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| 1 | Crystalline and amorphous Mn0_(2)cathodes with open framework enable high-performance aqueous zinc-ion batteries显示文摘Currently,δ-Mn0_(2)is one of the popularly studied cathode materials for aqueous zinc-ion batteries(ZIBs)but impeded by the sluggish kinetics of Zn^(2+)and the Mn cathode dissolution.Here,we report our discovery in the study of crystalline/amorphous Mn0_(2)(disordered Mn0_(2)),prepared by a simple redox reaction in the order/disorder engineering.This disordered Mn0_(2)cathode material,having open framework with more active sites and more stable structure,shows improved electrochemical performance in 2 mol L^(-1)ZnSO_(4)/0.1 mol L^(-1)MnS0_(4)aqueous electrolyte.It delivers an ultrahigh discharge specific capacity of 636 mA·h·g^(-1)at 0.1 A·g^(-1)and remains a large discharge capacity of 216 mA·h·g^(-1)even at a high current density of 1 A·g^(-1)after 400 cycles.Hence disordered Mn0_(2)could be a promising cathode material for aqueous ZIBs.The storage mechanism of the disordered Mn0_(2)electrode is also systematically investigated by structural and morphological examinations of ex situ,ultimately proving that the mechanism is the same as that of the δ-Mn0_(2)electrode.This work may pave the way for the possibility of using the order/disorder engineering to introduce novel properties in electrode materials for high-performance aqueous ZIBs. | Chunfu HUANG Cong WU Zilu ZHANG Yunyun XIE Yang LI Caihong YANG Hai WANG | 2021 | Frontiers of Materials Science2021，15，2： | 0 |
| 2 | Amorphous nickel-cobalt bimetal-organic framework nanosheets with crystalline motifs enable efficient oxygen evolution reaction: Ligands hybridization engineering显示文摘Development of high-efficiency and low-cost electrocatalyst for oxygen evolution reaction(OER) is very important for use at alkaline water electrolysis.Metal-organic frameworks(MOF) provide a rich platform for designing multi-functional materials due to their controllable composition and ultra-high surface area.Herein,we report our findings in the development of amorphous nickel-cobalt bimetal-organic framework nanosheets with crystalline motifs via a simple 'ligands hybridization engineering' strategy.These complexes' ligands contain inorganic ligands(H_2 O and NO_3) and organic ones,hexamethylenetetramine(HMT).Further,we investigated a series of mixed-metal with multi-ligands materials as OER catalysts to explore their possible advantages and features.It is found that the Ni doping is an effective approach for optimizing the electronic configuration,changing lattice ordering degree,and thus enhancing activities of HMT-based electrocatalysts.Also,the crystalline-amorphous boundaries of various HMTbased electrocatalyst can be easily controlled by simply changing amounts of Ni-precursor added.As a result,the optimized ultrathin(Co,0.3 Ni)-HMT nanosheets can reach a current density of 10 mA cm^(-2)at low overpotential of 330 mV with a small Tafel slope of 66 mV dec^(-1).Our findings show that the electronic structure changes induced by Ni doping,2 D nanosheet structure,and MOF frameworks with multiligands compositions play critical roles in the enhancement of the kinetically sluggish electrocatalytic OER.The present study emphasizes the importance of ligands and active metals via hybridization for exploring novel efficient electrocatalysts. | Yang Li Zhonggui Gao Huiming Bao Binghui Zhang Cong Wu Chunfu Huang Zilu Zhang Yunyun Xie Hai Wanga | 2021 | Journal of Energy Chemistry2021，30，2： | 0 |
| 3 | Properties of Flare Events on M Stars from LAMOST Spectral Survey Based on Kepler and TESS Light Curves显示文摘A catalog of M stars has been published from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7(LAMOST DR7).We cross-matched the LAMOST M catalog with Kepler,Kepler 2(K2)and Transiting Exoplanet Survey Satellite(TESS)surveys.We obtained the light curves from the Kepler and TESS surveys.We detected 20,047 flare events from 4053 M stars and calculated their durations,amplitudes,and energies.We analyzed the distribution of the flare durations and energies.The distributions of flare duration for Kepler,K2 and TESS peak are at 3–3.5 hr,4–6 hr and 1–1.5 hr,respectively.This may be the result of the different cadences for the three data sets.The highest regions of the flare energies of Kepler,K2 and TESS are 32–32.5,32–32.5 and31–31.5 erg in Log format,respectively.A linear relationship between flare duration and energy emerges from our analysis.The ratio of flare duration to total observational time is approximately 0.2%–0.3%for the Kepler,K2 and TESS surveys.The occurrence rate of a star with a flare event increases from the M0 to M4 subtypes.We also determined the spatial distribution of the flare rate of M stars in the Milky Way.It seems that the flare rate decreases as the vertical height increases.The power index of the flare energies is in the region of 1.53–2.32,which is similar to previous result for solar type star(2.0).Further,we examined the relationship between the flare amplitude and chromospheric intensity.The flare activity increases rapidly with the increase in the HαEW at the lower values(less approximately 2?)and it increases slowly at the higher values. | Gang Meng Li-Yun Zhang Tianhao Su Zilu Yang Xianming LHan Prabhakar Misra Liu Long Qingfeng Pi Zhongzhong Zhu Linyan Jiang | 2023 | Research in Astronomy and Astrophysics2023，23，5： | 0 |
| 4 | Research on the Countermeasures of Smart Tourism Construction in Sanya Under the Background of Free Trade Port Construction显示文摘By analyzing the current situation of smart tourism construction in combination with the actual tourism situation in Sanya,this study aims to find out the problems existing in the current smart tourism construction and understand the various factors affecting the smart tourism construction in Sanya.Then,relevant theories and practical applications were used to study the ways to carry out smart tourism construction with the help of policy,location,and other advantages to meet the needs of the development of the times.Based on the study,practical countermeasures and suggestions were given to provide reference for the construction of smart tourism,ensure the continuous improvement of smart tourism construction,and help the upgrading and transformation of tourism in Sanya.Based on the analysis of the construction and data of smart tourism and tourism informatization in Sanya,this article has formed a useful method to help Sanya build an international tourist island and a modern smart tourism city using the Hainan Free Trade Port construction policy. | Kun Zhang Xuebin Huang Dongwei Yang Kaparova·Kumushai Zilu Zhang | 2022 | Proceedings of Business and Economic Studies2022，5，5： | 0 |
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