Hybrid energy storage of battery-type nickel hydroxide and supercapacitor-type graphene: redox additive and charge storage mechanism
Literature Information
Atiweena Krittayavathananon, Peerapan Dittanet, Pinit Kidkhunthod, Montree Sawangphruk
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.
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