Soontornchaiyakul Wasusate, Fujimura Takuya, Yano Natsumi, Kataoka Yusuke, Sasai Ryo
Department of Physics and Materials Science, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060, Nishikawatsu-cho, Matsue 690-8504, Shimane, Japan.
Graduate School of Natural Science and Technology, Shimane University, 1060, Nishikawatsu-cho, Matsue 690-8504, Shimane, Japan.
ACS Omega. 2020 Apr 22;5(17):9929-9936. doi: 10.1021/acsomega.0c00204. eCollection 2020 May 5.
Various amounts of Rh-doped titanate nanosheets (TiNS:Rh(), where is doped amount) were prepared to develop a new nanostructured photocatalyst based on metal oxide compounds that can split water to produce H under sunlight. TiNS:Rh() was obtained by acid exchange, intercalation, and exfoliation of Rh-doped layered sodium titanate compound (NaTi Rh O). A new energy gap was found in the diffuse reflection spectrum of the TiNS:Rh() colloidal suspension solution; this new energy gap corresponds to electrons in the 4d level of Rh or Rh, which are doped in the Ti site. A photocatalyst activity of TiNS:Rh() for H evolution in water with triethylamine (TEA) as an electron donor was investigated. The appropriate amount of Rh doping can improve the photocatalytic activity of TiNS for H evolution from water using triethylamine (TEA) as a sacrifice agent. The reason was related to the rich state of Rh or Rh doped in the Ti site of TiNS. Doping Rh 1 mol % of Ti, TiNS:Rh(0.03) shows the H evolution rates up to 1040 nmol/h, which is about 25 times larger than that of nondoped TiNS under UV irradiation (>220 nm) and 302 nmol/h under near-UV irradiation (>340 nm). These results show that the development of new nanostructured photocatalyst based on Rh-doped titanate compounds that can produce H under near-UV irradiation present in sunlight was a success.
制备了不同含量的铑掺杂钛酸盐纳米片（TiNS:Rh( )，其中 为掺杂量），以开发一种基于金属氧化物化合物的新型纳米结构光催化剂，该催化剂能够在阳光下分解水产生氢气。TiNS:Rh( )是通过对铑掺杂的层状钛酸钠化合物（NaTi Rh O）进行酸交换、插层和剥离而获得的。在TiNS:Rh( )胶体悬浮溶液的漫反射光谱中发现了一个新的能隙；这个新能隙对应于掺杂在钛位点的铑或铑的4d能级中的电子。研究了以三乙胺（TEA）作为电子供体时，TiNS:Rh( )在水中产生氢气的光催化活性。适量的铑掺杂可以提高TiNS以三乙胺（TEA）作为牺牲剂从水中产生氢气的光催化活性。原因与掺杂在TiNS钛位点的铑或铑的丰富状态有关。当铑掺杂量为钛的1 mol%时，TiNS:Rh(0.03)在紫外光照射（>220 nm）下的产氢速率高达1040 nmol/h，约为未掺杂TiNS的25倍，在近紫外光照射（>340 nm）下为302 nmol/h。这些结果表明，基于铑掺杂钛酸盐化合物开发的新型纳米结构光催化剂在阳光中存在的近紫外光照射下能够产生氢气是成功的。
