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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Roles of Rh/Cr2O3 (core/shell) nanoparticles photodeposited on visible-light-responsive (Ga1-xZnx)(N1-xOx) solid solutions in photocatalytic overall water splitting
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Roles of Rh/Cr2O3 (core/shell) nanoparticles photodeposited on visible-light-responsive (Ga1-xZnx)(N1-xOx) solid solutions in photocatalytic overall water splitting

机译：在可见光响应（Ga1-xZnx）（N1-xOx）固溶体上光沉积的Rh / Cr2O3（核/壳）纳米粒子在光催化总水分解中的作用

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摘要

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.
机译：研究了在（Ga1-xZnx）（N1-xOx）光催化剂上光沉积的Rh / Cr2O3（核/壳）纳米颗粒作为总水分解的助催化剂。在K2CrO4水溶液中用可见光（λ> 400 nm）照射Rh负载的（Ga1-xZnx）（N1-xOx），导致通过该位点形成由Rh核和Cr2O3壳组成的核/壳结构纳米粒子Rh纳米粒子上CrO42-阴离子的选择性光还原为Cr2O3。随着反应溶液中K2CrO4浓度的增加，壳层厚度增加，最大为。 2nm处，获得均匀的Cr 2 O 3涂层。 Cr2O3壳可抑制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 Rh纳米粒子相比，核/壳结构还提供了增强的H-2进化。

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