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Issue 38, 2018
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p-Type BP nanosheet photocatalyst with AQE of 3.9% in the absence of a noble metal cocatalyst: investigation and elucidation of photophysical properties

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Abstract

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.

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

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Supplementary files

Article information


Submitted
20 Jul 2018
Accepted
05 Sep 2018
First published
05 Sep 2018

J. Mater. Chem. A, 2018,6, 18403-18408
Article type
Communication
Author version available

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

M. Z. Rahman, M. Batmunkh, M. Bat-Erdene, J. G. Shapter and C. B. Mullins, J. Mater. Chem. A, 2018, 6, 18403
DOI: 10.1039/C8TA07034B

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