Photocatalytic Overall Water Splitting under Visible Light Using ATaO2N (A = Ca, Sr, Ba) and WO3 in a IO3-/I- Shuttle Redox Mediated System
Photocatalytic Overall Water Splitting under Visible Light Using ATaO2N (A = Ca, Sr, Ba) and WO3 in a IO3-/I- Shuttle Redox Mediated System
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DOI：
10.1021/cm803145n
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发表时间：
2009-04-28
影响因子：
8.6
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Higashi, Masanobu;Abe, Ryu;Domen, Kazunari
在NH_3气氛下加热非晶态A（2）Ta（2）O（7）制备了三种混合氮氧化钽（ATaO（2）N（A = Ca，Sr，Ba）），并将其应用于两步光激发水分解体系中作为光催化剂进行了析氢实验。载铂CaTaO 2N和BaTaO 2N被证明是积极的H-2的演变在甲醇或I-作为电子供体的存在下，而SrTaO 2N是无法产生H-2稳定在I-的存在下，由于自氧化分解伴随着N-2的生产。Pt-CaTaO 2 N或Pt-BaTaO 2 N与Pt-WO 3的组合实现了在可见光照射下的整体水分解。Pt-BaTaO 2N也被证明在高达660 nm的波长下是光活性的，代表了整个水分解系统的第一个例子，其中波长大于600 nm的可见光被有效地用于H-2的释放。
Three mixed tantalum oxynitrides, ATaO(2)N (A = Ca, Sr, Ba), prepared by heating amorphous A(2)Ta(2)O(7) under NH3, are applied in a two-step photoexcitation water-splitting system as a photocatalyst for H-2 evolution. Platinum-loaded CaTaO2N and BaTaO2N are demonstrated to be active for H-2 evolution in the presence of methanol or I- as an electron donor, whereas SrTaO2N is unable to produce H-2 stably in the presence of I- due to self-oxidative decomposition accompanied by N-2 production. The combination of Pt-CaTaO2N or Pt-BaTaO2N with Pt-WO3 achieves overall water splitting under visible irradiation. Pt-BaTaO2N is also demonstrated to be photoactive at wavelengths up to 660 nm, representing the first example of an overall water-splitting system in which visible light at wavelengths longer than 600 nm is effectively utilized for H-2 evolution.