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Insight into the Crucial Factors for Photochemical Deposition of Cobalt Cocatalysts on g‑C3N4 Photocatalysts
journal contribution
posted on 2018-02-27, 00:00 authored by Na Zhao, Linggang Kong, Yuming Dong, Guangli Wang, Xiuming Wu, Pingping JiangPhotochemical
preparation of inexpensive hydrogen evolution cocatalysts is of great
significance and is challenging. Currently, the crucial factors in
the photochemical preparation of nonnoble metals are still unknown.
In this work, taking Co/g-C3N4 composite photocatalysts
as a case, complexing agents and sacrificial agents were found to
be the crucial factors for the photochemical deposition process. Cobalt
was supported on the electron outlet points of g-C3N4 for 1 h, and the ratio of Co in the Co/g-C3N4 composite photocatalyst can be regulated by changing the
irradiation time of the preparation process. The optimized hydrogen
evolution rate of Co/g-C3N4 was about 11.48
μmol h–1, which was 75 times more than pure
g-C3N4. The photocatalytic H2 evolution
rate was stable after 48 h. The mechanism for the high activity of
Co/g-C3N4 composites was explored by surface
photovoltage spectra and photoluminescence spectra. Co effectively
promoted the separation of the photogenerated electrons and holes
of g-C3N4 and improved the H2 production
rate.
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Keywords
photocatalytic H 2 evolution rateirradiation timephotogenerated electrons75 timespreparation processH 2 production rateCobalt CocatalystsPhotochemical Depositiondeposition process48 hhydrogen evolution cocatalystsnonnoble metalsg-C 3 N 4complexing agentsphotoluminescence spectraCrucial Factorssurface photovoltage spectra1 helectron outlet pointsoptimized hydrogen evolution rate
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