Presentation: 2024 ND EPSCoR Annual conference
November 21, 2024, Alerus Center, Grand Forks, North Dakota
The Next Generation of Energy Storage Devices - Supercapacitors
Wen
Sun
Doctoral Student
University of North Dakota
Co-authors: Xin Zhang, Doctoral student, Chemical Engineering, UND; Mehmet Ozdogan, Postdoc, Physics & Astrophysics, UND; Xiaodong Hou, Research Associate Professor, CEM Research Institute, UND; Nuri Oncel, Professor, Physics & Astrophysics, UND; Julia Xiaojun Zhao, professor, Department of Chemistry, UND
Session
Poster Session A
Poster #74
This work is the first time a binder-free nanonetwork was synthesized using humic acid from coal as the precursor and nickel foam as the substrate. The hydrothermal method and calcination process have been used to prepare coal-derived humic acid at nickel foam (CHA@Ni-foam) and this material has been used as electrode material for electrical double-layer capacitors. Various characterization techniques, including scanning electron microscopy, energy-dispersive X-ray spectroscopy, cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy, were employed to analyze the microstructure, composition, and electrochemical properties of CHA@Ni-foam. This binder-free CHA@Ni-foam exhibited an excellent specific capacitance of 905.3 F/g in 2M KOH electrolyte which is 3 times higher than that of ever reported. Furthermore, the symmetric supercapacitor device constructed from this material exhibited a high energy density of 75.0 W·h/kg and a power density of 150.2 W/kg within a potential range of 1.6 V and the capacitance retention are 106.8% after 2000 cycles of GCD. This first-time synthesized binder-free NC-rGO@Ni-foam from coal-based humic acid has the potential as an advanced EDLC electrode material for scalable energy storage devices.