Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 1, Pages 945-951Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10634
Keywords
water oxidation; oxygen evolution; carbon nanotube; nickel-cobalt silicate hydroxide; electrocatalyst
Funding
- National Natural Science Foundation of China [51572227, 21207108]
- Sichuan Youth Science and Technology Foundation [2013JQ0012]
- Research Foundation of CWNU [14E016]
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Developing robust earth-abundant electrocatalysts for oxygen evolution reaction (OER) is an ongoing scientific challenge, which is coupled with a number of important electrochemical processes and many key renewable energy systems, such as water splitting, rechargeable metal-air batteries, and regenerative fuel cells. Here, we proposed a rational design and fabrication of the synergetic coaxial nanocable structures by intimate growth of the layered nickel-cobalt silicate hydroxide nanosheets on the outer surfaces of multiwalled carbon nanotubes (MWCNTs@NCS) and demonstrated their high efficiency in electrocatalytic OER from water splitting. The electrocatalytic activities of the MWCNTs@NCS were found to be significantly higher than that of bare NCS and pristine MWCNTs, synergetically determining by such the constituted individual components. Among them, the MWCNTs@NCS-2 exhibited best electrocatalytic OER performance, showing a small OER onset potential, large anodic current and long-term durability, which was favorably comparable to the previously reported NiCo-based OER electrocatalysts in alkaline electrolytes. To the best of our knowledge, this was a first example on the earth-abundant metal silicate hydroxides utilized in electrochemical water splitting.
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