| Hydrogen is a clean and efficient energy carrier, and its renewable and energydensity advantages make it in the near future will be widely used. It is imminent todevelop an efficient pathway for the preparation and use of hydrogen energy. Polymerelectrolyte membrane (PEM) water electrolysis due to its stable efficiency and safeand reliable performance is considered to be a promising method for hydrogenproduction. At present, high activity and stability of anode catalyst materialpreparation to become the focus of PEM water electrolysis, this is because the anodicoxygen evolution reaction (OER) and the dynamic process are slow, resulting inwater electrolysis process required the highest potential.In this study, take antimony doped tin oxide (ATO) as the carrier, a new waterelectrolysis anode catalyst IrO2/ATO was prepared by a low-cost method of simplesystem, and its properties were characterized. The crystal structure and surfaceelement were characterized by SEM, TEM, XRD and XPS methods to analyse thesurface morphology of the catalyst material. The electrochemical catalyst materialson the electrocatalyts oxygen evolution activity and stability were investigated by themeasurement method of cyclic voltammetry, polarization curves, electrochemicalimpedance and chronoamperometry, and the influences of heat treatment temperatureon the structure and properties. The preparation method has simple steps, theoperating conditions of conventional, low requirement on equipment. The methodallows a single batch preparation of catalyst materials and does not produce anyharmful gases. It was found out that the IrO2/ATO material has good electrochemicalcatalytic property of oxygen evolution, and can keep the good stability in acidmedium and high overpotential for oxygen evolution. Heat treatment has a significanteffect on the structure and composition of the surface temperature and the valence ofelements for the catalyst, therefore the electrochemical catalytic oxygen evolutionactivity was also different with the different heat treatment temperature. Above all,the400C heated treated catalyst performed best, it got a current density of105mA·cm-2at1.6V. Its stability toward Oxygen evolution reaction (OER) in acidicmedia was tested at1.5V, and the current density decaying rate was1.687×10-2(mA·cm-2)·h-1.MEA is the core of the PEM water electrolysis technology, the traditionalcatalytic layer of catalyst particles and the polymer binder dispersion random, unavoidable catalyst utilization loss and mass transfer resistance of catalyst layer wasgreatly. Bsaed on the research of the traditional structure of PEM water electrolysiscatalytic layer, in order to reduce the mass transfer resistance and increase theutilization of the catalyst, the catalytic layer structured by electric field was obtained,and has carried on the test of PEM water electrolysis. Found by electrochemicalimpedance spectroscopy study of catalyst layer, ohm impedance can be reduced bythe AC field in the PEM water electrolysis reaction, and the frequency of the AC fieldalso has some influence. |
