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High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method

Journal Article


Abstract


  • Micro power sources that support higher power capabilities, specific energies, and ultra-long cycling lifetimes are required for next generation microelectro-mechanical systems (MEMS) and miniaturized portable microdevices. We demonstrated a simple, solvent-free method to coat interdigitated gold electrodes with a conformal layer of nanoporous carbon. Initially the electrodes were coated with a film of ZnO via electrodeposition to serve as the zinc source. These films were exposed to 2-methylimidazole vapor to transform the ZnO into a metal organic framework (MOF) called ZIF-8. The thickness of the ZnO film and the duration of the MOF conversion process created ZIF-8 films with different morphologies, cross-sections and elemental compositions. The ZIF-8 films were then carbonized at 800 ��C under a flowing environment of N2 gas to generate nanoporous carbon film electrodes for supercapacitors. The devices have superior capacitance retention, in addition to high power and energy densities. Our 16-electrode microsupercapacitor had a stack power of 232.8 W���cm���3, which could be attained even at a scan rate of 1000 V ���s���1, without rapid stack energy attenuation. The process of combining an inexpensive ZnO electrodeposition method with solvent-free MOF deposition and subsequent carbonization generates high surface area carbon electrodes with good electrochemical performance.

Publication Date


  • 2019

Published In


Citation


  • Li, Y., Xie, H., Li, J., Bando, Y., Yamauchi, Y., & Henzie, J. (2019). High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method. Carbon, 152, 688-696. doi:10.1016/j.carbon.2019.06.050

Scopus Eid


  • 2-s2.0-85067984814

Start Page


  • 688

End Page


  • 696

Volume


  • 152

Issue


Place Of Publication


Abstract


  • Micro power sources that support higher power capabilities, specific energies, and ultra-long cycling lifetimes are required for next generation microelectro-mechanical systems (MEMS) and miniaturized portable microdevices. We demonstrated a simple, solvent-free method to coat interdigitated gold electrodes with a conformal layer of nanoporous carbon. Initially the electrodes were coated with a film of ZnO via electrodeposition to serve as the zinc source. These films were exposed to 2-methylimidazole vapor to transform the ZnO into a metal organic framework (MOF) called ZIF-8. The thickness of the ZnO film and the duration of the MOF conversion process created ZIF-8 films with different morphologies, cross-sections and elemental compositions. The ZIF-8 films were then carbonized at 800 ��C under a flowing environment of N2 gas to generate nanoporous carbon film electrodes for supercapacitors. The devices have superior capacitance retention, in addition to high power and energy densities. Our 16-electrode microsupercapacitor had a stack power of 232.8 W���cm���3, which could be attained even at a scan rate of 1000 V ���s���1, without rapid stack energy attenuation. The process of combining an inexpensive ZnO electrodeposition method with solvent-free MOF deposition and subsequent carbonization generates high surface area carbon electrodes with good electrochemical performance.

Publication Date


  • 2019

Published In


Citation


  • Li, Y., Xie, H., Li, J., Bando, Y., Yamauchi, Y., & Henzie, J. (2019). High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method. Carbon, 152, 688-696. doi:10.1016/j.carbon.2019.06.050

Scopus Eid


  • 2-s2.0-85067984814

Start Page


  • 688

End Page


  • 696

Volume


  • 152

Issue


Place Of Publication