p-Type BP nanosheet photocatalyst with AQE of 3.9% in the absence of a noble metal cocatalyst: investigation and elucidation of photophysical properties
- Univ. of Adelaide, SA (Australia); Univ. of Texas, Austin, TX (United States)
- Univ. of Queensland, Brisbane, QLD (Australia); Flinders Univ., Adelaide, SA (Australia)
- Univ. of Texas, Austin, TX (United States)
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
Web of Science
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 |
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