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具有异质掺杂结构的纯CeO与Y掺杂CeO界面处光激发电荷的高效分离用于光催化全水分解

Efficient Separation of Photoexcited Charge at Interface between Pure CeO and Y-Doped CeO with Heterogonous Doping Structure for Photocatalytic Overall Water Splitting.

作者信息

Hou Honghao, Yamada Hirohisa, Nitta Atsumi, Murakami Yoshinori, Saito Nobuo

机构信息

Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka 940-2188, Japan.

Department of Chemical Engineering, National Institute of Technology Nara College, Nara 639-1080, Japan.

出版信息

Materials (Basel). 2021 Jan 12;14(2):350. doi: 10.3390/ma14020350.

DOI:10.3390/ma14020350
PMID:33445720
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7828182/
Abstract

Enhancement of photoexcited charge separation in semiconductor photocatalysts is one of the important subjects to improve the efficiency of energy conversion for photocatalytic overall water splitting into H and O. In this study, we report an efficient separation of photoexcited charge at the interface between non-doped pure CeO and Y-doped CeO phases on particle surfaces with heterogeneous doping structure. Neither non-doped pure CeO and homogeneously Y-doped CeO gave activities for photocatalytic H and O production under ultraviolet light irradiation, meaning that both single phases showed little activity. On the other hand, Y-heterogeneously doped CeO of which the surface was composed of non-doped pure CeO, and Y-doped CeO phases exhibited remarkable photocatalytic activities, indicating that the interfacial heterostructure between non-doped pure CeO and Y-doped CeO phases plays an important role for the activation process. The role of the interface between two different phases for activated expression was investigated by selective photo-reduction and oxidation deposition techniques of metal ion, resulting that the interface between two phases become an efficient separation site of photoexcited charge. Electronic band structures of both phases were investigated by the spectroscopic method, and then a mechanism of charge separation is discussed.

摘要

增强半导体光催化剂中的光激发电荷分离是提高光催化全分解水制氢和氧能量转换效率的重要课题之一。在本研究中，我们报道了在具有异质掺杂结构的颗粒表面，非掺杂纯CeO和Y掺杂CeO相之间的界面处光激发电荷的有效分离。在紫外光照射下，非掺杂纯CeO和均匀Y掺杂CeO均未表现出光催化产氢和产氧活性，这意味着单相均几乎没有活性。另一方面，表面由非掺杂纯CeO和Y掺杂CeO相组成的Y异质掺杂CeO表现出显著的光催化活性，表明非掺杂纯CeO和Y掺杂CeO相之间的界面异质结构在活化过程中起重要作用。通过金属离子的选择性光还原和氧化沉积技术研究了两种不同相之间的界面在活化表达中的作用，结果表明两相之间的界面成为光激发电荷的有效分离位点。通过光谱方法研究了两相的电子能带结构，进而讨论了电荷分离的机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/601cd52a71b4/materials-14-00350-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/29f0f1c1d56c/materials-14-00350-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/f3177739f9f7/materials-14-00350-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/b4d2e427155c/materials-14-00350-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/516ea7fa2778/materials-14-00350-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/b367fd958fa2/materials-14-00350-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/aec8ecfbdcd3/materials-14-00350-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/601cd52a71b4/materials-14-00350-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/29f0f1c1d56c/materials-14-00350-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/1b58b1b9f3aa/materials-14-00350-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/f3177739f9f7/materials-14-00350-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/b4d2e427155c/materials-14-00350-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/516ea7fa2778/materials-14-00350-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/b367fd958fa2/materials-14-00350-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/aec8ecfbdcd3/materials-14-00350-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4dea/7828182/601cd52a71b4/materials-14-00350-g008.jpg

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