In situ redox growth of mesoporous Pd-Cu2O nanoheterostructures for improved glucose oxidation electrocatalysis

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

3 Scopus Citations
View graph of relations

Author(s)

  • Jianwen Liu
  • Yi-Tao Xu
  • Bo Zhao
  • Xuewan Wang
  • Xian-Zhu Fu
  • Rong Sun
  • Ching-Ping Wong

Detail(s)

Original languageEnglish
Pages (from-to)764–773
Journal / PublicationScience Bulletin
Volume64
Issue number11
Online published17 Apr 2019
Publication statusPublished - 15 Jun 2019

Abstract

Interfaces of metal-oxide heterostructured electrocatalyst are critical to their catalytic activities due to the significant interfacial effects. However, there are still obscurities in the essence of interfacial effects caused by crystalline defects and mismatch of electronic structure at metal-oxide nanojunctions. To deeply understand the interfacial effects, we engineered crystalline-defect Pd-Cu2O interfaces through non-epitaxial growth by a facile redox route. The Pd-Cu2O nanoheterostructures exhibit much higher electrocatalytic activity toward glucose oxidation than their single counterparts and their physical mixture, which makes it have a promising potential for practical application of glucose biosensors. Experimental study and density functional theory (DFT) calculations demonstrated that the interfacial electron accumulation and the shifting up of d bands center of Cu-Pd toward the Fermi level were responsible for excellent electrocatalytic activity. Further study found that Pd(3 1 0) facets exert a strong metal-oxide interface interaction with Cu2O(1 1 1) facets due to their lattice mismatch. This leads to the sinking of O atoms and protruding of Cu atoms of Cu2O, and the Pd crystalline defects, further resulting in electron accumulation at the interface and the shifting up of d bands center of Cu-Pd, which is different from previously reported charge transfer between the interfaces. Our findings could contribute to design and development of advanced metal-oxide heterostructured electrocatalysts.

Research Area(s)

  • Metal-oxide interfaces, Crystalline defects, Interfacial electron accumulation, Electrocatalysts, Density functional theory

Citation Format(s)

In situ redox growth of mesoporous Pd-Cu2O nanoheterostructures for improved glucose oxidation electrocatalysis. / Guo, Ying; Liu, Jianwen; Xu, Yi-Tao; Zhao, Bo; Wang, Xuewan; Fu, Xian-Zhu; Sun, Rong; Wong, Ching-Ping.

In: Science Bulletin, Vol. 64, No. 11, 15.06.2019, p. 764–773.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal