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Mehmood, A.,An, M.,Ha, H.Y. Pergamon Press 2016 International journal of hydrogen energy Vol.41 No.46
<P>In this study, we demonstrate how the formulation of colloidal catalyst ink and fabrication conditions affect the cathode microstructure of catalyst coated membranes (CCMs) prepared via decal technique. The CCMs based on conventional and high concentration cathode inks are compared in a direct methanol fuel cell (DMFC). It is found that the cathode catalyst layer made with a high concentration ink possesses superior porosity, leading to an improved DMFC performance. The temperature of roll-press used for preparing CCM is varied ranging from 170 to 210 degrees C in order to determine the optimal fabrication conditions for high concentration ink-based cathode. The CCM hot-pressed at 200 degrees C (advanced CCM) retains a significantly higher pore volume and outperforms' the conventional CCM by delivering an excellent DMFC performance with a maximum power density of 155 mW cm(-2), which is 20% higher than that of the conventional CCM. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Rouhollah Khosroshahi,Nastaran A. Tehrani,Mozhdeh Forouzandeh,Fatemeh Behrouznejad,Nima Taghavinia,Mojtaba Bagherzadeh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
In this work, synthesis of CuIn0.75Ga0.25S2 (CIGS) nanoparticles, the formation of stable dispersion, depositionof high-quality films and, fabrication of thin-film Perovskite solar cells are reported. The stability ofnanoparticle ink is crucial in the formation of device-quality films. The chalcogenide-based materials arewidely used in thin-film solar cells; in particular, Cu(In,Ga)S2 are used as an absorber and hole transportinglayer. In the present study, the nanoparticles of about 20 nm size and bandgap of 1.5 eV are synthesizedusing a heat-up method. A variety of solvents are used as dispersing media and the stability of theinks is evaluated by precise optical monitoring. We observe a clear dependence of ink stability to thepolarity index of the solvent, where the best stability occurs at a polarity index of about 0.26–0.36, correspondingto a range of solvents including chloroform. The thin films that are spin-coated using CIGSchloroform ink show large cracks, presumably due to the high vapor pressure of chloroform andevaporation-induced stress in the film. We resolve this problem through low-temperature deposition,which resulted in highly uniform pin-hole and crack-free films. Finally, the optimum deposition conditionis used to fabricate perovskite solar cells having about 16.5% efficiency with CIGS as a hole transportlayer.