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Fine synthesis of photocatalitic thin films based on oxynitrides for water splitting with high efficiency

基于氮氧化物的光触媒薄膜的精细合成用于高效分解水

基本信息

批准号：
17206081
负责人：
DOMEN Kazunari
金额：
$ 31.62万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206081/
关键词：
oxynitride photocatalyst thin film photochemical cells visible light hydrogen production photoelectric conversion device

项目摘要

The hydrogen production by a photocatalyst from sunlight and water is a potential approach to solve the energy problems essentially. The purpose of this projict is the development of photocatalitic films based on d^0 and/of d^10 group (oxy)nitrides for water splitting under visible light illumination without bias voltage. First, we carried out the development of photoelectrode based on a solid solution of GaN and ZnO. The photoelectrodes were prepared by pasting (Ga_<1x>Zn_x)(N_<1x>O_x) powder onto conducting glass. We intensively surveyed the effects of surface modification. As a result, we found that photocurrent is extremely enhanced by the loading of IrO_2 as a cocatalyst. Moreover, the gas evolved from the photoelectrode was found to be O_2, while the gas evolved from the counter electrode was found to be H_2. The amount of evolved gases is consistent with the photocurrent. Next, we expanded target materials in oxysulfide. Sulfides are known as a photofunctional material. They are, however, generally unstable in water and believed to be unsuitable for a photocatalyst in water. We explore the potential possibilities of oxysulfides as a photocatalyst in water. We found that La_5Ti_2AgS_5O_7 have promising potential for H_2 production from water. Photoelectrodes were prepared by pasting powder and/or by RF magnetron sputtering on conducting substrates. By photoelectrochemical measurements, La_5Ti_2AgS_5O_7 was found to p-type semiconductor. P-type photoelectrodes are expected to evolve H_2 without self-degradation. These photoelectrodes have practical potential to produce H_2 and O_2 from water and sunlight, and more extensive studies are required.

利用光催化剂分解太阳光和水制氢是从根本上解决能源问题的一条潜在途径。本项目的目的是开发基于d^0和/或d^10族氮氧化物的光催化膜，用于在无偏压的情况下在可见光照射下分解水。首先，我们进行了基于GaN和ZnO的固溶体的光电极的开发。将（Ga_<1x>Zn_x）（N_<1x>O_x）粉末粘贴在导电玻璃上制备光电极。我们深入研究了表面改性的效果。结果表明，IrO_2作为助催化剂的负载极大地增强了光电流。此外，从光电极放出的气体被发现是O_2，而从对电极放出的气体被发现是H_2。放出气体的量与光电流一致。接下来，我们在硫氧化物中扩展了目标材料。硫化物被称为光功能材料。然而，它们通常在水中不稳定，并且被认为不适合用于水中的光催化剂。我们探讨了氧硫化物作为光催化剂在水中的潜在可能性。发现La_5Ti_2AgS_5O_7具有很好的制氢潜力。光电极通过在导电基底上粘贴粉末和/或通过RF磁控溅射来制备。光电化学测试表明La_5Ti_2AgS_5O_7为p型半导体。P型光电极有望在不发生自降解的情况下放出H_2。这些光电极具有利用水和太阳光产生H_2和O_2的实用潜力，还需要进行更广泛的研究。