Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 34, Pages 28355-28365Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05735
Keywords
oxygen evolution reaction (OER); superhydrophilicity; superaerophobicity; nickel cobalt hydroxide; water splitting; amorphous; nanodendrite
Funding
- National Science Foundation (NSF) [1439494, 1444473]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1444473] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1439494] Funding Source: National Science Foundation
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We demonstrate an electrodeposition method to rapidly grow novel three-dimensional nanodendrite forests of amorphous alpha-phase mixed nickel-cobalt hydroxides on stainless steel foil toward high performance electrocatalysis of the oxygen evolution reaction (OER). The proposed hydrogen bubble-templated, diffusion-limited deposition process leads to the unprecedented dendritic growth of vertically aligned amorphous metal hydroxides, induced by the controlled electrolysis of the tuned water content in the primarily alcohol-based deposition solution. The hierarchical nature of these binder-free, amorphous metal hydroxide deposits leads to their superhydrophilic nature and underwater superaerophobic behavior. The combination of all of these qualities leads to exemplary catalytic performance. When directly grown on planar stainless steel substrates, these nanoforests show high OER activity with overpotentials as low as similar to 255 mV to produce a current density of 10 mA cm(-2) over 10 000 accelerated stability test cycles. This work demonstrates a novel fabrication technique that can simultaneously achieve a dendritic hierarchical structure, vertical alignment, superaerophobicity, amorphous crystal structure, and intimate contact with the substrate that leads to high catalytic activity with excellent durability.
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