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Patil, Umakant M.,Sohn, Ji Soo,Kulkarni, Sachin B.,Lee, Su Chan,Park, Hyung Goo,Gurav, Kishor V.,Kim, J.H.,Jun, Seong Chan American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.4
<P>Chemical growth of mixed cobalt–nickel hydroxides (Co<SUB><I>x</I></SUB>Ni<SUB>1–<I>x</I></SUB>(OH)<SUB>2</SUB>), decorated on graphene foam (GF) with desirable three-dimensional (3D) interconnected porous structure as electrode and its potential energy storage application is discussed. The nanostructured Co<SUB><I>x</I></SUB>Ni<SUB>1–<I>x</I></SUB>(OH)<SUB>2</SUB> films with different Ni:Co (<I>x</I>) compositions on GF are prepared by using the chemical bath deposition (CBD) method. The structural studies (X-ray diffraction and X-ray photoelectron spectroscopy) of electrodes confirm crystalline nature of Co<SUB><I>x</I></SUB>Ni<SUB>1–<I>x</I></SUB>(OH)<SUB>2</SUB>/GF and crystal structure consists of Ni(OH)<SUB>2</SUB> and Co(OH)<SUB>2</SUB>. The morphological properties reveal that nanorods of Co(OH)<SUB>2</SUB> reduce in size with increases in nickel content and are converted into Ni(OH)<SUB>2</SUB> nanoparticles. The electrochemical performance reveals that the Co<SUB>0.66</SUB>Ni<SUB>0.33</SUB>(OH)<SUB>2</SUB>/GF electrode has maximum specific capacitance of ∼1847 F g<SUP>–1</SUP> in 1 M KOH within a potential window 0 to 0.5 V vs Ag/AgCl at a discharge current density of 5 A g<SUP>–1</SUP>. The superior pseudoelectrochemical properties of cobalt and nickel are combined and synergistically reinforced with high surface area offered by a conducting, porous 3D graphene framework, which stimulates effective utilization of redox characteristics and communally improves electrochemical performance with charge transport and storage.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-4/am404863z/production/images/medium/am-2013-04863z_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am404863z'>ACS Electronic Supporting Info</A></P>