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3 results on '"Saifei Pan"'

1. A New Integrated GDL with Wavy Channel and Tunneled Rib for High Power Density PEMFC at Low Back Pressure and Wide Humidity

Author

Can He, Qinglin Wen, Fandi Ning, Min Shen, Lei He, Yali Li, Bin Tian, Saifei Pan, Xiong Dan, Wei Li, Pengpeng Xu, Yiyang Liu, Zhi Chai, Yihuang Zhang, Wenming Liu, and Xiaochun Zhou

Subjects
integrated gas diffusion layers, low back pressure, micro‐tunnel ribs, proton exchange membrane fuel cells, wave channels, Science
Abstract

Abstract Proton exchange membrane fuel cells (PEMFCs) have garnered significant attention due to their high efficiency and low emissions. However, PEMFC always suffers mass transfer and water management in performance improvement. Herein, an integrated gas diffusion layer (GDL) with wavy channel and micro‐tunneled rib is designed and prepared to achieve faster and gentler mass transfer and excellent water management capability by laser engraving. Outstandingly, the new integrated GDL can use the back pressure of air as low as 0 and 50 kPa to respectively achieve 80% and 90% of fuel cell performance realized under pure oxygen. Such high performance is mainly due to the turbulent flow caused by wavy channel and express removing pathway of liquid water provided by micro‐tunneled rib. Moreover, the new integrated GDL also shows wide humidity tolerance from 40% to 100% and a very high specific volume power density of 16,300 W L−1 due to the thin thickness of new integrated GDL. This new integrated GDL is expected to be widely used in PEMFC and other energy conversion devices.

Published
2023
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3. Highly flat and highly homogeneous carbon paper with ultra-thin thickness for high-performance proton exchange membrane fuel cell (PEMFC)

Author

Fandi Ning, Chuang Bai, Jiafan Chen, Yali Li, Siyi Zou, Shengwei Deng, Qinglin Wen, Hanqing Jin, Xiaochun Zhou, Xuwei Fu, Jun Wei, and Saifei Pan

Subjects
Materials science, business.product_category, Renewable Energy, Sustainability and the Environment, Flatness (systems theory), Energy Engineering and Power Technology, Proton exchange membrane fuel cell, Carbon nanotube, law.invention, Chemical engineering, law, Mass transfer, Carbon paper, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Porosity, Dispersion (chemistry), business, Layer (electronics)
Abstract

Gas diffusion layer is one of the most important components of fuel cell, which supports the catalytic layer, collects the current and facilitates mass transfer. However, current carbon paper is mainly composed of long carbon fibers (CF), which brings drawbacks including rough surface, poor body homogeneity, excessive thickness, and preparation difficulty, etc. In this research, we invent a combination method to produce a highly flat, highly homogeneous, ultra-thin and high-performance carbon paper for proton exchange membrane fuel cell (PEMFC). The method combines the advantages of two materials, i.e. few-walled carbon nanotube (FWCNT) with high flatness and short CF with high porosity. And the combination method only contains three steps, material dispersion, carbon paper formation and heat treatment. The highest temperature for the heat treatment process is only 350 °C, which is much lower than the traditional 2000 °C. Due to the small size and fine distribution of FWCNT and CF, the new carbon paper exhibits highly flat (

Published
2022
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