Xianfeng Hao
Yanshan University
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Featured researches published by Xianfeng Hao.
Ionics | 2017
Yuqing Qiao; Peng Jia; Xiaoyu Zhang; Ning Cai; T.D. Shen; Xianfeng Hao; Yongfu Tang; Xianhui Wang; Lingxue Kong; Weimin Gao
AbstractMesoporous Ni(OH)2/Co(OH)2 electrode materials were synthesized via a simple one-pot procedure by combining homogeneous precipitation and stepwise precipitation method. The configuration of the porous Ni(OH)2/Co(OH)2 electrode materials synthesized provides 3D electron transmission channels through a high conductive Co(OH)2 distributed in the peripheral nanolayer of the composites, which is beneficial to rate capability and cycle stability. The Ni(OH)2/Co(OH)2 electrode materials have a specific surface area of 229xa0m2xa0g−1, which is approximately 40% higher than that of Ni(OH)2 (163xa0m2xa0g−1). Their specific capacitance is up to 1202 and 1022xa0Fxa0g−1 at the current densities of 10 and 20xa0Axa0g−1, respectively. Furthermore, the capacitance retention of the electrode materials at the current density of 10xa0Axa0g−1 is 98% after 5000xa0cycles. The synthesis method provides a novel simple route to fabricate heterostructure materials for capacitors with high electrochemical performance.n Graphical abstractᅟ
Journal of Applied Physics | 2017
Yuanhui Xu; Shanshan Liu; Keju Sun; Shengxue Yu; Xianfeng Hao
A comprehensive investigation of the electronic and magnetic properties of KRuO4 has been performed using the first-principles calculations in order to clarify the importance of Coulomb interaction and spin-orbit coupling effect. The results indicate that its ground state is of a G-type Mott-insulating antiferromagnet with nearest-neighbor antiferromagnetic coupling, and the computed magnetic moment of Ru7+ ion is 0.50 μB, in nice agreement with the observed value of 0.57(7) μB. In addition, the electronic structure near the Fermi level is dominated by strong hybridized Ru 4d and O 2p states. In sharply contrast with KOsO4, the significantly weaker spin orbit coupling of Ru 4d electrons has negligible impact on the electronic and magnetic properties of KRuO4, and the orbital contribution to the total moment is minor. On the other hand, the on-site Coulomb repulsion affects the band structure significantly, and is indispensable for appraising the electronic properties, opening the band gap, establishing th...
RSC Advances | 2016
Yuanhui Xu; Xianfeng Hao; Shanshan Liu; Jing Wang; Chunxiang Shi; Faming Gao; Yongshan Liu
We report on a first-principles study of the effect of pressure on the structural, electronic and magnetic properties of the two-legged spin ladder structure Sr3Fe2O5, using density functional theory within the generalized gradient approximation (GGA)+U method. The theoretical results showed that a first order structural transition with the space-group change from Immm to Ammm is found around 33 GPa, which is in fair agreement with the experimental value (30 GPa). Furthermore, a spin state cross from the high spin state (S = 2) to the intermediate spin state (S = 1) has been demonstrated in the four-fold square-planar FeO4 coordination, when further pressure is applied. The spin collapse is accompanied by a magnetic configuration transition (antiferromagnetic to ferromagnetic) and an electronic transition (insulating to metallic). However, the predicted pressure for spin state transition is considerably larger than the experimental value. The reason for this discrepancy originates from the constant Hubbard U value we adopted. Furthermore, the transition mechanism underlined has been uncovered in terms of density of states analysis and the evolution of the lattice parameters under the pressure.
Materials Letters | 2016
Yuqing Qiao; Huaping Wang; Xiaoyu Zhang; Peng Jia; T.D. Shen; Xianfeng Hao; Yongfu Tang; Xianhui Wang; Weimin Gao; Lingxue Kong
Journal of Alloys and Compounds | 2016
Xianfeng Hao; Peng Jia; Yanli Cui; Jing Wang; Faming Gao; Yuqing Qiao
Electrochimica Acta | 2015
Yuqing Qiao; Peng Jia; Xiaoyu Zhang; Jianyi Xi; Xianfeng Hao; Yongfu Tang; Xianhui Wang
Journal of Alloys and Compounds | 2017
Xianfeng Hao; Yuanhui Xu; Qiangqiang Gao; Shanshan Liu; Jing Wang; Faming Gao
Journal of Physics and Chemistry of Solids | 2018
Shanshan Liu; Runxue Wang; Cuihong Wang; Fan Wang; Yuanhui Xu; Keju Sun; Xianfeng Hao
Journal of Alloys and Compounds | 2018
Lihua Gao; Shanshan Liu; Runxue Wang; Faming Gao; Keju Sun; Xianfeng Hao; Yuanhui Xu
Archive | 2017
Jing Wang; Yuanhui Xu; Xianfeng Hao; Nianrui Qu; Keju Sun; Yizhi Zhang; Shanshan Liu