Belt-like MnO2 cathode to enable high energy density and ultra-stable aqueous asymmetric supercapacitor

Li, Jie; Yin, Minshuai; Guo, Chunli; Zhang, Huaiping; Li, Taotao; Wang, Nana; Wei, Yinghui; Hou, Lifeng; Jia, Chuankun

doi:10.1016/j.surfcoat.2018.12.059

Cited by 30 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, considerable progress has been made in hydrothermally synthesizing MnO 2 -based SC electrode materials [ 77 , 78 , 79 ]. For instance, Li et al hydrothermally synthesized belt-like MnO 2 nanomaterials exhibiting high porosities, large specific surface areas, and high conductivities [ 80 ]. Moreover, their method is helpful for engineering defects in the electrode material’s internal structure to increase the number of electroactive sites available for redox reactions and improve the electrode’s electrochemical behavior.…”

Section: Hydrothermal Synthesismentioning

confidence: 99%

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

et al. 2022

View full text Add to dashboard Cite

Supercapacitors (SCs) have attracted attention as an important energy source for various applications owing to their high power outputs and outstanding energy densities. The electrochemical performance of an SC device is predominantly determined by electrode materials, and thus, the selection and synthesis of the materials are crucial. Metal oxides (MOs) and their composites are the most widely used pseudocapacitive SC electrode materials. The basic requirements for fabricating high-performance SC electrodes include synthesizing and/or chemically modifying unique conducting nanostructures, optimizing a heterostructure morphology, and generating large-surface-area electroactive sites, all of which predominantly rely on various techniques used for synthesizing MO materials and fabricating MO- and MO-composite-based SC electrodes. Therefore, an SC’s background and critical aspects, the challenges associated with the predominant synthesis techniques (including hydrothermal and microwave-assisted syntheses and chemical-bath and atomic-layer depositions), and resulting electrode electrochemical performances should be summarized in a convenient, accessible report to accelerate the development of materials for industrial SC applications. Therefore, we reviewed the most pertinent studies on these synthesis techniques to provide insight into the most recent advances in synthesizing MOs and fabricating their composite-based SC electrodes as well as to propose research directions for developing MO-based electrodes for applications to next-generation SCs.

show abstract

Section: Hydrothermal Synthesismentioning

confidence: 99%

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The pore size distribution of the cellulose/GO 3.5 /PANI sample presented a wide distribution of pores from micro to meso ranges, with the average pore size of 22.5 nm, which is the highest one among the tested samples. It is believed that the adequate pore size and large total pore volume of cellulose/GO 3.5 /PANI composites would be beneficial to electrochemical performances, because they provide fast ion transportation pathways through the nanopores of electrode materials during the electrochemical tests [55].…”

Section: The Digital Image Inmentioning

confidence: 99%

Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High-Performance Flexible All-Solid-State Supercapacitors

Xia

Gong

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

The cellulose/graphene oxide (GO) networks as the scaffold of free-standing aerogel electrodes are developed by using lithium bromide aqueous solution, as the solvent, to ensure the complete dissolution of cotton linter pulp and well dispersion/reduction of GO nanosheets. Polyaniline (PANI) nanoclusters are then coated onto cellulose/GO networks via in-situ polymerization of aniline monomers. By optimized weight ratio of GO and PANI, the ternary cellulose/GO3.5/PANI aerogel film exhibits well-defined three-dimensional porous structures and high conductivity of 1.15 S/cm, which contributes to its high areal specific capacitance of 1218 mF/cm2 at the current density of 1.0 mA/cm2. Utilizing this cellulose/GO3.5/PANI aerogel film as electrodes in a symmetric configuration supercapacitor can result in an outstanding energy density as high as 258.2 µWh/cm2 at a power density of 1201.4 µW/cm2. Moreover, the device can maintain nearly constant capacitance under different bending deformations, suggesting its promising applications in flexible electronics.

show abstract

“…The ASC device delivered a maximum areal capacitance of 373 mF cm –2 and a specific capacitance of 89.6 F g –1 at a scan rate of 5 mV s –1 and retained almost 98.5% capacitance even after 5000 electrochemical cycles. The high voltage and specific capacitance offered by the NaMnO 2 //MoO 2 ASC led to the delivery of a high gravimetric energy density of 78 Wh kg –1 at a power density of 565 W kg –1 , which is higher than the ASCs developed with LiMnO 2 //MoO 2 , KMnO 2 //MoO 2 and other reported aqueous-based ASC devices. − …”

mentioning

confidence: 95%

High Voltage Asymmetric Supercapacitors Developed by Engineering Electrode Work Functions

2021

View full text Add to dashboard Cite

Currently, a major constraint in employing supercapacitors as a solitary energy storage device in applications like electric vehicles is their low energy density. In aqueous asymmetric supercapacitors, the energy density is limited by the voltage window, which is governed by the electrode’s work functions. Here, the preinsertion of different metal cations such as Li+, Na+, and K+ ions into manganese dioxide (MnO2) to tune the electrode’s work function is demonstrated. Sodium-doped MnO2 (NaMnO2) exhibited a lower work function than Li+ and K+ preinserted electrodes. This lowering of the work function leads to a higher voltage window. The work function tuned NaMnO2 is coupled with a high-work-function negative electrode material, molybdenum oxide (MoO2), to fabricate a 2.5 V aqueous asymmetric supercapacitor. The supercapacitor delivered a maximum energy density of 78 Wh kg–1, a power density of 4.6 kW kg–1, and capacitance retention of 98.6% after 5000 cycles. This work brings new insights into the engineering of electrode’s work function for developing high-voltage and high-energy supercapacitors.

show abstract

Belt-like MnO2 cathode to enable high energy density and ultra-stable aqueous asymmetric supercapacitor

Cited by 30 publications

References 31 publications

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High-Performance Flexible All-Solid-State Supercapacitors

High Voltage Asymmetric Supercapacitors Developed by Engineering Electrode Work Functions

Contact Info

Product

Resources

About