Journal
SMALL METHODS
Volume 3, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201800450
Keywords
defects; mesoporous carbon; oxygen reduction reaction; single-atom catalysts; Zn-air batteries
Funding
- National Natural Science Foundation of China [51401134]
- Australian Research Council (ARC) [DE180101030]
- China Scholarship Council
- Australian Research Council [DE180101030] Funding Source: Australian Research Council
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Single-atom catalysts (SACs) with maximum atom-utilization efficiency and distinctive properties are emerging as a new frontier in the field of catalysis. Herein, a new strategy for synthesizing stable Co single atoms with content of about 1.52 wt% on defective bimodal mesoporous carbon materials (A-Co@CMK-3-D) is reported. The dispersion and coordination structures of atomic Co species at carbon defect sites are confirmed by both aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) and X-ray absorption spectrometry, respectively. The obtained catalyst exhibits efficient electrochemical performance on oxygen reduction reaction (ORR) in an alkaline electrolyte with a half-wave potential (0.835 V vs RHE), which is comparable to that of Pt/C (0.839 V vs RHE). Furthermore, the Zn-air batteries (ZABs) fabricated by this electrocatalyst display a superior discharging and charging performance with long-term durability. This work provides a new approach on optimizing SAC-based carbon materials from multiscale principles (simultaneous regulation of electronic structure and hierarchical morphology) to boost ORR reactivity.
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