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294 results on '"Chen, Shanyong"'

32. Coupling Nano and Atomic Electric Field Confinement for Robust Alkaline Oxygen Evolution.

Author

Wang, Qiyou, Gong, Yujie, Zi, Xin, Gan, Lei, Pensa, Evangelina, Liu, Yuxiang, Xiao, Yusen, Li, Hongmei, Liu, Kang, Fu, Junwei, Liu, Jun, Stefancu, Andrei, Cai, Chao, Chen, Shanyong, Zhang, Shiguo, Lu, Ying‐Rui, Chan, Ting‐Shan, Ma, Chao, Cao, Xueying, and Cortés, Emiliano

Subjects
ELECTRIC fields, DENSITY functionals, OXYGEN evolution reactions, FINITE element method, DENSITY functional theory
Abstract

The alkaline oxygen evolution reaction (OER) is a promising avenue for producing clean fuels and storing intermittent energy. However, challenges such as excessive OH− consumption and strong adsorption of oxygen‐containing intermediates hinder the development of alkaline OER. In this study, we propose a cooperative strategy by leveraging both nano‐scale and atomically local electric fields for alkaline OER, demonstrated through the synthesis of Mn single atom doped CoP nanoneedles (Mn SA‐CoP NNs). Finite element method simulations and density functional theory calculations predict that the nano‐scale local electric field enriches OH− around the catalyst surface, while the atomically local electric field improves *O desorption. Experimental validation using in situ attenuated total reflection infrared and Raman spectroscopy confirms the effectiveness of the nano‐scale and atomically electric fields. Mn SA‐CoP NNs exhibit an ultra‐low overpotential of 189 mV at 10 mA cm−2 and stable operation over 100 hours at ~100 mA cm−2 during alkaline OER. This innovative strategy provides new insights for enhancing catalyst performance in energy conversion reactions. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Rational design of type-I photosensitizer molecules for mitochondrion-targeted photodynamic therapy.

Author

Liang, Jiaxin, Ran, Xiaoyun, Liu, Yanhong, Yu, Xiaoqi, Chen, Shanyong, and Li, Kun

Abstract

Photodynamic therapy (PDT) has emerged as a promising approach for tumor treatment. However, traditional type II PDT faces limitations due to its oxygen-dependent nature. Type-I photosensitizers (PSs) exhibit superiority over conventional type-II PSs owing to their diminished oxygen dependence. Nevertheless, designing effective type-I PSs remains a significant challenge. In this work, we provide a novel strategy to tune the PDT mechanism of an excited photosensitizer through aryl substituent engineering. Using S-rhodamine as the base structure, three PSs were synthesized by incorporating phenyl, furyl, or thienyl groups at the meso position. Interestingly, furyl- or thienyl-substituted S-rhodamine are type-I-dominated PSs that produce O2˙−, while phenyl S-rhodamine results in O2˙− and 1O2 through type-I and type-II mechanisms, respectively. Experimental analyses and theoretical calculations showed that the introduction of a five-membered heterocycle at the meso position promoted intersystem crossing (ISC) and electron transfer, facilitating the production of O2˙−. Furthermore, furyl- or thienyl-substituted S-rhodamine exhibited high phototoxicity at ultralow concentrations. Thienyl-substituted S-rhodamine showed promising PDT efficacy against hypoxic solid tumors. This innovative strategy provides an alternative approach to developing new type-I PSs without the necessity for creating entirely new skeletons. [ABSTRACT FROM AUTHOR]

Published
2024
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