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| 1 | A Tilt-correction Adaptive Optical System for the Solar Telescope of Nanjing University显示文摘A tilt-correction adaptive optical system installed on the 430 mm Solar Telescope of Nanjing University has been put in operation. It consists of a tip-tilt mirror, a correlation tracker and an imaging CCD camera. An absolute difference algorithm is used for detecting image motion in the correlation tracker. The sampling frequency of the system is 419 Hz. We give a description of the system's configuration, an analysis of its performance and a report of our observational results. A residual jitter of 0.14 arcsec has been achieved. The error rejection bandwidth of the system can be adjusted in the range 5-28 Hz according to the beacon size and the strength of atmospheric turbulence. | Chang-HuiRao Wen-HanJiang ChengFang NingLing Wei-ChaoZhou Ming-DeDing Xue-JunZhang Dong-HongChen meiLi Xiu-FaGao TianMi | 2003 | Chinese Journal of Astronomy and Astrophysics2003，3，6： | 4 |
| 2 | Recent progress and prospect of carbon-free single-site catalysts for the hydrogen and oxygen evolution reactions显示文摘The key challenge for scalable production of hydrogen from water lies in the rational design and preparation of high-performance and earth-abundant electrocatalysts to replace precious metal Pt and IrO_(2) for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Although atomic M-N-C materials have been extensively studied in heterogeneous catalysis field,the insufficient antioxidant capacity of carbonous substrates hinders their practical application in OER.Developing highly active and stable OER electrocatalysts is the key for electrochemical water splitting.This review presents feasible design strategies for fabricating carbon-free single-site catalysts and their applications in HER/OER and overall water splitting.The constitutive relationships between structure,composition,and catalytic performance for HER and OER are detailly discussed,providing ponderable insights into rationally constructing high-performance HER and OER electrocatalysts.The perspectives on the challenges and future research orientations in single-site catalysts for electrochemical water splitting are suggested. | Jingqi Guan Xue Bai Tianmi Tang | 2022 | Nano Research2022，15，2： | 4 |
| 3 | Atomic manganese coordinated to nitrogen and sulfur for oxygen evolution显示文摘Lack of high-efficiency,cost-efficient,and well-stocked oxygen evolution reaction(OER)electrocatalysts is a main challenge in large-scale implementation of electrolytic water.By regulating the electronic structure of isolated single-atom metal sites,highperformance transition-metal-based catalysts can be fabricated to greatly improve the OER performance.Herein,we demonstrate single-atom manganese coordinated to nitrogen and sulfur species in two-dimensional graphene nanosheets MnNSG(NSG means N-and S-codoped graphene)as an active and durable OER catalyst with a low overpotential of 296 mV in alkaline media,compared to that of the benchmark IrO_(2) catalyst.Theoretical calculations and experimental measurements reveal that the Mn-N3S sites in the graphene matrix are the most active sites for the OER due to modified electronic structure of the Mn site by three nitrogen and one sulfur atoms coordination,which show lower theoretical overpotential than the Mn-N4 sites and over which the O–O formation step is the rate-determining step. | Xue Bai Liming Wang Bing Nan Tianmi Tang Xiaodi Niu Jingqi Guan | 2022 | Nano Research2022，15，7： | 3 |
| 4 | Advances and challenges in two-dimensional materials for oxygen evolution显示文摘Oxygen evolution reaction(OER)plays an important role in many energy conversions and storage technologies,such as water splitting,rechargeable metal air batteries,renewable fuel cells,and electrocatalytic carbon dioxide reduction and nitrogen reduction,but its slow kinetics and high overpotential seriously affect the energy efficiency.Fabrication of high-performance and well-stocked OER catalysts is the key to the large-scale implementation of these energy-related technologies.Two-dimensional(2D)materials get a lot of attention as OER catalysts due to their large specific surface area,abundant active sites,and adjustable structures and compositions.Here,an overview is presented for the latest achievements in design and synthesis of 2D materials(including layered double hydroxides,metal-organic frameworks and their derivatives,covalent-organic frameworks,graphene,and black phosphorus)for the OER,emphasizing novel strategies(including metal/nonmetal doping,defect engineering,interface engineering,lattice strain,and fabrication of heterojunction)for achieving high electrocatalytic activity.Peculiarly,the structure–function relationship is analyzed in detail to gain deeper insight into the reaction mechanism,which is crucial to rational design of more high-performance 2D materials for the OER.Finally,the remaining challenges to improve the OER performance of 2D electrocatalysts are put forward to indicate possible future development of 2D materials. | Tianmi Tang Saisai Li Jianrui Sun Zhenlu Wang Jingqi Guan | 2022 | Nano Research2022，15，10： | 1 |
