Ag(I) and Cu(I) ions were exchanged for alkali ions in various wide-band-gap metal oxides with layered and tunneling structures for sensitization to visible light. Crystal structures of many Cu(I)-ion-exchanged materials were similar to those of Ag(I)-ion-exchanged materials when the same host materials were used. The ion-exchanged materials possessed new absorption bands at longer wavelength regions than their host materials because of contributions of Ag 4d and Cu 3d orbitals to the valence band maxima of the ion-exchanged materials. Some Ag(I)-ion-exchanged materials, Ag(I)-A₂SrTa₂O₇ (A = Li, K), Ag(I)-K₂SrNb_0.2Ta_1.8O₇, Ag(I)-K₂CaNaNb₃O₁₀, and Ag(I)-KLaNb₂O₇ showed activities for photocatalytic O₂ evolution from an aqueous solution containing a sacrificial electron acceptor under visible-light irradiation. When Ruddlesden–Popper-type layered perovskite metal oxides consisting of Ti(IV) or Ta(V) in the perovskite slabs and K(I) in the interlayers were used as a host material, the Cu(I)-ion-exchanged materials showed high activities for photocatalytic H₂ evolution from an aqueous solution containing sacrificial electron donors under visible-light irradiation. On the other hand, when the other host materials were used as a host material, almost all Cu(I)-ion-exchanged materials hardly showed the activities. The Cu(I)-ion-exchanged metal oxides with a tunneling structure (Li₂MSr₆O₁₄ (M = Na₂, Sr, Ba, Pb)) instead of layered materials were successfully synthesized and responded to visible light.

中文翻译：

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Ag（I）和Cu（I）离子交换法利用熔融盐处理技术开发的新型可见光驱动的H ₂和O ₂演化光催化剂

在具有宽带和隧道结构的各种宽带隙金属氧化物中，Ag（I）和Cu（I）离子被碱金属离子交换，从而对可见光敏感。当使用相同的基质材料时，许多Cu（I）离子交换材料的晶体结构与Ag（I）离子交换材料的晶体结构相似。离子交换材料比其主体材料在更长的波长区域具有新的吸收带，这是因为Ag 4d和Cu 3d轨道对离子交换材料的价带最大值有贡献。一些经过Ag（I）离子交换的材料Ag（I）-A ₂ SrTa ₂ O ₇（A = Li，K），Ag（I）-K ₂ SrNb _0.2 Ta _1.8 O ₇，Ag（I）-K ₂CaNaNb ₃ O ₁₀和Ag（I）-KLaNb ₂ O ₇在可见光照射下显示出从含有牺牲电子受体的水溶液中光催化O ₂析出的活性。当由钙钛矿平板中的Ti（IV）或Ta（V）和中间层中的K（I）组成的Ruddlesden-Popper型层状钙钛矿金属氧化物用作基质材料时，Cu（I）离子交换的材料对光催化H ₂表现出高活性在可见光照射下从含有牺牲电子供体的水溶液中析出。另一方面，当将其他主体材料用作主体材料时，几乎所有的Cu（I）离子交换材料几乎都没有显示出活性。成功地合成了具有隧穿结构（Li ₂ MSr ₆ O ₁₄（M = Na ₂，Sr，Ba，Pb））而不是层状材料的Cu（I）离子交换金属氧化物，并对可见光作出了响应。