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Title: Silver silicates with three-dimensional d{sup 10}-d{sup 10} interactions as visible light active photocatalysts for water oxidation

Ag{sub 2}SiO{sub 3} and Ag{sub 9}(SiO{sub 4}){sub 2}NO{sub 3} with the short Ag–Ag bond distances close to metallic Ag have optical band gaps of 2.6 eV and 2.0 eV, respectively. They oxidized water molecules to oxygen with the rates of 98 and 194 μmol/g · h by the 280 mW/cm{sup 2} visible-light illumination, and decolorized organic dye more than 10 times faster than the commercialized WO{sub 3} and TiO{sub 2}. Based on the electronic structure calculation, their small band gaps and superior carrier transport property are correlated with the spatial proximity between Ag ions stabilized by d{sup 10}-d{sup 10} interaction, which promotes the descent and dispersion of conduction bands by increasing Ag 5s/5p orbital overlaps.
Authors:
; ; ; ;  [1]
  1. Advanced Materials Research Center, Samsung Advanced Institute of Technology, Nongseo-dong - Giheung-gu, Yongin-si, Gyeonggi-do 446-712 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22218309
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 4; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BOND LENGTHS; CARRIER LIFETIME; CARRIERS; ELECTRONIC STRUCTURE; ENERGY GAP; EV RANGE; OXIDATION; SEMICONDUCTOR MATERIALS; SILICATES; SILVER; SILVER COMPOUNDS; SILVER IONS; TITANIUM OXIDES; TUNGSTEN OXIDES; VISIBLE RADIATION; WATER