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Russell JC, Posey VA, Gray J, May R, Reed DA, Zhang H, Marbella LE, Steigerwald ML, Yang Y, Roy X, Nuckolls C, Peurifoy SR. High-performance organic pseudocapacitors via molecular contortion. NATURE MATERIALS 2021; 20:1136-1141. [PMID: 33795846 DOI: 10.1038/s41563-021-00954-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 02/09/2021] [Indexed: 05/28/2023]
Abstract
Pseudocapacitors harness unique charge-storage mechanisms to enable high-capacity, rapidly cycling devices. Here we describe an organic system composed of perylene diimide and hexaazatrinaphthylene exhibiting a specific capacitance of 689 F g-1 at a rate of 0.5 A g-1, stability over 50,000 cycles, and unprecedented performance at rates as high as 75 A g-1. We incorporate the material into two-electrode devices for a practical demonstration of its potential in next-generation energy-storage systems. We identify the source of this exceptionally high rate charge storage as surface-mediated pseudocapacitance, through a combination of spectroscopic, computational and electrochemical measurements. By underscoring the importance of molecular contortion and complementary electronic attributes in the selection of molecular components, these results provide a general strategy for the creation of organic high-performance energy-storage materials.
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Affiliation(s)
- Jake C Russell
- Department of Chemistry, Columbia University, New York, NY, USA
| | | | - Jesse Gray
- Department of Chemistry, Columbia University, New York, NY, USA
| | - Richard May
- Department of Chemical Engineering, Columbia University, New York, NY, USA
| | - Douglas A Reed
- Department of Chemistry, Columbia University, New York, NY, USA
| | - Hao Zhang
- Department of Chemistry, Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials, Beijing, China
| | - Lauren E Marbella
- Department of Chemical Engineering, Columbia University, New York, NY, USA
| | | | - Yuan Yang
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, NY, USA.
| | - Colin Nuckolls
- Department of Chemistry, Columbia University, New York, NY, USA.
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Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings. Processes (Basel) 2019. [DOI: 10.3390/pr7050316] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Ultrafine powder coatings are one of the development directions in the powder coating industry, as they can achieve thin coatings with good leveling and high surface smoothness comparable to liquid coatings. Compared to regular coatings, they experience a higher sensitivity to any incompatibilities, e.g., filler from coating components. The properties of fillers play a great role in the performance of coating films. Aluminum trihydrate (Al(OH)3) is a well-known filler in solvent-based coatings and other polymer industries. To study and evaluate the performances of Al(OH)3 in ultrafine powder coatings, a popular filler, barium sulfate (BaSO4) is used for comparison. Both fillers are added in ultrafine powder coatings based on two of the most commonly used resin systems (polyester-epoxy and polyester). The differences of physical and chemical properties between both fillers have significant influences on several properties of powder paints and coating films. The polar groups (hydrogen bond) in Al(OH)3 result in the strong interaction between inorganic filler and organic polymer matrix, thus decreasing the molecular network mobility and influencing the chain formation, which is verified by differential scanning calorimetric (DSC). The bed expansion ratio (BERs) of powder paints incorporated with Al(OH)3 are much higher than those with BaSO4, which indicate more uniform gas-solid contact during the spraying process. Samples with Al(OH)3 exhibit much lower specular gloss at 60°, which are expected to achieve remarkable matting effects. Superior corrosion resistances can be observed for almost all the coated panels incorporated with Al(OH)3 in contrast to those with BaSO4. Other aspects are slightly influenced by the difference between the two fillers, such as the angle of repose values (AORs) of powder paints, the impact resistance and flexibility of coating films.
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Guo J, Li Y, Lu H, Li Y, Li X, Qin L, Dong G. PCEC hydrogel used on sustained-release hyaluronic acid delivery with lubrication effect. J Appl Polym Sci 2018. [DOI: 10.1002/app.46228] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Junde Guo
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Yue Li
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Hailin Lu
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Yu Li
- Department of Applied Chemistry; School of Science Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Xing Li
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Liguo Qin
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
| | - Guangneng Dong
- Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering; Xi'an Jiaotong University; Xi'an Shaanxi 710049 China
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Roychowdhury S, Mitra D. Fabrication of Aromatic Polyimide Membrane to Study the Pervaporative Separation of Phenanthrene/n-tetradecane Mixtures (Model Diesel) and Process Optimization Using Response Surface Methodology. CHEM ENG COMMUN 2016. [DOI: 10.1080/00986445.2016.1235563] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Roychowdhury S, Mitra D. Separation of phenanthrene/N-tetradecane mixtures (model diesel) via pervaporation using an aromatic polyimide membrane. POLYM ENG SCI 2016. [DOI: 10.1002/pen.24434] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sayan Roychowdhury
- Department of Chemical Technology; University of Calcutta; Calcutta India
| | - Debarati Mitra
- Department of Chemical Technology; University of Calcutta; Calcutta India
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