(Invited) Electrochemical Processing of Metal-Insulator-Semiconductor (MIS) Photoelectrodes
In this work, we have systematically investigated electrodeposition of Pt nanoparticle collectors on SiO2-covered p-Si(100) MIS photoelectrodes, with the goal of obtaining a high degree of control of nanoparticle coverage, catalytic surface area, and nanoparticle size. These three parameters strongly influence photoelectrode optical, catalytic, and photovoltage performance, respectively, and electrodeposition offers an exciting opportunity to optimize these properties. This work has studied the influence of key deposition parameters (potential, current density, surface treatment) on the physical properties of the Pt nanoparticles, as well as the resulting PEC performance for photo-driven hydrogen evolution reaction (HER). Through systematic investigation of the structure-property relationships in this MIS photoelectrode system, this study deconvolutes the optical, electronic, and catalytic influences of Pt nanoparticle geometries on photoelectrode performance. Such loss analysis is highly useful for guiding the design of more efficient photoelectrodes. Finally, opportunities and challenges of utilizing electrochemical processing for the manufacture of efficient photoelectrodes are discussed.
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