Article Title

Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties

Authors

Shaohan Yang, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Shuna Li, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Lianghao Song, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Yipin Lv, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Zhongyao Duan, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Chunsheng Li, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Raphael Francesco Praeg, Institute for Solar Fuels, Helmholtz Zentrum Berlin fur Materialien und Energie GmbH, Berlin 14109, Germany
Daowei Gao, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China Young Investigator Group Operando Characterization of Solar Fuel Materials, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin 12489, Germany
Guozhu Chen, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China

Keywords

nanoframes, defect-density, high-index facets, electrocatalyst

Abstract

Structure-engineered platinum-based nanoframes (NFs) at the atomic level can effectively improve the catalytic performance for fuel cells and other heterogeneous catalytic fields. We report herein, a microwave-assisted wet-chemical method for the preparation of platinumcopper-cobalt NFs with tunable defect density and architecture, which exhibit enhanced activity and durability towards the electro-oxidation reactions of methanol (MOR) and formic acid (FAOR). By altering the reduction/capping agents and thus the nucleation/growth kinetics, trimetallic platinum-copper-cobalt hexapod NFs with different density high-index facets are achieved. Especially, the rough hexapod nanoframes (rh-NFs) exhibit excellent specific activities towards MOR and FAOR, 7.25 and 5.20 times higher than those of benchmark Pt/C, respectively, along with prolonged durability. The excellent activities of the rh-NFs are assigned to a synergistic effect, including high density of defects and high-index facets, suitable d-band center, and open-framework structure. This synergistic working mechanism opens up a new way for enhancing their electrocatalytic performances by increasing defect density and high-index facets in open-framework platinum-based NFs.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-019-2530-5

Publisher

Tsinghua University Press

Recommended Citation

Shaohan Yang,Shuna Li,Lianghao Song,Yipin Lv,Zhongyao Duan,Chunsheng Li,Raphael Francesco Praeg,Daowei Gao,Guozhu Chen, Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties. NanoRes.2019, 12(11): 2881–2888