Ultrafast Condensation of Carbon Nitride on Electrodes with Exceptional Boosted Photocurrent and Electrochemiluminescence

Semiconducting polymeric carbon nitride (CN) has drawn wide attention ranging from photocatalysis to more recent biosensing owing to unique defect‐tolerated optoelectronic properties and being metal‐free, cheap, and highly stable. However, at the core of electrical–optical interconversion, the prepa...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-01, Vol.59 (3), p.1139-1143
Main Authors: Zhao, Tingting, Zhou, Qing, Lv, Yanqin, Han, Dan, Wu, Kaiqing, Zhao, Lufang, Shen, Yanfei, Liu, Songqin, Zhang, Yuanjian
Format: Article
Language:English
Subjects:
Aqueous solutions
Biosensors
Carbon
Carbon nitride
Electrochemiluminescence
Electrodes
energy conversion
Optoelectronics
photocatalysis
Photoelectric effect
Photoelectric emission
photoelectrochemistry
Polymerization
Prepolymers
Volatilization
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Summary:Semiconducting polymeric carbon nitride (CN) has drawn wide attention ranging from photocatalysis to more recent biosensing owing to unique defect‐tolerated optoelectronic properties and being metal‐free, cheap, and highly stable. However, at the core of electrical–optical interconversion, the preparation of the CN photoelectrode is still challenging. Now, the growth of CN on electrodes is achieved simply by microwave‐assisted condensation in seconds. The ultrafast heating not only addressed the thermodynamic contradiction of precursor volatilization during polymerization but also led to strongly adhesive CN layer on electrodes with gradient carbon‐rich texture, greatly accelerating the electron–hole separation and mobility. Consequently, the CN photoelectrode exhibited a remarkable photocurrent and a record cathodic efficiency of electrochemiluminescence up to 7 times that of benchmark Ru(bpy)3Cl2 in aqueous solution. Ultrafast heating addresses the thermodynamic contradiction of precursor volatilization during polymerization and leads to strongly adhesive carbon nitride on electrodes with a gradient C‐rich texture. Charge separation and mobility are accelerated and a remarkable photocurrent and a record cathodic electrochemiluminescence efficiency are observed.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201911822