Journal
ADVANCED MATERIALS
Volume 30, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705366
Keywords
Co(OH)(2) nanoparticles; conductive nanowire arrays; encapsulation; room-temperature anodization; water oxidation
Categories
Funding
- National Key Scientific Instrument and Equipment Development Project of China [21627809]
- Taishan Scholar Foundation of Shandong Province [ts20130937]
- National Natural Science Foundation of China [21575137, 21575050, 21775054]
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It is highly desired but still remains challenging to design and develop a Co-based nanoparticle-encapsulated conductive nanoarray at room temperature for high-performance water oxidation electrocatalysis. Here, it is reported that room-temperature anodization of a Co(TCNQ)(2) (TCNQ = tetracyanoquinodimethane) nanowire array on copper foam at alkaline pH leads to in situ electrochemcial oxidation of TCNQ(-) into water-insoluable TCNQ nanoarray embedding Co(OH)(2) nanoparticles. Such Co(OH)(2)-TCNQ/CF shows superior catalytic activity for water oxidation and demands only a low overpotential of 276 mV to drive a geometrical current density of 25 mA cm(-2) in 1.0 m KOH. Notably, it also demonstrates strong long-term electrochemical durability with its activity being retrained for at least 25 h, a high turnover frequency of 0.97 s(-1) at an overpotential of 450 mV and 100% Faradic efficiency. This study provides an exciting new method for the rational design and development of a conductive TCNQ-based nanoarray as an interesting 3D material for advanced electrochemical applications.
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