Engineering of Coordination Environment and Multiscale Structure in Single-Site Copper Catalyst for Superior Electrocatalytic Oxygen Reduction.
basic_science · Level V
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- Record sourced from PubMed, PMID 32697097.
- Also identified by DOI 10.1021/acs.nanolett.0c02677.
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Abstract
Herein, we report efficient single copper atom catalysts that consist of dense atomic Cu sites dispersed on a three-dimensional carbon matrix with highly enhanced mesoporous structures and improved active site accessibility (Cu-SA/NC(meso)). The ratio of +1 to +2 oxidation state of the Cu sites in the Cu-SA/NC(meso) catalysts can be controlled by varying the urea content in the adsorption precursor, and the activity for ORR increases with the addition of Cu<sup>1+</sup> sites. The optimal Cu<sup>1+</sup>-SA/NC(meso)-7 catalyst with highly accessible Cu<sup>1+</sup> sites exhibits superior ORR activity in alkaline media with a half-wave potential (<i>E</i><sub>1/2</sub>) of 0.898 V vs RHE, significantly exceeding the commercial Pt/C, along with high durability and enhanced methanol tolerance. Control experiments and theoretical calculations demonstrate that the superior ORR catalytic performance of Cu<sup>1+</sup>-SA/NC(meso)-7 catalyst is attributed to the atomically dispersed Cu<sup>1+</sup> sites in catalyzing the reaction and the advantage of the introduced mesoporous structure in enhancing the mass transport.