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Fan L.,Tianjin University | Zhang G.,Tianjin University | Wang R.,Tianjin University | Wang R.,Dalian Sunrise Power Co. | Jiao K.,Tianjin University
Energy Conversion and Management | Year: 2016

A comprehensive mathematical model is proposed to calculate the optimal leg length and cross-section area of TEG unit to maximize the peak output power. The model shows that for a TEG unit, there exists an optimal ratio of leg length and leg cross-section area corresponding to the maximum peak output power with a convective thermal boundary condition, and the optimal leg length and cross-section area can be further calculated based on the optimal ratio. The mathematical model is also validated in this paper, and the corresponding error is within a reasonable range. Moreover, the effects of the leg length and leg area on the peak output power, the peak output power density and the efficiency of TEG unit with different thermal boundary conditions are also discussed. This study will provide guidance for the structure design optimization of TEG unit. © 2016 Elsevier Ltd. All rights reserved. Source


Zhao Y.,CAS Dalian Institute of Chemical Physics | Zhao Y.,University of Chinese Academy of Sciences | Yu H.,CAS Dalian Institute of Chemical Physics | Xing D.,Dalian Sunrise Power Co. | And 4 more authors.
Journal of Membrane Science | Year: 2012

In this paper, we report on the preparation of a novel type of PTFE based composite anion exchange membrane for alkaline fuel cells by a low-toxic and facile processing route. The membranes were synthesized by in-situ polymerization of a N-vinylformamide monomer in the PTFE matrix, followed by hydrolysis in sodium hydroxide aqueous solution and quaternary amination with iodomethane-ethanol solution. The method for anion exchange membrane synthesis is facile, low-toxic and does not involve the use of carcinogenic chemical such as chloromethylmethylether and trimethylamine. The membranes were characterized via Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Water uptake, ionic exchange capacity, tensile strength and conductivity have also been investigated to evaluate the performance in alkaline fuel cell. The results showed that the membranes exhibited high ionic exchange capacity, as well as good mechanical, chemical and thermal stabilities. © 2012 Elsevier B.V. Source


Dou M.,CAS Dalian Institute of Chemical Physics | Dou M.,University of Chinese Academy of Sciences | Hou M.,CAS Dalian Institute of Chemical Physics | Liang D.,Dalian Sunrise Power Co. | And 4 more authors.
Electrochimica Acta | Year: 2013

Tin oxide nanocluster (SnO2) with parallel nanorods was synthesized via a hard template method and explored as the anode catalyst support for proton exchange membrane fuel cells (PEMFCs). Single cell test demonstrated that SnO2 supported Pt catalyst (Pt/SnO2) exhibited comparable anode performance with conventional Pt/C. Electrochemical measurements showed that Pt/SnO2 exhibited significantly enhanced electrochemical stability than Pt/C under high potential electro-oxidation and potential cycling. The Pt/SnO2 catalyst reserved most of its electrochemically active surface area (ECA) under 10 h potential hold at 1.6 V while its ECA degradation rate was one order of magnitude lower than Pt/C under potential cycling between 0.6 and 1.2 V. Therefore, SnO2 nanocluster can be considered as a promising alternative anode catalyst support for PEMFCs. © 2013 Elsevier Ltd. Source


Yu J.,Dalian University of Technology | Jiang Z.,Dalian University of Technology | Hou M.,CAS Dalian Institute of Chemical Physics | Liang D.,Dalian Sunrise Power Co. | And 5 more authors.
Journal of Power Sources | Year: 2014

Proton exchange membrane fuel cells (PEMFCs) with a dead-ended anode (DEA) can obtain high hydrogen utilization by a comparatively simple system. Nevertheless, the accumulation of the nitrogen and the water in the anode channels can lead to a local fuel starvation, which degrades the performance and durability of PEMFCs. In this paper, the behaviors of PEMFCs with a DEA are explored experimentally by detecting the current distribution and the local potentials. The results indicate that the current distribution is uneven during the DEA operation. The local current firstly decreases at the region near the anode outlet, and then extends to the inlet region along the channels with time. The complete fuel starvation near the anode outlet leads to a high local potential and carbon corrosion on the cathode side. The SEM images of the cathode electrode reveal that the significant thickness reduction and the collapse of the electrode's porous structure happen in the cathode catalyst layer, leading to the irreversible decline of the performance. The comparison of the experiments with different oxidants and fuels reveals that the nitrogen crossover from cathode to anode is the dominant factor on the performance decline under the DEA operations. © 2013 Elsevier B.V. All rights reserved. Source


Zhang H.,CAS Dalian Institute of Chemical Physics | Zhang H.,University of Chinese Academy of Sciences | Lin G.,Dalian University of Technology | Hou M.,CAS Dalian Institute of Chemical Physics | And 5 more authors.
Journal of Power Sources | Year: 2012

CrN/Cr multilayer coating is prepared on 316L stainless steel as bipolar plates for proton exchange membrane fuel cell (PEMFC) by pulsed bias arc ion plating (PBAIP). Interfacial conductivity of the bipolar plate with CrN/Cr multilayer is improved obviously, presenting an interfacial contact resistance (ICR) of 8.4 mω cm?2 under 1.4 MPa. The results tested by potentiodynamic and potentiostatic measures in simulated PEMFC environments show that the bipolar plate with CrN/Cr multilayer has good anticorrosion performance. The corrosion current density of the bipolar plate with CrN/Cr multilayer is approximately 10?8.0 A cm?2 at 0.6 V (vs. SCE) in a 0.5 M H2SO4 + 5 ppm F- solution at 70 °C with pressured air purging. The results of SEM and ICR before and after corrosion tests indicate that the bipolar plate with CrN/Cr multilayer is considerably stable electrochemically. The bipolar plate with CrN/Cr multilayer combined the prominent interfacial conductivity and the excellent corrosion resistance, showing great potential of application in PEMFC. © 2011 Elsevier B.V. All rights reserved. Source

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