Capacitive Intermetallic Manganese Nitride with High Volumetric Energy Densities. Issue 13 (1st January 2016)

• Record Type: Journal Article
• Authors: Zhang, Wei-Bin; Ma, Xue-Jing; Kong, Ling-Bin; Luo, Yong-Chun; Kang, Long
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 13(2016)
• Page Start: A2830
• Page End: A2834
• Publication Date: 2016-01-01
• Subjects: Electrochemical capacitance -- Energy density -- Energy storage and conversion -- Intermetallic -- Manganese nitride; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0141614jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A capacitive intermetallic MnN was synthesized via nitridation of MnO2 at 800°C under NH3 atmosphere. A volumetric capacitance of 1044.3 F cm −3 was found in 1 mol dm −3 Na2 SO4 (aq) using a current density of 1 A g −1, and less than 1% of capacitance was lost after 5000 ladder cycles. 89.3% of the initial volumetric capacitance remained at a current density of 10 A g −1 . A reversible electrode process controlled by diffusion and a high electrical conductivity during charging-discharging ensured a long cycle life. The assembled symmetrical capacitor of MnN/ Na2 SO4 (aq)/ MnN shows a high volumetric energy density of 112.2 W h L −1, facilitating heavy-duty applications.