SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Poster Session VI: Poster to Mini-Symposium: Electrified solid-liquid interfaces I
O 80.2: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Dodecanethiol on gold nanoparticles promotes catalytic performance by preventing trace ion deposition — •Hongyu Shang1, Spencer Wallentine1, Daniel Hofmann2, Quansong Zhu1, Catherine Murphy2, and Robert Baker1 — 1The Ohio State University, Columbus, Ohio, USA — 2University of Illinois: Urbana, IL, US
Nanoparticles are very efficient heterogeneous catalysts due to their inherent surface to volume ratio and tunability. Small organic molecules are usually used as capping agents to stabilize and control the size of the nanoparticles, which significantly affect the catalytic performance. To study the influence of capping agents in catalyzing carbon dioxide (CO2) to carbon monoxide (CO), we have performed carbon dioxide reduction (CDR) reaction on ultra-small (d=2nm) gold nanoparticles capped with different capping agents. We find that dodecanethiol on gold nanoparticles promotes catalytic selectivity and stability by inhibiting trace ion deposition that are responsible for rapid deactivation. Both the geometric structure and the microscopic ordering of the stabilization agent are found to influence the inhibition ability of the catalyst toward ion deposition. In addition, dodecanethiol capped gold nanoparticles exhibit a CO yield that is 100 times greater than polycrystalline gold when using ambient water source to prepare electrolyte. These findings give a better understanding in improving catalytic performance and provide a good opportunity to address the overlooked challenge of electrolyte purity.