Systematic synthesis of ZIF-67 derived Co3O4 and N-doped carbon composite for supercapacitors via successive oxidation and carbonization

Chen, Tzu-Yang; Lin, Lu‐Yin; Geng, Dongsheng; Lee, Pin‐Yan

doi:10.1016/j.electacta.2021.137986

Cited by 78 publications

(12 citation statements)

References 43 publications

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“…The EIS measurement was carried out with frequency ranges from 0.01 Hz to 100 kHz. The C F value can be calculated using CV curves and eq , where ∫ I d V is the integrated area of the CV curve, v is the scan rate, and Δ V is the potential window for measuring CV curves. , Also, the C F value was evaluated via GC/D curves and eq , where I is the current density, Δ V is the potential window for measuring the GC/D curve, and t is the discharge time in the GC/D curve. , In addition, the energy density ( E ) and power density ( P ) were calculated using eqs and , where Δ V is the potential window and t is the discharge duration in the GC/D curve. , …”

Section: Methodsmentioning

confidence: 99%

Ligand Incorporating Sequence-dependent ZIF67 Derivatives as Active Material of Supercapacitor: Competition between Ammonia Fluoride and 2-Methylimidazole

Lee

et al. 2022

ACS Appl. Mater. Interfaces

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The zeolitic imidazolate framework 67 (ZIF67) derivative is a potential active material of supercapacitors (SC), owing to high specific surface area and porosity and possible formation of cobalt compounds. A novel ZIF67 derivative is synthesized using a one-step solution process with cobalt precursor 2-methylimidazole (2-Melm) and ammonia fluoride in our previous work. Due to its facile synthesis and excellent electrocapacitive behavior, it is crucial to understand the competition between ammonia fluoride and 2-Melm on forming derivatives with cobalt ions and to create more efficient ZIF67 derivatives for charge storage. In this work, several ZIF67 derivatives are designed using a one-step solution process with 2-Melm and ammonia fluoride incorporated in different sequences. The reaction durations for a single ligand and two ligands are controlled. The largest capacity of 176.33 mAh/g corresponding to the specific capacitance of 1057.99 F/g is achieved for the ZIF67 derivative electrode prepared by reacting ammonia fluoride and a cobalt precursor for 0.5 h and then incorporating 2-Melm for another 23.5 h of reaction (NM0.5). This derivative composed of highly conductive CoF 2 , NiF 2 , Co(OH)F, and Ni(OH)F presents high specific surface area and porosity. The relevant SC presents a maximum energy density of 19.5 Wh/kg at 430 W/kg, a capacity retention of 92%, and Coulombic efficiency of 96% in 10000 cycles.

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Section: Methodsmentioning

confidence: 99%

Ligand Incorporating Sequence-dependent ZIF67 Derivatives as Active Material of Supercapacitor: Competition between Ammonia Fluoride and 2-Methylimidazole

Lee

et al. 2022

ACS Appl. Mater. Interfaces

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“…The ZIF67 powder was synthesized according to our previous work. 42 The illustration of the fabricating process for the ZIF67@PAN electrode using in situ and ex situ methods is shown in Scheme 1 for better expression. 2.4.…”

Section: Methodsmentioning

confidence: 99%

“…Other experimental parameters are the same as those used for carrying out the in situ synthesis. The ZIF67 powder was synthesized according to our previous work . The illustration of the fabricating process for the ZIF67@PAN electrode using in situ and ex situ methods is shown in Scheme for better expression.…”

Section: Methodsmentioning

confidence: 99%

Novel In Situ Synthesis of Freestanding Carbonized ZIF67/Polymer Nanofiber Electrodes for Supercapacitors via Electrospinning and Pyrolysis Techniques

