Determination of Quantum Capacitance of Niobium Nitrides Nb2N and Nb4N3 for Supercapacitor Applications

Journal of Composites Science

Yogesh Kumar¹  Gulzar Ahmed²  Bharti²  Patrizia Bocchetta³  Shatendra Sharma⁴ 

[1] Department of Physics, ARSD College, University of Delhi, New Delhi 110021, India;Department of Physics, Mewar University, Gangrar, Chittorgarh 312901, India;Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via Monteroni, 73100 Lecce, Italy;School of Engineering and USIC, Jawaharlal Nehru University, New Delhi 110067, India;

关键词: niobium nitride;    electrode;    supercapacitors;    quantum capacitance;   

DOI  :  10.3390/jcs5030085

来源: DOAJ

【 摘 要 】

The density of states and quantum capacitance of pure and doped Nb₂N and Nb₄N₃ single-layer and multi-layer bulk structures are investigated using density functional theory calculations. The calculated value of quantum capacitance is quite high for pristine Nb₂N and decent for Nb₄N₃ structures. However for cobalt-doped unpolarized structures, significant increase in quantum capacitance at Fermi level is observed in the case of Nb₄N₃ as compared to minor increase in case of Nb₂N. These results show that pristine and doped Nb₂N and Nb₄N₃ can be preferred over graphene as the electrode material for supercapacitors. The spin and temperature dependences of quantum capacitance for these structures are also investigated.

【 授权许可】

Unknown