Advanced Energy Materials

Cover image for Vol. 4 Issue 3

February 18, 2014

Volume 4, Issue 3

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    8. Full Papers
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      Nanopatterning: Bifunctional Moth-Eye Nanopatterned Dye-Sensitized Solar Cells: Light-Harvesting and Self-Cleaning Effects (Adv. Energy Mater. 3/2014)

      Sung Yeon Heo, Jong Kwan Koh, Gumin Kang, Sung Hoon Ahn, Won Seok Chi, Kyoungsik Kim and Jong Hak Kim

      Version of Record online: 19 FEB 2014 | DOI: 10.1002/aenm.201470012

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      In article number 1300632, Jong Hak Kim and co-workers present a nanopatterning technique using nanostamps that provides a facile process to create a nature-inspired moth-eye structure. The structure achieves high transmittance in the visible range as well as a self-cleaning effect. The resulting solid-state dye-sensitized solar cells (ssDSSCs) with moth-eye structures exhibit enhancement of efficiency to 7.3% at 100 mW cm−2.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Dye-Sensitized Solar Cells: Physically Stable Polymer-Membrane Electrolytes for Highly Efficient Solid-State Dye-Sensitized Solar Cells with Long-Term Stability (Adv. Energy Mater. 3/2014)

      Sung-Hae Park, Jongchul Lim, In Young Song, Jae-Ryung Lee and Taiho Park

      Version of Record online: 19 FEB 2014 | DOI: 10.1002/aenm.201470013

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      A highly stable, solid-state dye-sensitized solar cell with excellent power conversion efficiency is demonstrated using a novel 3D polymer network membrane (3D-PNM) electrolyte. As reported by Taiho Park and co-workers in article number 1300489, a one-pot, in situ cross-linking polymerization on the surface of TiO2 particles in the presence of redox species encapsulates with a thin porous membrane layer and leads to great physical stability for the 3D-PNM on the surface of the TiO2 electrode.

  3. Masthead

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    4. Masthead
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      Masthead: (Adv. Energy Mater. 3/2014)

      Version of Record online: 19 FEB 2014 | DOI: 10.1002/aenm.201470015

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Contents: (Adv. Energy Mater. 3/2014)

      Version of Record online: 19 FEB 2014 | DOI: 10.1002/aenm.201470014

  5. Reviews

    1. Top of page
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    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
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    1. Polymer Design Strategies for Radiation-Grafted Fuel Cell Membranes

      Lorenz Gubler

      Version of Record online: 19 DEC 2013 | DOI: 10.1002/aenm.201300827

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      For economic viability fuel cell components, such as the polymer electrolyte membrane, need to fulfill the technical requirements and concurrently meet cost targets. Radiation-grafted membranes can be designed to address the various requirements in the fuel cell via a careful and adept choice of base polymer, graft component, and processing conditions. Fundamentals and recent developments in this field are discussed.

  6. Communications

    1. Top of page
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    4. Masthead
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    1. A Stabilized PAN-FeS2 Cathode with an EC/DEC Liquid Electrolyte

      Seoung-Bum Son, Thomas A. Yersak, Daniela Molina Piper, Seul Cham Kim, Chan Soon Kang, Jong Soo Cho, Soon-Sung Suh, Young-Ugk Kim, Kyu Hwan Oh and Se-Hee Lee

      Version of Record online: 11 OCT 2013 | DOI: 10.1002/aenm.201300961

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      Natural cubic-FeS2 is embedded in a stabilized polyacrylonitrile (PAN) matrix. The PAN matrix confines the electroactive reduced species of FeS2 and captures intermediate polysulfide and elemental iron to prevent their dissolution into the electrolyte. The formation of orthorhombic-FeS2 is observed at full charge, which is consistent with previous studies.

    2. Low-Bandgap Donor/Acceptor Polymer Blend Solar Cells with Efficiency Exceeding 4%

      Daisuke Mori, Hiroaki Benten, Izumi Okada, Hideo Ohkita and Shinzaburo Ito

      Version of Record online: 2 OCT 2013 | DOI: 10.1002/aenm.201301006

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      Low-bandgap donor/acceptor polymer blend solar cells are fabricated. The device performance is optimized at a donor:acceptor blending ratio of 70:30 wt% to result in a short-circuit current density of 8.85 mA cm−2, a fill factor of 0.55, and an open circuit voltage of 0.84 V. The high PCE , which exceeds 4%, demonstrates the potential of polymer/polymer blend solar cells as an alternative to polymer/fullerene solar cells.

