Doping Graphene By Physisorption to Influence Electrochemical Activity and Probing Local Electrochemistry on 10 Micron Spots
Year: 2023
Type: conference-abstract
Abstract: Graphene as an electrochemical electrode for energy devices and catalytic activity is a catch 22 situation. Pristine graphene is highly conducting with exquisite chemical inertness to avoid poisoning of the electrode surface. However, this inertness leads to poor chemisorption which is generally considered a prerequisite for electron transfer during redox. Thus, pristine graphene is a poor electrochemical electrode. The challenge is being addressed by distorting the perfect sp2 structure by interfacing with other 2D materials to form (complex) heterostructures, and/or doping other atoms or punching holes (i.e., vacancies). However, chemical stability, i.e., inertness, becomes vulnerable at the defects. Here we propose a concept of “doping” where the graphene becomes electrochemically active, and the pristineness is maintained. The dopant is physiosorbed to the graphene. The outcome will be a redox active graphene electrode. DFT simulations are conducted to explain the structure. The electrochemical behavior will be studied by a special opto-electrochemical method called the Scanning electrometer for Electrical double-layer (SEED). SEED quantitively measures local electrochemistry on a 10-micron spot to avoid edge effect and (potential) cracks in graphene. Figure 1
Source: ECS Meeting Abstracts
Institutions: University of Nebraska–Lincoln, University of Göttingen
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4391639386