Tuning capacitance of bimetallic ZnCo2O4 using anionic, cationic and non-ionic surfactants by hydrothermal synthesis for high-performance asymmetric supercapacitor
Bojarajan A.K. Gunasekaran S.S. Kalluri S. Al Omari S.A.B. Bakenov Z. Sangaraju S.
November 2024Elsevier B.V.
Inorganic Chemistry Communications
2024#169
Surface properties of nanomaterials are directly related to their electrochemical performance, with surfactants playing an essential role in their cost-effective synthesis as structure-directing agents and templates. This research article discusses the effects of neutral, cationic, and anionic surfactants on the capacitance of bimetallic ZnCo2O4 nanomaterial, synthesized via a straightforward hydrothermal-annealing method. We investigated how cationic (cetyl-trimethyl ammonium bromide), anionic (sodium dodecyl sulphate), and non-ionic (urea) surfactants influence the electrochemical characteristics of ZnCo2O4 nano-powders. All three surfactant-based ZnCo2O4 electrodes exhibited Faradaic behaviour during electrochemical tests. The ionic nature of the surfactants significantly impacted the charge-storage mechanism, with specific capacitance values rising in the order of Urea (550 Fg−1) < C-TAB (740 Fg−1) < SDS (980 Fg−1) at a 1 Ag−1 in half-cell studies. The ZnCo2O4-SDS displayed the highest surface redox reactivity and superior electrochemical performance, with 426 Fg−1 in full-cell studies, energy density of 230 WhKg−1 (1 Ag−1), power density of 18,213.9 WKg−1 (10 Ag−1), and 93 % capacitance retention is observed over 50,000 cycles (50 Ag−1).
Asymmetric , Bi-metallic , Pseudo-capacitance , Specific capacitance , Surface area , Zinc-cobalt oxide
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Department of Mechanical and Aerospace Engineering, United Arab Emirates University, Al Ain, 15551, United Arab Emirates
National Water and Energy Center, United Arab Emirates University, Al Ain, 15551, United Arab Emirates
Crescent Global Outreach Mission, B.S. Abdur Rahman Crescent Institute of Science and Technology, India
Department of Electronics and Communication Engineering, School of Engineering and Sciences, SRM University-AP, Andhra Pradesh, Amaravati, 522240, India
SRM-Amara Raja Center for Energy Storage Devices, SRM University-AP, Andhra Pradesh, Amaravati, 522240, India
Department of Chemical and Materials Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Mechanical and Aerospace Engineering
National Water and Energy Center
Crescent Global Outreach Mission
Department of Electronics and Communication Engineering
SRM-Amara Raja Center for Energy Storage Devices
Department of Chemical and Materials Engineering
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