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| 1 | A synergy establishment by metal-organic framework and carbon quantum dots to enhance electrochemical water oxidation显示文摘Available online Integrating transition metal centered MOFs with conductive materials is a feasible route to enhance electron transfer efficiency of materials.Herein,a composite porous structure CQDs_(10)@NiFe-MOF-A was fabricated via introducing carbon quantum dots(CQDs)into porous NiFe-MOF.The CQDs would make partial loss of lattice in MOF during its growth,leading to the composite building block with the coexistance of crystalline region and amorphous region.The calcining treatment would produce an ultrathin protective layer as well as some lattice collapse.The synergy effect between NiFe ions effectively regulated electronic structure of metal active sites,and successful grafting of CQDs to NiFe-MOF significantly improved electrical conductivity.As expected,the catalyst exhibited outstanding OER performances with high mass activity of 91.6 A/g at overpotential of 300 mV and robust durability of 10,000 cycles in 1 mol/L KOH,which outperformed that of noble catalyst IrO_(2)of 25.2 A/g.The strategy paves a feasible and effective avenue for the non-noble metal catalysts. | Qiuxiang Mou Xuan Wang Zhenhang Xu Pnur Zul Erlei Li Pingping Zhao Xinghai Liu Houbin Li Gongzhen Cheng | 2022 | Chinese Chemical Letters2022，33，1： | 2 |
| 2 | Fiber guiding at the Dirac frequency beyond photonic bandgaps显示文摘Light trapping within waveguides is a key practice of modern optics,both scientifically and technologically.Photonic crystal fibers traditionally rely on total internal reflection(index-guiding fibers)or a photonic bandgap(photonic-bandgap fibers)to achieve field confinement.Here,we report the discovery of a new light trapping within fibers by the so-called Dirac point of photonic band structures.Our analysis reveals that the Dirac point can establish suppression of radiation losses and consequently a novel guided mode for propagation in photonic crystal fibers.What is known as the Dirac point is a conical singularity of a photonic band structure where wave motion obeys the famous Dirac equation.We find the unexpected phenomenon of wave localization at this point beyond photonic bandgaps.This guiding relies on the Dirac point rather than total internal reflection or photonic bandgaps,thus providing a sort of advancement in conceptual understanding over the traditional fiber guiding.The result presented here demonstrates the discovery of a new type of photonic crystal fibers,with unique characteristics that could lead to new applications in fiber sensors and lasers.The Dirac equation is a special symbol of relativistic quantum mechanics.Because of the similarity between band structures of a solid and a photonic crystal,the discovery of the Dirac-point-induced wave trapping in photonic crystals could provide novel insights into many relativistic quantum effects of the transport phenomena of photons,phonons,and electrons. | Kang Xie Wei Zhang Allan D Boardman Haiming Jiang Zhijia Hu Yong Liu Ming Xie Qiuping Mao Lei Hu Qian Li Tianyu Yang Fei Wen Erlei Wang | 2015 | Light(Science & Applications)2015，4，1： | 1 |
| 3 | Static and dynamic mechanical properties of concrete after high temperature exposure显示文摘 | Li Zhiwu Xu Jinyu Bai Erlei | 2012 | Mate rials Science and Engineering A2012，544，： | 1 |
| 4 | Static and dynamic mechanical properties of concrete after high temperature exposure显示文摘 | Li Zhiwu Xua Jinyu Baia Erlei | 2012 | Materials Science and Engineering A2012，544，： | 1 |
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