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. 2018 Apr 21;8(4):261. doi: 10.3390/nano8040261

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The hydrogen evolution rate over the pristine Bi₄Ti₃O₁₂ and the Bi₄Ti₃O_12−x after chemical reduction treated (a) at 350 °C for various times; (b) at various temperature for 60 min under visible-light irradiation (λ > 400 nm); (c) recycling measure of hydrogen evolution with Bi₄Ti₃O_12−x (350 °C, 60 min) under visible-light irradiation (λ > 400 nm); (d) visible-light photocatalytic hydrogen evolution by fresh Bi₄Ti₃O_12−x (350 °C, 60 min) and Bi₄Ti₃O_12−x (350 °C, 60 min) after four months of storage, compared with the pristine Bi₄Ti₃O₁₂.