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  1. On the Existence of Excitonic Signatures in the Optical Response of Metal–Organic Frameworks: Comment on “van der Waals Metal–Organic Framework as an Excitonic Material for Advanced Photonics”

    R. G. Polozkov, N. Y. Senkevich, I. I. Vrubel and I. A. Shelykh

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/adma.201702463

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    The origin of the experimentally reported absorption peak in metal–organic frameworks (MOFs) at room temperatures is discussed. It is shown that a previously proposed excitonic interpretation is probably incorrect and an alternative interpretation based on single-electron optical transitions between narrow π-bands in the system of the aromatic rings of the ligand is proposed, which agrees better with the experimental data.

  2. You have full text access to this OnlineOpen article
    Response to Comment “On the Existence of Excitonic Signatures in the Optical Response of Metal–Organic Frameworks”

    Valentin A. Milichko, Elena V. Khramenkova, Vladimir P. Dzyuba and Evgeny A. Pidko

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/adma.201705261

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    The concerns that were raised in a Comment to previous work are addressed by clarifying the potential pitfalls in density functional theory (DFT) simulations, careful analysis of prior literature, and additional discussion relating to the experimental results, to emphasize the applicability of the excitonic concept in molecular crystals such as MOFs.

  3. A New 3D Printing Strategy by Harnessing Deformation, Instability, and Fracture of Viscoelastic Inks

    Hyunwoo Yuk and Xuanhe Zhao

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/adma.201704028

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    A new 3D printing strategy is reported by harnessing deformation, instability, and fracture of viscoelastic inks. The new strategy allows a single nozzle printing of various fiber diameters and patterns for viscoelastic inks. Furthermore, selection parameters for the new 3D printing strategy can be rationally guided by a quantitative phase diagram.

  4. Boosting Bifunctional Oxygen Electrocatalysis with 3D Graphene Aerogel-Supported Ni/MnO Particles

    Gengtao Fu, Xiaoxiao Yan, Yifan Chen, Lin Xu, Dongmei Sun, Jong-Min Lee and Yawen Tang

    Version of Record online: 13 DEC 2017 | DOI: 10.1002/adma.201704609

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    A bifunctional 3D porous graphene aerogel-supported Ni/MnO (Ni–MnO/rGO aerogel) catalyst is reported that exhibits excellent electrocatalytic activity and stability for the oxygen-reduction and oxygen-evolution reactions in alkaline media. The Ni–MnO/rGO-driven Zn–air batteries can be stably charged and discharged over 100 cycles with high voltaic efficiency, outperforming the more costly Pt/C + RuO2 catalyst-driven Zn–air batteries.

  5. High-Performance As-Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

    Qunping Fan, Yan Wang, Maojie Zhang, Bo Wu, Xia Guo, Yufeng Jiang, Wanbin Li, Bing Guo, Chennan Ye, Wenyan Su, Jin Fang, Xuemei Ou, Feng Liu, Zhixiang Wei, Tze Chien Sum, Thomas P. Russell and Yongfang Li

    Version of Record online: 13 DEC 2017 | DOI: 10.1002/adma.201704546

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    An efficient polymer solar cell (PSC) based on a polymer donor PM6 containing BDT-2F unit and an n-type organic semiconductor acceptor 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) is developed. The power conversion efficiencies of PSCs without extra treatments reach up to 11.9% and are insensitive to the active layer thickness (95–225 nm) and device area (0.20–0.81 cm2) with the values of over 11%.