This study investigates the activity and stability of a Prussian blue analogue (PBA) as an inexpensive anode catalyst for Polymer Electrolyte Membrane Water Electrolysis (PEMWE). While some PBAs have recently been reported to catalyze the oxygen evolution reaction (OER) in acidic electrolytes, the present study focuses on their integration in a PEMWE device. Cobalt hexacyanoferrate nanoparticles were interfaced with an electrically conductive support that withstands the PEMWE anodic conditions, namely Sb-doped SnO₂. The OER activity of the composite materials was first verified in liquid electrolytes and then in PEMWE. A promising current density of 50–100 mA cm⁻² was reached at 2 V cell voltage. The PBA/Sb–SnO₂ anode was stable up to 1.9 V, but showed more and more instability at higher potentials. Increasing leaching rates of Sn and Sb observed above 1.9 V suggest that the material instability above 1.9 V can mainly be assigned to Sb-doped SnO₂ conductive support. These results are overall promising for the use of PBAs as catalytic sites at the anode of PEMWE. The study also identifies the need for more active PBAs in order to reach a higher current density at a cell voltage of 1.6–1.9 V, a potential range necessary for an acceptable energy efficiency of the PEMWE.

中文翻译：

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负载Sb的SnO ₂上负载的六氰合铁酸钴作为在酸性介质中析出氧的非贵金属催化剂†

这项研究调查了普鲁士蓝类似物（PBA）作为聚合物电解质膜水电解（PEMWE）的廉价阳极催化剂的活性和稳定性。虽然最近有报道称某些PBA可以催化酸性电解质中的氧释放反应（OER），但本研究的重点是将其集成到PEMWE设备中。六氰合铁酸钴纳米颗粒与可承受PEMWE阳极条件的导电载体（即掺Sb的SnO _2）接触。首先在液体电解质中然后在PEMWE中验证了复合材料的OER活性。在2 V电池电压下达到了有希望的50–100 mA cm ^-2的电流密度。PBA / Sb–SnO ₂阳极在高达1.9 V的电压下稳定，但在较高电势下显示出越来越多的不稳定性。在1.9 V以上观察到的Sn和Sb浸出率的增加表明，在1.9 V以上的材料不稳定性可以主要归因于掺Sb的SnO ₂导电载体。这些结果对于将PBA用作PEMWE阳极处的催化位点总体上是有希望的。该研究还确定了需要更多有源PBA以便在1.6–1.9 V的电池电压下达到更高的电流密度的要求，这是PEMWE可接受的能源效率所必需的电势范围。