Cathode starvation as an accelerated conditioning procedure for perfluorosulfonic acid ionomer fuel cells

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2020-06-01 DOI:10.1016/j.powera.2020.100012
Emmanuel Balogun , Alejandro Oyarce Barnett , Steven Holdcroft
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引用次数: 20

Abstract

Freshly assembled proton exchange fuel cells (PEMFC) require conditioning to reach maximum power density. This process may last up to tens of hours and adds to the cost of commercial fuel cell technology. We present an accelerated conditioning procedure involving starving the cathode of oxidant. In single cells, this procedure conditions a membrane electrode assembly (MEA) within 40 min, without compromising durability. The performance and durability of MEAs conditioned using this technique are compared with US Department of Energy (DOE) and European Union (EU) harmonized protocols, and to an amperometric conditioning protocol. The time to reach peak power density using cathode starvation conditioning is <10% of the time required for DOE, EU, and amperometric protocols. Conditioned MEAs were subjected to accelerated degradation by cycling the cell voltage between 0.6 V and open-circuit voltage under low relative humidity. Degradation was found to be caused by loss of electrochemical surface area of the cathode, which in turn increases the charge transfer resistance of the MEA. MEAs conditioned using cathode starvation experienced only a 15% loss in performance; in contrast to 19, 17 and 17% losses in performance caused by the DOE, EU, and amperometric protocols, respectively.

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阴极饥饿作为全氟磺酸离聚体燃料电池的加速调理程序
新组装的质子交换燃料电池(PEMFC)需要调节以达到最大功率密度。这一过程可能持续长达数十小时,并增加了商业燃料电池技术的成本。我们提出了一种加速调节程序,包括饿死阴极的氧化剂。在单细胞中,该程序在40 min内调节膜电极组装(MEA),而不影响耐久性。使用该技术调节的mea的性能和耐久性与美国能源部(DOE)和欧盟(EU)协调协议以及安培调节协议进行了比较。使用阴极饥饿调节达到峰值功率密度的时间是DOE, EU和安培协议所需时间的10%。在低相对湿度条件下,通过将电池电压在0.6 V和开路电压之间循环,使条件化mea加速降解。降解是由阴极电化学表面积的损失引起的,这反过来又增加了MEA的电荷转移电阻。使用阴极饥饿条件的mea性能仅下降15%;相比之下,DOE、EU和安培方案分别造成了19%、17%和17%的性能损失。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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