Advanced Energy Materials

Cover image for Vol. 2 Issue 2

February, 2012

Volume 2, Issue 2

Pages 173–272

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Organic Solar Cells: Molecular Understanding of the Open-Circuit Voltage of Polymer:Fullerene Solar Cells (Adv. Energy Mater. 2/2012) (page 173)

      Shunsuke Yamamoto, Akiko Orimo, Hideo Ohkita, Hiroaki Benten and Shinzaburo Ito

      Article first published online: 17 FEB 2012 | DOI: 10.1002/aenm.201290008

      Thumbnail image of graphical abstract

      The molecular mechanism underlying open-circuit voltage (VOC) is studied by analyzing current–voltage characteristics of solar cells on the basis of the equivalent circuit model. As reported by H. Ohkita and co-workers on page 229, VOC is found to depend not only on the HOMO–LUMO energy gap but also on the electronic couplings of the cell components. This suggests that recombination in the blends studied is not a diffusion-limited reaction. On the basis of these findings, a molecular design is proposed to achieve an improved VOC effectively without loss of the charge-generation efficiency.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Lithium-Ion Batteries: Three-Dimensional Porous Core-Shell Sn@Carbon Composite Anodes for High-Performance Lithium-Ion Battery Applications (Adv. Energy Mater. 2/2012) (page 174)

      Xifei Li, Abirami Dhanabalan and Chunlei Wang

      Article first published online: 17 FEB 2012 | DOI: 10.1002/aenm.201290009

      Thumbnail image of graphical abstract

      The big challenge of repeated volume expansion/contraction upon cycling inhibits Sn anodes from application in high-performance lithium ion batteries, despite superior lithium storage. 3D porous core-shelled Sn@carbon composite anodes fabricated by electrostatic spray deposition are described by C. Wang and co-authors on page 238. These composites show excellent battery performance over a long cycle life. A high energy capacity of 638 mAh g−1 is achieved in the 315th charge/discharge cycle with a low capacity fade of 0.11 mAh g−1 per cycle. This enhanced performance is mainly attributed to the porous structure and conductive carbon shell, which acts as an interconnected buffer cushion to alleviate volume change during charge/discharge cycling.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Masthead: (Adv. Energy Mater. 2/2012)

      Article first published online: 17 FEB 2012 | DOI: 10.1002/aenm.201290010

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Contents: (Adv. Energy Mater. 2/2012) (pages 175–178)

      Article first published online: 17 FEB 2012 | DOI: 10.1002/aenm.201290007

  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Controlled Synthesis and Energy Applications of One-Dimensional Conducting Polymer Nanostructures: An Overview (pages 179–218)

      Zhigang Yin and Qingdong Zheng

      Article first published online: 8 DEC 2011 | DOI: 10.1002/aenm.201100560

      Thumbnail image of graphical abstract

      One-dimensional (1D) conducting polymer nanostructures, prepared by either template-based or template-free methods, are of significant importance for energy conversion and storage applications due to their salient characteristics. In this review, their applications in solar cells, fuel cells, lithium batteries, and supercapacitors are comprehensively discussed along with some perspectives in this emerging area of research.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Stable Dye-Sensitized Solar Cells by Encapsulation of N719-Sensitized TiO2 Electrodes Using Surface-Induced Cross-Linking Polymerization (pages 219–224)

      Sung-Hae Park, Jongchul Lim, In Young Song, Narender Atmakuri, Seulki Song, Young Soo Kwon, Jong Min Choi and Taiho Park

      Article first published online: 8 DEC 2011 | DOI: 10.1002/aenm.201100533

      Thumbnail image of graphical abstract

      Encapsulation of a N719-sensitized TiO2 electrode is successfully achieved through surface-induced cross-linking polymerization of a coadsorbent, which forms a robust, network polymer film. Dye- sensitized solar cells with the film exhibit a remarkable long-term stability (>95% of the initial activity after 480 h) with simultaneous improvement in JSC and VOC, even with 23% lower N719 coverage relative to the control device.

