Production of the Porous Transport Layer Based on Stainless Steel Felt for Anion Exchange Membrane Water Electrolysis

IF 5.5 3区 材料科学 Q1 ELECTROCHEMISTRY
Longxu Li, Wenxing Jiang, Qiqi Wan, Endao Zhang, Bang Li, Lei Yuan, Guangfu Li, Junbo Hou, Xiaodong Zhuang, Junliang Zhang, Changchun Ke
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Abstract

Anion Exchange Membrane Water Electrolysis (AEMWE), is considered as one of the most promising available green production technologies, due to its overall low cost and high performance. Porous transport layers (PTLs), are much important for the performance of AEMWE, providing effective electron transport channels and efficient removal of gas products. Stainless steel-based PTLs have been demonstrated to achieve better performance at a reduced cost compared to routine nickel-base PTLs. Herein, PTLs based on 316L stainless-steel with varying parameters (fiber diameter, thickness and porosity) are investigated from a production perspective to identify the optimal design. How these parameters impact the performance of water electrolysis is further analyzed by separating the ohmic, activation and mass transfer overpotentials. The results indicate that the fiber diameter and porosity are of greater significance than the thickness. The fiber diameter exerts the most substantial effect on the performance and polarization distribution for AEMWE. The PTL with a fiber diameter of 12 μm performs best, representing a compromise among electrochemical reaction, electrical conductivity and mass transfer. Furthermore, the ohmic resistance and mass transfer process are the main factors influencing the observed differences in performance with varying thicknesses and porosities. The optimum thickness and porosity are subsequently identified as 0.3 mm and 72%, respectively. In conclusion, this study presents an optimal structure for the anode PTL based on 316L stainless-steel felts in AEMWE, achieving the current density of 2.760 A/cm2 at 2.0 V.
阴离子交换膜电解用不锈钢毡多孔传输层的制备
阴离子交换膜电解(AEMWE)因其整体成本低、性能好而被认为是最有前途的绿色生产技术之一。多孔输运层(PTLs)提供了有效的电子输运通道和高效的气体产物去除,对AEMWE的性能至关重要。与常规的镍基物理带库相比,不锈钢基物理带库已被证明以更低的成本获得更好的性能。本文以316L不锈钢为原料,从生产角度研究了不同参数(纤维直径、厚度和孔隙率)下ptl的优化设计。通过分离欧姆过电位、活化过电位和传质过电位,进一步分析了这些参数对水电解性能的影响。结果表明,纤维直径和孔隙率的影响大于纤维厚度。光纤直径对AEMWE的性能和偏振分布影响最大。光纤直径为12 μm的PTL性能最好,体现了电化学反应、电导率和传质之间的折衷。此外,欧姆电阻和传质过程是影响不同厚度和孔隙率下观察到的性能差异的主要因素。最终确定最佳厚度为0.3 mm,孔隙率为72%。综上所述,本研究提出了一种基于316L不锈钢毡的AEMWE阳极PTL的最佳结构,在2.0 V下电流密度达到2.760 A/cm2。
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来源期刊
Electrochimica Acta
Electrochimica Acta 工程技术-电化学
CiteScore
11.30
自引率
6.10%
发文量
1634
审稿时长
41 days
期刊介绍: Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.
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