Self-limiting growth of ligand-free ultrasmall bimetallic nanoparticles on carbon through under temperature reduction for highly efficient methanol electrooxidation and selective hydrogenation
Hu, MZ (Hu, Mingzhen)[ 1,2 ] ; Jin, L (Jin, Lei)[ 2 ] ; Zhu, YY (Zhu, Yuanyuan)[ 3,4 ] ; Zhang, L (Zhang, Lei)[ 1,2 ] ; Lu, XX (Lu, Xingxu)[ 4 ] ; Kerns, P (Kerns, Peter)[ 2 ] ; Su, XS (Su, Xingsong)[ 1,2 ] ; Cao, S (Cao, Sen)[ 2 ] ; Gao, PX (Gao, Puxian)[ 3,4 ] ; Suib, SL (Suib, Steven L.)[ 2,3,4 ] ; Liu, B (Liu, Ben)[ 1 ]*（刘犇）; He, J (He, Jie)[ 2,3 ]*
[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Peoples R China
[ 2 ] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA
[ 3 ] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
[ 4 ] Univ Connecticut, Dept Mat Sci & Engn, Storrs, CT 06269 USA
APPLIED CATALYSIS B-ENVIRONMENTAL，202005,264
We report a self-limiting growth method of ultrasmall Pd-containing bimetallic nanocatalysts supported on carbon through under temperature reduction (UTR). The UTR phenomenon is observed for the (co)reduction of a second base metal precursor (M = Co, Ni, and Zn) below its thermodynamic reduction temperature in the presence of Pd. The origin of the UTR phenomenon lies in the hydrogen spillover of Pd to drive the (co)reduction of the base metal at the temperature below its thermodynamic reduction temperature; while, the further reduction is shut down simultaneously to limit the overgrowth of nanoparticles when forming nanoalloys. Using nitrided carbon as a support, we demonstrate the self-limiting growth of three Pd-containing nanoalloys, including Pd1.7Co, Pd1.6Ni and Pd2Zn, with average sizes around 1.5 nm using UTR. Sub-2 run Pd-containing bimetallic nanoalloys exhibited excellent catalytic properties in both methanol electrooxidation and selective hydrogenation of cinnamaldehyde.