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Promoting Photocatalytic Hydrogen Evolution Activity of Graphitic Carbon Nitride with Hole‐Transfer Agents
Author(s) -
Indra Arindam,
BeltránSuito Rodrigo,
Müller Marco,
Sivasankaran Ramesh P.,
Schwarze Michael,
Acharjya Amitava,
Pradhan Bapi,
Hofkens Johan,
Brückner Angelika,
Thomas Arne,
Menezes Prashanth W.,
Driess Matthias
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002500
Subject(s) - photocatalysis , graphitic carbon nitride , photochemistry , hydrogen production , carbon nitride , photoluminescence , electron transfer , materials science , electron hole , water splitting , acceptor , electron acceptor , chemistry , hydrogen , catalysis , electron , optoelectronics , organic chemistry , physics , quantum mechanics , condensed matter physics
Visible light‐driven photocatalytic reduction of protons to H 2 is considered a promising way of solar‐to‐chemical energy conversion. Effective transfer of the photogenerated electrons and holes to the surface of the photocatalyst by minimizing their recombination is essential for achieving a high photocatalytic activity. In general, a sacrificial electron donor is used as a hole scavenger to remove photogenerated holes from the valence band for the continuation of the photocatalytic hydrogen (H 2 ) evolution process. Here, for the first time, the hole‐transfer dynamics from Pt‐loaded sol−gel‐prepared graphitic carbon nitride (Pt‐sg‐CN) photocatalyst were investigated using different adsorbed hole acceptors along with a sacrificial agent (ascorbic acid). A significant increment (4.84 times) in H 2 production was achieved by employing phenothiazine (PTZ) as the hole acceptor with continuous H 2 production for 3 days. A detailed charge‐transfer dynamic of the photocatalytic process in the presence of the hole acceptors was examined by time‐resolved photoluminescence and in situ electron paramagnetic resonance studies.