Performance enhancement of PEM electrolyzers through iridium-coated titanium porous transport layers
Performance enhancement of PEM electrolyzers through iridium-coated titanium porous transport layers
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DOI：
10.1016/j.elecom.2018.10.021
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发表时间：
2018-12-01
影响因子：
5.4
通讯作者：
Lehnert, Werner
中科院分区：
文献类型：
--
作者：
Liu, Chang;Carmo, Marcelo;Lehnert, Werner
用于聚合物电解质膜（PEM）水电解槽的钛基多孔传输层（PTL）受到表面钝化（钛氧化）的影响，从而增加了PTL与电极之间的界面电阻。对于长期运行，物理带库通常涂有相当数量的铂或金，以确保随着时间的推移合理的性能概况。此外，众所周知，铂和金的氧化物在电解条件下是不稳定的。在这项研究中，介绍了一种简单且可扩展的方法，通过将非常薄的铱层溅射到商用钛PTL上来保护钛PTL免受钝化。铱层降低了PTL/催化剂层界面的整体欧姆电阻，提高了电池的性能，达到了碳基PTL的水平。涂层过程中，铱均匀地沉积在PTL的内部结构中。这项研究的发现可能会导致使用铱作为钛ptl的保护层，有可能在更高的电池电压下运行，并导致电解槽的耐用性增加。
Titanium-based porous transport layers (PTL) used in polymer electrolyte membrane (PEM) water electrolyzers suffer from surface passivation (titanium oxidation), which increases the interface resistance between the PTL and electrode. For long-term operation, PTLs are typically coated with considerable amounts of platinum or gold to ensure reasonable performance profiles over time. Moreover, it is well known that the oxide forms of platinum and gold are not stable under electrolysis conditions. In this study, an easy and scalable method is introduced to protect the titanium PTL from passivation by sputtering very thin layers of iridium onto commercially-available titanium PTLs. The iridium layer reduces the overall ohmic resistance of the PTL/catalyst layer interface and improves the cell's performance to that achieved with carbon-based PTLs. The coating process homogeneously deposited iridium throughout the inner structure of the PTL. The findings of this study may lead to the use of iridium as a protective layer for titanium PTLs, potentially enable operation at increased cell voltages and lead to increased electrolyzer durability.