Abstract
Oxygen evolution reactions (OER) are important reactions for energy conversion. Metal-free carbon-based catalysts potentially contribute to the catalytic materials for OER. However, it has been difficult to understand the intrinsic catalytic activity of carbon materials, due to catalyst decomposition over the course of long-term reactions. Here, we report high oxygen evolution reaction catalytic activity of F-doped carbon in alkaline media. Intrinsic OER activity was evaluated from a combination of measurements using a rotating disk electrode and O2 sensor. The F-doped carbon catalyst is a highly active catalyst, comparable to state-of-the-art precious-metal-based catalysts such as RuO2.
Highlights
The oxygen evolution reaction (OER) in water splitting reactions is an important reaction for energy conversion and storage [1]
We recently reported that semi-ionic C–F bonds in fluorine-doped carbon (F–carbon) enhance the catalysis for OER in alkaline media [4]
We demonstrated that pristine carbon materials show negligible evolution rates compared to the observed current density that comes from the the activity of oxygen evolution rates compared to the observed current density
Summary
The oxygen evolution reaction (OER) in water splitting reactions is an important reaction for energy conversion and storage [1]. O2 detection methods in solution could be a candidate for the evaluation of OER catalytic activity even for carbon materials. We report high catalytic activity for our F–carbon, as evaluated based on electrode kinetics. This analytical method is based on the combination of measurement of faradic current using a rotating disk electrode (RDE), and detection of evolved O2 by fluorescent sensor, which is placed in the electrolyte and close to the catalyst. We constructed a kinetic model of the OER reaction by analysis of in situ monitoring of O2 concentration. This methodology revealed that our F–carbon catalyst is comparable to the precious metal oxide
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
