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Hydrogen-Bonded Organic Framework Supporting Atomic Bi-NO Sites for High-Efficiency Electrocatalytic CO Reduction. | LitMetric
Single atomic catalysts (SACs) offer a superior platform for studying the structure-activity relationships during electrocatalytic CO reduction reaction (CORR). Yet challenges still exist to obtain well-defined and novel site configuration owing to the uncertainty of functional framework-derived SACs through calcination. Herein, a novel Bi-NO site supported on the (1 1 0) plane of hydrogen-bonded organic framework (HOF) is reported directly for CORR. In flow cell, the target catalyst Bi1-HOF maintains a faradaic efficiency (FE) HCOOH of over 90 % at a wide potential window of 1.4 V. The corresponding partial current density ranges from 113.3 to 747.0 mA cm. And, Bi1-HOF exhibits a long-term stability of over 30 h under a successive potential-step test with a current density of 100-400 mA cm. Density function theory (DFT) calculations illustrate that the novel Bi-NO site supported on the (1 1 0) plane of HOF effectively induces the oriented electron transfer from Bi center to CO molecule, reaching an enhanced CO activation and reduction. Besides, this study offers a versatile method to reach series of M-NO sites with regulable metal centers via the same intercalation mechanism, broadening the platform for studying the structure-activity relationships during CORR.
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