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| 1 | Negative differential friction coefficients of two-dimensional commensurate contacts dominated by electronic phase transition显示文摘Friction force(f)usually increases with the normal load(N)macroscopically,according to the classic law of Da Vinci–Amontons(f=μN),with a positive and finite friction coefficient(μ).Herein near-zero and negative differential friction(ZNDF)coefficients are discovered in two-dimensional(2D)van der Waals(vdW)magnetic CrI_(3)commensurate contacts.It is identified that the ferromagnetic–antiferromagnetic phase transition of the interlayer couplings of the bilayer CrI_(3)can significantly reduce the interfacial sliding energy barriers and thus contribute to ZNDF.Moreover,phase transition between the in-plane(p_(x)and p_(y))and out-of-plane(p_(z))wave-functions dominates the sliding barrier evolutions,which is attributed to the delicate interplays among the interlayer vdW,electrostatic interactions,and the intralayer deformation of the CrI_(3)layers under external load.The present findings may motivate a new concept of slide-spintronics and are expected to play an instrumental role in design of novel magnetic solid lubricants applied in various spintronic nano-devices. | Kun Liu Jiangtao Cheng Xingju Zhao Yandi Zhu Xiaoyan Ren Jinlei Shi Zhengxiao Guo Chongxin Shan Hongjie Liu Shunfang Li | 2022 | Nano Research2022，15，6： | 0 |
| 2 | Carbon Dots Promote the Performance of Anodized Nickel Passivation Film on Ethanol Oxidation by Enhancing Oxidation of the Intermediate显示文摘Ethanol is considered a better fuel than methanol in direct alcohol fuel cells because of the high energy density and low toxicity.Compared with noble metal catalysts,nickel-based catalysts are much cheaper in price.However,present nickel-based catalysts still surfer from some disadvantages such as low activity and high overpotential.In this paper;we show a new and high efficient nickel-based catalyst for ethanol oxidation.A layer of anodized nickel passivation film(Ni-APF)was formed on the surface of nickel sheet by anodic oxidation method with carbon dots(CDs)as co-catalyst.At the current density of 110 mA·cm^(-2),the potential for Ni-APF/CDs was only 0.541 V(vs.Ag/AgCI),which was 18.8% lower than that of Ni-APF.Low overpotential could reduce electrode thermal loss and increase output energy.Ni-APF/CDs showed 144.4 mA·cm^(-2) peak current density at peak potential 0.662 V(vs.Ag/AgCI),which was 31% higher than that of Ni-APF(110.3 mA·cm^(-2)).In this system,CDs mainly function in the increase of charge-transfer capacity and the promotion oxidation of carbonaceous intermediates. | Yandi Shi Fan Liao Wenxiang Zhu Huixian Shi Kui Yin Mingwang Shao | 2021 | Chinese Journal of Chemistry2021，39，5： | 0 |
| 3 | C–H…S Hydrogen Bond Assisted Supramolecular Encapsulation of Fullerenes with Nanobelts显示文摘Hydrogen-bonded capsules have been widely employed as supramolecular hosts for organic molecular guests.Encapsulation of fullerenes by capsules is relatively scarce,especially those that utilize sulfur atoms as hydrogen-bond acceptors.Herein,we describe,in both solution and solid state,a bowl-shaped nanobelt[8]cyclophenoxathiin 1a and its tetra-methylated derivative 1b that can form C–H⋯S hydrogen-bonded capsules induced by complexation with suitable fullerenes.1a strongly encapsulates C60,C70,or 6,6-phenyl-C61-butyric acid methyl ester(PC61BM)to form a 2∶1 ternary complex featuring 16 equatorial(sp2)C–H⋯S hydrogen bonds.A pseudorotaxane structure was further obtained for the complex of 1a with PC61BM.Conversely,a 1∶1 inclusion complex was observed for binding C60 or PC61BM with 1b indicating the reduced tendency to form capsules by introducing methyl groups into the belt.Surprisingly,the capsule-like structure was retained for the 1:2 complex of C70 with 1b as observed by the presence of multiple(sp3)C–H⋯S hydrogen bonds.The strong binding affinity and tailorable complexation mode enable further applications of nanobelts in fullerene chemistry. | Jialin Xie Xia Li Zhenglin Du Yandie Liu Kelong Zhu | 2023 | CCS Chemistry2023，5，4： | 0 |
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