Yang

Hsiao

Lin

2021

ACS Appl. Mater. Interfaces

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Zeolitic imidazolate framework-67 (ZIF67) has been regarded as an effective energy storage material due to its high surface area and electroactive cobalt center. Carbonizing ZIF67 can enhance electrical conductivity by converting 2-methylimidazole (2-melm) to carbon with cobalt doping. In this work, a novel in situ electrospinning is proposed to fabricate carbonized ZIF67 on carbon fiber (C67@PAN-OC) as a freestanding supercapacitor electrode. Polyacrylonitrile solution containing a cobalt precursor is used for electrospinning, and produced fibers are immersed in 2-melm to form ZIF67. Individually grown carbonized ZIF67 on carbon fiber is obtained using the in situ electrospinning method, while the one-body mixed carbon electrode is formed using the ex situ electrospinning method. A highest specific capacitance (C F) of 386.3 F/g at 20 mV/s is obtained for the in situ synthesized C67@PAN-OC electrode due to the largest electrochemical surface area and the smallest resistance, while the ex situ synthesized electrode only shows a C F value of 27.7 F/g. A symmetric supercapacitor (SSC) assembled using the optimized C67@PAN-OC electrodes and gel electrolytes shows a maximum energy density of 9.64 kWh/kg at 0.55 kW/kg and a C F retention of 59.5% after 1000 times charge/discharge process. A C F retention of 75.6% after bending 100 times is also obtained for SSC.

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“…Compared with conventional carbon-based electric double layer capacitors, the specific capacities of the transition metal oxide and hydroxide are much higher. , The theoretical capacities of Co 3 O 4 electrode materials can reach 1602 C/g . Chen et al first synthesized a particle-assembled polyhedron structure composed of Co 3 O 4 and N-doped graphite using single ZIF-67 without incorporating other MOF materials as electroactive materials for SCs. Xiao et al constructed a Co-based metal–organic framework to obtain ultrathin layered hexagonal Co 3 O 4 nanosheets, which achieved high electrochemical characterization and green synthesis of electrode materials for supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Upgrading a Supercapacitor by Particalizing Each Ultrathin Nanosheet into a Grain-Bearing Jigsaw-Like Layer

Liu

Huang

2022

Energy Fuels

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Transition metal compounds are usually adopted as electrode materials for supercapacitors. The obtained amorphous Co(CO3)0.5(OH)·0.11H2O (CoCH) electrode nanosheet before calcination can achieve a specific capacity of 691.6 C/g, at a current density of 1 A/g, as well as an excellent rate performance 30.88% from 1 to 20 A/g. Particalization of electrode CoCH nanosheets into crystal nanograins can boost the supercapacity from 691.6 to 1308 C/g remarkably. Furthermore, if obtained CoCH grains can be transferred to a new phase with higher capacity, the performance should be enhanced even better, in theory. However, with CoCH transforming into Co3O4 nanoparticles gradually, the supercapacity rises first and falls after reaching a peak point, which might be arising from the magnetic proximity effect (MPE) of Co3O4 nanoparticles. The supercapacitor performance should be weakened by the Co3O4 crystal grain increment in density, so that an optimal property can be achieved near the peak point, for example, a power density of 967 W kg–1 at an energy density of 35.3 Wh kg–1 and 8.62 W kg–1 at 16251.3 Wh kg–1. The result indicates that MPE should exhibit an important influence on energy storage if the grain layout can be adjusted into a suitable magnetic response configuration.

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Systematic synthesis of ZIF-67 derived Co3O4 and N-doped carbon composite for supercapacitors via successive oxidation and carbonization

Cited by 78 publications

References 43 publications

Ligand Incorporating Sequence-dependent ZIF67 Derivatives as Active Material of Supercapacitor: Competition between Ammonia Fluoride and 2-Methylimidazole

Ligand Incorporating Sequence-dependent ZIF67 Derivatives as Active Material of Supercapacitor: Competition between Ammonia Fluoride and 2-Methylimidazole

Novel In Situ Synthesis of Freestanding Carbonized ZIF67/Polymer Nanofiber Electrodes for Supercapacitors via Electrospinning and Pyrolysis Techniques

Upgrading a Supercapacitor by Particalizing Each Ultrathin Nanosheet into a Grain-Bearing Jigsaw-Like Layer

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