Roles of Rh/Cr2O3 (core/shell) nanoparticles photodeposited on visible-light-responsive (Ga1-xZnx)(N1-xOx) solid solutions in photocatalytic overall water splitting
Roles of Rh/Cr2O3 (core/shell) nanoparticles photodeposited on visible-light-responsive (Ga1-xZnx)(N1-xOx) solid solutions in photocatalytic overall water splitting
复制标题
DOI：
10.1021/jp071056j
复制
发表时间：
2007-05-24
影响因子：
3.7
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Maeda, Kazuhiko;Teramura, Kentaro;Domen, Kazunari
研究了光沉积Rh/Cr2 O3（核/壳）纳米粒子在（Ga 1-xZn x）（N1-xOx）光催化剂上作为整体水裂解的助催化剂。用可见光（λ> 400 nm）照射K2 CrO 4水溶液中的Rh负载的（Ga 1-xZnx）（N1-xOx），通过CrO 42-阴离子在Rh纳米颗粒上的选择性光还原生成Cr2 O3，形成由Rh核和Cr2 O3壳组成的核/壳结构纳米颗粒。壳层厚度随K_2CrO_4浓度的增加而增加，最大值约为0.001mm。2 nm，在此温度下可获得均匀的Cr2 O3涂层。Cr2 O3壳层抑制Rh纳米颗粒上H-2和O-2形成水，从而实现纯水的化学计量分解。与裸Rh纳米颗粒相比，核/壳结构还提供增强的H-2释放。
Photodeposited Rh/Cr2O3 (core/shell) nanoparticles on a (Ga1-xZnx)(N1-xOx) photocatalyst are studied as a cocatalyst for overall water splitting. Irradiation of Rh-loaded (Ga1-xZnx)(N1-xOx) with visible light (lambda > 400 nm) in aqueous K2CrO4 solution results in the formation of core/shell-structured nanoparticles consisting of a Rh core and Cr2O3 shell through the site-selective photoreduction of CrO42- anions to Cr2O3 on Rh nanoparticles. The shell thickness increases with concentration of K2CrO4 in the reactant solution to a maximum of ca. 2 nm, at which a uniform Cr2O3 coating is obtained. The Cr2O3 shell suppresses water formation from H-2 and O-2 on Rh nanoparticles, allowing stoichiometric decomposition of pure water to be achieved. The core/shell structure also provides enhanced H-2 evolution compared to that of bare Rh nanoparticles.