ORCID Profile
0000-0002-0538-6729
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Publisher: IOP Publishing
Date: 08-01-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA08693E
Abstract: A poly(4,4′-thiodiphenol)/carbon composite cathode is used to fabricate Zn-ion hybrid energy storage devices with a high capacity and wide voltage window.
Publisher: Elsevier BV
Date: 07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA00710A
Abstract: A comparison study on using small aromatic molecules containing amino or hydroxyl groups, or both, to endow graphene with pseudocapacitance.
Publisher: American Chemical Society (ACS)
Date: 24-07-2019
Publisher: American Chemical Society (ACS)
Date: 27-12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9SE00416E
Abstract: An aqueous asymmetric supercapacitor with a 1.6 V voltage window is fabricated by using two dissimilar polymers.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Wiley
Date: 21-12-2017
Abstract: To date, graphene-based electric double layer supercapacitors have not shown the remarkable specific capacitance as theoretically predicted. An efficient strategy toward boosting the overall capacitance is to endow graphene with pseudocapacitance. Herein, molecules of hydrolyzed polyimide (HPI) are used to functionalize N-doped graphene (NG) via π-π interaction and the resulting enhanced electrochemical energy storage is reported. These aromatic molecules in monolayer form on graphene contribute strong pseudocapacitance. Paper-like NG films with different areal mass loadings ranging from 0.5 to 4.8 mg cm
Publisher: Wiley
Date: 03-2019
Publisher: IOP Publishing
Date: 25-03-2019
Abstract: In-plane asymmetric micro-supercapacitors using nitrogen-doped graphene (NG) film as negative electrode and MnO
Publisher: American Chemical Society (ACS)
Date: 26-06-2017
Abstract: A novel approach to improve the specific capacitance of reduced graphene oxide (rGO) films is reported. We combine the aqueous dispersion of liquid-crystalline GO incorporating salt and urea with a blade-coating technique to make hybrid films. After drying, stacked GO sheets mediated by solidified NaCl and urea are hydrothermally reduced, resulting in a nanoporous film consisting of rumpled N-doped rGO sheets. As a supercapacitor electrode, the film exhibits a high gravimetric specific capacitance of 425 F g
Publisher: Wiley
Date: 13-01-2023
Abstract: Organic cathode materials for aqueous rechargeable Zinc‐ion batteries (ZIBs) include a large variety of aromatic molecules with redox‐activity, and such polymer molecules vary largely in terms of specific capacity, discharge voltage plateau, and cycling stability. Here, three different quinone polymers are prepared by electropolymerizing dihydroxynaphthalene (DHN) isomers of 1,5‐DHN, 1,6‐DHN, and 1,7‐DHN, respectively, and their energy storage performances in aqueous ZIBs are compared. Among the three cathode materials, the poly(1,6‐DHN) cathode shows the best performance in specific capacity and cycling stability. The Zn||poly(1,6‐DHN) cell shows a high areal capacity of 1.4 mAh cm −2 and a high capacity retention of 90 % after 5000 cycles. By combing experiment with computation, the HOMO level of the polymer molecule is found to play a key role behind the specific capacity. Using the poly(1,7‐DHN) cathode that suffers from faster capacity decay in the cycling process, our investigation suggests that residual ions stuck between molecular chains in the insertion/deinsertion process account for the capacity loss. This study provides a further understanding of organic cathode materials for aqueous ZIBs.
Publisher: IOP Publishing
Date: 12-04-2019
Abstract: Plastic film capacitors suffer from low charge storage capacity due to the low dielectric constant of the polymer (<10). We have devised a polyvinylidene fluoride (PVDF) composite film filled with small graphene oxide (GO) sheets that have aromatic molecules attached to their surfaces. The use of 4,4'-oxydiphenol molecules to functionalize graphene sheets is found to have a remarkable effect on enhancing the dielectric permittivity as well as reducing the electrical conductivity of the nanocomposite. When under an electric field, these molecules with an angled molecular geometry act as aligned electric dipoles to largely enhance the dielectric permittivity of the composite, reaching a level two orders of magnitude higher than that of the counterpart filled with blank graphene sheets. Also, the aromatic molecules on the graphene surface act as resistive barriers that block charge transfer between interconnected graphene sheets. As a consequence, the electric conductivity of the composite can be decreased by two orders of magnitude. The PVDF composite filled with functionalized graphene shows a percolation threshold of 13 wt% and a high dielectric constant of 1091 at 100 Hz at this point.
Publisher: American Chemical Society (ACS)
Date: 22-08-2016
Abstract: The formation of liquid crystal (LC) phases in graphene oxide (GO) aqueous solution is utilized to develop high-performance supercapacitors. To investigate the effect of LC formation on the properties of subsequently reduced GO (rGO), we compare films prepared through blade-coating of viscous LC-GO solution and ultrasonic spray-coating of diluted GO aqueous dispersion. After hydrothermal reduction under identical conditions, the films show different morphology, oxygen content, and specific capacitance. Trapped water in the LC GO film plays a role in preventing restacking of sheets and facilitating the removal of oxygenated groups during the reduction process. In device architectures with either liquid or polymer electrolyte, the specific capacitance of the blade-coated film is twice as high as that of the spray-coated one. For a blade-coated film with mass loading of 0.115 mg/cm(2), the specific capacitance reaches 286 F/g in aqueous electrolyte and 263 F/g in gelled electrolyte, respectively. This study suggests a route to pilot-scale production of high-performance graphene supercapacitors through blade-coated LC-GO films.
No related grants have been discovered for Zhao Yi.