Insights into Oxygen Mass Transport Mechanisms in High-Temperature Proton Exchange Membrane Fuel Cells with Microelectrode
Insights into Oxygen Mass Transport Mechanisms in High-Temperature Proton Exchange Membrane Fuel Cells with Microelectrode
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DOI：
10.1149/1945-7111/acfc6a
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Qinggang He
中科院分区：
文献类型：
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作者：
Sifan Chen;Jianchun Niu;Shuomeng Zhang;Zhuang Ma;Qinghua Zhang;Shiyuan Chen;Liang Wu;Jialin Zhang;Miao Wang;Shanfu Lu;Qinggang He
Abstract. The mass transport of oxygen in the cathode catalyst layer of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) has a great impact on cell performance. However, some bulk average methods are unable to study the permeation properties of oxygen near the triple phase boundary of HT-PEMFCs due to the size mismatch. Here, we develop a microelectrode integrated system to quantitatively study the O2 mass transport behavior at the Pt/ binder interface under actual operating temperatures (100-180°C). The oxygen diffusion coefficients and solubility obtained from potential-step chronoamperometry and a modified Cottrell equation follow the diffusion "ball-cage" model and the dual-mode solubility model. Subsequently, molecular dynamics simulations are used to describe the key structural elements and diffusion behavior of oxygen molecules from the microscopic perspective. These results provide a scientific approach to study the mass transfer process of oxygen at the local environment, endowing with insightful strategies for future improvement and applications of HT-PEMFCs.
