A 2.0 V capacitive device derived from shape-preserved metal nitride nanorods. (August 2016)

• Record Type: Journal Article
• Authors: Zhu, Changrong; Sun, Yanfeng; Chao, Dongliang; Wang, Xinghui; Yang, Peihua; Zhang, Xiao; Huang, Hui; Zhang, Hua; Fan, Hong Jin
• Is Part Of: Nano energy. Volume 26(2016:Aug.)
• Page Start: 1
• Page End: 6
• Publication Date: 2016-08
• Subjects: Symmetric supercapacitor -- High working voltage -- Metal nitride -- Electrochemical capacitor -- Atomic layer deposition; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.04.056
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A high working voltage and fast charging/discharging capability are important to a supercapacitor device in order to achieve decent energy densities with high power. In this work, we report 2.0 V quasi-solid-state symmetric capacitive device based on Fe2 N-Ti2 N (FTN) core-shell nanorod array electrodes. Through a surface protection by a thin and ultra-stable Ti2 N shell, Fe2 N converted from its oxyhydroxide precursor inhibits the original nanorod structure. Due to advantageous features of these core-shell metal nitride electrodes (e.g., high conductivity, structure stability, direct current path), the symmetric device permits ultrahigh scan rates (up to 50 V s −1 ) and delivers fairly stable capacitance in long-term cycles (~82 F g −1 with ~99% capacitance retention in 20, 000 cycles). As a result, the supercapacitor exhibits an impressive energy density of ~48.5 W h kg −1 at the power of 2700 W kg −1 . These results demonstrate the potentialities of metal nitride nanorods array for high energy density capacitive device. Graphical abstract: Highlights: High voltage (2.0 V) and ultrafast (scan rates up to 50 V/s) capability of symmetric supercapacitor device; capacity retention of nearly 100% upon 20, 000 cycles. Fe2 N nanorods array is realized assisted by ALD TiO2 ; previous Fe2 N are all nanoparticles. The Ti2 N thin shell is both a conductive pathway and stable protection layer to Fe2 N.