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| 1 | K+alkalization promoted Ca2+intercalation in V2CTx MXene for enhanced Li storage显示文摘Although MXenes is highly attractive as anode materials of lithium ion batteries,it sets a bottleneck for higher capacity of the V2CTxMXene due to the limited interlayer space and the derived surface terminations.Herein,the cation intercalation and ion-exchange were well employed to achieve a K+and Ca2+intercalated V2CTxMXene.A larger interlayer distance and low F surface terminations were thereof obtained,which accelerates the ion transport and promotes the delicate surface of V2CTx MXene.As a result,a package of enhanced capacity,rate performance and cyclability can be achieved.Furthermore,the ion exchange approach can be extended to other 2 D layered materials,and both the interlayer control and the surface modification will be achieved. | Ming Lu Yaopeng Zhang Junnan Chen Wenjuan Han Wei Zhang Haibo Li Xia Zhang Bingsen Zhang | 2020 | Journal of Energy Chemistry2020，29，10： | 4 |
| 2 | Cooperative catalytic platinum species accelerating polysulfide redox reactions for Li-S batteries显示文摘The shuttle effect derived from diffusion of lithium polysulfides(LiPSs) and sluggish redox kinetic bring about poor cycling stability and low utilization of sulfur,which have always been the key challenging issues for the commercial application of lithium-sulfur(Li-S) batteries.Rational design of cathode materials to catalyze Li_(2)S dissociation/nucleation processes is an appealing and valid strategy to develop high-energy practical Li-S batteries.Herein,considering the synergistic effect of bidirectional catalysis on LiPSs conversion and enhanced chemical immobilization for LiPSs by heteroatom doping,Pt nanoparticles loaded on nitrogen-doped carbon spheres(Pt/NCS composites) were constructed as cathode materials.According to the dynamic evolution of Pt catalysts and sulfur species,Pt~0 and Pt^(2+) species were identified as active species for the accelerated dissociation and nucleation of Li_(2)S,respectively.Meanwhile,in-situ Raman results demonstrated the expedited conversion of sulfur species resulted from bidirectional catalysis of active Pt species,corresponding to boosted redox kinetics.Consequently,Pt/NCS cathode exhibited improved long-term cyclability with high initial capacity,along with enhanced rate capability.This work provides a facile approach to construct cathode materials with bidirectional catalysis on Li_(2)S dissociation/nucleation,and sheds light on a more global understanding of the catalytic mechanism of metal catalysts during LiPSs conversion. | Yujie Qi Ning Chai Qinhua Gu Junnan Chen Zhaofeng Zhai Ming Lu Yiming Niu Nan Huang Xia Zhang Bingsen Zhang | 2023 | Journal of Energy Chemistry2023，，12： | 0 |
| 3 | Optimizing the electronic structure of Fe-doped Co_(3)O_(4)supported Ru catalyst via metal-support interaction boosting oxygen evolution reaction and hydrogen evolution reaction显示文摘Metal-support interaction(MSI)is an efficient way in heterogeneous catalysis and electrocatalysis to modulate the electronic structure of metal for enhanced catalytic activity.However,there are still great challenges in promoting the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)simultaneously by this way.Herein,Fe-doped Co_(3)O_(4)supported Ru(Ru/FeCo)catalysts are synthesized by MSI strategies to further improve the electrocatalytic activity and stability of the catalysts.The results show that the optimized Ru/FeCo catalyst exhibits the best catalytic performance.The HER and OER tests at10 m A/cm^(2)in 1 mol/L KOH solution show excellent overpotentials of 155 m V and 283 m V,respectively.The activity and stability enhancement can be attributed to the MSI that effectively modify the electronic structure and improve interfacial electron transfer between Ru and Fe-doped Co_(3)O_(4)(FeCo).This work provides an innovative direction for the design of high-efficiency bifunctional electrocatalysts by virtue of the MSI. | Li Gao Xia Zhong Junnan Chen Ying Zhang Jie Liu Bingsen Zhang | 2023 | Chinese Chemical Letters2023，34，9： | 0 |
| 4 | Clinical Study on the Relationship between Fixation of Prosthesis and Health of Surrounding Tissues显示文摘[Objectives] To explore the effect of mouth outside bonding screw fixation and inside bonding fixation in implanting the prosthesis( crown or bridge) on the health of surrounding tissues,to provide a certain reference for the selection of fixation methods for clinically implanting the prosthesis. [Methods]160 cases of patients needing implanting the prosthesis due to dental arch deficiency were selected. They had excellent alveolar bone. They did not smoke,had no diabetes,and their bone tissue healing was at the early stage. They were randomly divided into A and B groups,80 cases in each group. Group A: the mouth inside and abutment of prosthesis was bonded to a single abutment crown or a single abutment bridge; the bonder on the surface of prosthesis was completely removed and then moved into the implant,and fixed with central retaining screw,this group was called ' mouth outside bonding group'. Group B: the abutment was located in the implant and fixed using central retaining screw,then the prosthesis( crown or bridge) was bonded to the abutment,the bonder on the surface of prosthesis was removed,and this group was called mouth ' mouth inside bonding group'. The health condition was compared between two fixing methods for the surrounding tissues of the implant in 24-36 months after restoration. [Results] Group A: the surrounding tissues of the implants for 126 teeth of 80 patients were healthy without occurrence of peripheral inflammation; Group B: in the implants of 112 teeth of 80 patients,7 teeth suffered the peripheral inflammation. Dental implant examination found that there was residue of bonder in the bonding of prosthesis and abutment,3 teeth exfoliated,and 4 teeth were restored after treatment. Through the X2 test,there was significant difference between Group A and Group B( P < 0. 05). [Conclusions] Implant-supported denture often adopts the mouth inside bonding. Since the bonder can not be removed completely,its residue will remain in gingival trough and stimulate the surrounding tissues of the implant and bring about the inflammatory reaction,and even lead to exfoliation of the implant; the mouth inside and abutment of prosthesis was bonded to a single abutment crown or a single abutment bridge,the bonder on the surface of prosthesis was completely removed and then moved into the implant,and fixed with central retaining screw. This method is an effective method for preventing the peripheral inflammation and increasing the success rate of dental implant. | Lei LI Yanzheng SUN Shengteng SUN Xinxin SUI Junnan XIA Yi LI Jianjun YANG | 2017 | Medicinal Plant2017，8，2： | 0 |
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