Synthesis, Characterizations, and Electrochemical Performances of Highly Porous, Anhydrous Co0.5Ni0.5C2O4for Pseudocapacitive Energy Storage Applications

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dc.contributor.author Mishra, Neeraj Kumar
dc.contributor.author Mondal, Rakesh
dc.contributor.author Maiyalagan, Thandavarayan
dc.contributor.author Singh, Preetam
dc.date.accessioned 2023-04-24T09:53:50Z
dc.date.available 2023-04-24T09:53:50Z
dc.date.issued 2022-01-18
dc.identifier.issn 24701343
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/2224
dc.description This paper is submitted by the author of IIT (BHU), Varanasi en_US
dc.description.abstract Electrochemical energy storage relies essentially on the development of innovative electrode materials with enhanced kinetics of ion transport. Pseudocapacitors are excellent candidates to bridge the performance gap between supercapacitors and batteries. Highly porous, anhydrous Ni0.5Co0.5C2O4 is envisaged here as a potential electrode for pseudocapacitor applications, mainly because of its open pore framework structure, which poses inherent structural stability due to the presence of planar oxalate anions (C2O42-), and active participation of Ni2+/3+ and Co2+/3+ results in high intercalative charge storage capacity in the aqueous KOH electrolyte. The Ni0.5Co0.5C2O4 electrode shows specific capacitance equivalent to 2396 F/g at 1 A/g in the potential window of 0.6 V in the aqueous 2 M KOH electrolyte by galvanostatic charge/discharge experiments. Predominant pseudocapacitive mechanism seems to operative behind high charge storage due to active participation of Ni2+/3+ and Co2+/3+ redox couple as intercalative (inner) and surface (outer) charges stored by porous anhydrous Co0.5Ni0.5C2O4 were close to high 38 and 62% respectively. Further, in full cell asymmetric supercapacitors (ASCs) in which porous anhydrous Co0.5Ni0.5C2O4 was used as the positive electrode and activated carbon (AC) was utilized as the negative electrode, in the operating potential window 1.6 V, the highest specific energy of 283 W h/kg and specific power of ∼817 W/kg were achieved at 1 A/g current rates. Even at a very high power density of 7981 W/kg, the hybrid supercapacitor still attains an energy density of ∼75 W h/kg with high cyclic stability at a 10 A/g current rate. The detailed electrochemical studies confirm higher cyclic stability and a superior electrochemical energy storage property of porous anhydrous Co0.5Ni0.5C2O4, making it a potential pseudocapacitive electrode for large energy storage applications. en_US
dc.description.sponsorship Authors thank Department of Ceramic Engineering, IIT (BHU), for its facility and support. P.S. thanks Science and Engineering Research Board (SERB), India, for the financial support (project no.: EMR/2016/006840). The authors also thankfully acknowledge the financial support from the Scheme for Promotion of Academic and Research Collaboration (SPARC) of the Ministry of Human Resource Development (MHRD), Government of India, SPARC grant no. SPARC/2018-2019/P1122/SL. en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.relation.ispartofseries ACS Omega;Volume 7, Issue 2, Pages 1975 - 1987
dc.subject Synthesis en_US
dc.subject Characterizations en_US
dc.subject Electrochemical en_US
dc.subject Electrochemical Performances en_US
dc.subject Anhydrous Co0.5Ni0.5C2O4 en_US
dc.subject Pseudocapacitive Energy en_US
dc.subject pseudocapacitor en_US
dc.title Synthesis, Characterizations, and Electrochemical Performances of Highly Porous, Anhydrous Co0.5Ni0.5C2O4for Pseudocapacitive Energy Storage Applications en_US
dc.type Article en_US


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