Fast Oxidation of Porous Cu Induced by Nano-Twinning

Kazue Nishimoto, Marian Krajčí, Takayuki Sakurai, Hirone Iwamoto, Mitsuko Onoda, Chikashi Nishimura, Jeng Ting Tsai, Sea Fue Wang, Satoshi Kameoka, An Pang Tsai

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The fcc lattice of porous Cu prepared by dealloying Al2Cu with HCl aqueous solution exhibits a high density of twinning defects with an average domain size of about 3 nm along the '111' directions. The high density of twinning was verified by X-ray diffraction and qualitatively interpreted by a structural model showing the 5% probability of twinning defect formation. Most of the twinning defects disappeared after annealing at 873 K for 24 h. Twinned Cu reveals much faster oxidation rate in comparison to that without (or with much fewer) twinning defects, as shown by X-ray diffraction and hydrogen differential scanning calorimetry. Using ab initio DFT calculations, we demonstrate that twinning defects in porous Cu are able to form nucleation centers for the growth of Cu2O. The geometry of the V-shaped edges on the twinned {211} surfaces is favorable for formation of the basic structural elements of Cu2O. The fast oxidation of porous Cu prepared by dealloying can thus be explained by the fast formation of the Cu2O nucleation centers and their high density.

Original languageEnglish
Pages (from-to)2908-2916
Number of pages9
JournalInorganic chemistry
Volume57
Issue number5
DOIs
Publication statusPublished - 2018 Mar 5

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Fast Oxidation of Porous Cu Induced by Nano-Twinning'. Together they form a unique fingerprint.

Cite this