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RISS 인기검색어
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- 저자 : Peizhi Yang (검색결과 3 건)
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Wen Yang,Bin Xia,Jiacheng Lu,Peizhi Yang,Xiaobo Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
"Novel hierarchical porous NiMoS4 microspheres with high electrochemical performance was successfully prepared using a facile one-step hydrothermal method. The dual application of porous NiMoS4 microspheres in energy harvesting and storage (i.e., dye-sensitized solar cells (DSSCs) and supercapacitors (SCs), respectively) is explored. In contrast to NiS2 nanosheets, MoS2 nanosheets and Pt counter electrodes (CEs), the NiMoS4 microspheres CE demonstrated the lowest charge transfer resistance and highest electrocatalytic activity for the I3 - /I - redox couple reaction. The NiMoS4-based DSSC showed a higher power conversion efficiency (8.9%) even than that of Pt-based DSSC (8.7%) under simulated standard global AM 1.5G sunlight (100 mW cm -2). As an electroactive material for SCs, the assembled NiMoS4//AC asymmetric supercapacitor showed excellent specific capacitance (118.7 F g -1 at 1 Ag -1), high energy density of 42.2 Wh kg -1 (with a power density of 799.2 W kg -1), and superior cycling durability with a specific capacitance retention of 79.5% after 9000 cycles at 3 A g -1."
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Wang, Xia,Wang, Hong,Li, Qiang,Li, Hongsen,Xu, Jie,Zhao, Guoxia,Li, Hongliang,Guo, Peizhi,Li, Shandong,Sun, Yang-kook The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.13
<P>A promising anode material for lithium-ion batteries (LIBs) consisting of Sb2Se3 nanorods and reduced graphene oxide (rGO) sheets has been prepared by an effective solvothermal approach. The synergetic effect between Sb2Se3 nanorods and rGO matrix provides not only high conductivity paths and strong electron contact interface, but also alleviates the volume change of Sb2Se3 nanorods, resulting in excellent lithium-storage performance. When tested as an anode material for LIBs, a high capacity of 868.30 mAh g(-1) can be retained after 100 cycles at 200 mA g(-1). Even at 2000 mA g(-1), a satisfactory capacity of 430.40 mAh g(-1) after long 550 cycles can be delivered. Ex situ X-ray diffraction study suggests that the Sb2Se3/rGO composite follows the combined Li+ intercalation, conversion reaction and alloying reaction mechanism. These features suggest the Sb2Se3/rGO composite a viable choice for application as an anode material in high-performance LIBs. (C) 2017 The Electrochemical Society. All rights reserved.</P>
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Shuxia Li,Yunru An,Shaya Hailati,Jing Zhang,Yuman Cao,Yushi Liu,Jincai Geng,Tianming Hu,Peizhi Yang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.5
Cytokinin oxidase/dehydrogenase (CKXs) areinvolved in various physiological processes, includingcytokinins (CKs) catabolism, root system architecture andresponse to abiotic stresses in plants. Alfalfa (Medicagosativa) is a widely cultivated forage which is frequentlythreatened by high salinity, and the potential role of CKXs inalleviating the salt stress in alfalfa lacked attention. In thisstudy, we isolated a CKX gene from alfalfa, MsCKX(MK177192), and identified its biological functions byoverexpressing it in Arabidopsis. MsCKX shares high sequenceidentity with CKX from other legume plants, especiallyMedicago truncatula (98%). MsCKX was clearly tissuespecific,and it was mainly expressed in roots. In addition,the expression of MsCKX increased under salt stress andabscisic acid (ABA) treatment. Overexpression of MsCKXgene increased the activity of CKX, which led to an enlargedroot system in transgenic Arabidopsis plants. Overexpressionof MsCKX gene enhanced salt tolerance of transgenic plantsby maintaining a higher K+/Na+ ratio, enhancing the activities ofantioxidant enzymes to scavenge ROS and increasing theexpression levels of stress-related genes (P5CS1, DREB2,ion transporters and H+ pumps). Taken together, these resultsshed light on the roles of MsCKX involved in salt toleranceand may have applications in salt-resistant breeding ofalfalfa.
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