High Performance Anion Exchange Membrane Electrolysis Using Plasma-Sprayed, Non-Precious-Metal Electrodes,ACS Applied Energy Materials

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High Performance Anion Exchange Membrane Electrolysis Using Plasma-Sprayed, Non-Precious-Metal Electrodes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-10-29 00:00:00 , DOI: 10.1021/acsaem.9b01392
Li Wang ₁ , Thomas Weissbach ₂ , Regine Reissner ₁ , Asif Ansar ₁ , Aldo S. Gago ₁ , Steven Holdcroft ₂ , K. Andreas Friedrich _{1,

3}

Affiliation

The production of green hydrogen by a cost-effective electrolysis technology is of paramount importance for future energy supply systems. In this regard, proton exchange membrane (PEM) electrolysis is the technology of choice due to its compactness and high efficiency; however, its dependence on the scarce iridium catalyst jeopardizes the deployment at large scale. Here, we present a low-cost electrolyzer consisting of an assembly of an anion exchange membrane (AEM) and plasma-sprayed electrodes without any precious metals. Several electrode materials are developed and tested in this configuration at 60 °C and feeding 1 M KOH electrolyte. The AEM electrolyzer with NiAlMo electrodes can achieve a potential of 2.086 V at a current density of 2 A cm^–2, which is comparable to the performances of industrial MW-size PEM electrolyzers. The cell potential with NiAl anode and NiAlMo cathode is 0.4 V higher at the same current density, but it keeps a stable operation for more than 150 h. Through different post-mortem analyses on the aged electrodes, the degradation mechanism of NiAlMo anode is elucidated. The efficiencies of the developed AEM electrolyzer concept reported herein are close to those of the commercial PEM systems, and thus a cost-effective alternative to this technology is provided based on our results.

中文翻译：

使用等离子喷涂非贵金属电极的高性能阴离子交换膜电解

通过具有成本效益的电解技术生产绿色氢气对于未来的能源供应系统至关重要。在这方面，质子交换膜（PEM）电解由于其紧凑和高效而成为首选技术。然而，其对稀缺铱催化剂的依赖危及了大规模的部署。在这里，我们介绍了一种低成本的电解槽，该电解槽由阴离子交换膜（AEM）和无任何贵金属的等离子喷涂电极组成。在此配置下，在60°C的条件下开发并测试了几种电极材料，并喂入了1 M KOH电解质。带有NiAlMo电极的AEM电解槽在2 A cm ^–2的电流密度下可以达到2.086 V的电势，可媲美工业级MW尺寸PEM电解槽的性能。在相同的电流密度下，带有NiAl阳极和NiAlMo阴极的电池电势高0.4 V，但在超过150 h的时间内仍能保持稳定的运行。通过对老化电极进行不同的验尸分析，阐明了NiAlMo阳极的降解机理。本文报道的开发的AEM电解器概念的效率与商用PEM系统的效率接近，因此根据我们的结果提供了该技术的经济高效的替代方案。

更新日期：2019-10-29

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