A Polymer Solution To Prevent Nanoclustering and Improve the Selectivity of Metal Nanoparticles for Electrocatalytic CO2 Reduction 
Zhang, L (Zhang, Lei)[ 1,2 ] ; Wei, ZC (Wei, Zichao)[ 2 ] ; Thanneeru, S (Thanneeru, Srinivas)[ 2 ] ; Meng, M (Meng, Michael)[ 2 ] ; Kruzyk, M (Kruzyk, Megan)[ 2 ] ; Ung, G (Ung, Gael)[ 2 ] ; Liu, B (Liu, Ben)[ 1 ]*（刘犇） ; He, J (He, Jie)[ 2,3 ]*

[ 1 ] Nanjing Normal Univ, Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA
[ 3 ] Univ Connecticut, Inst Mat Sci, Polymer Program, Storrs, CT 06269 USA

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION，201909, DOI: 10.1002/anie.201909069

The stability of metal nanocatalysts for electrocatalytic CO2 reduction is of key importance for practical application. We report the use of two polymeric N-heterocyclic carbenes (NHC) (polydentate and monodentate) to stabilize metal nanocatalysts (Au and Pd) for efficient CO2 electroreduction. Compared with other conventional ligands including thiols and amines, metal-carbene bonds that are stable under reductive potentials prevent the nanoclustering of nanoparticles. Au nanocatalysts modified by polymeric NHC ligands show an activity retention of 86 % after CO2 reduction at -0.9 V for 11 h, while it is less than 10 % for unmodified Au. We demonstrate that the hydrophobicity of polymer ligands and the enriched surface electron density of metal NPs through sigma-donation of NHCs substantially improve the selectivity for CO2 reduction over proton.

文章链接：
https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201909069

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