ORCID Profile
0000-0003-3106-9281
Current Organisation
Hong Kong University of Science and Technology
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Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TA10580E
Abstract: Perforated carbon platelets are fabricated as a high-performance positive electrode for vanadium redox flow batteries.
Publisher: American Chemical Society (ACS)
Date: 25-02-2022
Abstract: Electroactive acid anhydride with multicarbonyl is highly promising for electrochemical energy storage because of its high specific capacity and environmental benignity. Its low electrical conductivity and high dissolution in organic electrolyte, however, result in poor cycling and rate capabilities. Here, we report a naphthalene polyimide derivative (NPI) synthesized by using anhydride under condensation polymerization conditions, along with its composite with graphene (NPI-G) fabricated via in situ polymerization. The composite delivers a high reversible capacity and outstanding cycling stability and rate capability as a cathode for sodium-ion batteries (SIBs) owing to the formation of a polymer, the improvement in the electrical conductivity brought about by the highly dispersed graphene sheets, and the enhancement of structural stability resulting from the π-π stacking interaction between the phenyl groups of NPI and the six-member carbon rings of graphene. This investigation sheds light on the development, design, and screening of next-generation organic electrode materials with high performance for SIBs.
Publisher: Wiley
Date: 03-06-2023
Abstract: A Zn anode can offset the low energy density of a flow battery for a balanced approach toward electricity storage. Yet, when targeting inexpensive, long‐duration storage, the battery demands a thick Zn deposit in a porous framework, whose heterogeneity triggers frequent dendrite formation and jeopardizes the stability of the battery. Here, Cu foam is transferred into a hierarchical nanoporous electrode to homogenize the deposition. It begins with alloying the foam with Zn to form Cu 5 Zn 8 , whose depth is controlled to retain the large pores for a hydraulic permeability ≈10 −11 m 2 . Dealloying follows to create nanoscale pores and abundant fine pits below 10 nm, where Zn can nucleate preferentially due to the Gibbs–Thomson effect, as supported by a density functional theory simulation. Morphological evolution monitored by in situ microscopy confirms uniform Zn deposition. The electrode delivers 200 h of stable cycles in a Zn–I 2 flow battery at 60 mAh cm −2 and 60 mA cm −2 , performance that meets practical demands.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA00324D
Abstract: The exceptional kinetics of VO 2 + /VO 2+ on a hierarchical nitrogen-doped carbon electrode are quantitatively deciphered by diffusion-less cyclic voltammetry and theoretical calculations.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA03195G
Abstract: A cosolvent mitigates the rate-limiting step in the oxidation of iodide and boosts the current of an aqueous Zn–I 2 flow battery.
Publisher: American Chemical Society (ACS)
Date: 14-12-2022
No related grants have been discovered for Qing Chen.