Journal
ACS CATALYSIS
Volume 6, Issue 4, Pages 2416-2423Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b02924
Keywords
oxygen evolution; water oxidation; heterogeneous; catalysis; electrolysis; nickel-iron oxyhydroxide
Categories
Funding
- National Science Foundation [CHE-1301461, 0923577, 0421086]
- United States Air Force
- United States Air Force Academy faculty pipeline program
- W. M. Keck Foundation
- M. J. Murdock Charitable Trust
- ONAMI
- Air Force Research Laboratory
- University of Oregon
- Research Corporation for Science Advancement
- Sloan Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1301461] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0421086, 0923577] Funding Source: National Science Foundation
Ask authors/readers for more resources
Fe-doped Ni (oxy)hydroxide, Ni(Fe)OxHy, is one of the most-active oxygen-evolution-reaction (OER) catalysts in alkaline conditions, while Fe -free NiOxHy is a poor OER catalyst. One approach to better understand the role of Fe, and enable the design of catalysts with higher activities, is to find other cations that behave similarly and compare the common chemical features between them. Here we evaluate the effects of La, Mn, Ce, and Ti incorporation on the OER activity and redox behavior of NiOxHy in rigorously Fe -free alkaline solution using cyclic voltammetry and electrochemical quartz-crystal microgravimetry. We use X-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry to confirm that measurements are free from relevant levels of trace Fe contamination. We find that only Ce leads to increased activity in NiOxHy (about a factor of 10 enhancement), but this effect is transient, likely due to phase separation. We further find no clear correlation between activity and the nominal Ni2+/34 redox potential, suggesting that the oxidizing power of the Ni is not directly correlated with the OER activity. These findings suggest a uniqueness to Fe and are consistent with it being the active site in Ni(Fe)OxHy
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