Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation | Zendy

Khurram Saleem Joya | Zendy; Huub J. M. de Groot | Zendy

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Controlled Surface-Assembly of Nanoscale Leaf-Type Cu-Oxide Electrocatalyst for High Activity Water Oxidation

Author(s) -

Khurram Saleem Joya,

Huub J. M. de Groot

Publication year - 2016

Publication title -

acs catalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.898

H-Index - 198

ISSN - 2155-5435

DOI - 10.1021/acscatal.5b02950

Subject(s) - tafel equation , electrocatalyst , anodizing , oxide , copper , oxygen evolution , amorphous solid , materials science , catalysis , chemical engineering , water splitting , inorganic chemistry , chemistry , electrochemistry , metallurgy , electrode , crystallography , aluminium , biochemistry , photocatalysis , engineering

The controlled surface deposition of a robust and high-performance nanostructured copper-oxide (CuOx-NLs) electrocatalyst for water oxidation is presented. The material exhibits a characteristic leaf-type morphology and self-assembles on a copper substrate by straightforward constant-current anodization. The oxygen onset occurs at about 1.55 V versus RHE (η = 320 mV), which is 400–500 mV less than for amorphous Cu-oxide films. A Tafel slope of 44 mV dec–1 is obtained, which is the lowest observed relative to other copper-based materials. Long-term catalytic performance and stability tests of the electrocatalytic CuOx-NLs sample show a stable current density of >17 mA cm–2 for oxygen evolution, which was sustained for many hours.

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