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Zhong Lin Wang - One of the best experts on this subject based on the ideXlab platform.

  • liquid metal electrode for high performance triboelectric nanogenerator at an instantaneous Energy Conversion Efficiency of 70 6
    Advanced Functional Materials, 2015
    Co-Authors: Wei Tang, Tao Jiang, Ai Fang Yu, Chi Zhang, Zhong Lin Wang
    Abstract:

    Harvesting ambient mechanical Energy is a key technology for realizing self-powered electronics, which has tremendous applications in wireless sensing networks, implantable devices, portable electronics, etc. The currently reported triboelectric nanogenerator (TENG) mainly uses solid materials, so that the contact between the two layers cannot be 100% with considering the roughness of the surfaces, which greatly reduces the total charge density that can be transferred and thus the total Energy Conversion Efficiency. In this work, a liquid-metal-based triboelectric nanogenerator (LM-TENG) is developed for high power generation through Conversion of mechanical Energy, which allows a total contact between the metal and the dielectric. Due to that the liquid–solid contact induces large contacting surface and its shape adaptive with the polymer thin films, the LM-TENG exhibits a high output charge density of 430 μC m−2, which is four to five times of that using a solid thin film electrode. And its power density reaches 6.7 W m−2 and 133 kW m−3. More importantly, the instantaneous Energy Conversion Efficiency is demonstrated to be as high as 70.6%. This provides a new approach for improving the performance of the TENG for special applications. Furthermore, the liquid easily fluctuates, which makes the LM-TENG inherently suitable for vibration Energy harvesting.

Guozhong Cao - One of the best experts on this subject based on the ideXlab platform.

  • polydisperse aggregates of zno nanocrystallites a method for Energy Conversion Efficiency enhancement in dye sensitized solar cells
    Advanced Functional Materials, 2008
    Co-Authors: Qifeng Zhang, Tammy P. Chou, Bryan J. Russo, Samson A. Jenekhe, Guozhong Cao
    Abstract:

    ZnO films consisting of either polydisperse or monodisperse aggregates of nanocrystallites were fabricated and studied as dye-sensitized solar-cell electrodes. The results revealed that the overall Energy-Conversion Efficiency of the cells could be significantly affected by either the average size or the size distribution of the ZnO aggregates. The highest overall Energy-Conversion Efficiency of ∼4.4% was achieved with the film formed by polydisperse ZnO aggregates with a broad size distribution from 120 to 360 nm in diameter. Light scattering by the submicrometer-sized ZnO aggregates was employed to explain the improved solar-cell performance through extending the distance travelled by light so as to increase the light-harvesting Efficiency of photoelectrode film. The broad distribution of aggregate size provides the ZnO films with both better packing and an enhanced ability to scatter the incident light, and thus promotes the solar-cell performance.

  • Polydisperse Aggregates of ZnO Nanocrystallites: A Method for Energy‐Conversion‐Efficiency Enhancement in Dye‐Sensitized Solar Cells
    Advanced Functional Materials, 2008
    Co-Authors: Qifeng Zhang, Tammy P. Chou, Bryan J. Russo, Samson A. Jenekhe, Guozhong Cao
    Abstract:

    ZnO films consisting of either polydisperse or monodisperse aggregates of nanocrystallites were fabricated and studied as dye-sensitized solar-cell electrodes. The results revealed that the overall Energy-Conversion Efficiency of the cells could be significantly affected by either the average size or the size distribution of the ZnO aggregates. The highest overall Energy-Conversion Efficiency of ∼4.4% was achieved with the film formed by polydisperse ZnO aggregates with a broad size distribution from 120 to 360 nm in diameter. Light scattering by the submicrometer-sized ZnO aggregates was employed to explain the improved solar-cell performance through extending the distance travelled by light so as to increase the light-harvesting Efficiency of photoelectrode film. The broad distribution of aggregate size provides the ZnO films with both better packing and an enhanced ability to scatter the incident light, and thus promotes the solar-cell performance.

