title: Pseudocapacitive performance of a solution-processed β-Co(OH)2electrode monitored through its surface morphology and area.
abstract: In the present study, beta-cobalt hydroxide (β-Co(OH)2) electrodes of various nanostructures and surface areas, viz. nano-rhombuses (NRs), nano-plates (NPs), and nano-grass (NGs), have been synthesized directly onto a stainless-steel (SS) substrate using a simple, economical and binder-free chemical solution-process, utilizing three cobalt precursor salts, i.e. cobalt acetate, cobalt chloride, and cobalt nitrate, respectively. Structural elucidation proves the crystallite size, type and phase-purity of β-Co(OH)2, whereas the surface morphology analysis supports the evolution of the above mentioned nanostructures of various surface areas. The electrochemical pseudocapacitor performance investigation demonstrates a specific capacitance (Sc) of 367 F g-1at 1 mA cm-2for the NP-type morphology, which is higher than that that displayed by the other morphologies. This change in Scvalue is attributed to different charge transfer resistance values, which have been obtained from electrochemical impedance spectroscopy spectra. Finally, we attempt to correlate the relationship between the surface morphology, i.e. surface area, and the charge transfer resistance with the obtained specific capacitance value of the respective electrode.
authors.affiliation: Department of Physics, Institute of Science, Nagpur, 440008, MS, India.
authors.forename: P S
authors.initials: PS
authors.lastname: Gaikar
authors.affiliation: Nanshan District Key Lab for Biopolymers and Safety Evaluation, College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, PR China.
authors.forename: S T
authors.identifier: http://orcid.org/0000-0003-4306-9377
authors.initials: ST
authors.lastname: Navale
authors.affiliation: Centre for Nanomaterials & Energy Devices, School of Physical Sciences, SRTM University, 431606, Nanded, India.
authors.forename: S L
authors.initials: SL
authors.lastname: Gaikwad
authors.affiliation: Centre for Nanomaterials & Energy Devices, School of Physical Sciences, SRTM University, 431606, Nanded, India.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Al-Osta
authors.affiliation: Centre for Nanomaterials & Energy Devices, School of Physical Sciences, SRTM University, 431606, Nanded, India.
authors.forename: V V
authors.initials: VV
authors.lastname: Jadhav
authors.affiliation: Department of Physics, Institute of Science, Nagpur, 440008, MS, India.
authors.forename: P R
authors.initials: PR
authors.lastname: Arjunwadkar
authors.affiliation: Department of Chemistry, College of Science, King Saud University, Bld#5, Riyadh, Saudi Arabia. rajarammane70@srtmun.ac.in.
authors.forename: Mu
authors.initials: M
authors.lastname: Naushad
authors.affiliation: Centre for Nanomaterials & Energy Devices, School of Physical Sciences, SRTM University, 431606, Nanded, India and Department of Chemistry, College of Science, King Saud University, Bld#5, Riyadh, Saudi Arabia. rajarammane70@srtmun.ac.in.
authors.forename: Rajaram S
authors.identifier: http://orcid.org/0000-0002-9624-7985
authors.initials: RS
authors.lastname: Mane