A transition metal oxofluoride offering advantages in electrocatalysis and potential use in applications

The recently described solid solution (Co,Ni,Mn) 3 Sb 4 O 6 F 6 has proved stable and efficient as a catalyst for electrocatalytic water oxidation. The end component Co 3 Sb 4 O 6 F 6 was found to be most efficient, maintaining a current density of j = 10 mA cm −2 at an overpotential of 443 mV with...

Full description

Saved in:
Bibliographic Details
Published in:Faraday discussions 2016-01, Vol.188, p.481-498
Main Authors: Svengren, H, Torapava, N, Athanassiadis, I, Ali, S. I, Johnsson, M
Format: Article
Language:English
Subjects:
Catalysts
Crystallites
Current density
Electrocatalysis
Electrolytes
Inorganic Chemistry
oorganisk kemi
Pathways
Solid solutions
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The recently described solid solution (Co,Ni,Mn) 3 Sb 4 O 6 F 6 has proved stable and efficient as a catalyst for electrocatalytic water oxidation. The end component Co 3 Sb 4 O 6 F 6 was found to be most efficient, maintaining a current density of j = 10 mA cm −2 at an overpotential of 443 mV with good capability. At this current density, O 2 and H 2 were produced in the ratio 1 : 2 without loss of faradaic current against a Pt-cathode. A morphological change in the crystallite surface was observed after 0.5 h, however, even after 64.5 h, the overall shape and size of the small crystallites were unaffected and the electrolyte contained only 0.02 at% Co. It was also possible to conclude from in situ EXAFS measurements that the coordination around Co did not change. The oxofluorides express both hydrophilic and hydrophobic surface sites, incorporate a flexible metalloid element and offer the possibility of a mechanism that differs from other inorganic catalytic pathways previously described.
ISSN:1359-6640
1364-5498
1364-5498
DOI:10.1039/c5fd00169b