Qifeng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • polydisperse aggregates of zno nanocrystallites a method for Energy Conversion Efficiency enhancement in dye sensitized solar cells
    Advanced Functional Materials, 2008
    Co-Authors: Qifeng Zhang, Tammy P. Chou, Bryan J. Russo, Samson A. Jenekhe, Guozhong Cao
    Abstract:

    ZnO films consisting of either polydisperse or monodisperse aggregates of nanocrystallites were fabricated and studied as dye-sensitized solar-cell electrodes. The results revealed that the overall Energy-Conversion Efficiency of the cells could be significantly affected by either the average size or the size distribution of the ZnO aggregates. The highest overall Energy-Conversion Efficiency of ∼4.4% was achieved with the film formed by polydisperse ZnO aggregates with a broad size distribution from 120 to 360 nm in diameter. Light scattering by the submicrometer-sized ZnO aggregates was employed to explain the improved solar-cell performance through extending the distance travelled by light so as to increase the light-harvesting Efficiency of photoelectrode film. The broad distribution of aggregate size provides the ZnO films with both better packing and an enhanced ability to scatter the incident light, and thus promotes the solar-cell performance.

  • Polydisperse Aggregates of ZnO Nanocrystallites: A Method for Energy‐Conversion‐Efficiency Enhancement in Dye‐Sensitized Solar Cells
    Advanced Functional Materials, 2008
    Co-Authors: Qifeng Zhang, Tammy P. Chou, Bryan J. Russo, Samson A. Jenekhe, Guozhong Cao
    Abstract:

    ZnO films consisting of either polydisperse or monodisperse aggregates of nanocrystallites were fabricated and studied as dye-sensitized solar-cell electrodes. The results revealed that the overall Energy-Conversion Efficiency of the cells could be significantly affected by either the average size or the size distribution of the ZnO aggregates. The highest overall Energy-Conversion Efficiency of ∼4.4% was achieved with the film formed by polydisperse ZnO aggregates with a broad size distribution from 120 to 360 nm in diameter. Light scattering by the submicrometer-sized ZnO aggregates was employed to explain the improved solar-cell performance through extending the distance travelled by light so as to increase the light-harvesting Efficiency of photoelectrode film. The broad distribution of aggregate size provides the ZnO films with both better packing and an enhanced ability to scatter the incident light, and thus promotes the solar-cell performance.

Liwei Lin - One of the best experts on this subject based on the ideXlab platform.

  • Direct-write piezoelectric polymeric nanogenerator with high Energy Conversion Efficiency
    Nano Letters, 2010
    Co-Authors: Chieh Chang, Van H. Tran, Yiin-kuen Fuh, Jun-bo Wang, Liwei Lin
    Abstract:

    Nanogenerators capable of converting Energy from mechanical sources to electricity with high effective Efficiency using low-cost, nonsemiconducting, organic nanomaterials are attractive for many applications, including Energy harvesters. In this work, near-field electrospinning is used to direct-write poly(vinylidene fluoride) (PVDF) nanofibers with in situ mechanical stretch and electrical poling characteristics to produce piezoelectric properties. Under mechanical stretching, nanogenerators have shown repeatable and consistent electrical outputs with Energy Conversion Efficiency an order of magnitude higher than those made of PVDF thin films. The early onset of the nonlinear domain wall motions behavior has been identified as one mechanism responsible for the apparent high piezoelectricity in nanofibers, rendering them potentially advantageous for sensing and actuation applications.

Chunmei Ding - One of the best experts on this subject based on the ideXlab platform.

  • integrating a redox flow battery into a z scheme water splitting system for enhancing the solar Energy Conversion Efficiency
    Energy and Environmental Science, 2019
    Co-Authors: Wangyin Wang, Shichao Liao, Mingyao Liu, Chunmei Ding
    Abstract:

    Photocatalytic Z-scheme water splitting is regarded as a promising approach for efficient Conversion of solar Energy into hydrogen. However, there is a considerable Energy loss during the electron transfer process between two photosystems. How to cut down the Energy loss becomes a critical issue for improving the solar Energy Conversion Efficiency. Herein, we analyze and evaluate the maximal room for Energy storage in photocatalytic water splitting systems and propose a strategy of integrating a redox flow battery (RFB) into a Z-scheme water splitting system to reduce the Energy loss. Moreover, we construct a biohybrid photosystem II (PSII)–ZrO2/TaON Z-scheme system with an integrated quinone/ferricyanide RFB. The platform system can generate both electricity and hydrogen utilizing solar Energy through photocatalytic charge and discharge processes of the RFB and the water splitting reaction, resulting in the enhancement of the solar Energy Conversion Efficiency. This proof-of-concept work opens a new avenue to save the Energy dissipated in Z-scheme water splitting for more efficient solar Energy Conversion.