Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 14, Pages 11678-11688Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00240
Keywords
g-C3N4 template; oxygen-modified nitrogen-doped carbon nanosheets; multifunctional electrocatalysis; Zn-air batteries; water-splitting cells
Funding
- National Natural Science Foundation of China [21335004, 21673111]
- International Cooperation Foundation from Ministry of Science and Technology [2016YFE0130100]
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Designing and synthesizing nanomaterials with high coverages of active sites is one of the most-pivotal factors in the construction of state-of-the-art electrocatalysts with high performance. Herein, we proposed a facile in situ templated method for the fabrication of oxygen-species-modified nitrogen doped carbon nanosheets (O-N-CNs). The epoxy oxygen and ketene oxygen combined with graphitic-nitrogen defects in O-N-CNs gave more active sites for the oxygen-reduction reaction (ORR) and the oxygen-evolution reaction (OER), as proven via theoretical and experimental results, while the carbonyl-oxygen and epoxy-oxygen species showed more efficient electrocatalytic activity for the hydrogen evolution reaction (HER). Hence, the O-N-CNs showed highly active electrocatalytic performance toward ORR, OER, and HER More importantly, the superior multifunctional electrocatalytic activity of O-N-CNs allowed their use in the construction of Zn-air batteries to power the corresponding water-splitting cells. This work can offer an understanding of underlying mechanisms of oxygen species on N-doped carbon materials toward multiple electrocatalysis and facilitate the engineering of electrocatalysts for energy-storage and-conversion devices.
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