Insight
into the Crucial Factors for Photochemical Deposition of Cobalt Cocatalysts
on g‑C<sub>3</sub>N<sub>4</sub> Photocatalysts
Na Zhao
Linggang Kong
Yuming Dong
Guangli Wang
Xiuming Wu
Pingping Jiang
10.1021/acsami.8b01590.s001
https://acs.figshare.com/articles/journal_contribution/Insight_into_the_Crucial_Factors_for_Photochemical_Deposition_of_Cobalt_Cocatalysts_on_g_C_sub_3_sub_N_sub_4_sub_Photocatalysts/5965168
Photochemical
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-C<sub>3</sub>N<sub>4</sub> 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-C<sub>3</sub>N<sub>4</sub> for 1 h, and the ratio of Co in the Co/g-C<sub>3</sub>N<sub>4</sub> composite photocatalyst can be regulated by changing the
irradiation time of the preparation process. The optimized hydrogen
evolution rate of Co/g-C<sub>3</sub>N<sub>4</sub> was about 11.48
μmol h<sup>–1</sup>, which was 75 times more than pure
g-C<sub>3</sub>N<sub>4</sub>. The photocatalytic H<sub>2</sub> evolution
rate was stable after 48 h. The mechanism for the high activity of
Co/g-C<sub>3</sub>N<sub>4</sub> composites was explored by surface
photovoltage spectra and photoluminescence spectra. Co effectively
promoted the separation of the photogenerated electrons and holes
of g-C<sub>3</sub>N<sub>4</sub> and improved the H<sub>2</sub> production
rate.
2018-02-27 00:00:00
photocatalytic H 2 evolution rate
irradiation time
photogenerated electrons
75 times
preparation process
H 2 production rate
Cobalt Cocatalysts
Photochemical Deposition
deposition process
48 h
hydrogen evolution cocatalysts
nonnoble metals
g-C 3 N 4
complexing agents
photoluminescence spectra
Crucial Factors
surface photovoltage spectra
1 h
electron outlet points
optimized hydrogen evolution rate