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| 1 | Embedding Pd-Cu Alloy Nanoparticles in Shell of Surface-Porous N-Doped Carbon Nanosphere for Selective Hydrogenation of p-Chloronitrobenzene显示文摘Main observation and conclusion A catalyst PdxCuy/NC in which Pd-Cu alloy nanoparticles are superficially embeded in shell of surface-porous N-doped carbon nanosphere was successfully devised for p-chloronitrobenzene(p-CNB)selective hydrogenation.Bimetal ions were loaded in shell of a m-phenylenediamine derived core-shell polymer sphere and the catalyst was obtained after calcination under reducing atmosphere.The as synthesized catalyst exhibited high selectivity in hydrogenation of p-CNB to p-chloroaniline(p-CAN)(up to 98.8%)under full conversion and the performance was basically remained after 6 cyclic experiments.The reasons for the high selectivity were discussed based on the characterization results of catalyst.The interaction between N-doped support and metal atoms affected the electron distribution in alloy,electron-deficient Pd and electron-rich Cu,and thus improved hydrogenation selectivity.In addition,the alloy nanoparticles were distributed only in the porous shell of support,which benefits to prevent side reactions.This work described a scheme for tactfully designing catalyst for selective hydrogenation,which can provide experience and inspiration for relevant works and fields. | Yingcen Liu Wanyue Ye Hua Lin Caicheng Song Zeming Rong Rongwen Lu Hao Zhang He Huang Zhicheng Tang Shufen Zhang | 2021 | Chinese Journal of Chemistry2021，39，10： | 0 |
| 2 | 过渡金属二硫化物MnNb_(3)S_(6)的物性研究显示文摘目的:探究过渡金属二硫化物MnNb_(3)S_(6)的磁性和电输运性质。方法:采用固相反应法和气相输运法制备了MnNb_(3)S_(6)单晶样品,利用X射线衍射对样品结构进行表征,并利用磁性测量系统(MPMS)和物性测量系统(PPMS)对其磁性以及电输运性质进行测量。结果:MnNb_(3)S_(6)在温度108 K以下具有铁磁性,在温度125 K以下具有显著的负磁阻行为。磁化强度表现出较强的各向异性。霍尔电阻率测量表明MnNb_(3)S_(6)具有典型的反常霍尔效应。结论:MnNb_(3)S_(6)具有铁磁性、低温负磁阻、磁各向异性,同时还存在反常霍尔效应。 | 陈煜迪 戴翔飞 王子 张子扬 杜建华 焦志伟 | 2023 | 中国计量大学学报2023，34，2： | 0 |
| 3 | Atmospheric Degradation and Performance Recovery of Two-Dimensional MoS2 Field Effect Transistor显示文摘Two-dimensional(2D)transition metal dichalcogenides(TMDCs)showed great potentials in 2D nanoelectronic devices due to their abundant and unique properties.The performance stability of the 2D TMDCs devices turns into one of the keys for their practical applications but has been rarely explored.Here,we investigated stability of MoS_(2)devices in ambient condition and contributed the device performance degradation to the surface oxidation of the contact metals with low work function,which increased the contact barrier and hindered the electron injection.We developed a new approach to recover the performance of the aged devices through the selective doping of contacts with organolithium,which prolonged the lifetime of MoS_(2)devices.Our work not only provides important insights into the stability of 2D TMDCs devices,but also opens up a new avenue for optimizing the performance of 2D MoS_(2)devices. | Lifei Sun Zhixing Lu Rui Xu Zhewei Li Guanchen Xu Fengen Chen Zhihai Cheng Liying Jiao | 2023 | Chinese Journal of Chemistry2023，41，21： | 0 |
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