Scalable hydrogen production from a mono-circular filter press Divergent Electrode-Flow-Through alkaline electrolysis stack
Scalable hydrogen production from a mono-circular filter press Divergent Electrode-Flow-Through alkaline electrolysis stack
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DOI：
10.1016/j.jpowsour.2018.07.026
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发表时间：
2018-09-01
影响因子：
9.2
通讯作者：
Kriek, R. J.
中科院分区：
文献类型：
--
作者：
Gillespie, M. I.;Kriek, R. J.
为了提高性能和气体纯度，采用了迄今为止开发的所有积极设计标准，针对分流电极流过(DEFT(TM))无膜碱性电解技术，开发了一种可扩展且简单的单循环压滤机(MCFP)反应器并进行了测试。采用了一种改进的气液分离方法，在最佳流速为0.075 m S(-1)、电极间距为2.5 mm时，氢气和氧气的纯度分别为99.81%和99.50%。使用圆形30 mm网状电极，每个电极对都有自己的独立加压室，具有独特的电解液间接注入机制。通过结合气体吹扫，确保气体纯度在长时间运行中保持不变。采用镍/镍催化剂组合，在流速0.075 m S(-1)，温度60℃，电极间距2.5 mm的条件下，在2.5VDC下获得了1.14A cm(-2)的电流密度。在使用相同规格和实验条件的双层网状电极时，在2.5VDC下实现了1.91A cm(-2)的电流密度，为多层多孔电极对DIFT(TM)原理的有效性提供了证据。未来的改进将专注于减少该技术的占地面积和电解液流速。
By incorporating all positive design criteria developed to date, to improve on performance and gas purities, a scalable and simplistic Mono-Circular Filter Press (MCFP) reactor has been developed and tested for the Divergent Electrode-Flow-Through (DEFT (TM)) membraneless alkaline electrolysis technology. An improved gas/liquid separation methodology was utilised, which allows for hydrogen and oxygen gas purities of 99.81 and 99.50 vol% respectively, at the optimal flow velocity of 0.075 m s(-1) and an electrode gap of 2.5 mm. Circular 30 mm mesh electrodes were utilised, with each electrode pair having its own independent pressurised chamber, with a unique indirect injection mechanism for the electrolyte. By incorporating a gas purge ensures that gas purity is maintained for long operational periods. By utilising a Ni/Ni catalyst combination, a current density of 1.14 A cm(-2) at 2.5 VDC was obtained at a flow velocity of 0.075 m s(-1), 60 degrees C, and an electrode gap of 2.5 mm. In utilising a double layer of mesh, with the same specification, and experimental conditions, a current density of 1.91 A cm(-2) at 2.5 VDC was realised, providing evidence for the effectiveness of multi-layered porous electrodes for the DEFT (TM) principle. Future improvements will focus on reducing the footprint and electrolytic flow velocity for the technology.