X射线光电子能谱
锐钛矿
光催化
铂金
零电荷点
吸附
催化作用
材料科学
氢
制氢
化学工程
分析化学(期刊)
化学
纳米技术
物理化学
有机化学
工程类
作者
Kenza Toukabri,Seyedsina Hejazi,Majid Shahsanaei,Sadegh Pour-Ali,Ali Kosari,Benjamin Butz,Manuela S. Killian,Shiva Mohajernia
出处
期刊:Langmuir
[American Chemical Society]
日期:2024-02-20
卷期号:40 (9): 4661-4668
被引量:1
标识
DOI:10.1021/acs.langmuir.3c03316
摘要
Single-atom (SA) decoration has emerged as a frontier in catalysis due to its unique characteristics. Recently, decorated Pt single atoms on titania have shown promise in photocatalytic hydrogen evolution. In this work, we demonstrate that Pt SAs can spontaneously deposit on the surface, driven by electrostatic forces; the key is to determine the golden pH and surface potential. We conducted a comprehensive investigation into the influence of the pH of the deposition precursor on the spontaneous adsorption of Pt SAs onto TiO2 nanosheets (TiNSs). We introduced a straightforward pH-dependent and charge-dependent strategy for the solid electrostatic anchoring of Pt SAs on TiO2. Furthermore, we established that the level of Pt loading can be controlled by adjusting the precursor pH. X-ray photoelectron spectroscopy (XPS) and high-angle annular dark-field imaging scanning transmission electron microscopy (HAADF-STEM) were used to evaluate the Pt SA-decorated samples. Photocatalytic hydrogen production activity was assessed under ultraviolet (UV) (365 nm) irradiation. Notably, we found that at a pH of 8, slightly below the measured point of zero charge (PZC), a unique mixture of Pt clusters and single atoms was deposited on the surface of TiNSs. This unique composition significantly improved hydrogen production, resulting in ∼3.7 mL of hydrogen generated after 8 h of UV exposure by only 10 mg of the Pt-decorated TiNS (with Pt loadings of 0.12 at. %), which is ∼300 times higher than the undecorated TiNS.
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