    3. Morphology-Performance Relationships in High-Efficiency All-Polymer Solar Cells

      Nanjia Zhou, Hui Lin, Sylvia J. Lou, Xinge Yu, Peijun Guo, Eric F. Manley, Stephen Loser, Patrick Hartnett, Hui Huang, Michael R. Wasielewski, Lin X. Chen, Robert P. H. Chang, Antonio Facchetti and Tobin J. Marks

      Version of Record online: 2 OCT 2013 | DOI: 10.1002/aenm.201300785

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      Careful selection of processing solvents to tune optimal active layer morphology in a donor-acceptor copolymer blend [PTB7:P(NDI2OD-T2)] yields bulk heterojunction microstructures with intradomain percolative pathways and enhanced charge transport. Such microstructures afford all-polymer solar cells with power conversion efficiencies as high as 2.7%.

    4. Carbon Nanotube Fiber Based Stretchable Wire-Shaped Supercapacitors

      Ping Xu, Taoli Gu, Zeyuan Cao, Bingqing Wei, Jianyong Yu, Faxue Li, Joon-Hyung Byun, Weibang Lu, Qingwen Li and Tsu-Wei Chou

      Version of Record online: 7 OCT 2013 | DOI: 10.1002/aenm.201300759

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      A stretchable carbon nanotube (CNT) fiber based wire-shaped supercapacitor is fabricated using a prestraining-then-buckling approach. At tensile strains from 0% to 100% or after 20 mechanical stretching-releasing cycles with maximum strain of 100%, the electrochemical properties are not reduced but rather somewhat improved. This may have implications for the integration of wire-shaped supercapacitors with wearable, miniaturized, and portable electronic devices.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Reviews
    7. Communications
    8. Full Papers
    1. Solution-Processed Hydrogen Molybdenum Bronzes as Highly Conductive Anode Interlayers in Efficient Organic Photovoltaics

      Anastasia Soultati, Antonios M. Douvas, Dimitra G. Georgiadou, Leonidas C. Palilis, Thomas Bein, Johann M. Feckl, Spyros Gardelis, Mihalis Fakis, Stella Kennou, Polycarpos Falaras, Thomas Stergiopoulos, Nikolaos A. Stathopoulos, Dimitris Davazoglou, Panagiotis Argitis and Maria Vasilopoulou

      Version of Record online: 2 OCT 2013 | DOI: 10.1002/aenm.201300896

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      The incorporation of solution-processed hydrogen molybdenum bronzes as anode interlayers in organic photovoltaic cells is presented. High power conversion efficiencies are observed in devices based on polymeric donors and fullerene acceptors that include a bronze with a moderate degree of reduction, namely the s-HxMoO2.75, as the anode interlayer.

    2. Graphitic Petal Electrodes for All-Solid-State Flexible Supercapacitors

      Guoping Xiong, Chuizhou Meng, Ronald G. Reifenberger, Pedro P. Irazoqui and Timothy S. Fisher

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/aenm.201300515

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      Thin graphitic petals grown from carbon cloth form the basis of a flexible, solid-state supercapacitor that employs polyaniline coating as the pseudocapacitive material. This structure exhibits very high area-, volume-, and mass-based specific capacitances and energy/power densities. The cyclic stability and Coulombic efficiencies are good, and functional devices exhibit virtually no performance degradation under highly strained bent and twisted conditions.

    3. A Hierarchically Organized Photoelectrode Architecture for Highly Efficient CdS/CdSe-Sensitized Solar Cells

      Jong Hoon Park, Dong Hoe Kim, Seong Sik Shin, Hyun Soo Han, Myeong Hwan Lee, Hyun Suk Jung, Jun Hong Noh and Kug Sun Hong

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/aenm.201300395

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      With their unique nanostructured architecture, hierarchically organized TiO2 nanostructures consisting of open channels of pores are investigated as photoelectrodes for CdS/CdSe-sensitized solar cells (CSSCs). The fabricated CSSCs show an overall energy conversion efficiency of 5.57%, which is highest performance in a CdS/CdSe system. This superior photovoltaic performance comes from the excellent electron lifetime due to the formation of open channels of pores

    4. Electromechanical Properties of Polymer Electrolyte-Based Stretchable Supercapacitors

      Daniel P. Cole, Arava Leela Mohana Reddy, Myung Gwan Hahm, Ryan McCotter, Amelia H. C. Hart, Robert Vajtai, Pulickel M. Ajayan, Shashi P. Karna and Mark L. Bundy

      Version of Record online: 17 SEP 2013 | DOI: 10.1002/aenm.201300844

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      The electromechanical behavior of a flexible, solid state supercapacitor is examined. The structural-electronic material is characterized with galvanostatic charge–discharge with in situ microtensile testing. The capacitance increases by ≈10% as the supercapacitor is mechanically loaded, which is attributed to enhanced electrode–electrolyte interaction. Nanoindentation is used to show improved local mechanical behavior of the composite electrode with respect to the neat polymer electrolyte.

