Urea-Assisted Nickel-Manganese Phosphate Composite Microarchitectures with Ultralong Lifecycle for Flexible Asymmetric Solid-State Supercapacitors: A Binder-Free Approach
- Authors
- Chun, Seung-Hyun; Katkar, Pranav K.; Patil, Supriya A.; Jeon, Jae Ho; Na, Hong Ryeol; Padalkar, Navnath S.; Jerng, Sahng-Kyoon; Lee, Sunghun
- Issue Date
- 3-Nov-2022
- Publisher
- AMER CHEMICAL SOC
- Citation
- ENERGY & FUELS, v.36, no.21, pp.13356 - 13369
- Journal Title
- ENERGY & FUELS
- Volume
- 36
- Number
- 21
- Start Page
- 13356
- End Page
- 13369
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88421
- DOI
- 10.1021/acs.energyfuels.2c02875
- ISSN
- 0887-0624
- Abstract
- The limited energy density and cyclability of supercapacitors are major roadblocks to their development as energy storage devices. To address these issues, a binder-free nickel-manganese (Ni-Mn) phosphate composite (NMP series) microarchitecture has been synthesized by the hydrothermal method on a nickel foam (NF) substrate using various urea dosages. Due to the influence of urea, microrod-/microplate-like morphologies of NMP series thin films evolved to micropetals. This study demonstrates a synergy between Ni and Mn metal ions and also the influence of different urea contents on the physicochemical properties of mesoporous NMP series thin films. Notably, the NMP-4 microarchitecture has a large surface area (7.5 m2 g-1), which provides more electroactive sites in electrochemical measurements. Accordingly, in the NMP series electrodes, the NMP-4 thin film demonstrated high electrochemical properties (the maximum specific capacity was found to be 901 C/g at a 5 mV/s scan rate) and retained 127% capacity over 6000 cycles, indicating good durability with a well-preserved microstructure throughout the cycling. Furthermore, a flexible asymmetric solid-state (FASS) supercapacitor was designed utilizing NMP-4 and reduced graphene oxide (rGO) as a cathode and an anode, respectively, in the poly(vinyl alcohol)-KOH (PVA-KOH) gel electrolyte with an extended operational voltage of +1.8 V. This FASS device provides a high specific capacity (192 C/g at 0.6 A/g current density), supreme energy density (48.2 Wh kg-1) at a power density of 575 W kg-1, and a desirable longevity of 108% over 5000 cycles. Moreover, the FASS device also demonstrated its practical applicability. The long-term stability suggests that the binder-free urea-assisted Ni-Mn phosphate composite is a good candidate for energy storage devices.
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