co-induced dopants. These features endow MPCs with excellent activity as bifunctional electrocatalysts in oxygen reduction (E1/2 of 0.85 V, JK of 51 mA cm-2 at -0.71 V and Tafel slope of 53 mV dec-1) and CO2 reduction reactions (overpotential of -0.19 V, maximum FE of 62% for CO and Tafel slope of 129 mV dec-1), coupled with high electrochemical stability in aqueous electrolytes. We expect that the self-constructing vision can afford useful insights to guide the development of other advanced mesoporous materials other than carbon for broad applications.
author list (cited authors)
Pan, F., Liang, A., Duan, Y., Liu, Q., Zhang, J., & Li, Y.