Electronic Tuning of Metal Nanoparticles for Highly Efficient Photocatalytic Hydrogen Peroxide Production
Electronic Tuning of Metal Nanoparticles for Highly Efficient Photocatalytic Hydrogen Peroxide Production
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DOI：
10.1021/acscatal.8b03738
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发表时间：
2019-01-01
期刊：
影响因子：
12.9
通讯作者：
Kim, Jae-Hong
中科院分区：
文献类型：
--
作者：
Chu, Chiheng;Huang, Dahong;Kim, Jae-Hong
我们在这里提出了一种创新的方法来增加负载在TiO 2光催化剂上的金属Pd纳米颗粒的电子密度，通过配位Pd与表面锚定的有机配体。X射线光电子能谱和X射线吸收近边结构测量证实了由配体的胺基的电子捐赠引起的Pd纳米颗粒上的负电荷。电子改性的Pd/TiO 2表现出前所未有的高光催化H2 O2生产从O-2还原。机理研究表明，增强的性能结果从电子调谐的Pd纳米粒子，导致增强的电荷分离的TiO 2支持，提高活性的Pd纳米粒子作为氧还原中心，和提高的选择性O-2还原产生H2 O2。
We here present an innovative approach to increase the electron density of metallic Pd nanoparticles loaded on TiO2 photo catalysts by coordinating Pd with surface-anchored organic ligands. X-ray photoelectron spectroscopy and X-ray absorption near edge structure measurements confirm the negative charge on the Pd nanoparticle induced by electron donation from amine groups of the ligands. The electronically modified Pd on TiO2 exhibits unprecedentedly high photocatalytic H2O2 production from O-2 reduction. Mechanistic investigations suggest that the enhanced performance results from electronic tuning of Pd nanoparticles, leading to enhanced charge separation on the TiO2 support, improved activity of Pd nanoparticles as an oxygen reduction center, and improved selectivity for O-2 reduction to produce H2O2.