| 5 | Synergy between isolated Fe and Co sites accelerates oxygen evolution显示文摘Dual-metal catalysts with synergistic effect exhibit enormous potential for sustainable electrocatalytic applications and mechanism research.Compared with mono-metal-site catalysts,dual-metal-site catalysts exhibit higher efficiency for the oxygen evolution reaction(OER)due to reduced energy barrier of the process involving proton-coupled multi-electron transfer.Herein,we construct dual-metal Fe-Co sites coordinated with nitrogen in graphene(FeCo-NG),which exhibits high OER performance with onset overpotential of only 126 mV and Tafel slope of 120 mV·dec^(−1),showing that the rate-determining step is controlled by the single-electron transfer step.Theoretical calculations reveal that the FeN_(4)site exhibits lower OER overpotential than the CoN_(4)site due to appropriate adsorption energy of OOH*on the former,while the O^(*)adsorbed on the adjacent Co site could stabilize the OOH*on the FeN_(4)site through hydrogen bond interaction. | Tianmi Tang Zhiyao Duan Didar Baimanov Xue Bai Xinyu Liu Liming Wang Zhenlu Wang Jingqi Guan | 2023 | Nano Research2023，16，2： | 1 |
| 6 | Phase-mediated cobalt phosphide with unique core-shell architecture serving as efficient and bifunctional electrocatalyst for hydrogen evolution and oxygen reduction reaction显示文摘Hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR)have been considered as two critical processes in the field of electrocatalytic water-splitting for hydrogen production and fuel cells.However,the sluggish reaction kinetics of HER and ORR required efficient electrocatalyst such as Pt to promote such process.Transition metal phosphides(TMPs)exhibit great potential to replace noble metal electrocatalysts to accelerate HER and ORR due to their high activity and easy availability.Herein,a highly-efficient bifunctional CoP electrocatalyst for HER and ORR,featuring a unique core-shell structure decorated on nitrogen-doped carbon matrix was designed and constructed via etching a cobalt-based zeolitic imidazolate framework(ZIF-67)with phytic acid(PA)followed by pyrolysis treatment(PA-ZIF-67-900).Experimental results revealed that the pure-phase single-crystalline Co P exhibited outstanding electrocatalytic performance in HER and ORR,superior to Co(PO_(3))_(2) in PA-ZIF-67-700,hybrid phase of Co(PO_(3))_(2) and CoP in PA-ZIF-67-800 and Co_(2)P-doped CoP in PA-ZIF-67-1000.To reach the current density of 10 mA/cm^(2)the as-synthesized Co P required an overpotential of 120 m V for HER in 1 mol/L KOH and half-wave potential of 0.85 V in O_(2)-saturated 0.1 mol/L KOH.This work present new clue for construction of efficient and bifunctional electrocatalyst in the field of energy conversion and storage. | Junsheng Chen Jianfeng Huang Hai Wang Weihang Feng Tianmi Luo Yuzhu Hu Chengke Yuan Liyun Cao Yanni Jie Koji Kajiyoshi Yongqiang Feng | 2022 | Chinese Chemical Letters2022，33，8： | 0 |
| 7 | Facile synthesis of defect-rich Fe-N-C hybrid from fullerene/ferrotetraphenylporphyrin as efficient oxygen reduction electrocatalyst for Zn-air battery显示文摘Exploring remarkable oxygen reduction reaction(ORR)electrocatalysts for regenerative fuel cells and metal-air batteries is highly essential.Herein,a novel non-noble metal-based heterogeneous electrocatalyst with rich defects were successfully synthesized by liquid-liquid interfacial precipitation(LLIP)of fullerene(C_(60))and ferrotetraphenylporphyrin(FeTPP)followed by one step pyrolysis.The obtained product annealed at 700℃(C_(60)/FeTPP-700),when employed as ORR electrocatalyst,revealed a positive halfwave potential(E_(1/2))of 0.877 V vs.reversible hydrogen electrode(RHE),which was superior to that of the commercial 25%Pt/C.Delightfully,the assembled Zn-air battery(ZAB)using C_(60)/FeTPP-700 as an air-electrode catalyst exhibited a high power density of 153 m W/cm^(2),specific capacity of 668 mAh/g and long-term cycling stability for more than 250 h.Experimental results proved that the excellent electrocatalytic ORR activity of C_(60)/FeTPP-700 would attribute to the synergistic effect between FeN_xsites,Fe_(3)C/Fe nanoparticles and the structure defects.This work provides a feasible and simple method to prepare nonnoble metal-based ORR electrocatalysts for the application of energy storage and conversion. | Hai Wang Liyun Cao Yongqiang Feng Junsheng Chen Weihang Feng Tianmi Luo Yuzhu Hu Chengke Yuan Yajuan Zhao Yong Zhao Koji Kajiyoshi Yijun Liu Zhenjiang Li Jianfeng Huang | 2023 | Chinese Chemical Letters2023，34，5： | 0 |
