共查询到20条相似文献,搜索用时 15 毫秒
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Controllable fabrication of compositionally graded Gd0.1Ce0.9O2‐δ and Y0.16Zr0.84O2‐δ electrolytes using co‐sputtering is demonstrated. Self‐supported membranes were lithographically fabricated to employ the new electrolytes into thin film solid oxide fuel cells. Devices integrating such electrolytes demonstrate performance of over 1175 mW cm?2 and 665 mW cm?2 at 520 °C using hydrogen and methane as fuel, respectively. The results present a general strategy to fabricate nanoscale functionally graded materials with selective interfacial functionality for energy conversion. 相似文献
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Low‐Temperature Micro‐Solid Oxide Fuel Cells with Partially Amorphous La0.6Sr0.4CoO3‐δ Cathodes 下载免费PDF全文
Anna Evans Julia Martynczuk Dieter Stender Christof W. Schneider Thomas Lippert Michel Prestat 《Liver Transplantation》2015,5(1)
Partially amorphous La0.6Sr0.4CoO3‐δ (LSC) thin‐film cathodes are fabricated using pulsed laser deposition and are integrated in free‐standing micro‐solid oxide fuel cells (micro‐SOFC) with a 3YSZ electrolyte and a Pt anode. A low degree of crystallinity of the LSC layers is achieved by taking advantage of the miniaturization of the cells, which permits low‐temperature operation (300–450 °C). Thermomechanically stable micro‐SOFC are obtained with strongly buckled electrolyte membranes. The nanoporous columnar microstructure of the LSC layers provides a large surface area for oxygen incorporation and is also believed to reduce the amount of stress at the cathode/electrolyte interface. With a high rate of failure‐free micro‐SOFC membranes, it is possible to avoid gas cross‐over and open‐circuit voltages of 1.06 V are attained. First power densities as high as 200–262 mW cm?2 at 400–450 °C are achieved. The area‐specific resistance of the oxygen reduction reaction is lower than 0.3 Ω cm2 at 400 °C around the peak power density. These outstanding findings demonstrate that partially amorphous oxides are promising electrode candidates for the next‐generation of solid oxide fuel cells working at low‐temperatures. 相似文献
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Thin‐Film Solar Cells: Atomic‐Scale Observation of Oxygen Substitution and Its Correlation with Hole‐Transport Barriers in Cu2ZnSnSe4 Thin‐Film Solar Cells (Adv. Energy Mater. 6/2016) 下载免费PDF全文
Jin Hyun Kim Si‐Young Choi Minseok Choi Talia Gershon Yun Seog Lee Wei Wang Byungha Shin Sung‐Yoon Chung 《Liver Transplantation》2016,6(6)
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Solid Electrolytes: Fabrication of Sub‐Micrometer‐Thick Solid Electrolyte Membranes of β‐Li3PS4 via Tiled Assembly of Nanoscale,Plate‐Like Building Blocks (Adv. Energy Mater. 21/2018) 下载免费PDF全文
Zachary D. Hood Hui Wang Amaresh Samuthira Pandian Rui Peng Kyle D. Gilroy Miaofang Chi Chengdu Liang Younan Xia 《Liver Transplantation》2018,8(21)
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Fuel Cells: Cerium Oxide Decorated Polymer Nanofibers as Effective Membrane Reinforcement for Durable,High‐Performance Fuel Cells (Adv. Energy Mater. 6/2017) 下载免费PDF全文
Matthias Breitwieser Carolin Klose Armin Hartmann Andreas Büchler Matthias Klingele Severin Vierrath Roland Zengerle Simon Thiele 《Liver Transplantation》2017,7(6)
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Exceptionally Enhanced Electrode Activity of (Pr,Ce)O2−δ‐Based Cathodes for Thin‐Film Solid Oxide Fuel Cells 下载免费PDF全文
It is shown that an electrochemically‐driven oxide overcoating substantially improves the performance of metal electrodes in high‐temperature electrochemical applications. As a case study, Pt thin films are overcoated with (Pr,Ce)O2?δ (PCO) by means of a cathodic electrochemical deposition process that produces nanostructured oxide layers with a high specific surface area and uniform metal coverage and then the coated films are examined as an O2‐electrode for thin‐film‐based solid oxide fuel cells. The combination of excellent conductivity, reactivity, and durability of PCO dramatically improves the oxygen reduction reaction rate while maintaining the nanoscale architecture of PCO layers and thus the performance of the PCO‐coated Pt thin‐film electrodes at high temperatures. As a result, with an oxide coating step lasting only 5 min, the electrode resistance is successfully reduced by more than 1000 times at 500 °C in air. These observations provide a new direction for the design of high‐performance electrodes for high‐temperature electrochemical cells. 相似文献