    5. Bifunctional Moth-Eye Nanopatterned Dye-Sensitized Solar Cells: Light-Harvesting and Self-Cleaning Effects

      Sung Yeon Heo, Jong Kwan Koh, Gumin Kang, Sung Hoon Ahn, Won Seok Chi, Kyoungsik Kim and Jong Hak Kim

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/aenm.201300632

      Thumbnail image of graphical abstract

      A nature-inspired moth-eye structure is created via a facile nanopatterning technique using polymeric nanostamps. The resulting solid-state dye-sensitized solar cells show enhancement of efficiency to 7.3% at 100 mW cm−2, which is one of the highest values observed for N719 dye.

    6. Dynamic Nanofin Heat Sinks

      Pyshar Yi, Khashayar Khoshmanesh, Adam F. Chrimes, Jos L. Campbell, Kamran Ghorbani, Saeid Nahavandi, Gary Rosengarten and Kourosh Kalantar-zadeh

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/aenm.201300537

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      An efficient heat transfer technique for cooling microchips is developed using dynamic nanofin heat sinks. CrO2 nanoparticles are magnetically chained and docked onto hot spots, establishing high aspect ratio and flexible nanofins to facilitate the heat exchange between those spots and the liquid coolant. The system enhances the heat transfer and can offer a practical cooling solution for future electronics.

    7. Guiding the Selection of Processing Additives for Increasing the Efficiency of Bulk Heterojunction Polymeric Solar Cells

      Uyxing Vongsaysy, Bertrand Pavageau, Guillaume Wantz, Dario M. Bassani, Laurent Servant and Hany Aziz

      Version of Record online: 23 SEP 2013 | DOI: 10.1002/aenm.201300752

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      The Hansen solubility parameters (HSPs) are investigated for the identification of three novel processing additives. The processing additives are selected as a function of their positions with respect to the solubility spheres of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Significant increases in short-circuit current density and power conversion efficiency of solar cells are obtained, demonstrating the efficiency of the methodology.

    8. Capacitive Energy Harvesting Using Highly Stretchable Silicone–Carbon Nanotube Composite Electrodes

      Paul Brochu, Hristiyan Stoyanov, Ryan Chang, Xiaofan Niu, Wei Hu and Qibing Pei

      Version of Record online: 2 OCT 2013 | DOI: 10.1002/aenm.201300659

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      The development of soft flexible and stretchable silicone–carbon nanotube composite electrodes for use in capacitive energy harvesting and strain sensing is presented. The composite is capable of being stretched to over 150% strain with a minimal increase in the baseline resistance and excellent recovery of electrical properties upon relaxation. Applications of the composite electrode include highly stretchable soft capacitors and energy generators.

    9. Physically Stable Polymer-Membrane Electrolytes for Highly Efficient Solid-State Dye-Sensitized Solar Cells with Long-Term Stability

      Sung-Hae Park, Jongchul Lim, In Young Song, Jae-Ryung Lee and Taiho Park

      Version of Record online: 2 OCT 2013 | DOI: 10.1002/aenm.201300489

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      A 3D polymer-network-membrane (3D-PNM) electrolyte is prepared using one-pot in situ cross-linking polymerization on the surface of dye-sensitized TiO2 particles in the presence of redox species. The dye-sensitized solar cell that employs the 3D-PNM electrolyte exhibits almost constant current during aging at 65 °C for over 700 h.

    10. Strain-Based In Situ Study of Anion and Cation Insertion into Porous Carbon Electrodes with Different Pore Sizes

      Jennifer M. Black, Guang Feng, Pasquale F. Fulvio, Patrick C. Hillesheim, Sheng Dai, Yury Gogotsi, Peter T. Cummings, Sergei V. Kalinin and Nina Balke

      Version of Record online: 8 OCT 2013 | DOI: 10.1002/aenm.201300683

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      Atomic force microscopy is used to monitor the expansion of porous carbon electrodes, which results from insertion/adsorption of ions in carbon pores during charging. The strain data collected at various potential scan rates are used to obtain information on anion and cation kinetics. Molecular dynamics simulations are performed to determine the molecular origins of charge-induced expansion in porous carbons.

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