Journal
CHEMICAL ENGINEERING JOURNAL
Volume 294, Issue -, Pages 193-201Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.02.078
Keywords
OER; Electrocatalyst; Porous carbon microspheres; Starch
Categories
Funding
- National Science Foundation of China [U1401246, 51474110, 51474077, 21443006]
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A temperature-controlled water-swelling and catalytic graphitization associated strategy has been demonstrated for the sustainable synthesis of perfect Co nanoparticles-wrapped graphited carbon micro spheres (Co@GCMs) from a green precursor of corn starch at a relatively low temperature. This strategy results in a relatively high degree of graphitization for GCMs at 900 degrees C and excellent microsphere structure succeeded from the precursor. The Co nanoparticles were well enwrapped by porous graphited carbon nanofilms which have been grown on the surface of GCMs. Such a unique Co@GCMs hybrid architecture could afford a very high catalytic activity as well as a desirable electrochemical stability for the oxygen evolution reaction (OER). The Co@GCMs sample sintered at 900 degrees C shows an ideal onset potentials of 1.36 V and a very high catalytic current density of 6.43 A g(-1) at 1.60 V potential, which demonstrates a positive application prospect of this hybrid material. (C) 2016 Elsevier B.V. All rights reserved.
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