Issue 2, 2017

Hybrid energy storage of battery-type nickel hydroxide and supercapacitor-type graphene: redox additive and charge storage mechanism

Abstract

Herein, hybrid energy storages (HESs) of battery-type Ni(OH)2 and supercapacitor-type electrochemically reduced graphene oxide (ERGO) were fabricated using potassium ferricyanide (K3Fe(CN)6) as a redox additive in KOH electrolyte for high specific energy and power applications. The as-fabricated HES of Ni(OH)2//ERGO in a single coin cell (CR2016) size in 4 mM K3[Fe(CN)]6 in 1 M KOH provides a wide working voltage up to 1.6 V and exhibits a maximum specific energy of 85 W h kg−1 at the specific power of 726 W kg−1 with a high capacity retention over 88% after 10 000 cycles, while the HES in 1 M KOH provides a lower maximum specific energy of 61 W h kg−1. A Fe(CN)63−/Fe(CN)64− redox couple has a great electrochemical reversibility in nature since Fe(CN)63− can obtain electrons from Ni(OH)2 through the reduction process and Fe(CN)64− can donate electrons to NiOOH for the oxidation process. The HES reported herein may be practically used for high energy applications.

Graphical abstract: Hybrid energy storage of battery-type nickel hydroxide and supercapacitor-type graphene: redox additive and charge storage mechanism

Supplementary files

Article information

Article type
Paper
Submitted
27 Jan 2017
Accepted
23 Feb 2017
First published
23 Feb 2017

Sustainable Energy Fuels, 2017,1, 275-279

Hybrid energy storage of battery-type nickel hydroxide and supercapacitor-type graphene: redox additive and charge storage mechanism

P. Sirisinudomkit, P. Iamprasertkun, A. Krittayavathananon, T. Pettong, P. Dittanet, P. Kidkhunthod and M. Sawangphruk, Sustainable Energy Fuels, 2017, 1, 275 DOI: 10.1039/C7SE00052A

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