Evaluation of gas diffusion electrodes as detectors in amperometric hydrogen sensors

Abstract

This work is directed to the study and evaluation of gas diffusion electrodes as detectors in hydrogen sensors. Electrochemical experiments were carried out with rotating disk electrodes with a thin porous coating of the catalyst as a previous step to select useful parameters for the sensor. An experimental arrangement made in the laboratory that simulates the sensor was found appropriate to detect volumetric hydrogen percentages above 0.25% in mixtures H2:N2. The system shows a linear response for volumetric percentages of hydrogen between 0.25 and 2 %.

Electrocatalyst Characterization and Activity Validation – Fundamentals and Methods

“…Despite the significant progress, DMFCs still suffer from many obstacles such as low power density, which has been attributed to the poor kinetics of both anode [3], and cathode [4], high flux of water/methanol across membranes [5], and mixed potential at cathode [6]. The alloying of Pt with promoter metals such as Ru [13][14][15][16][17], Sn [18-22], Mo [23-25], W [26, 27], and Os [28, 29] has been explored as a promising route to minimize the effect of poisonous intermediates. Other important constraints are the high cost of noble metal catalysts and perfluorosulfonic membranes and higher production costs of the various components of the device.…”