Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 49, Pages 54524-54536Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13803
Keywords
titanium oxynitride; organic electrolyte; TiON-MnCo2O4; heterostructure; symmetric supercapacitor; coin cell supercapacitor
Funding
- DGIST R&D Program of the Ministry of Science, ICT, and Future Planning of Korea [20-ET-08]
- National Research Foundation (NRF) [2019R1A2C2086770]
- Ministry of Education, Science, and Technology of Korea
- National Research Foundation of Korea [20-ET-08, 5199991614244, 2019R1A2C2086770] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Metal oxynitrides have been considered recently as emerging electrode materials for supercapacitors. Herein, we converted titanate nanotubes into a series of titanium oxynitride (TiON) nanorods at nitridation temperatures of 800, 900, and 1000 degrees C in ammonia gas and tested them as supercapacitor electrodes. TiON-800, TiON-900, and TiON-1000 showed capacities of 60, 140, and 71 F g(-1), respectively, at a current density of 1 A g(-1). However, because of TiON's low capacity, a heterostructure (TiON-900/MnCo2O4) was designed based on the optimized TiON with MnCo2O4(MCO). The heterostructure TiON-900-MCO and MCO electrode materials showed specific capacities of 515 and 381 F g(-1), respectively, at a current density of 1 A g(-1). The cycling stability retention of TiON-900 and MCO were 75 and 68%, respectively; moreover, the heterostructure of TiON-900-MCO reached 78% at a current density of 5 A g(-1) over 5000 cycles. The increased capacity and sustained cycling stability retention are attributable to the synergistic effect of TiON-900 and MCO. A coin cell (CC)-type symmetric supercapacitor prototype of TiON-900-MCO was fabricated and tested in the voltage range of 0.0-2.0 V in 1 M LiClO4 in propylene carbonate/dimethyl carbonate electrolyte, and a 79% cycling retention capacity of TiON-900-MCO-CC was achieved over 10 000 cycles at a current density of 250 mA g(-1). We demonstrated a prototypical single cell of TiON-900-MCO-CC as a sustained energy output by powering a red-light emitting diode that indicated TiON-900-MCo electrode materials' potential application in commercial supercapacitor devices.
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