Dataset Information

Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO₂ Loading for Supercapacitors.

ABSTRACT: With the fast bloom of flexible electronics and green vehicles, it is vitally important to rationally design and facilely construct customized functional materials with excellent mechanical properties as well as high electrochemical performance. Herein, by utilizing two modern industrial techniques, digital light processing (DLP) and chemical vapor deposition (CVD), a unique 3D hollow graphite foam (HGF) is demonstrated, which shows a periodic porous structure and robust mechanical properties. Finite element analysis (FEA) results confirm that the properly designed gyroidal porous structure provides a uniform stress area and mitigates potential structural failure caused by stress concentrations. A typical HGF can show a high Young's modulus of 3.18?MPa at a low density of 48.2?mg?cm^-3. The porous HGF is further covered by active MnO₂ material with a high mass loading of 28.2?mg?cm^-2 (141?mg?cm^-3), and the MnO₂/HGF electrode still achieves a satisfactory specific capacitance of 260?F?g^-1, corresponding to a high areal capacitance of 7.35?F?cm^-2 and a high volumetric capacitance of 36.75?F?cm^-3. Furthermore, the assembled quasi-solid-state asymmetric supercapacitor also shows remarkable mechanical properties as well as electrochemical performance.

SUBMITTER: Cao Q

PROVIDER: S-EPMC7676245 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO<sub>2</sub> Loading for Supercapacitors.

Cao Qinghe Q Du Junjie J Tang Xiaowan X Xu Xi X Huang Longsheng L Cai Dongming D Long Xu X Wang Xuewen X Ding Jun J Guan Cao C Huang Wei W

Research (Washington, D.C.) 20201110

With the fast bloom of flexible electronics and green vehicles, it is vitally important to rationally design and facilely construct customized functional materials with excellent mechanical properties as well as high electrochemical performance. Herein, by utilizing two modern industrial techniques, digital light processing (DLP) and chemical vapor deposition (CVD), a unique 3D hollow graphite foam (HGF) is demonstrated, which shows a periodic porous structure and robust mechanical properties. F ...[more]

PMID: 33274338

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Project description:Flexible electrochemical supercapacitors (FESCs) are emerging as innovative energy storage systems, characterized by their stable performance, long cycle life, and portability/foldability. Crucial components of FESCs, such as electrodes and efficient electrolytes, have become the focus of extensive research. Herein, we examine deep eutectic solvent (DES)-based polymer gel systems for their cost-effective accessibility, simple synthesis, excellent biocompatibility, and exceptional thermal and electrochemical stability. We used a mixture a DES, LiClO4-2-Oxazolidinone as the electroactive species, and a polymer, either polyvinyl alcohol (PVA) or polyacrylamide (PAAM) as a redox additive/plasticizer. This combination facilitates a unique ion-transport process, enhancing the overall electrochemical performance of the polymer gel electrolyte. We manufactured and used LiClO4-2-Oxazolidinone (LO), polyvinyl alcohol-LiClO4-2-Oxazolidinone (PVA-LO), and polyacrylamide-LiClO4-2-Oxazolidinone (PAAM-LO) electrolytes to synthesize an MnO2 symmetric FESC. To evaluate their performance, we analyzed the MnO2 symmetric FESC using various electrolytes with cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The FESC featuring the PVA-LO electrolyte demonstrated superior electrochemical and mechanical performances. This solid-state MnO2 symmetric FESC exhibited a specific capacitance of 121.6 F/g within a potential window of 2.4 V. Due to the excellent ionic conductivity and the wide electrochemical operating voltage range of the PVA-LO electrolyte, a high energy density of 97.3 Wh/kg at 1200 W/kg, and a long-lasting energy storage system (89.7% capacitance retention after 5000 cycles of GCD at 2 A/g) are feasibly achieved. For practical applications, we employed the MnO2 symmetric FESCs with the PVA-LO electrolyte to power a digital watch and a light-emitting diode, further demonstrating their real-world utility.

Dataset Information

Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO₂ Loading for Supercapacitors.

Publications

Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO<sub>2</sub> Loading for Supercapacitors.

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Dataset Information

Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO2 Loading for Supercapacitors.

Publications

Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO<sub>2</sub> Loading for Supercapacitors.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Structure-Enhanced Mechanically Robust Graphite Foam with Ultrahigh MnO₂ Loading for Supercapacitors.