Qi Dong

Hefei National Center for Physical Sciences at Nanoscale

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Liangbing Hu

Shaanxi University of Science and Technology

Dunwei Wang

Boston College

Xizheng Wang

Tianjin University of Traditional Chinese Medicine

Jinlong Gao

University of Maryland, College Park

Yonggang Yao

Huazhong University of Science and Technology

Tangyuan Li

University of Maryland, College Park

Zhennan Huang

Oak Ridge National Laboratory

Alexandra H. Brozena

University of Maryland, College Park

Xiahui Yao

Massachusetts Institute of Technology

Zhiqiang Fan

Zhejiang University

Cooperative Institutions

Chinese Academy of Sciences

114

University of Maryland, College Park

University of Science and Technology of China

Zhejiang University

University of Chinese Academy of Sciences

Boston College

Huazhong University of Science and Technology

Hefei National Center for Physical Sciences at Nanoscale

Harbin Institute of Technology

Jilin University

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Emerging starch composite nanofibrous films for food packaging: Facile construction, hydrophobic property, and antibacterial activity enhancement

International Journal of Biological Macromolecules (2022)

Xiaoqing Liu Lei Chen Qi Dong Zhijin Wang Die Zhang

Electrospinning

Polyvinyl Alcohol

Glutaraldehyde

Modified starch

Thermal Stability

10.1016/j.ijbiomac.2022.09.187

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Citations (37)

Functionalizing Titanium Disilicide Nanonets with Cobalt Oxide and Palladium for Stable Li Oxygen Battery Operations

ACS Applied Materials & Interfaces (2015)

Xiahui Yao Qingmei Cheng Jin Xie Qi Dong Dunwei Wang

Li oxygen (Li-O2) batteries promise high energy densities but suffer from challenges such as poor cycling lifetime and low round-trip efficiencies. Recently, the instability of carbon cathode support has been recognized to contribute significantly to the problems faced by Li-O2 batteries. One strategy to address the challenge is to replace carbon materials with carbon-free ones. Here, we present titanium silicide nanonets (TiSi2) as such a new material platform for this purpose. Because TiSi2 exhibits no oxygen reduction reaction (ORR) or oxygen evolution reaction (OER) activities, catalysts are required to promote discharge and recharge reactions at reduced overpotentials. Pd nanoparticles grown by atomic layer deposition (ALD) were observed to provide the bifunctionalities of ORR and OER. Their adhesion to TiSi2 nanonets, however, was found to be poor, leading to drastic performance decay due to Pd detachments and aggregation. The problem was solved by adding another layer of Co3O4, also prepared by ALD. Together, the Pd/Co3O4/TiSi2 combination affords the desired functionalities and stability. Li-O2 test cells that lasted more than 126 cycles were achieved. The reversible formation and decomposition of Li2O2 was verified by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), ferrocenium back-titration, and gas-chromatography and mass spectrometry (GC-MS). Our results provide a new material platform for detailed studies of Li-O2 operations for better understanding of the chemistries involved, which is expected to help pave the way toward practical Li-O2 battery realizations.

Carbon fibers

Oxygen evolution

10.1021/acsami.5b06592

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Monodispersed flower-like MXene@VO₂ clusters for aqueous zinc ion batteries with superior rate performance

Nanoscale (2022)

Zhibin Xu Xilong Li Y. Jin Qi Dong Jiajia Ye

Monoclinic B phase VO2 with a distinctive tunnel structure is regarded as a viable cathode material for use in aqueous zinc ion batteries (AZIBs). However, the low electron conductivity and poor rate performance prevent it from being used further. Herein, we report 3D flower-like MXene nanosheets loaded with the VO2 cluster (MXene@VO2) synthesized via a one-step hydrothermal process, where MXene nanosheets were spontaneously stacked as a skeleton for the growth of VO2 nanobelts. The synergistic effect between MXene nanosheets with high electronic conductivity and VO2 nanobelts with a unique tunnel structure benefitted the electron and Zn2+ transport; the 3D hybrid structure with a high specific surface area provided an increased contact area with the electrolyte and a shortened distance of the Zn2+ transfer path. As a result, this material exhibits a promising Zn2+ storage behavior with a superior rate capability (363.2 mA h g-1 at 0.2C and 169.1 mA h g-1 at 50C) and outstanding long-cycling performance (206.6 mA h g-1 and 76% capacity retention over 5000 cycles at 20C). In addition, a self-charging battery could be prepared by using oxygen in air to oxidize vanadium oxide with lower valence states. Our prepared MXene@VO2 composite with a synergistic effect has been proved to be a promising cathode for AZIBs, offering a progressive paradigm for the development of AZIBs.

10.1039/d2nr03012h

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Citations (16)

End-On Bound Iridium Dinuclear Heterogeneous Catalysts on WO₃ for Solar Water Oxidation

ACS Central Science (2018)

Yanyan Zhao Xingxu Yan Ke Yang Sufeng Cao Qi Dong

Heterogeneous catalysts with atomically defined active centers hold great promise for high-performance applications. Among them, catalysts featuring active moieties with more than one metal atom are important for chemical reactions that require synergistic effects but are rarer than single atom catalysts (SACs). The difficulty in synthesizing such catalysts has been a key challenge. Recent progress in preparing dinuclear heterogeneous catalysts (DHCs) from homogeneous molecular precursors has provided an effective route to address this challenge. Nevertheless, only side-on bound DHCs, where both metal atoms are affixed to the supporting substrate, have been reported. The competing end-on binding mode, where only one metal atom is attached to the substrate and the other metal atom is dangling, has been missing. Here, we report the first observation that end-on binding is indeed possible for Ir DHCs supported on WO3. Unambiguous evidence supporting the binding mode was obtained by in situ diffuse reflectance infrared Fourier transform spectroscopy and high-angle annular dark-field scanning transmission electron microscopy. Density functional theory calculations provide additional support for the binding mode, as well as insights into how end-on bound DHCs may be beneficial for solar water oxidation reactions. The results have important implications for future studies of highly effective heterogeneous catalysts for complex chemical reactions.

