TY  - JOUR
AU  - Wang, Chaoqi
AU  - Li, Xiang
AU  - Jin, Lei
AU  - Lu, Peng-Han
AU  - Dejoie, Catherine
AU  - Zhu, Wenxin
AU  - Wang, Zhenni
AU  - Bi, Wei
AU  - Dunin-Borkowski, Rafal E.
AU  - Chen, Kai
AU  - Jin, Mingshang
TI  - Etching-Assisted Route to Heterophase Au Nanowires with Multiple Types of Active Surface Sites for Silane Oxidation
JO  - Nano letters
VL  - 19
IS  - 9
SN  - 1530-6992
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2020-02967
SP  - 6363 - 6369
PY  - 2019
AB  - The construction of multiple types of active sites on the surface of a metallic catalyst can markedly enhance its catalytic activity toward specific reactions. Here, we show that heterophase gold nanowires (Au NWs) with multiple types of active surface sites can be synthesized using an etching-assisted process, yielding the highest reported turnover frequency (TOF) for Au catalysts toward the silane oxidation reaction by far. We use synchrotron powder X-ray diffraction (PXRD) and aberration-corrected (scanning) transmission electron microscopy (TEM) to show that the Au NWs contain heterophase structures, planar defects, and surface steps. Moreover, the contribution to the catalytic performance from each type of active sites was clarified. Surface steps on the Au NW catalysts, which were identified using aberration-corrected (scanning) TEM, were shown to play the most important role in enhancing the catalytic performance. By using synchrotron PXRD, it was shown that a small ratio of metastable phases within Au NWs can enhance catalytic activity by a factor of 1.35, providing a further route to improve catalytic activity. Of the three types of surface active sites, surface terminations of planar defects such as twin boundaries (TB) and stacking faults (SF) are less active than metastable phases and surface steps for Au catalysts toward the silane oxidation reaction. Such an etching-assisted synthesis of heterophase Au NWs promises to open new possibilities for catalysis, plasmonic, optics, and electrical applications.
LB  - PUB:(DE-HGF)16
C6  - pmid:31361961
UR  - <Go to ISI:>//WOS:000486361900068
DO  - DOI:10.1021/acs.nanolett.9b02532
UR  - https://juser.fz-juelich.de/record/878639
ER  -