3D self-supported FeOP film on nickel foam as a highly active bifunctional electrocatalyst for urea-assisted overall water splitting

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.12.001· OSTI ID:22803899

Li, Yuanjian; Wang, Huanwen; Wang, Rui; He, Beibei; Gong, Yansheng ^[1]

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1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074 (China)

Highlights: • ALD FeO{sub x} is firstly used to synthesize the amorphous FeOP composite. • The urea oxidation (UOR) is used for Ienergy-intensive hydrogen production. • Highly porous carbon layer is tightly connected with conductive graphene sheets. • High UOR activity with a low potential of 1.34 V (vs. RHE) at 10 mA cm{sup −2}. • The superior bifunctional activity of the FeOP/NF for water-splitting. - Abstract: Replacement of oxygen evolution (OER) by the more readily oxidized urea is considered to be a promising strategy for electrocatalytic water-splitting. In this work, we report a FeOP film on nickel foam (FeOP/NF) via atomic layer deposition (ALD) of iron oxide and a subsequent phosphonation process, which acts as a superior bifunctional electrocatalyst for both urea evolution reaction (UOR) and hydrogen evolution reaction (HER). Benefiting from the synergetic effects, the FeOP/NF exhibits a low potential of 1.34 V (vs. RHE) at 10 mA cm{sup −2} and a low Tafel slope of 57.2 mV dec{sup −1} for UOR. Combined with the high HER activity of FeOP/NF, the urea-based overall water splitting can be performed with an low voltage of 1.43 V to deliver 10 mA cm{sup −2} in 1.0 M KOH with 0.5 M urea, which is 200 mV lower than that for pure water splitting.

• OSTI ID: 22803899
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 100; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEPOSITION
ELECTRIC POTENTIAL
ELECTROCATALYSTS
FOAMS
GRAPHENE
HYDROGEN PRODUCTION
IRON OXIDES
NICKEL
OXIDATION
OXYGEN
PHOSPHIDES
POROUS MATERIALS
POTASSIUM HYDROXIDES
SHEETS
THIN FILMS
UREA