10.1021/acscentsci.8b00335

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Citations (71)

Crystallization Behavior of the Blends of Isotactic Polypropylene and Ethylene-Propylene Blocky Copolymers

Polymer-Plastics Technology and Engineering (2009)

Yi‐Liao Liu Junting Xu Qi Dong Zhisheng Fu Zhiqiang Fan

Two ethylene-propylene copolymer fractions (EP90 and EP120) were separated from a polypropylene in-reactor alloy by extraction with n-octane at different temperatures. 13C-NMR shows that these two fractions have a blocky structure and WAXD reveals that both ethylene and propylene sequences in these two fractions are crystallizable. However, EP90 has higher propylene content and the average length of propylene sequences is longer. These two fractions were blended with isotactic polypropylene (PP) at various proportions, respectively, and crystallization behavior and morphology of the blends were investigated. It is found that both EP90 and EP120 are partially compatible with PP. The phase-separated domains have a nucleation effect on crystallization of PP, leading to increase in crystallization temperature and crystallinity of PP in the blends. EP90 and EP120 also affect the relative content of β crystals in an irregular way. The number of EP90-rich domains in PP/EP90 blends is larger than that of EP120-rich domains in PP/EP120 blends, but the size of EP90-rich domains is smaller, indicating that EP90 has better compatibility with PP than EP120. Spherulites are formed in all the blends. The data were analyzed with Hoffman-Lauritzen theory of crystallization regime and the free energy of the folding surface (σe) was derived. Addition of EP90 and EP120 has little effect on the transition temperature from regime II to regime III. The value of σe for the PP/EP90 blends is similar to that of neat PP, but σe of the PP/EP120 blends is a little higher than that of neat PP.

Tacticity

Polypropylene

Morphology

10.1080/03602550802675975

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Citations (9)

Research on the Durability of Reinforced Chemically Bonded Ceramics-Based Concrete Structural Members in Marine Environment

Advanced materials research (2014)

Zhong Xin Li Qi Dong Zhuo Wei

In order to study the durability of reinforced chemically bonded ceramics-based concrete structural members in marine environment, both the experiment of chloride ion permeability-resistance and rapid corrosion experiment of rebar in the CBC concrete were conducted. The methods of ASTM C1202,RCM and NEL were used to comprehensively assess the ability of chloride ion permeability-resistance of CBC concrete, electric flux and unsteady migration coefficients were taken as estimate indexes, while in the rapid corrosion experiment of rebar under the condition of immersing-drying circulating, rusty accumulation rate and weight loss ratio were taken as estimate indexes. The results of experiments indicate that CBC concrete has strong resistibility for chloride ion penetration, however, it cannot protect the internal rebar effectively, for the reason that the rebar in this test has been seriously corroded.

Rebar

Electric flux

10.4028/www.scientific.net/amr.1044-1045.189

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Citations (0)

Study on tribological behaviour of plasma-treated PEEK and its composites

Wear (1995)

Renji Zhang Anastasia Hager K. Friedrich Qi Song Qi Dong

10.1016/0043-1648(95)90177-9

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Citations (35)

Organic Molecular Intercalated V₃O₇·H₂O with High Operating Voltage for Long Cycle Life Aqueous Zn‐Ion Batteries

Advanced Functional Materials (2023)

Mingying Zhang Xueqian Zhang Qi Dong Shaojie Zhang Zhibin Xu

Abstract V 3 O 7 ·H 2 O (VO) is an attractive cathode material for high‐capacity aqueous Zn‐ion batteries (AZIBs), but it is limited by slow ion mobility and low working platform voltage. Here, a 1,3‐propane diamine (DP)‐intercalated VO with nanoribbon‐assembled thorn flower‐like structure is fabricated by a facile hydrothermal method, noted as VO‐DP. The study shows that the zinc ion diffusion coefficient in VO‐DP (3.1 × 10 −8 cm −2 s −1 ) is five orders of magnitude higher than that of a pure VO counterpart. Auxiliary density functional theory simulation shows that the embedded energy of zinc ions in VO‐DP significantly decreases from 0.24 to −2.5 eV, thus leading to excellent diffusion kinetics and superior rate performance. Benefiting from these unique properties, AZIBs composed of VO‐DP cathodes exhibit high operating voltage (0.89 V), remarkable capacities of 473 mA h g −1 at 0.05 A g −1 , excellent rate capability (144 mA h g −1 at 10 A g −1 ) and long‐term cycling performance (73% capacity retention over 15 000 cycles at 10 A g −1 ).

Propane

10.1002/adfm.202213187

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Citations (40)

Enabling rechargeable non-aqueous Mg–O₂ battery operations with dual redox mediators

Chemical Communications (2016)

Qi Dong Xiahui Yao Jingru Luo Xizi Zhang Ha-Jin Hwang

The problems of low discharge voltage and poor rechargeability for Mg–O₂ batteries can be addressed by using two redox mediators.

Dual role

10.1039/c6cc07818d

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Citations (30)