Operando Laboratory X-ray Absorption Spectroscopy and UV-Vis Study of Pt/TiO2 Photocatalysts during Photodeposition and Hydrogen Evolution Reactions

被引：9

作者：

Kozyr, Elizaveta G. ^{[1
,2
]}

Njoroge, Peter N. ^{[1
]}

Chapek, Sergei V. ^{[1
]}

Shapovalov, Viktor V. ^{[1
]}

Skorynina, Alina A. ^{[1
]}

Pnevskaya, Anna Yu. ^{[1
]}

Bulgakov, Alexey N. ^{[1
]}

Soldatov, Alexander V. ^{[1
]}

Pellegrino, Francesco ^{[2
]}

Groppo, Elena ^{[2
]}

Bordiga, Silvia ^{[2
]}

Mino, Lorenzo ^{[2
]}

Bugaev, Aram L. ^{[1
,3
]}

机构：

[1] Southern Fed Univ, Smart Mat Res Inst, Sladkova 178-24, Rostov Na Donu 344090, Russia

[2] Univ Turin, Dept Chem, Via Giuria 7, I-10125 Turin, Italy

[3] Paul Scherrer Inst, Forschungsstr 111, CH-5232 Villigen, Switzerland

来源：

CATALYSTS | 2023年 / 13卷 / 02期

关键词：

operando spectroscopy; XANES; photocatalysis; platinum catalyst; UV-Vis; HER; photodeposition; ACTIVE-SITE; NANOPARTICLES; OXIDATION; XAFS; CELL;

D O I：

10.3390/catal13020414

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Photocatalytic hydrogen (H-2) production is a promising route for alternative energetics. Understanding structure-activity relationships is a crucial step towards the rational design of photocatalysts, which requires the application of operando spectroscopy under relevant working conditions. We performed an operando investigation on a catalytic system during the photodeposition of Pt on TiO2 and photostimulated H-2 production, using simultaneous laboratory X-ray absorption spectroscopy (XAS), UV-Vis spectroscopy, and mass spectrometry. XAS showed a progressive increase in Pt fluorescence for Pt deposited on TiO2 for over an hour, which is correlated with the signal of the produced H-2. The final Pt/TiO2 catalyst contained Pt(0) particles. The electronic features corresponding to the Pt4+ species in the UV-Vis spectrum of the solution disappear as soon as UV radiation is applied in the presence of formic acid, which acts as a hole scavenger, resulting in the presence of Pt(0) particles in solution.

引用

页数：10

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