NDLI: The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

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The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

Content Provider	MDPI
Author	Adiga, Prajwal Doi, Nathan Wong, Cindy Santosa, Daniel M. Kuo, Li-Jung Gill, Gary A. Silverstein, Joshua A. Avalos, Nancy M. Crum, Jarrod V. Engelhard, Mark H. Stoerzinger, Kelsey A. Asmussen, Robert Matthew
Copyright Year	2021
Description	Electrocatalytic water splitting is a possible route to the expanded generation of green hydrogen; however, a long-term challenge is the requirement of fresh water as an electrolyzer feed. The use of seawater as a direct feed for electrolytic hydrogen production would alleviate fresh water needs and potentially open an avenue for locally generated hydrogen from marine hydrokinetic or off-shore power sources. One environmental limitation to seawater electrolysis is the generation of chlorine as a competitive anodic reaction. This work evaluates transition metal (W, Co, Fe, Sn, and Ru) doping of Mn-Mo-based catalysts as a strategy to suppress chlorine evolution while sustaining catalytic efficiency. Electrochemical evaluations in neutral chloride solution and raw seawater showed the promise of a novel Mn-Mo-Ru electrode system for oxygen evolution efficiency and enhanced catalytic activity. Subsequent stability testing in a flowing raw seawater flume highlighted the need for improved catalyst stability for long-term applications of Mn-Mo-Ru catalysts. This work highlights that elements known to be selective toward chlorine evolution in simple oxide form (e.g., $RuO_{2}$) may display different trends in selectivity when used as isolated dopants, where Ru suppressed chlorine evolution in Mn-based catalysts.
Starting Page	11911
e-ISSN	20763417
DOI	10.3390/app112411911
Journal	Applied Sciences
Issue Number	24
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-12-15
Access Restriction	Open
Subject Keyword	Applied Sciences Environmental Engineering Electrolysis Chlorine Evolution Oxygen Evolution Seawater
Content Type	Text
Resource Type	Article

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