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Sn/PANI/p-Si/Al heterojunctions were fabricated by electropolymerization of aniline on chemically cleaned p-Si substrates. Current-voltage characteristics of Sn/PANI/p-Si/Al heterojunctions measured in the temperature range 140-280 K are presented and analyzed. Although these devices were clearly rectifying, their I-V characteristics were non-ideal, which can be judged from the nonlinearity in the semi-logarithmic plots. The high values of the ideality factor n depending on the sample temperature may be ascribed to a decrease of the exponentially increasing rate in current due to space-charge injection into the PANI thin film at higher forward bias voltages. Careful analysis of the forward bias I-V characteristics on a log-log scale indicates that the space-charge-limited current (SCLC) conduction controlled by an exponential trap distribution above the valence band edge dominates the current transport in the PANI/p-Si diodes at high voltages. Furthermore, the PANI was characterized by using Fourier transform infrared (FTIR) and ultraviolet-visible (UV-vis) spectra.

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One of the hydrogen production methods, namely the proton exchange membrane water electrolyzer (PEMWE), shows good potential and agreement with renewable energy sources in the storage and conversion of energy. In this study, the effects of different anode catalyst materials on the performance of PEMWE are investigated. In line with this aim the temperature, membrane thickness, current collector length and molar fraction distribution of species in gas channels are investigated to observe and compare the effects of different anode catalyst. The cell performance is simulated with a two dimensional numerical model based on Comsol Multiphysics Software. The performance of the cell and hydrogen production are increased with the change of temperature from 303 K to 353 K. Different thickness of the membrane is investigated and the results bring out that use of thinner membrane is more important for Pt‐Ir anode catalyst than Pt anode catalyst. Additionally, Pt‐Ir anode catalyst is decreased cell voltage and provided four times higher current density. Maximum value of hydrogen molar fraction in the cathode gas channel is increased 60%.

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