Journal
SMALL
Volume 19, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202206918
Keywords
chlorine evolution reaction; linear scaling relationship; nanoscopic channels; oxygen evolution reaction; seawater splitting
Ask authors/readers for more resources
By utilizing nanochanneled RuO2 catalyst, the activity of oxygen evolution reaction (OER) is significantly improved, leading to enhanced hydrogen production in seawater electrolysis.
Abundant availability of seawater grants economic and resource-rich benefits to water electrolysis technology requiring high-purity water if undesired reactions such as chlorine evolution reaction (CER) competitive to oxygen evolution reaction (OER) are suppressed. Inspired by a conceptual computational work suggesting that OER is kinetically improved via a double activation within 7 angstrom-gap nanochannels, RuO2 catalysts are realized to have nanoscopic channels at 7, 11, and 14 angstrom gap in average (d(gap)), and preferential activity improvement of OER over CER in seawater by using nanochanneled RuO2 is demonstrated. When the channels are developed to have 7 angstrom gap, the OER current is maximized with the overpotential required for triggering OER minimized. The gap value guaranteeing the highest OER activity is identical to the value expected from the computational work. The improved OER activity significantly increases the selectivity of OER over CER in seawater since the double activation by the 7 angstrom-nanoconfined environments to allow an OER intermediate (*OOH) to be doubly anchored to Ru and O active sites does not work on the CER intermediate (*Cl). Successful operation of direct seawater electrolysis with improved hydrogen production is demonstrated by employing the 7 angstrom-nanochanneled RuO2 as the OER electrocatalyst.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available