Hybrid energy storage of battery-type nickel hydroxide and supercapacitor-type graphene: redox additive and charge storage mechanism. Issue 2 (8th March 2017)

• Record Type: Journal Article
• Authors: Sirisinudomkit, Pichamon; Iamprasertkun, Pawin; Krittayavathananon, Atiweena; Pettong, Tanut; Dittanet, Peerapan; Kidkhunthod, Pinit; Sawangphruk, Montree
• Is Part Of: Sustainable energy & fuels. Volume 1:Issue 2(2017)
• Page Start: 275
• Page End: 279
• Publication Date: 2017-03-08
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/c7se00052a
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : Charge storage mechanism by in situ X-ray absorption spectroscopy. 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 (K3 Fe(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)6 3− /Fe(CN)6 4− redox couple has a great electrochemical reversibility in nature since Fe(CN)6 3− can obtain electrons from Ni(OH)2 through the reduction process and Fe(CN)6 4− can donate electrons to NiOOH for the oxidation process. The HES reported herein may be practically used for high energy applications.