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Title: p-Type BP nanosheet photocatalyst with AQE of 3.9% in the absence of a noble metal cocatalyst: investigation and elucidation of photophysical properties

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c8ta07034b· OSTI ID:1610669

While stability, significantly poor apparent quantum efficiency (AQE < 0.5%) and over dependence on noble metal cocatalysts is a long standing problem, here, we report, for the first time, microwave-exfoliated p-type few-layer black phosphorous (BP-nanosheets) as a stable photocatalyst for hydrogen production without any supporting noble metal co-catalyst. This few layer BP has shown a record high apparent quantum efficiency (AQE) of ~4% at 420 nm under visible light irradiation. This unprecedented AQE stems from a low level of material oxidation that impedes the degradation of BP under ambient conditions, strong absorption of photons at the surface, and a conduction band edge position that favorably facilitates the proton reduction reaction. These BP-nanosheets have also shown superior photocatalytic performance compared to the known cohort of metal-free photocatalysts such as graphitic carbon nitride, carbon dots, and red-P under identical experimental conditions. An understanding of the photo-physicochemical reasons that drive this chemistry is elucidated along with results obtained from physicochemical characterization and finite difference time domain simulations.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0002219; FG02-09ER16119
OSTI ID:
1610669
Alternate ID(s):
OSTI ID: 1471268
Journal Information:
Journal of Materials Chemistry. A, Vol. 6, Issue 38; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (2)

Black Phosphorus‐Based Semiconductor Heterojunctions for Photocatalytic Water Splitting journal January 2020
Microwave-assisted synthesis of black phosphorus quantum dots: efficient electrocatalyst for oxygen evolution reaction journal January 2019