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Molecular structure design of planar zwitterionic polymer electrode materials for all-organic symmetric batteries.

ABSTRACT: All-organic symmetric lithium-ion batteries (LIBs) show promising prospects in sustainable energy storage systems, due to their environmental friendliness, structural diversity and low cost. Nevertheless, it remains a great challenge to explore suitable electrode materials and achieve excellent battery performance for all-organic symmetric LIBs. Herein, a squaraine-anthraquinone polymer (PSQ) electrode material was designed through rational molecular engineering. The well-designed extended π-conjugated system, donor-acceptor structure, abundant redox-active sites and rational manipulation of weak inter-/intramolecular interactions endow the PSQ electrode with outstanding electrochemical performance. The capacity of the PSQ cathode can be optimized to 311.5 mA h g^-1 by in situ carbon-template polymerization. Impressively, PSQ-based all-organic symmetric LIBs displayed high reversible capacity (170.8 mA h g^-1 at 50 mA g^-1), excellent rate performance (64.9% capacity retention at 4000 mA g^-1 vs. 50 mA g^-1), ultralong cycle life up to 30 000 cycles at 2000 mA g^-1 and 97% capacity retention after 2500 cycles at 500 mA g^-1, which is one of the best comprehensive battery performances among the all-organic LIBs reported thus far.

SUBMITTER: Wang J

PROVIDER: S-EPMC9555726 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Molecular structure design of planar zwitterionic polymer electrode materials for all-organic symmetric batteries.

Wang Jun J Liu Haichao H Du Chunya C Liu Yu Y Liu Bing B Guan Haoran H Guan Shaowei S Sun Zhenhua Z Yao Hongyan H

Chemical science 20220916 39

All-organic symmetric lithium-ion batteries (LIBs) show promising prospects in sustainable energy storage systems, due to their environmental friendliness, structural diversity and low cost. Nevertheless, it remains a great challenge to explore suitable electrode materials and achieve excellent battery performance for all-organic symmetric LIBs. Herein, a squaraine-anthraquinone polymer (PSQ) electrode material was designed through rational molecular engineering. The well-designed extended π-con ...[more]

PMID: 36320387

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Project description:Nanoparticle aggregation of supported metal catalysts at high temperatures is a serious problem that causes a drop in catalytic performance. This study investigates the protection of metal nanoparticles from sintering by selectively forming nanoscale SiO2 shells on Pd supported on TiO2 by ultraviolet (UV) light irradiation. The proton-coupled reduction reaction increases the local pH around Pd nanoparticles, resulting in hydrolysis of tetraethoxyorthosilicate (TEOS) in only the vicinity of the metal. An apparent quantum efficiency of only 0.6% is obtained for the Pd/TiO2 catalyst in H2 evolution from ethanol-containing water under 370 nm excitation light. Therefore, the pH of raw slurry solution should be precisely controlled to that slightly below the threshold value for the TEOS hydrolysis reaction before the photodeposition. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) clearly show that the particle size of the Pd nanoparticles (∼40 nm) with the SiO2 shell (∼20 nm) was almost unchanged by the high-temperature treatment at 900 °C in air, suggesting that the SiO2 shell prevented thermal aggregation of Pd nanoparticles. The Pd/TiO2 without SiO2 shell decoration exhibited a drop in the number of active sites, which was likely due to aggregation of the Pd catalysts. However, the number of active sites on the Pd@SiO2/TiO2 catalyst was maintained even after the catalyst was calcined at 900 °C. Consequently, the Pd@SiO2/TiO2 catalyst maintained its catalytic performance for simulated exhaust gas purification even after treatment at 900 °C. This study presents a methodology to produce sintering-tolerant supported metal nanoparticles using the photocatalytic gas permeable layer fabrication method. This paper presents a new methodology to produce a sintering-resistant exhaust gas purification catalyst with ultrathin SiO2 decoration on already supported Pd metal nanoparticles using a vacuum-free photocatalytic layer deposition method.

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Molecular structure design of planar zwitterionic polymer electrode materials for all-organic symmetric batteries.

Publications

Molecular structure design of planar zwitterionic polymer electrode materials for all-organic symmetric batteries.

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