Abstract
The exploration of multiple composite with heterojunction structures to replace single catalysts with insufficient capacity is significant for the photocatalytic evolution of high-yield hydrogen. In this case, the Mo2S3/Bi2O2CO3 composite with a unique n-n heterojunction and two-dimensional (2D) spatial structure was successfully prepared for the first time using the hydrothermal-physical mixture method. The percentage of Bi2O2CO3 in the composite can be easily adjusted by changing the amount of Bi2O2CO3 introduced into the physical mixing process. With a mass percentage of Bi2O2CO3 attained 3% to Mo2S3, the composite Mo2S3/Bi2O2CO3 with n-n heterojunction exhibited the highest photocatalytic effect among all as-prepared samples, with a photocatalytic effect 5 times higher than pure Mo2S3. The presence of Bi2O2CO3 and the synergistic interactions of n-n heterojunction significantly reduced the dispersity of short-rod shaped Mo2S3, as well as the recombination of photogenerated charge carriers. As a result, electron circulation was improved, and photocatalytic hydrogen evolution activity under visible light was improved. In addition to improving the photocatalytic hydrogen evolution effect, the composite Mo2S3/Bi2O2CO3 has been found to have excellent stability, which is a noteworthy feature. A series of characterization results and semiconductor energy band structure were used to investigate the possible photocatalytic hydrogen evolution mechanism in the Eosin-Y (EY) sensitized Mo2S3/Bi2O2CO3 system.
Published Version
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