title: Layered Ni(OH)2-Co(OH)2films prepared by electrodeposition as charge storage electrodes for hybrid supercapacitors.
abstract: Consecutive layers of Ni(OH)2and Co(OH)2were electrodeposited on stainless steel current collectors for preparing charge storage electrodes of high specific capacity with potential application in hybrid supercapacitors. Different electrodes were prepared consisting on films of Ni(OH)2, Co(OH)2, Ni1/2Co1/2(OH)2and layered films of Ni(OH)2on Co(OH)2and Co(OH)2on Ni(OH)2to highlight the advantages of the new architecture. The microscopy studies revealed the formation of nanosheets in the Co(OH)2films and of particles agglomerates in the Ni(OH)2films. Important morphological changes were observed in the double hydroxides films and layered films. Film growth by electrodeposition was governed by instantaneous nucleation mechanism. The new architecture composed of Ni(OH)2on Co(OH)2displayed a redox response characterized by the presence of two peaks in the cyclic voltammograms, arising from redox reactions of the metallic species present in the layered film. These electrodes revealed a specific capacity of 762 C g-1at the specific current of 1 A g-1. The hybrid cell using Ni(OH)2on Co(OH)2as positive electrode and carbon nanofoam paper as negative electrode display specific energies of 101.3 W h g-1and 37.8 W h g-1at specific powers of 0.2 W g-1and 2.45 W g-1, respectively.
authors.affiliation: CQE - Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.|LMGP, Univ. Grenoble Alpes, CNRS, F-38000 Grenoble, France.
authors.forename: Tuyen
authors.initials: T
authors.lastname: Nguyen
authors.affiliation: LMGP, Univ. Grenoble Alpes, CNRS, F-38000 Grenoble, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Boudard
authors.affiliation: CQE - Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.|ESTSetúbal, Instituto Politécnico de Setúbal, 1959-007 Setúbal, Portugal.
authors.forename: M João
authors.initials: MJ
authors.lastname: Carmezim
authors.affiliation: CQE - Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: M Fátima
authors.initials: MF
authors.lastname: Montemor