New Insight into Procedure of Interface Electron Transfer through Cascade System with Enhanced Photocatalytic Activity.
Xingming NingWenqi LiYao MengDongdong QinJing ChenXiang MaoZhonghua XueDuoliang ShanSamrat DevaramaniXiao-Quan LuPublished in: Small (Weinheim an der Bergstrasse, Germany) (2018)
Recombination of photogenerated electron-hole pairs is extremely limited in the practical application of photocatalysis toward solving the energy crisis and environmental pollution. A rational design of the cascade system (i.e., rGO/Bi2 WO6 /Au, and ternary composites) with highly efficient charge carrier separation is successfully constructed. As expected, the integrated system (rGO/Bi2 WO6 /Au) shows enhanced photocatalytic activity compared to bare Bi2 WO6 and other binary composites, and it is proved in multiple electron transfer (MET) behavior, namely a cooperative electron transfer (ET) cascade effect. Simultaneously, UV-vis/scanning electrochemical microscopy is used to directly identify MET kinetic information through an in situ probe scanning technique, where the "fast" and "slow" heterogeneous ET rate constants (Keff ) of corresponding photocatalysts on the different interfaces are found, which further reveals that the MET behavior is the prime source for enhanced photocatalytic activity. This work not only offers a new insight to study catalytic performance during photocatalysis and electrocatalysis systems, but also opens up a new avenue to design highly efficient catalysts in photocatalytic CO2 conversion to useful chemicals and photovoltaic devices.
Keyphrases
- visible light
- electron transfer
- highly efficient
- reduced graphene oxide
- high resolution
- tyrosine kinase
- heavy metals
- electron microscopy
- risk assessment
- gold nanoparticles
- solar cells
- dna repair
- human health
- wastewater treatment
- single molecule
- living cells
- minimally invasive
- particulate matter
- health risk assessment
- health information
- label free
- sensitive detection
- climate change