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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication of NbN-Coated Porous Titanium Sheets for PEM Electrolyzers
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Fabrication of NbN-Coated Porous Titanium Sheets for PEM Electrolyzers

机译：用于PEM电解器的NBN涂层多孔钛板的制备

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摘要

Porous titanium sheets are attractive for application as the porous transport layer (PTL) for polymer electrolyte membrane (PEM) water electrolyzers. However, the titanium passivation increases its surface contact resistance, deteriorating the electrolyzer performance. A solution for long-term operation has been to coat titanium-based PTLs with platinum or gold, which considerably increases PEM electrolyzer costs. To overcome this limitation, a NbN coating is proposed as an alternative to decrease materials costs while avoiding titanium surface oxidation. Therefore, porous titanium sheets of ca. 250 mu m were powder metallurgically produced by tape casting and then sputter-coated with a NbN thin film. A systematic investigation of NbN film deposition on porous titanium sheets by reactive magnetron sputtering was undertaken. Coating microstructure and constitution were evaluated before and after electrochemical characterization. First electrochemical characterizations throughout cyclic voltammetry and potentiodynamic polarization curves demonstrate that the addition of NbN coatings decreases titanium surface oxidation and improves electrochemical performance of the porous titanium sheets. These results indicated that NbN-coated PTLs are promising candidates for PEM electrolyzer application.
机译：多孔钛板对于用于聚合物电解质膜（PEM）水电解器的多孔传输层（PTL）是有吸引力的。然而，钛钝化增加了其表面接触电阻，劣化电解槽性能。用于长期操作的解决方案已经用铂或金涂上基于钛的PTL，这显着增加了PEM电解槽成本。为了克服这种限制，提出了一种NbN涂层作为降低材料成本的替代方案，同时避免钛表面氧化。因此，多孔钛板材的CA。 250μm是通过胶带铸造冶金生产的粉末，然后用NbN薄膜溅射涂覆。通过反应磁控溅射进行多孔钛板对NBN膜沉积的系统研究。在电化学表征之前和之后评估涂层微观结构和构造。在循环伏安法和电位动力学曲线的第一电化学特征表明，NBN涂层的加入降低了钛表面氧化并提高了多孔钛板的电化学性能。这些结果表明，NBN涂层的PTL是PEM电解柜应用的承诺候选者。

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