119th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Scholars in Electrochemistry
Room No. 406호
Time THU 09:00-:
Code ELEC.O-1
Subject Electrocatalytic Hydrogen Production on Atomically Precise M@Au24(SR)18 (M=Au,Pt) Nanoclusters
Authors 최우준, 이동일*
연세대학교 화학과, Korea
Abstract Atomically precise gold nanoclusters containing from a few to a few hundreds of atoms have received great attention due to their unique electronic structure, stability and catalytic activity. Especially, ultrasmall Au25 nanocluster that contains 25 Au atoms has distinctive catalytic activity for renewable energy production such as CO2 reduction reaction (CO2 RR) and hydrogen evolution reaction (HER). Furthermore, the activity and selectivity for the catalytic reactions can be easily modified by introducing the foreign metals such as Pt and Pd in Au25 platform. In this presentation, we successfully synthesized the ultrasmall Au nanocluster, Au25(SR)18 (SR=thiolate), and bimetallic clusters MAu24(SR)18 (M=Pt) and revealed their electronic structures and catalytic properties. Au25 have remarkable catalytic activity for CO2 RR with high selectivity for CO over H2 at low overpotential where it has poor activity for HER. Enhanced catalytic activity for HER was observed by doping of a Pt atom into Au25 nanocluster. Pt doped nanocluster, PtAu24, have very low onsetpotential (Eonset = 70mV vs. RHE) that is comparable to that of natural hydrogenase (~100 mV) enzymes and high TOF value that is 34 mol H2 mol/cat·s (at η = 0.6 V) for electrocatalytic HER owing to decreased reduction potential and thermodynamically neutral binding energy of proton on Pt atom. These modified catalytic activities of Au25 and PtAu24 suggests that doping of clusters is a powerful means to fine-tune the catalytic properties of clusters, offering special advantages in the development of new functional electrocatalysts.
E-mail phungse@naver.com