期刊
ELECTROCHIMICA ACTA
卷 362, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137169
关键词
Nd-Mn2O3; Microspheres; Mesoporous; Oxygen vacancies; Robust micro-nano structures; Hybrid Supercapacitors
资金
- DST-SERB [EMR/2017/001999]
- King Saud University, Riyadh, Saudi Arabia [RSP-2020/6]
Synthesis of high energy density and long durability electrode materials are huge urgency for futuristic hybrid supercapacitors (HSCs). In the present work, self-assembled three-dimensional (3D)-mesoporous regimented pristine and neodymium (Nd) doped alpha-Mn2O3 3D microspheres (MSs) are prepared by simple hydrothermal method. Due to uniform morphology, presence of oxygen vacancies, mesoporous robust structure, and optimum doping (Nd5%-doped Mn2O3 3D 3D-MSs) offers a high specific capacitance of 862.14 F g(-1) (431.07 C g(-1)) at 0.5 A g(-1) with superior cycling retention of 97.30% after 2000 cycles. Additionally, a pouch-type HSC device is fabricated using Nd5%-Mn2O3 3D-MSs as a battery-type positive electrode and activated carbon (AC) as a capacitive-type negative electrode. The fabricated device delivers a maximum energy density of 32.26 Wh kg(-1) at a power density of 800 W kg(-1) with superior cyclic retention and exhibit a little loss of 4.56% after 10,000 cycles. This superior performance is due to robust microstructures that can alleviate swelling and shrinking of active material at cycling test. Two pouch-type HSCs are connected in series to power light-emitting diodes (LEDs) for real-time applicability. Overall, this study demonstrates that rational doping, porous architecture, oxygen vacancies, and robust micro-nano structure greatly assist to achieve high energy density as well as long life HSCs devices. (C) 2020 Elsevier Ltd. All rights reserved.
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