TY - JOUR
T1 - Ultrathin Pt-Ag Alloy Nanotubes with Regular Nanopores for Enhanced Electrocatalytic Activity
AU - Liu, Hongpo
AU - Liu, Kai
AU - Zhong, Ping
AU - Qi, Jing
AU - Bian, Jihong
AU - Fan, Qikui
AU - Ren, Kui
AU - Zheng, Haoquan
AU - Han, Lu
AU - Yin, Yadong
AU - Gao, Chuanbo
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/11/13
Y1 - 2018/11/13
N2 - While creating open nanostructures represents a popular strategy for improving the utilization efficiency of Pt-based catalysts for electrochemical reactions, the exposed facets should be precisely controlled for further enhancement of the catalytic activity. Here, we report a novel strategy for creating regularly shaped nanopores in ultrathin nanotubes of bimetallic noble metals. By templating against Ag nanowires and then applying a thermal ripening process, we have successfully produced ultrathin (with a wall thickness of ∼1 nm) Pt-Ag alloy nanotubes containing high-density well-defined rectangular nanopores and a collapsed double-layer structure. The resulting porous nanotubes expose {100} facets at the basal sides and {110} facets with step sites at the edges of the rectangular nanopores. The particular surface structure and the bimetallic composition enable suppressed CO poisoning of the catalysts and consequently enhanced electrocatalytic activity in the methanol oxidation reaction. The typical specific and mass activities are 6.63 mA cm-2 and 2.08 mA (μg of Pt)-1, respectively, in an acidic medium, superior to the values of commercial Pt/C and many previously reported catalysts. We believe this work opens new opportunities in the design of noble metal open nanostructures for enhanced performance in a broad range of catalytic applications.
AB - While creating open nanostructures represents a popular strategy for improving the utilization efficiency of Pt-based catalysts for electrochemical reactions, the exposed facets should be precisely controlled for further enhancement of the catalytic activity. Here, we report a novel strategy for creating regularly shaped nanopores in ultrathin nanotubes of bimetallic noble metals. By templating against Ag nanowires and then applying a thermal ripening process, we have successfully produced ultrathin (with a wall thickness of ∼1 nm) Pt-Ag alloy nanotubes containing high-density well-defined rectangular nanopores and a collapsed double-layer structure. The resulting porous nanotubes expose {100} facets at the basal sides and {110} facets with step sites at the edges of the rectangular nanopores. The particular surface structure and the bimetallic composition enable suppressed CO poisoning of the catalysts and consequently enhanced electrocatalytic activity in the methanol oxidation reaction. The typical specific and mass activities are 6.63 mA cm-2 and 2.08 mA (μg of Pt)-1, respectively, in an acidic medium, superior to the values of commercial Pt/C and many previously reported catalysts. We believe this work opens new opportunities in the design of noble metal open nanostructures for enhanced performance in a broad range of catalytic applications.
UR - https://www.scopus.com/pages/publications/85056567286
U2 - 10.1021/acs.chemmater.8b03085
DO - 10.1021/acs.chemmater.8b03085
M3 - 文章
AN - SCOPUS:85056567286
SN - 0897-4756
VL - 30
SP - 7744
EP - 7751
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 21
ER -