Qing Xia
University of Science and Technology Beijing
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Featured researches published by Qing Xia.
ACS Nano | 2016
Yongqiang Teng; Hailei Zhao; Zijia Zhang; Zhaolin Li; Qing Xia; Yang Zhang; Lina Zhao; Xuefei Du; Zhihong Du; Pengpeng Lv; Konrad Świerczek
A designed nanostructure with MoS2 nanosheets (NSs) perpendicularly grown on graphene sheets (MoS2/G) is achieved by a facile and scalable hydrothermal method, which involves adsorption of Mo7O24(6-) on a graphene oxide (GO) surface, due to the electrostatic attraction, followed by in situ growth of MoS2. These results give an explicit proof that the presence of oxygen-containing groups and pH of the solution are crucial factors enabling formation of a lamellar structure with MoS2 NSs uniformly decorated on graphene sheets. The direct coupling of edge Mo of MoS2 with the oxygen from functional groups on GO (C-O-Mo bond) is proposed. The interfacial interaction of the C-O-Mo bonds can enhance electron transport rate and structural stability of the MoS2/G electrode, which is beneficial for the improvement of rate performance and long cycle life. The graphene sheets improve the electrical conductivity of the composite and, at the same time, act not only as a substrate to disperse active MoS2 NSs homogeneously but also as a buffer to accommodate the volume changes during cycling. As an anode material for lithium-ion batteries, the manufactured MoS2/G electrode manifests a stable cycling performance (1077 mAh g(-1) at 100 mA g(-1) after 150 cycles), excellent rate capability, and a long cycle life (907 mAh g(-1) at 1000 mA g(-1) after 400 cycles).
ACS Nano | 2016
Zhihong Du; Hailei Zhao; Sha Yi; Qing Xia; Yue Gong; Yang Zhang; Xing Cheng; Yan Li; Lin Gu; Konrad Świerczek
A metallic nanoparticle-decorated ceramic anode was prepared by in situ reduction of the perovskite Sr2FeMo0.65Ni0.35O6-δ (SFMNi) in H2 at 850 °C. The reduction converts the pure perovksite phase into mixed phases containing the Ruddlesden-Popper structure Sr3FeMoO7-δ, perovskite Sr(FeMo)O3-δ, and the FeNi3 bimetallic alloy nanoparticle catalyst. The electrochemical performance of the SFMNi ceramic anode is greatly enhanced by the in situ exsolved Fe-Ni alloy nanoparticle catalysts that are homogeneously distributed on the ceramic backbone surface. The maximum power densities of the La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte supported a single cell with SFMNi as the anode reached 590, 793, and 960 mW cm(-2) in wet H2 at 750, 800, and 850 °C, respectively. The Sr2FeMo0.65Ni0.35O6-δ anode also shows excellent structural stability and good coking resistance in wet CH4. The prepared SFMNi material is a promising high-performance anode for solid oxide fuel cells.
Journal of Materials Chemistry | 2016
Qing Xia; Hailei Zhao; Zhihong Du; Zijia Zhang; Shanming Li; Chunhui Gao; Konrad Świerczek
Molybdenum dioxide is an attractive material for anodes of lithium ion batteries due to its high theoretical capacity, more than twice that of graphite. However, slow electrode reaction kinetics and structural degradation caused by large volume changes and phase separation during cycling hinder its practical application. To solve these problems, we design and fabricate a novel, 3-D hierarchical MoO2/Ni/C architecture by a combination of a hydrothermal method with chemical vapor deposition. The nickel nanoparticles are in situ formed and disperse uniformly with flower-like MoO2 particles, which are coated by thin carbon layers. The Ni particles act as a catalyst during the carbon coating process to promote the in situ growth of graphene in the carbon layer. Together, MoO2 and nickel nanoparticles, as well as amorphous carbon and graphene sheets build a 3-D hierarchical robust MoO2/Ni/C structure with a good electronically conductive network and lots of void space. Such a 3-D hierarchical structure combines multiple advantageous features, including an enhanced 3-D electronically conductive network, plenty of tunnels for electrolyte solution penetration, void space for volume change accommodation, and more surface areas for the electrode reaction. The manufactured MoO2/Ni/C composite exhibits a high reversible capacity, and excellent rate capability of 576 and 463 mA h g−1 at current densities of 100 and 1000 mA g−1, respectively. The excellent cycling performance is recorded with a capacity of 445 mA h g−1 maintained at 1000 mA g−1 after 800 cycles. The proposed synthesis process is simple and the design concept can be broadly applied, providing a novel, general approach towards manufacturing of metal oxide/metal/carbon (graphene) composites for high energy density storage or other electrochemical uses.
ACS Applied Materials & Interfaces | 2015
Chunhui Gao; Hailei Zhao; Pengpeng Lv; Tianhou Zhang; Qing Xia; Jie Wang
Si-based electrodes for lithium ion batteries typically exhibit high specific capacity but poor cycling performance. A possible strategy to improve the cycling performance is to design a novel electrode nanostructure. Here we report the design and fabrication of Ni/Si-nanoparticles/graphite clothing hybrid electrodes with a sandwich structure. An efficient dip-coating of Si-NPs combined with carbon deposition was adopted to synthesize the unique architecture, where the Si-NPs are sandwiched between the Ni matrix and the graphite clothing. This material architecture offers many critical features that are desirable for high-performance Si-based electrodes, including efficient ion diffusion, high conductivity, and structure durability, thus ensuring the electrode with outstanding electrochemical performance (reversible capacity of 1800 mA h g(-1) at 2 A g(-1) after 500 cycles). In addition, the hybrid anode does not require any polymeric binder and conductive additives and holds great potential for application in Li-ion batteries.
Journal of Power Sources | 2013
Jie Wang; Hailei Zhao; Qian Yang; Chunmei Wang; Pengpeng Lv; Qing Xia
Journal of Power Sources | 2013
Pengpeng Lv; Hailei Zhao; Jing Wang; Xin Liu; Tianhou Zhang; Qing Xia
Journal of Power Sources | 2014
Zhipeng Zeng; Hailei Zhao; Jie Wang; Pengpeng Lv; Tianhou Zhang; Qing Xia
Journal of Power Sources | 2015
Zhipeng Zeng; Hailei Zhao; Pengpeng Lv; Zijia Zhang; Jie Wang; Qing Xia
Electrochimica Acta | 2015
Qing Xia; Hailei Zhao; Zhihong Du; Zhipeng Zeng; Chunhui Gao; Zijia Zhang; Xuefei Du; Andrzej Kulka; Konrad Świerczek
Journal of Power Sources | 2013
Qing Xia; Hailei Zhao; Zhihong Du; Jie Wang; Tianhou Zhang; Jing Wang; Pengpeng Lv