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79 results on '"Liu, Gonggang"'

61. Semi-Embedding Zn-Co 3 O 4 Derived from Hybrid ZIFs into Wood-Derived Carbon for High-Performance Supercapacitors.

Author

Xiong, Wanning, Ouyang, Jie, Wang, Xiaoman, Hua, Ziheng, Zhao, Linlin, Li, Mengyao, Lu, Yuxin, Yin, Wei, Liu, Gonggang, Zhou, Cui, Luo, Yongfeng, and Xu, Binghui

Subjects
SUPERCAPACITORS, TRANSITION metal oxides, ENERGY density, TRANSITION metals, METALLIC oxides, VALENCE fluctuations
Abstract

Transition metal oxides (TMOs) can provide high theoretical capacitance due to the change of multiple valence states of transition metals. However, their intrinsic drawbacks, including poor electrical conductivity, lower energy density, and huge volume expansion, will result in the pulverization of electrode materials and restricted electrochemical kinetics, thus leading to poor rate capability and rapid capacity fading. Composite electrodes based on transition metal oxides and carbon-based materials are considered to be promising candidates for overcoming these limitations. Herein, we reported a preparation method of hybrid ZIFs derived Zn-doped Co3O4/carbon (Zn-Co3O4/C-230) particles semi-embedded in wood-derived carbon skeleton for integrated electrodes. A large specific surface area, excellent conductivity, and electrochemical stability provide a larger electrochemical activity and potential window for the electrode. Prepared Zn-Co3O4@CW-230 electrode (0.6 mm thick) displays ultrahigh area specific capacitances of 7.83 and 6.46 F cm−2 at the current densities of 5 and 30 mA cm−2, respectively. Moreover, a symmetric supercapacitor assembled by two identical Zn-Co3O4@CW-230 electrodes delivers a superior area-specific capacitance of 2.61 F cm−2 at the current densities of 5 mA cm−2 and great energy densities of 0.36 mWh cm−2 (6.0 mWh cm−3) at 2.5 mW cm−2, while maintaining 97.3% of initial capacitance over 10,000 cycles. It notably outperforms those of most carbon-based metal oxides, endowing the Zn-Co3O4@CW-230 with extensive prospects for practical application. [ABSTRACT FROM AUTHOR]

Published
2022
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78. Assembly of Copolymer and Metal−Organic Framework HKUST-1 to Form Cu 2−x S/CNFs Intertwining Network for Efficient Electrocatalytic Hydrogen Evolution.

Author

Bai, Yuanjuan, Li, Yanran, Liu, Gonggang, and Hu, Jinbo

Subjects
METAL-organic frameworks, ALKALINE solutions, HYDROGEN, HYDROGEN evolution reactions
Abstract

The construction of complex intertwined networks that provide fast transport pathways for ions/electrons is very important for electrochemical systems such as water splitting, but a challenge. Herein, a three dimensional (3-D) intertwined network of Cu2−xS/CNFs (x = 0 or 0.04) has been synthesized through the morphology-preserved thermal transformation of the intertwined PEG-b-P4VP/ HKUST-1 hybrid networks. The strong interaction between PEG chains and Cu2+ is the key to the successful assembly of PEG-b-P4VP nanofibers and HKUST-1, which inhibits the HKUST-1 to form individual crystalline particles. The obtained Cu2−xS/CNFs composites possess several merits, such as highly exposed active sites, high-speed electronic transmission pathways, open pore structure, etc. Therefore, the 3-D intertwined hierarchical network of Cu2−xS/CNFs displays an excellent electrocatalytic activity for HER, with a low overpotential (η) of 276 mV to reach current densities of 10 mA cm−2, and a smaller Tafel slope of 59 mV dec−1 in alkaline solution. [ABSTRACT FROM AUTHOR]

Published
2021
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79. Facile in-situ growth of Ag/TiO2 nanoparticles on polydopamine modified bamboo with excellent mildew-proofing.

Author

Liu, Gonggang, Lu, Zhou, Zhu, Xiu, Du, Xiaoqing, Hu, Jinbo, Chang, Shanshan, Li, Xianjun, and Liu, Yuan

Subjects
BAMBOO, SILVER nanoparticles, TITANIUM oxides, PHOTOCATALYSIS, FUNCTIONAL groups
Abstract

Bamboo with the outstanding properties, such as good mechanical strength, fast growth rate and low growth cost, is considered as one of utilitarian structural nature materials. But bamboo is easy to get mildewed resulting in disfiguration and fungi corrosion. In this work, a facile method was developed to improve the mildew-proofing capability of bamboo. Mussel-inspired polydopamine (PDA) with biomimetic adhesion function and highly active functional groups was employed to immobilize highly-dispersed Ag and TiO2 nanoparticles on the surface of bamboo via an in-situ growth method. Integrating the uniform PDA coating, photocatalytic function of TiO2 nanoparticles and bactericidal role of Ag nanoparticles, the mildew-proofing capability of bamboo is enhanced significantly. The results show a non-covalent interaction is more likely to account for the binding mechanism of PDA to bamboo. And the prepared bamboo samples show good photocatalytic performance and have excellent resistance leachability. Meanwhile, the mildew-proofing property of prepared bamboo sample was greatly improved. [ABSTRACT FROM AUTHOR]

Published
2019
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