Novel Heterostructure as a H2-Evolving Photocatalyst Boosting the Z-Scheme Overall Water Splitting Performance under Visible Light Irradiation

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Yu Qi, Yuanfeng Zhu, Tengfeng Xie, Fuxiang Zhang
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引用次数: 0

Abstract

Tantalum nitride (Ta3N5) has been widely investigated as an extremely promising photocatalyst or photoanode for solar water splitting, but its performance is blocked by inefficient charge separation regardless of using a one-step or two-step excitation method. Here, we demonstrate significantly enhanced proton reduction on the particulate Ta3N5 photocatalyst with an effort for the promotion of charge separation via forming a solid solution-based heterostructure composite. One-pot nitridation was adopted to synthesize this novel heterostructure, which is composed of Ta3N5 and BaZrO3–BaTaO2N solid solution. The as-obtained composite (BaZrO3–BaTaO2N/Ta3N5) is found to exhibit superior charge separation and transfer ability compared with Ta3N5 and BaZrO3–BaTaO2N. As a result, the visible-light-driven Z-scheme overall water splitting (OWS) activity using the optimal BaZrO3–BaTaO2N/Ta3N5 composite as the H2-evolving photocatalyst can be promoted by about 20 times. This work not only gives the first example to fabricate heterostructures based on solid solution for enhanced charge separation but also offers a new avenue to improve the photocatalytic OWS performance of Ta3N5.

Abstract Image

新型异质结构光催化剂在可见光照射下提高Z-Scheme整体水分解性能
氮化钽(Ta3N5)作为一种极具前景的太阳能水分解光催化剂或光阳极被广泛研究,但无论是采用一步激发法还是两步激发法,其性能都受到电荷分离效率低下的阻碍。在这里,我们证明了粒子Ta3N5光催化剂上质子还原的显著增强,并通过形成基于固溶体的异质结构复合材料来促进电荷分离。采用一锅氮化法制备了由Ta3N5和BaZrO3-BaTaO2N固溶体组成的新型异质结构。与Ta3N5和BaZrO3-BaTaO2N相比,所制得的复合材料(BaZrO3-BaTaO2N /Ta3N5)具有更好的电荷分离和转移能力。结果表明,采用最佳的BaZrO3-BaTaO2N /Ta3N5复合材料作为h2演化光催化剂,可见光驱动的Z-scheme整体水分解(OWS)活性可提高约20倍。这项工作不仅首次实现了基于固溶体制备异质结构以增强电荷分离,而且为提高Ta3N5光催化OWS性能提供了新的途径。
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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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