    2. Highly Selective CO2-Capturing Polymeric Organic Network Structures (pages 225–228)

      Hyung Joon Jeon, Jung Hoon Choi, Yeob Lee, Kyung Min Choi, Jung Hyo Park and Jeung Ku Kang

      Article first published online: 5 JAN 2012 | DOI: 10.1002/aenm.201100648

      Thumbnail image of graphical abstract

      Polymeric organic network structures are synthesized using (methanetetrayltetra-4,1-phenylene)tetrakisboronic acid and three kinds of halogen-substituted struts that include heterocyclic groups. While the networks have moderate surface areas, they exhibit good capture and uptake capacities for CO2 and very high selectivity over CH4 and H2 at 298 K and under 1 bar gas pressure.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Review
    7. Communications
    8. Full Papers
    1. Molecular Understanding of the Open-Circuit Voltage of Polymer:Fullerene Solar Cells (pages 229–237)

      Shunsuke Yamamoto, Akiko Orimo, Hideo Ohkita, Hiroaki Benten and Shinzaburo Ito

      Article first published online: 14 NOV 2011 | DOI: 10.1002/aenm.201100549

      Thumbnail image of graphical abstract

      The origin of open-circuit voltage (VOC) was studied for polymer solar cells based on P3HT and fullerene derivatives with different LUMO levels. By analyzing JV characteristics in the dark, it is found that VOC depends not only on the HOMO–LUMO energy gap but also on the electronic couplings of fullerene/fullerene and P3HT/fullerene.

    2. Three-Dimensional Porous Core-Shell Sn@Carbon Composite Anodes for High-Performance Lithium-Ion Battery Applications (pages 238–244)

      Xifei Li, Abirami Dhanabalan, Lin Gu and Chunlei Wang

      Article first published online: 14 NOV 2011 | DOI: 10.1002/aenm.201100380

      Thumbnail image of graphical abstract

      A three-dimensional porous core-shell Sn@carbon composite anode has been engineered to enhance the electrochemical performance of lithium-ion batteries. The enhanced performance is mainly attributed to the porous carbon shell acting as an interconnected buffer cushion to alleviate volume change during charge/discharge processes.

    3. Molecular Design of Interfacial Modifiers for Polymer-Inorganic Hybrid Solar Cells (pages 245–252)

      Jusfong Yu, Tsung-Lung Shen, Wei-Hsiang Weng, Yu-Chen Huang, Ching-I Huang, Wei-Fang Su, Syang-Peng Rwei, Kuo-Chuan Ho and Leeyih Wang

      Article first published online: 25 NOV 2011 | DOI: 10.1002/aenm.201100581

      Thumbnail image of graphical abstract

      Applying conjugated cyanoacrylic acids as the interfacial modifiers (IMs) of TiO2/poly(3-hexylthiophene) simultaneously increases the short-circuit current and open-circuit voltage of hybrid solar cells. External quantum efficiency spectra demonstrates that the lowest unoccupied molecular orbital of IMs plays an important role in determining the degree of contribution of poly(3-hexylthiophene) excitons to the photocurrent.

    4. A High Efficiency Electrodeposited Cu2ZnSnS4 Solar Cell (pages 253–259)

      Shafaat Ahmed, Kathleen B. Reuter, Oki Gunawan, Lian Guo, Lubomyr T. Romankiw and Hariklia Deligianni

      Article first published online: 23 NOV 2011 | DOI: 10.1002/aenm.201100526

      Thumbnail image of graphical abstract

      A high efficiency electroplated Cu2ZnSnS4 earth-abundant solar cell is demonstrated. A power conversion efficiency of 7.3% is measured in the champion device. The achieved power conversion efficiency demonstrates that electrodeposition and annealing is a viable approach for low-cost thin-film earth-abundant solar cell fabrication.

    5. A Systematic Approach to the Design Optimization of Light-Absorbing Indenofluorene Polymers for Organic Photovoltaics (pages 260–265)

      James Kirkpatrick, Christian B. Nielsen, Weimin Zhang, Hugo Bronstein, R. Shahid Ashraf, Martin Heeney and Iain McCulloch

      Article first published online: 9 JAN 2012 | DOI: 10.1002/aenm.201100622

      Thumbnail image of graphical abstract

      A series of fused aromatic push–pull copolymers for organic solar cells is presented. A retrospective analysis based on molecular calculations affords good estimates of the experimental absorption energies and ionization potentials. Comparing photovoltaic device performances of the polymer series to the trend in efficiencies predicted by computation confirms the validity of this approach.

    6. Electrochemically Synthesized Polypyrrole/Graphene Composite Film for Lithium Batteries (pages 266–272)

      Yang Yang, Caiyun Wang, Binbin Yue, Sanjeev Gambhir, Chee O. Too and Gordon G. Wallace

      Article first published online: 19 JAN 2012 | DOI: 10.1002/aenm.201100449

      Thumbnail image of graphical abstract

      A polypyrrole/reduced graphene oxide (PPy/r-GO) film is prepared by a simple electrochemical method. This electrode demonstrates a high rate capability and excellent cycling stability as a cathode in a lithium ion battery. It also delivers a large reversible capacity when used as an anode material, mainly attributed to the r-GO component.

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