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Doping Carbon Nitride Quantum Dots into Melamine‐Silver Matrix: An Efficient Photocatalyst with Tunable Morphology and Photocatalysis for H 2 O 2 Evolution under Visible Light
Author(s) -
Yin Mengyuan,
Chen Xi,
Wan Yuqi,
Zhang Wenwen,
Feng Luping,
Zhang Lixiang,
Wang Hua
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201902045
Subject(s) - photocatalysis , materials science , visible spectrum , graphitic carbon nitride , nanocomposite , mesoporous material , quantum dot , water splitting , quantum yield , carbon nitride , nanotechnology , photochemistry , chemical engineering , catalysis , chemistry , optoelectronics , fluorescence , organic chemistry , optics , physics , engineering
Carbon nitride quantum dots (CN QDs ) were doped into melamine (MA) and silver (Ag) matrix yielding CN QDs @MA−Ag nanocomposites by the supramolecular self‐assembly route. To our surprise, the resulting mesoporous nanocomposites could present different morphologies (i. e., nanowires, nanoflowers, and nanosheets) and especially tunable visible‐light photocatalysis performances depending on the percentages of CN QDs used. It was discovered that the CN QDs @MA−Ag ones with the pinecone‐like structure (containing 30 % CN QDs ) could exhibit the strongest visible‐light photocatalysis for splitting water to yield H 2 O 2 with a production efficiency of 39.82 μmol ⋅ g −1 h −1 , which is more than ten‐fold higher than that of CN QDs alone. Herein, the nano‐scaled Ag could facilitate the increased light harvesting and the separation as well as transmission of electron‐hole pairs of CN QDs resulting in the enhanced visible‐light photocatalysis of nanocomposites. More importantly, the pinecone‐like ones might additionally enable more exposed active sites of photocatalysis and larger mesoporous specific area of contacting dissolved oxygen in water, leading to the higher photocatalytic efficiency of H 2 O 2 generation. This CN QDs ‐based fabrication strategy may open a new door towards the design of a variety of photocatalysts with different morphologies and tunable photocatalysis performances for the efficient splitting water toward H 2 O 2 evolution under sunlight.