Efficient pore engineering in carbonized zeolitic imidazolate Framework-8 via chemical and physical methods as active materials for supercapacitors

Hsiao, Yu-Jui; Lin, Lu‐Yin

doi:10.1016/j.jpowsour.2020.229370

Cited by 46 publications

(16 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slope of the fitting line for peak current difference (ΔJ) to the scan rate is proportional to the ECSA of electrodes. 49,50 Figure 5 shows the relation between ΔJ and the scan rate along with the fitting lines for C67@PAN-OC electrodes prepared using different cobalt precursor concentrations and for the PAN-OC electrode. The slopes of 0.11, 0.52, 0.87, 0.46, 0.39, and 0.01 C were, respectively, obtained for PAN-OC, C67 7 @PAN-OC, C67 14 @PAN-OC, C67 21 @PAN-OC, C67 28 @PAN-OC, and C67 14 @PAN-OC (ex situ) electrodes.…”

Section: Resultsmentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…After being carbonized at 900 • C, ZIF−8 on the surface of PAN nanofiber membrane still maintained the rhombic dodecahedron structure, as shown in Figure 2c. However, the profile of the polygonal ZIF−8 particles shrank, which may be attributed to the structural damage of ZIF−8 in view of Zn evaporation at high carbonizing temperature [41]. On the other hand, the morphology of PAN fibers changed very little.…”

Section: Characterization Of Adsorbentsmentioning

confidence: 98%

“…After high temperature calcination, the Zn element in ZIF−8 disappeared, as shown in Figure 3c. Hsiao et al [41] verified that the Zn or ZnO in the ZIF−8 structure can be removed and porous carbon generated after ZIF−8 is calcinated between 800 and 1000 °C. Thus, the result shown in Figure 3c suggests that ZIF−8 on the surface of the PAN nanofiber membrane was carbonized.…”

Section: Characterization Of Adsorbentsmentioning

confidence: 99%

“…Abbsi et al found that the characteristic peaks of ZIF−8 disappeared, and the diffraction peaks of the amorphous graphitized structure were produced when ZIF−8 was heated to about 908 • C, meaning that the Zn element was evaporated, and ZIF−8 was carbonized. Thus, it may be speculated that our ZIF−8@PAN nanofiber membrane was carbonized at 900 • C. The carbonized ZIF−8 has a higher surface area, which is helpful to promote absorption performance [34,35,41]. To further explore the structure of the carbonized ZIF−8@PAN nanofiber membrane, XRD analysis was performed at room temperature and is plotted in Figure 4.…”

Section: Characterization Of Adsorbentsmentioning

confidence: 99%

“…Thus, it may be speculated that our ZIF−8@PAN nanofiber membrane was carbonized at 900 °C. The carbonized ZIF−8 has a higher surface area, which is helpful to promote absorption performance [34,35,41]. FTIR spectra of the ZIF−8@PAN nanofiber membrane before and after carbonization are shown in Figure 5a.…”

Section: Characterization Of Adsorbentsmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of the Carbonized Zif−8@PAN Nanofiber Membrane for Cadmium Ion Adsorption

et al. 2022

View full text Add to dashboard Cite

The zeolitic imidazolate framework (ZIF−8)@polyacrylonitrile (PAN) nanofiber membrane was prepared and carbonized for heavy metal cadmium ion (Cd2+) adsorption in aqueous medium. Zinc oxide (ZnO) was first sputtered onto the surface of the PAN electrospun nanofiber membrane to provide a metal ion source. Then, the ZIF−8@PAN nanofiber membrane was prepared via in situ solvothermal reaction and carbonized in a tube furnace at 900 °C under a N2 atmosphere to enhance adsorption performance. The synthesized ZIF−8 particles with polyhedral structure were uniformly immobilized on the surface of the PAN electrospun nanofiber membrane. After being heated at 900 °C, the polygonal ZIF−8 shrank, and the carbonized ZIF−8@PAN nanofiber membrane was obtained. Compared with the nanofiber membrane without being carbonized, the adsorption capacity of the carbonized ZIF−8@PAN nanofiber membrane reached 102 mg L−1, and its Cd2+ adsorption efficiency could be more than 90% under the adsorption temperature of 35 °C and solution of pH = 7.5 conditions. According to the adsorption thermodynamics analysis, the Cd2+ adsorption process of the carbonized ZIF−8@PAN nanofiber membrane was spontaneous. The whole Cd2+ adsorption process was more suitably described by the pseudo second-order adsorption kinetics model, indicating that there exists a chemical adsorption mechanism besides physical adsorption.

show abstract

An insight Into Surface and Diffusion Characteristics of UiO‐66@ZIF‐8 Core–Shell MOF for Asymmetric Supercapacitors with Unprecedented Energy Density

Mansi,

Shrivastav,

Dubey

et al. 2024

Advanced Sustainable Systems

View full text Add to dashboard Cite

In this study, nanosized zeolitic imidazolate framework‐8 (ZIF‐8) crystal has been produced on the universitetet i oslo‐66 (UiO‐66) metal–organic framework (MOF) to make core–shell structure using a layer‐by‐layer deposition method. In comparison to the pristine UiO‐66 and ZIF‐8, the core–shell MOF exhibits superior performance in terms of specific capacitance. This enhanced performance is attributed to its remarkable ability to facilitate the rapid diffusion of electrolyte ions through nanosized ZIF‐8 and enhance the electron transfer process involving the inner and outer metal ions within the UiO‐66@ZIF‐8 structure. Remarkably, the core–shell structure achieves an impressive specific capacitance of 588.8 F g−1 at a current density of 0.5 A g−1 using 1 m sulfuric acid (H2SO4) aqueous electrolyte. Additionally, the UiO‐66@ZIF‐8 core–shell material is demonstrated as a positive electrode, coupled with activated carbon (AC) derived from waste tissue paper serving as the negative electrode, in the fabrication of an asymmetric supercapacitor (ASC) device. At a power density of 400 W kg−1, this assembled asymmetric device delivers a notably high energy density of 53 Wh kg−1 along with a cyclic stability of 94.8% after 10 000 cycles. This study substantiates the superior performance of the UiO‐66@ZIF‐8 core–shell MOF structure as a highly effective supercapacitor electrode material, surpassing the performance of its pristine MOF counterparts.

show abstract

Efficient pore engineering in carbonized zeolitic imidazolate Framework-8 via chemical and physical methods as active materials for supercapacitors

Cited by 46 publications

References 43 publications

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

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

Preparation of the Carbonized Zif−8@PAN Nanofiber Membrane for Cadmium Ion Adsorption

An insight Into Surface and Diffusion Characteristics of UiO‐66@ZIF‐8 Core–Shell MOF for Asymmetric Supercapacitors with Unprecedented Energy Density

Contact Info

Product

Resources

About