Electrochemical Assessment of As-Deposited Co(OH) 2 by Electrochemical Synthesis: The Effect of Synthesis Temperature on Performance

Vladimir Parra-Elizondo, Ana Karina Cuentas-Gallegos, Beatriz Escobar-Morales, José Martín Baas-López, Jorge Alonso Uribe-Calderón and Daniella Esperanza Pacheco-Catalán
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Vladimir Parra-Elizondo: Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, A.C. Carretera Sierra Papacal-Chuburná Puerto Km 5, Sierra Papacal, 97302 Mérida, Yucatán, Mexico
Ana Karina Cuentas-Gallegos: Instituto de Energías Renovables, Universidad Nacional Autónoma de Mexico, Priv. Xochicalco S/N Temixco, 62580 Morelos, Mexico
Beatriz Escobar-Morales: Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, A.C. Carretera Sierra Papacal-Chuburná Puerto Km 5, Sierra Papacal, 97302 Mérida, Yucatán, Mexico
José Martín Baas-López: Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, A.C. Carretera Sierra Papacal-Chuburná Puerto Km 5, Sierra Papacal, 97302 Mérida, Yucatán, Mexico
Jorge Alonso Uribe-Calderón: Unidad de Materiales, Centro de Investigación Científica de Yucatán, A.C. Calle 43 No. 130 x 32 y 34 Col. Chuburná de Hidalgo, 97205 Mérida, Yucatán, Mexico
Daniella Esperanza Pacheco-Catalán: Unidad de Energía Renovable, Centro de Investigación Científica de Yucatán, A.C. Carretera Sierra Papacal-Chuburná Puerto Km 5, Sierra Papacal, 97302 Mérida, Yucatán, Mexico

Energies, 2019, vol. 12, issue 22, 1-17

Abstract: In this paper, the influence of an electrolytic temperature bath was used in the electrodeposition process on the size, color, and shape of the as-deposited Co(OH) 2 , and the electrochemical performance was investigated. Three different temperatures of 25, 60, and 95 °C were evaluated for the electrodeposition of Co(OH) 2 on stainless steel plates (SSP). The electrochemical performance of the as-deposited electrodes (SSP) was measured in a symmetric electrochemical cell (EC) arrangement. XRD, SEM, and N 2 physisorption analyses were carried out to evaluate the structure and morphological composition, along with the textural properties. Results showed that the hexagonal platelet micro-clusters of Co(OH) 2 are formed in a mixed composition of both α-Co(OH) 2 and β-Co(OH) 2 phases, with the α-Co(OH) 2 phase being the major phase formed in the electrodeposition process at temperatures below 95 °C, as suggested by the XRD analysis. Electrochemical cell performances were evaluated by galvanostatic cycling, results showed maximum areal capacity values of 1.97, 2.69, and 4.34 mA h cm −2 at a charge/discharge current of 6.25 mA cm −2 , for the as-deposited materials at 25, 60 and 95 °C, respectively. The specific power of the EC reached up to 19 kW kg −1 for the EC obtained material at 60 °C, with a specific energy of 2.8 W h kg −1 . The maximum specific energy was reached at a current density of 6.25 mA cm −2 , with a value of 10.79 W h kg −1 for the EC at 60 °C. These results offer some insight into how the morphology and composition of thin films can be tuned by the electrochemical synthesis temperature, yielding different electrochemical performances and areal capacity behaviors.

Keywords: electrochemical synthesis; cobalt hydroxide; morphology control; electrochemical performance; energy storage devices (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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