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Highly stable preferential carbon monoxide oxidation by dinuclear heterogeneous catalysts

https://doi.org/10.1073/pnas.2206850120

Zhao, Yanyan ; Dai, Sheng ; Yang, Ke R. ; Cao, Sufeng ; Materna, Kelly L. ; Lant, Hannah M. ; Kao, Li Cheng ; Feng, Xuefei ; Guo, Jinghua ; Brudvig, Gary W. ; et al ( January 2023 , Proceedings of the National Academy of Sciences)

Atomically dispersed catalysts have been shown highly active for preferential oxidation of carbon monoxide in the presence of excess hydrogen (PROX). However, their stability has been less than ideal. We show here that the introduction of a structural component to minimize diffusion of the active metal center can greatly improve the stability without compromising the activity. Using an Ir dinuclear heterogeneous catalyst (DHC) as a study platform, we identify two types of oxygen species, interfacial and bridge, that work in concert to enable both activity and stability. The work sheds important light on the synergistic effect between the active metal center and the supporting substrate and may find broad applications for the use of atomically dispersed catalysts.
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Operando leaching of pre-incorporated Al and mechanism in transition-metal hybrids on carbon substrates for enhanced charge storage

https://doi.org/10.1016/j.matt.2021.06.035

Guo, Wei ; Yang, Feipeng ; Yu, Chang ; Xie, Yuanyang ; Chen, Jiuke ; Liu, Yisheng ; Zhao, Yang ; Yang, Juan ; Feng, Xuefei ; Li, Shaofeng ; et al ( September 2021 , Matter)

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Probing calcium solvation by XAS, MD and DFT calculations

https://doi.org/10.1039/d0ra05905f

Yang, Feipeng ; Liu, Yi-Sheng ; Feng, Xuefei ; Qian, Kun ; Kao, Li Cheng ; Ha, Yang ; Hahn, Nathan T. ; Seguin, Trevor J. ; Tsige, Mesfin ; Yang, Wanli ; et al ( July 2020 , RSC Advances)

The solvation shell structures of Ca 2+ in aqueous and organic solutions probed by calcium L-edge soft X-ray absorption spectroscopy (XAS) and DFT/MD simulations show the coordination number of Ca 2+ to be negatively correlated with the electrolyte concentration and the steric hindrance of the solvent molecule. In this work, the calcium L-edge soft XAS demonstrates its sensitivity to the surrounding chemical environment. Additionally, the total electron yield (TEY) mode is surface sensitive because the electron penetration depth is limited to a few nanometers. Thus this study shows its implications for future battery studies, especially for probing the electrolyte/electrode interface for electrochemical reactions under in situ /operando conditions.
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