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Shape‐Dependent Properties of Silver Nanocrystals as Electrocatalysts toward Glucose Oxidation Reaction
Author(s) -
Chao YiJu,
Wu ZhengWei,
Hsu SuYang,
Lee ChienLiang
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600737
Subject(s) - catalysis , nanocrystal , amperometry , electrochemistry , materials science , redox , chemical engineering , diffusion , nanotechnology , chemistry , electrode , metallurgy , organic chemistry , physics , engineering , thermodynamics
Ag nanoprisms (mean height 136 nm) and Ag nanodisks (mean diameter 41 nm) that are dominated by (111) planes and Ag nanocubes (mean edge length 38 nm) enclosed by (100) planes were prepared and used as catalysts for the D‐glucose oxidation reaction (GOR). A systematic study of the specific activities of these three Ag catalysts, in terms of the electrochemical real surface area (ERSA), was performed to assess their ability to electrocatalyze glucose oxidation. By measuring current per ERSA for glucose oxidation, an order of nanoprisms > nanocubes > nanodisks was obtained for the activity of catalysis of the intermediate on the Ag 2 O on their surfaces, ascribed to diffusion‐controlled processes. Among these catalysts, the nanoprisms were more sensible to produce Ag 2 O and AgO after GOR. The results of cyclic tests indicated a higher D‐glucose‐tolerance of the nanoprisms and nanodisks. In addition, the amperometric analyses determined sensitivities of 14 mA mM −1 cm −2 , 9.9 mA mM −1 cm −2 , and 5.5 mA mM −1 cm −2 for the nanoprisms, nanocubes, and nanodisks, respectively. The comparison based on the same ERSA showed that the nanoprisms had better activity and sensitivity.