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A Cu and Fe dual-atom nanozyme mimicking cytochrome c oxidase to boost the oxygen reduction reaction.
- Source :
- Journal of Materials Chemistry A; 9/7/2020, Vol. 8 Issue 33, p16994-17001, 8p
- Publication Year :
- 2020
-
Abstract
- The intrinsically sluggish kinetics of the oxygen reduction reaction (ORR) and overuse of expensive and unstable Pt-based catalysts have severely hampered the development of clean energy technologies. Herein, a type of non-noble metal nanozyme as an ORR electrocatalyst, with Fe–Cu dual atomic sites embedded in three-dimensional porous N-doped carbon (FeCu-DA/NC), is fabricated by mimicking both the constituents of active centers and enzymatic microenvironment of Cytochrome c oxidase (CcO). The atomically dispersed Fe–Cu single atom sites are clearly identified by direct aberration-corrected transmission electron microscopy imaging, systematic X-ray absorption fine structure (XAFS) analyses, and density functional theory (DFT) calculations. FeCu-DA/NC exhibits a superior ORR activity, with about 30 mV more positive half-wave potential (E<subscript>1/2</subscript>) than that of commercial Pt/C catalysts in a base, and moreover with only an E<subscript>1/2</subscript> gap of 20 mV to Pt/C in an acid. Importantly, FeCu-DA/NC displays an excellent durability under both acidic and basic conditions, which is much superior to that of Pt/C. DFT calculations further demonstrate that the enhanced performance can be attributed to the unique synergistic effect between Cu and Fe single atoms in which Cu–N<subscript>4</subscript> serves as the electron donor to increase the electron density of the active centers of Fe–N<subscript>4</subscript> and thus to facilitate O<subscript>2</subscript> activation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 8
- Issue :
- 33
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 145300298
- Full Text :
- https://doi.org/10.1039/d0ta06485h