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Updated: Jan 8, 2026
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Hydrogen-Substituted Graphdiyne-Anchored Ag Single-Atom Catalyst for Highly Efficient Electrochemical CO2 Reduction
Jing Ai1, Peng Zhao1, Hao Jiang1
1Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, P. R. China.
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Ag single-atom catalysts (SACs) are promising for electrochemical CO2 reduction reaction (e-CO2RR) due to their high atom utilization and CO selectivity, yet they often suffer from agglomeration and instability. Here, we employ hydrogen-substituted graphdiyne (HGDY) as a robust support, where abundant alkyne groups strongly coordinate and stabilize atomically dispersed Ag sites. By systematically tuning Ag loading (0.3-10 wt.%), we achieve precise control over active sites and product distribution. The optimized Ag3.7-HGDY catalyst achieves a remarkable CO Faradaic efficiency (FECO) of 98.1% with a turnover frequency (TOF) of 26.5 s-1, maintaining a FECO of ≥97% across a wide potential window (-0.7 to -1.2 V vs RHE). Moreover, Ag loading enables dynamic modulation of CO/H2 ratios in syngas, highlighting the tunability of the system. This work demonstrates an effective strategy for anchoring noble metals via alkyne coordination, offering a generalizable pathway toward the rational design of stable and scalable single-atom catalysts for CO2 conversion.
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