Phosphine‐Triggered Structural Defects in Au44 Homologues Boost Electrocatalytic CO2 Reduction

Author:

Zhuang Shengli12,Chen Dong3,Ng Wai‐Pan14,Liu Li‐Juan1,Sun Meng‐Ying1,Liu Dongyi1,Nawaz Tehseen1,Xia Qi1,Wu Xia1,Huang Yong‐Liang5,Lee Seungkyu1,Yang Jun14ORCID,Yang Jun3ORCID,He Jian12ORCID

Affiliation:

1. Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong P. R. China

2. State Key Laboratory of Synthetic Chemistry The University of Hong Kong Pokfulam Road Hong Kong P. R. China

3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China

4. Hong Kong Quantum AI Lab Limited Hong Kong P. R. China

5. Department of Medicinal Chemistry Shantou University Medical College Shantou, Guangdong 515041 P. R. China

Abstract

AbstractThe systematic induction of structural defects at the atomic level is crucial to metal nanocluster research because it endows cluster‐based catalysts with highly reactive centers and allows for a comprehensive investigation of viable reaction pathways. Herein, by substituting neutral phosphine ligands for surface anionic thiolate ligands, we establish that one or two Au3 triangular units can be successfully introduced into the double‐stranded helical kernel of Au44(TBBT)28, where TBBT=4‐tert‐butylbenzenethiolate, resulting in the formation of two atomically precise defective Au44 nanoclusters. Along with the regular face‐centered‐cubic (fcc) nanocluster, the first series of mixed‐ligand cluster homologues is identified, with a unified formula of Au44(PPh3)n(TBBT)28−2n (n=0–2). The Au44(PPh3)(TBBT)26 nanocluster having major structural defects at the bottom of the fcc lattice demonstrates superior electrocatalytic performance in the CO2 reduction to CO. Density functional theory calculations indicate that the active site near the defects significantly lowers the free energy for the *COOH formation, the rate‐determining step in the whole catalytic process.

Funder

Research Grants Council, University Grants Committee

National Natural Science Foundation of China

Croucher Foundation

Publisher

Wiley

Subject

General Chemistry,Catalysis

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