Student or educator? Sign up with your school email and get 6 months of Pro free.
CoChat
Sign Up
Cited by 220

The DOI matches its Crossref record.

Metal Oxide Catalysts for the Evolution of O2 from H2O

Merrill, Matthew D., Dougherty, Ralph C.·2008·The Journal of Physical Chemistry C
DOI 10.1021/jp710675m
Open this paper in CoChat — free account

Abstract

This paper describes an iron-nickel oxide catalyst that can eliminate oxygen overvoltage in the electrolysis of alkaline water. Oxygen overvoltage is the largest source of energy loss in water electrolysis. A method for cathodic electrodeposition of first-row transition metal oxides for use as catalysts is described, and the effects of the electrodeposition variables on catalytic performance and catalyst composition were explored. The NiFe oxide catalyst achieved a nearly ideal anodic electron-transfer coefficient, α a = 0.0082 (14.8 mV/decade) in a 1 M KOH solution. The metal oxide catalysts reported here could produce hydrogen and oxygen from water at approximately the thermodynamic potential for small currents. Both transmission electron microscopy and X-ray photoelectron spectroscopy experiments indicated that the NiFe oxide was composed of small crystals (∼1 nm) connected with an amorphous phase and contained a highly disordered arrangement of all nonmetallic nickel and iron oxidation states. Changes in electrochemical impedance spectra (EIS) with applied working potential correlated with known nickel and iron aqueous reduction potentials. A simple catalytic mechanism is presented. EIS showed a high-frequency inductive loop that spanned 3 log of frequency (>10 5 to ∼10 2 Hz) and exhibited both negative capacitance and negative resistance. A scan of electrode material (scraped from the electrode) magnetization as a function of applied magnetic field using a SQUID magnetometer showed the NiFe oxide electrode to have magnetically ordered domains within its structure and to have a magnetization at zero-applied field. Magnetic fields associated with these domains are related to the efficient production of the oxygen triplet state with the electrode. These fields are also responsible for the fact that the oxygen-evolving electrode will not produce a cyclic voltammogram but rather gives an oscillating signal indicating charge rearrangement under those conditions.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1021/jp710675m

Cites

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cited by

Metadata

Authors
Merrill, M. D., & Dougherty, R. C.
Venue
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Published
2008-02-14
Volume
112
Issue
10
Pages
3655-3666
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
DOI
10.1021/jp710675m
OpenAlex
W1985579356
Cited by
220
References
0
FWCI
3.40
Type
journal article
Language
en
Open access
closed

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.