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826 results on '"Pan, Mu"'

1. Pore-Scale Modeling of Microporous Layer for Proton Exchange Membrane Fuel Cell: Effective Transport Properties

Author

Zhang, Heng, Shao, Xuanyu, Zhan, Zhigang, Sarker, Mrittunjoy, Sui, Pang-Chieh, Chuang, Po-Ya Abel, and Pan, Mu

Subjects
Engineering, Materials Engineering, microporous layer, stochastic numerical method, transport properties, pore scale model, Lattice Boltzmann method, compression strain, Chemical Engineering, Civil Engineering, Environmental Engineering, Chemical engineering, Environmental engineering
Abstract

A microporous layer (MPL) is a transition layer with a porous material structure, located between the gas diffusion layer (GDL) and catalyst layer (CL) in a proton exchange membrane fuel cell (PEMFC). It not only significantly improves electron transfer and heat conduction in membrane electrode assembly, but also effectively manages liquid water transport to enhance the fuel cell performance. The MPL is usually coated on one side of the GDL. The fragile nature of MPL makes it challenging to characterize the effective transport properties using experimental methods. In this study, a stochastic numerical method is implemented to reconstruct the three-dimensional microstructure of an MPL consisting of carbon particles and PTFE. The reliability of the MPL reconstructed model is validated using experimental data. The relationship between the effective transport properties and the compression strain is obtained using the Pore Scale Model (PSM), while the relationship between the liquid water saturation and capillary pressure is solved by Lattice Boltzmann Method (LBM). The effective transport properties in the MPL are then imported into the two-phase flow fuel cell model. It is found that the effective transport parameters in MPL obtained by PSM and LBM can improve the accuracy of the model calculation. This study provides an effective method to reconstruct the microstructure of MPL that can generate precise MPL transport parameters for utilization in various PEMFC performance prediction models.

Published
2023

16. Hydrogen sulfide functions as a micro-modulator bound at the copper active site of Cu/Zn-SOD to regulate the catalytic activity of the enzyme

Author

Dong-Dong Wu, Sheng Jin, Ruo-Xiao Cheng, Wen-Jie Cai, Wen-Long Xue, Qing-Qing Zhang, Le-Jie Yang, Qi Zhu, Meng-Yao Li, Ge Lin, Yi-Zhen Wang, Xue-Pan Mu, Yu Wang, Igor Ying Zhang, Qi Zhang, Ying Chen, Sheng-Yang Cai, Bo Tan, Ye Li, Yun-Qian Chen, Pu-Juan Zhang, Chen Sun, Yue Yin, Ming-Jie Wang, Yi-Zhun Zhu, Bei-Bei Tao, Jia-Hai Zhou, Wei-Xue Huang, and Yi-Chun Zhu

Subjects
CP: Molecular biology, Biology (General), QH301-705.5
Abstract

Summary: The present study examines whether there is a mechanism beyond the current concept of post-translational modifications to regulate the function of a protein. A small gas molecule, hydrogen sulfide (H2S), was found to bind at active-site copper of Cu/Zn-SOD using a series of methods including radiolabeled binding assay, X-ray absorption near-edge structure (XANES), and crystallography. Such an H2S binding enhanced the electrostatic forces to guide the negatively charged substrate superoxide radicals to the catalytic copper ion, changed the geometry and energy of the frontier molecular orbitals of the active site, and subsequently facilitated the transfer of an electron from the superoxide radical to the catalytic copper ion and the breakage of the copper-His61 bridge. The physiological relevance of such an H2S effect was also examined in both in vitro and in vivo models where the cardioprotective effects of H2S were dependent on Cu/Zn-SOD.

Published
2023
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