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Rizwan Raza Haiying Qin Qinghua Liu Mahrokh Samavati Raquel. B. Lima Bin Zhu 《Liver Transplantation》2011,1(6):1225-1233
An advanced multifuelled solid oxide fuel cell (ASOFC) with a functional nanocomposite was developed and tested for use in a polygeneration system. Several different types of fuel, for example, gaseous (hydrogen and biogas) and liquid fuels (bio‐ethanol and bio‐methanol), were used in the experiments. Maximum power densities of 1000, 300, 600, 550 mW cm?2 were achieved using hydrogen, bio‐gas, bio‐methanol, and bio‐ethanol, respectively, in the ASOFC. Electrical and total efficiencies of 54% and 80% were achieved using the single cell with hydrogen fuel. These results show that the use of a multi‐fuelled system for polygeneration is a promising means of generating sustainable power. 相似文献
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High‐Performance Silver Cathode Surface Treated with Scandia‐Stabilized Zirconia Nanoparticles for Intermediate Temperature Solid Oxide Fuel Cells 下载免费PDF全文
Hyung Jong Choi Manjin Kim Ke Chean Neoh Dong Young Jang Hyun Joong Kim Jong Mok Shin Gyu‐Tae Kim Joon Hyung Shim 《Liver Transplantation》2017,7(4)
This work introduces a novel silver composite cathode with a surface coating of scandia‐stabilized zirconia (ScSZ) nanoparticles for application in intermediate temperature solid oxide fuel cells (IT‐SOFCs). The ScSZ coating is expected to maximize the triple boundary area of the Ag electrode, ScSZ electrolyte, and oxygen gas, where the oxygen reduction reaction occurs. The coating also protects the porous Ag against thermal agglomeration during fuel cell operation. The ScSZ nanoparticles are prepared by sputtering scandium‐zirconium alloy followed by thermal oxidation on Ag mesh. The performance of the solid oxide fuel cells with a gadolinia‐doped ceria electrolyte support is evaluated. At temperatures <500 °C, our optimized Ag‐ScSZ cathode outperforms the bare Ag cathode and even the platinum cathode, which has been believed to be the best material for this purpose. The highest cell peak power with the Ag‐ScSZ cathode is close to 60 mW cm?2 at 450 °C, while bare Ag and optimized Pt cathodes produce 38.3 and 49.4 mW cm?2, respectively. Long‐term current measurement also confirms that the Ag‐ScSZ cathode is thermally stable, with less degradation than bare Ag or Pt. 相似文献
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BaZr0.7Sn0.1Y0.2O3–δ (BZSY) is developed as a novel chemically stable proton conductor for solid oxide fuel cells (SOFCs). BZSY possesses the same cubic symmetry of space group Pm‐3m with BaZr0.8Y0.2O3‐δ (BZY). Thermogravimetric analysis (TGA) and X‐ray photoelectron spectra (XPS) results reveal that BZSY exhibits remarkably enhanced hydration ability compared to BZY. Correspondingly, BZSY shows significantly improved electrical conductivity. The chemical stability test shows that BZSY is quite stable under atmospheres containing CO2 or H2O. Fully dense BZSY electrolyte films are successfully fabricated on NiO–BZSY anode substrates followed by co‐firing at 1400 °C for 5 h and the film exhibits excellent electrical conductivity under fuel cell conditions. The single cell with a 12‐μm‐thick BZSY electrolyte film outputs by far the best performance for acceptor‐doped BaZrO3‐based SOFCs. With wet hydrogen (3% H2O) as the fuel and static air as the oxidant, the peak power density of the cell achieves as high as 360 mWcm?2 at 700 °C, an increase of 42% compared to the reported highest performance of BaZrO3‐based cells. The encouraging results demonstrate that BZSY is a good candidate as the electrolyte material for next generation high performance proton‐conducting SOFCs. 相似文献
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Solar Cells: Device Architectures for Enhanced Photon Recycling in Thin‐Film Multijunction Solar Cells (Adv. Energy Mater. 1/2015) 下载免费PDF全文
Xing Sheng Myoung Hee Yun Chen Zhang Ala'a M. Al‐Okaily Maria Masouraki Ling Shen Shuodao Wang William L. Wilson Jin Young Kim Placid Ferreira Xiuling Li Eli Yablonovitch John A. Rogers 《Liver Transplantation》2015,5(1)
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Lithium‐Ion Batteries: Flexible Composite Solid Electrolyte Facilitating Highly Stable “Soft Contacting” Li–Electrolyte Interface for Solid State Lithium‐Ion Batteries (Adv. Energy Mater. 22/2017) 下载免费PDF全文
Luyi Yang Zijian Wang Yancong Feng Rui Tan Yunxing Zuo Rongtan Gao Yan Zhao Lei Han Ziqi Wang Feng Pan 《Liver Transplantation》2017,7(22)