| 8 | 巴黎,奢侈品的秘密约会显示文摘超现实的想象力和高贵的城市气质造就了巴黎奢侈品之都的形象。 | Tianmi | 2006 | 品质.品牌2006，，9： | 0 |
| 9 | Diatomic Fe-Co catalysts synergistically catalyze oxygen evolution reaction显示文摘The design of diatomic catalysts with uniformly dispersed metal atoms is expected to improve catalytic performance,which is conducive to the intensive comprehending of the synergistic mechanism between dual-metal sites for the oxygen evolution reaction(OER)at the atomic level.Herein,we design a strategy to immobilize bimetallic Fe-Co atoms onto nitrogen-doped graphene to obtain a diatomic catalyst(DA-FC-NG)with FeN_(3)-CoN_(3) configuration.The DA-FC-NG shows excellent OER activity with a low overpotential(η_(10)=268 mV),which is superior to commercial iridium dioxide catalysts.Theoretical calculations uncover that the excellent activity of DA-FC-NG is due to the interaction between Fe and Co diatoms,which causes charge rearrangement and induces the adsorption of intermediates on the Fe-O-Co bridge structure,thus improving the catalytic OER performance.This work is of great significance for the design of highly active diatomic catalysts to replace noble metal catalysts for energy-related applications. | Tianmi Tang Jingyi Han Zhenlu Wang Xiaodi Niu Jingqi Guan | 2024 | Nano Research2024，17，5： | 0 |
| 10 | Surface reconstruction and structural transformation of twodimensional Ni-Fe MOFs for oxygen evolution in seawater media显示文摘As a four-electron transfer reaction,oxygen evolution reaction(OER)is limited by large overpotential and slow kinetics.Here,we in-situ synthesized two-dimensional(2D)Ni-Fe metal-organic framework nanosheets on nickel foam(NixFe-TPA/NF,TPA=terephthalic acid)for oxygen evolution in alkaline and alkaline seawater electrolytes.In 1 M KOH,Ni3Fe-TPA/NF shows a low overpotential(η10)of 189 mV at 10 mA·cm^(-2) and an ultra-low overpotential of only 260 mV at 500 mA·cm^(-2).In alkaline seawater,Ni3Fe-TPA/NF still provides impressive OER performance,with anη10 of 265 mV.In-situ Raman characterization results show that the phase transition occurs during the OER,and Ni3FeOOH with more oxygen vacancies is in-situ formed,reducing the OER energy barrier.Density functional theory(DFT)reveals that the synergy between Ni and Fe reduces the energy barrier and accelerates the rate-determining step.In addition,the ultra-thin 2D sheet structure and the close combination of Ni3FeOOH and highly conductive NF support ensure the high catalytic OER activity.Therefore,the surface reconstruction and structural modification strategy can be used to design and prepare high-performance OER electrocatalysts for energy-related applications. | Liyuan Xiao Xue Bai Jingyi Han Tianmi Tang Siyu Chen Hui Qi Changmin Hou Fuquan Bai Zhenlu Wang Jingqi Guan | 2024 | Nano Research2024，17，4： | 0 |
| 11 | Outage-driven link selection for secure buffer-aided networks显示文摘In this paper, we investigate secure communication in a two-hop wireless network, where multiple buffer-aided relays assist to securely forward data from the sender to the destination threatened by a passive eavesdropper. To satisfy the security and delay requirements, we propose a novel link selection policy without the instantaneous wiretap channel state information. Different from the most current link selection policies,the proposed link selection policy is designed by joint considering the link secrecy outage probability and the buffer states. To evaluate the secrecy performance, we first characterize the system state transition matrix and the stationary state probability, and then derive the closed-form expressions for the secrecy outage probability and the secrecy rate. Moreover, we formulate a framework based on the queuing theory to analyze the end-to-end information delay at the source, the relays, and the queues, and derive the closed-form expression for the information delay. Finally, we conduct simulations to validate our theoretical performance analysis, and verify the performance improvement of the proposed outage-driven secure transmission scheme in terms of secrecy outage probability and information delay. | Dawei WANG Tianmi HE Fuhui ZHOU Julian CHENG Ruonan ZHANG Qihui WU | 2022 | Science China(Information Sciences)2022，65，8： | 0 |
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