Porous PVA skin-covered thin Zirfon-type separator as a new approach boosting high-rate alkaline water electrolysis beyond 1000 hours’lifespan  

作　　者：Xi Luo Nengneng Xu Yongnan Zhou Xiaohui Yang Woochul Yang Guicheng Liu Joong Kee Lee Jinli Qiao 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China [3]Department of Physics,Dongguk University,Seoul 04620,Republic of Korea [4]School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 100096,China [5]Dept.of Chemical&Biochemical Eng,Gachon University,1342 Seongnam-daero,Seongnam-si 13120,Republic of Korea

出　　处：《eScience》2024年第6期127-137,共11页电化学与能源科学(英文)

基　　金：supported by the National Key Research and Development Program of China(2022YFE0138900);the National Natural Science Foundation of China(21972017);the“Scientific and Technical Innovation Action Plan”Basic Research Field of Shanghai Science and Technology Committee(19JC1410500).

摘　　要：Regulating the pore structure of a zirfon-based diaphragm is critical to promoting a high-rate alkaline electrolyzer,but it is still a big challenge to respond“trade-off”between the thickness of the diaphragm and the current density/gas barrier behavior.In this work,a porous hydrophilic skin layer with~μm thick of polyvinyl alcohol(PVA)has been successfully constructed and casted onto the thin zirfon-type separator composite(V-Zirfon-350μm).The V-Zirfon-350μm separator generates a high KOH uptake(>90%),low area resistance(0.2026Ωcm^(2))but a low electrolyte permeation flux density(5.2×10^(-4) mL cm^(-2) s^(-1) at 0.5 bar),which largely surpasses the state-of-the-art commercial Zirfon UTP-500μm diaphragm.When coupled with Raney Ni cathode and NiCoMo-LDH anode catalysts,the V-Zirfon-350μm separator offers a high current density over 1300 mA cm^(-2)@2.0 V(80℃ in 30%KOH)and a superior stability of 300 h under 800 mA cm^(-2) for alkaline water electrolysis(AWE).Specifically,the voltage is merely~3.5 V for two electrolytic cells connected in series,which can be even conducted for more than 1300 h at different operational conditions.This work provides a novel methodology for the practical application of a thin Zirfon-based diaphragm.

关 键 词：Alkaline water electrolysis Porous separator Zirfon type Polyvinyl alcohol Skin layer 

分 类 号：O64[理学—物理化学]