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Polymer matrix-assisted commercial-level mass loading of porous cobalt manganese nitride towards high-performance binder-free electrodes for hybrid supercapacitors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-04 , DOI: 10.1039/d4ta03403a Edugulla Girija Shankar 1 , Ampasala Surya Kiran 1 , Mandar Vasant Paranjape 1 , Jae Su Yu 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-09-04 , DOI: 10.1039/d4ta03403a Edugulla Girija Shankar 1 , Ampasala Surya Kiran 1 , Mandar Vasant Paranjape 1 , Jae Su Yu 1
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Supercapacitors (SCs) have a long lifespan and a fast rate of charging and discharging, making them a viable option for the energy source system of the future. However, the primary obstacle for the commercialization of SCs is the large discrepancy between lab-scale research and commercial-scale requirement. In this regard, the present work focuses on the synthesis of a customized high mass-loaded electrode without compromising electrochemical properties, i.e., a binder-free electrode with commercial-level mass-loaded porous cobalt manganese nitride via the assistance of a polyvinylpyrrolidone (PVP) matrix. The various weight percentages of PVP are studied in the growth solution to obtain the porous structure. A mass loading of 16 mg cm−2 is obtained for the optimized PCMN electrode. The electrode exhibits excellent electrochemical properties with an areal capacitance of 12 764 mF cm−2 at 4 mA cm−2 and a cycling stability of 86% of the initial capacitance and a coulombic efficiency of 89% over 10 000 galvanostatic charge–discharge (GCD) cycles. Next, the electrochemical properties of tellurium-coated bio-carbon derived from radish synthesized via pyrolysis are investigated. A polyvinyl alcohol-potassium hydroxide gel electrolyte-assisted quasi-solid-state hybrid SC (QHSC) device using the above-prepared electrodes is fabricated. The QHSC device demonstrates excellent power and energy densities of 18 mW cm−2 and 0.32 mW h cm−2, respectively, with significant capacitance retention and coulombic efficiency of 89% and 98%, respectively, over 10 000 GCD cycles. The fabricated device is attached to a solar panel-integrated helmet for powering various electronic gadgets in real-life applications.
更新日期：2024-09-05
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