Abstract:
:Commercial hydrogen production by electrocatalytic water splitting will benefit from the realization of more efficient and less expensive catalysts compared with noble metal catalysts, especially for the oxygen evolution reaction, which requires a current density of 500 mA/cm2 at an overpotential below 300 mV with long-term stability. Here we report a robust oxygen-evolving electrocatalyst consisting of ferrous metaphosphate on self-supported conductive nickel foam that is commercially available in large scale. We find that this catalyst, which may be associated with the in situ generated nickel-iron oxide/hydroxide and iron oxyhydroxide catalysts at the surface, yields current densities of 10 mA/cm2 at an overpotential of 177 mV, 500 mA/cm2 at only 265 mV, and 1,705 mA/cm2 at 300 mV, with high durability in alkaline electrolyte of 1 M KOH even after 10,000 cycles, representing activity enhancement by a factor of 49 in boosting water oxidation at 300 mV relative to the state-of-the-art IrO2 catalyst.
journal_name
Proc Natl Acad Sci U S Aauthors
Zhou H,Yu F,Sun J,He R,Chen S,Chu CW,Ren Zdoi
10.1073/pnas.1701562114subject
Has Abstractpub_date
2017-05-30 00:00:00pages
5607-5611issue
22eissn
0027-8424issn
1091-6490pii
1701562114journal_volume
114pub_type
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