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  1. A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid-Dopants

    Yi Zhang, Zhaofu Fei, Peng Gao, Yonghui Lee, Farzaneh Fadaei Tirani, Rosario Scopelliti, Yaqing Feng, Paul J. Dyson and Mohammad Khaja Nazeeruddin

    Version of Record online: 25 JUL 2017 | DOI: 10.1002/adma.201702157

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    Perovskite films, grown from PbI2:MAI in DMSO in the presence of functionalized ionic liquid (imidazolium iodide) dopants and incorporated into perovskite solar cells, are reported. One cell has a power conversion efficiency exceeding 19%. Difference in power conversion efficiency can be traced to the physical properties of imidazolium-PbI3 salts that form during the preparation of the film.

  2. Transparent, Flexible, and Conductive 2D Titanium Carbide (MXene) Films with High Volumetric Capacitance

    Chuanfang (John) Zhang, Babak Anasori, Andrés Seral-Ascaso, Sang-Hoon Park, Niall McEvoy, Aleksey Shmeliov, Georg S. Duesberg, Jonathan N. Coleman, Yury Gogotsi and Valeria Nicolosi

    Version of Record online: 25 JUL 2017 | DOI: 10.1002/adma.201702678

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    Highly transparent and conductive Ti3C2Tx films and their application as transparent, solid-state supercapacitors are demonstrated. Films with transmittance of 93% (≈4 nm) and 29% (≈88 nm) demonstrate DC conductivity of ≈5736 and ≈9880 S cm−1, respectively. The Ti3C2Tx films display impressive volumetric capacitance (676 F cm−3), high areal capacitance, and long lifetime in the transparent solid-state supercapacitor devices.

  3. Hollow MXene Spheres and 3D Macroporous MXene Frameworks for Na-Ion Storage

    Meng-Qiang Zhao, Xiuqiang Xie, Chang E. Ren, Taron Makaryan, Babak Anasori, Guoxiu Wang and Yury Gogotsi

    Version of Record online: 25 JUL 2017 | DOI: 10.1002/adma.201702410

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    Hollow Ti3C2Tx spheres and 3D macroporous MXene films are fabricated using a sacrificial template approach. The 3D MXene films are free-standing, flexible, and highly conductive. They can serve directly as electrodes for Na-ion storage and exhibit high capacities accompanied with excellent stabilities and rate performance.

  4. Reversible, Fast, and Wide-Range Oxygen Sensor Based on Nanostructured Organometal Halide Perovskite

    Marc-Antoine Stoeckel, Marco Gobbi, Sara Bonacchi, Fabiola Liscio, Laura Ferlauto, Emanuele Orgiu and Paolo Samorì

    Version of Record online: 25 JUL 2017 | DOI: 10.1002/adma.201702469

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    Oxygen gas isfound to induce a colossal change in the electrical current flowing through organometallic hybrid perovskites, paving the way to the demonstration of fast, fully reversible, and wide-range oxygen sensors. The efficiency of the sensing element depends dramatically on the nanoscale morphology of the material, which can be controlled by optimization of the deposition process.

  5. Porous Organic Polymers for Post-Combustion Carbon Capture

    Lanfang Zou, Yujia Sun, Sai Che, Xinyu Yang, Xuan Wang, Matheiu Bosch, Qi Wang, Hao Li, Mallory Smith, Shuai Yuan, Zachary Perry and Hong-Cai Zhou

    Version of Record online: 25 JUL 2017 | DOI: 10.1002/adma.201700229

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    Significant progress has been made in the exploration of porous organic polymers (POPs) as potential porous solid adsorbents for carbon capture. A detailed correlation study between the structural and chemical features of POPs and their adsorption capacities is discussed, mainly focusing on physical interactions and chemical reactions.