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144 results on '"Liu, Huiqiao"'

14. Pseudocapacitance‐Dominated MnNb2O6‐C Nanofiber Anode for Li‐Ion Batteries.

Author

Cao, Kangzhe, Wang, Sitian, Ma, Jiahui, Xing, Xiaobing, Liu, Xiaogang, Jiang, Yong, Fan, Yang, and Liu, Huiqiao

Subjects
LITHIUM-ion batteries, ANODES, INTERCALATION reactions, ELECTROCHEMICAL analysis, CHARGE exchange, ELECTRIC batteries
Abstract

MnNb2O6 anode has attracted much attention owing to its unique properties for holding Li ions. Unluckily, its application as a Li‐ion battery anode is restricted by low capacity because of the inferior electronic conductivity and limited electron transfer. Previous studies suggest that structure and component optimization could improve its reversible capacity. This improvement is always companied by capacity increments, however, the reasons have rarely been identified. Herein, MnNb2O6‐C nanofibers (NFs) with MnNb2O6 nanoparticles (~15 nm) confined in carbon NFs, and the counterpart MnNb2O6 NFs consisting of larger nanoparticles (40–100 nm) are prepared by electrospinning for clarifying this phenomenon. The electrochemical evaluations indicate that the capacity achieved by the MnNb2O6 NF electrode presents an activation process and a degradation in subsequence. Meanwhile, the MnNb2O6‐C NF electrode delivers high reversible capacity and ultra‐stable cycling performance. Further analysis based on electrochemical behaviors and microstructure changes reveals that the partial structure rearrangement should be in charge of the capacity increment, mainly including pseudocapacitance increment. This work suggests that diminishing the dimensions of MnNb2O6 nanoparticles and further confining them in a matrix could increase the pseudocapacitance‐dominated capacity, providing a novel way to improve the reversible capacity of MnNb2O6 and other intercalation reaction anodes. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Boosting glucose oxidation by constructing Cu–Cu2O heterostructures.

Author

Cao, Kangzhe, Zhang, Hang, Gao, Zihui, Liu, Yiyuan, Jia, Yongheng, and Liu, Huiqiao

Subjects
GLUCOSE, OXIDATION of glucose, GLUCOSE analysis, HETEROSTRUCTURES, ELECTROCATALYSTS, P-type semiconductors, ALKALINE solutions, CATALYTIC activity
Abstract

Cuprous oxide (Cu2O) is an important p-type semiconductor and widely used in the electrocatalytic field. However, the limited number of active sites and its poor conductivity make it difficult to further improve its catalytic activity. Here, we adopt a two-step method involving the reduction of Cu2+ at alkaline conditions and low temperature as well as heat treatment to fabricate Cu–Cu2O heterostructures in the presence of PVP. When used as a catalyst for glucose oxidation, Cu–Cu2O heterostructure possesses abundant active sites to react with glucose molecules, and moreover the metallic Cu simultaneously provides a highly conductive path for electrical charge transfer during the electrocatalytic oxidation reaction of glucose. As a result, the Cu–Cu2O heterostructure exhibits enhanced electrocatalytic activity towards glucose oxidation in 0.1 M NaOH solution compared to only Cu2O, and the fabricated non-enzymatic glucose sensor offers a low detection limit of 1.4 μM (S/N = 3), a high sensitivity (1446 μA mM−1 cm−2), and a wide linear range (0.002–4 mM) at a working voltage of 0.55 V (vs. SCE) in alkaline solutions. The as-prepared Cu–Cu2O heterostructure has a high catalytic activity, providing a new strategy for the design of other electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2020
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