Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 31, Pages 9749-9753Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804530
Keywords
carbon nitride; charge separation; defects; electron collectors; photoelectrochemical water splitting
Categories
Funding
- National Key RAMP
- D Program of China [2018YFA0209301]
- National Natural Science Foundation of China [21425309, 21761132002, 21703040, 21861130353]
- 111 Project
- PPP project [201801940018]
- China Postdoctoral Science Foundation [2017M622051, 2018T110639]
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Polymeric carbon nitride (PCN) photosensitizers are proposed replacements for their inorganic counterparts in solar-to-fuel conversion via photoelectrochemical water splitting. However, intense charge recombination, primarily because of surface defects, limits the use of PCN in PEC systems. Now, photoanodes are designed by coating PCN films onto highly conductive yttrium-doped zinc oxide (Y:ZnO) nanorods (NRs) serving as charge collectors. The generation of charge carriers can therefore be promoted by this typeII alignment. The charge collectors would be kept nearby for charge separation and transport to be used in the interfacial redox reactions. The photocurrent density of the polymer electrode is improved to 0.4mAcm(-2) at 1.23V vs. the reversible hydrogen electrode in a Na2SO4 electrolyte solution under AM1.5 illumination. The result reveals a more than 50-fold enhancement over the PCN films achieved by powder; the efficiency can be preserved at 95% for 160minutes.
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