Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6604144 | Electrochimica Acta | 2018 | 36 Pages |
Abstract
Coconut leaf sheath-derived nitrogen doped carbon framework is developed and incorporated with nickel and cobalt metal nanoparticles in the carbon matrix by a facile process of growing ZIF-67 metal organic framework particles on the graphitised carbon, followed by annealing it in inert atmosphere. Various parameters are modified to obtain three different samples. These samples are tested for high performance supercapacitors and oxygen evolution reaction (OER) catalysts. The optimised sample NiCoC-1 gave a high specific capacity of 308â¯mAh gâ1 at a current density of 1â¯Aâ¯gâ1 in a 2â¯M KOH electrolyte. An asymmetric supercapacitor assembly prepared from NiCoC-1 as the positive electrode and the nitrogen-doped carbon as the negative electrode, exhibited an energy density of up to 31.8â¯Wh Kgâ1 for a high power density of 6.2â¯kWâ¯kgâ1 over a potential window of 0-1.55â¯V. Two of our best samples were also tested for OER, giving good water oxidation kinetics, revealed by their lower Tafel slopes of around 107â¯mV and a low over potential (η) of around 420â¯mVâ¯at a current density of 10â¯mAâ¯cmâ2. Hence, this work opens great avenues for biomass-derived materials for high performance supercapacitors and catalysis.
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Authors
Anjali Jayakumar, Rajini P. Antony, Jun Zhao, Jong-Min Lee,