SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Poster Session V: Solid-liquid interfaces: Reactions and electrochemistry II
O 65.6: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Light assisted electrodeposition of Ni catalysts on p- doped Si(111) for photoelectrochemical water reduction — •David Ostheimer1, Mario Kurniawan2, Lara Eggert2, Thomas Hannappel1, and Andreas Bund2 — 1Fundamentals of Energy Materials, Ilmenau University of Technology, Germany — 2Electrochemistry and Electroplating, Ilmenau University of Technology, Germany
The development of efficient and inexpensive (photo-)electrocatalysts plays an important role to enhance the hydrogen evolution reaction for photoelectrochemical water-splitting. In the present work, nickel particles were electrochemically deposited on a p-type Si-(111) substrate under illumination. Different parameters have been varied to obtain beneficial morphologies and particle sizes. We show that they can be tailored by using either a potentiostatic method (resulting in large particles) or a galvanostatic deposition method (small particles), while the distribution of the particles on the surface is strongly influenced by the electrodeposition time. The particles size and the coverage including the surface roughness were investigated using atomic force microscopy. A relation between the surface morphology and catalytic activity was analyzed by comparing photocurrents of various samples. A dense particle coverage can block the incident light and thus limit the photoabsorption of the p-Si. This can be observed especially for samples with large catalyst particle sizes. Specimens with smaller nickel particles show a significant improvement of the photoactivity compared to samples with larger particles.