The effect of surface strain on the CO-poisoned surface of Pt electrode for hydrogen adsorption

He, Jia; Shen, Yongli; Yang, Mingzhu; Zhang, Haixia; Deng, Qibo; Ding, Yi

doi:10.1016/j.jcat.2017.04.004

Cited by 32 publications

(22 citation statements)

References 31 publications

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“…Thus, CO may be considered a poison for the platinum catalyst. This phenomenon plays a very negative role in some catalytic processes, for example in NO x reduction with H 2 or in anodic hydrogen oxidation in proton exchange membrane fuel cells (PEM) [28][29][30]. Thus, the platinum surface can be completely poisoned by CO and in this state there are no free adsorption centers.…”

Section: The Activity Tests and Overall Discussionmentioning

confidence: 99%

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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This paper reports that Pt/TiO 2 and to some extent, Pt/Al 2 O 3 and Pt/SiO 2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (\ 100°C) in the absence of oxygen. For Pt/TiO 2 catalysts, CO conversion is dependent on the Pt loading as well as the temperature of their reduction. There are an optimal platinum loading (5 wt%) and catalyst reduction temperature (500°C) ensuring the best photocatalytic efficiency. Catalytic performance results from the combined effects of electron-hole photogeneration and partial photodesorption of CO from the platinum surface, followed by the adsorption and subsequent dissociation of H 2 O. The probable mechanism of photooxidation of CO by H 2 O was proposed.

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Section: The Activity Tests and Overall Discussionmentioning

confidence: 99%

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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“…It is widely known that CO is strongly adsorbed on Pt and the adsorbed CO inhibits the subsequent reaction, which is called CO poisoning. [48][49][50][51][52][53] Therefore, we can say that the reaction proceeds easily on the Pt oxide because the CO 2 electroreduction reaction did not proceed through CO. This is suggested from the difference in activation energies.…”

Section: In-situ Seiras Analysis Of Co 2 Electroreduction On Pt Andmentioning

confidence: 99%

In-situ Analysis of CO<sub>2</sub> Electroreduction on Pt and Pt Oxide Cathodes

et al. 2020

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The issue of excessive amounts of CO 2 in the atmosphere has promoted the study of methods of removing it from the atmosphere. In the field of electrochemistry, electroreduction of CO 2 has become an area of significant scientific interest. Our previous work has shown Pt oxide exhibits a higher CO 2 electroreduction activity than Pt. In this study, the surface adsorption species on Pt and Pt oxide during electroreduction were investigated with SEIRAS to clarify the mechanisms of the superior electroreduction activity of Pt oxide. The main adsorption species during CO 2 electroreduction were methanol and HCOO − on the Pt oxide, and methanol and linear-CO on the Pt. We confirmed that the CO 2 electroreduction reaction proceeds via HCOO − on Pt oxide, and through CO on Pt. The CO 2 electroreduction activity is significantly affected by the adsorption species because CO strongly adsorbs on the active site and inhibits subsequent reactions. The residual oxygen in the reduced Pt oxide electrode may cause the difference in adsorption species, controlling the reaction pathway. We conclude that the superior CO 2 electroreduction activity of Pt oxide is due to the difference in the reaction pathway, possibly caused by residual oxygen and oxygen vacancies in the Pt oxide electrode.

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“…14 On one hand, the adsorbate-metal interaction strength can be well controlled by strain. [15][16][17][18] On the other hand, the strained surfaces may rearrange more easily upon strong adsorption. 19 Thus, the conventional models using perfect unstrained surfaces to represent nanocatalysts may no longer be relevant.…”

Section: Introductionmentioning

confidence: 99%