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Heteroatom Dopants Promote Two‐Electron O 2 Reduction for Photocatalytic Production of H 2 O 2 on Polymeric Carbon Nitride
Author(s) -
Zhang Peng,
Tong Yawen,
Liu Yong,
Vequizo Junie Jhon M.,
Sun Hongwei,
Yang Can,
Yamakata Akira,
Fan Fengtao,
Lin Wei,
Wang Xinchen,
Choi Wonyong
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006747
Subject(s) - dopant , heteroatom , photocatalysis , selectivity , chemistry , carbon nitride , carbon fibers , electrochemistry , photochemistry , inorganic chemistry , materials science , catalysis , doping , organic chemistry , electrode , ring (chemistry) , optoelectronics , composite number , composite material
Polymeric carbon nitride modified with selected heteroatom dopants was prepared and used as a model photocatalyst to identify and understand the key mechanisms required for efficient photoproduction of H 2 O 2 via selective oxygen reduction reaction (ORR). The photochemical production of H 2 O 2 was achieved at a millimolar level per hour under visible‐light irradiation along with 100 % apparent quantum yield (in 360–450 nm region) and 96 % selectivity in an electrochemical system (0.1 V vs. RHE). Spectroscopic analysis in spatiotemporal resolution and theoretical calculations revealed that the synergistic association of alkali and sulfur dopants in the polymeric matrix promoted the interlayer charge separation and polarization of trapped electrons for preferable oxygen capture and reduction in ORR kinetics. This work highlights the key features that are responsible for controlling the photocatalytic activity and selectivity toward the two‐electron ORR, which should be the basis of further development of solar H 2 O 2 production.