Decoupled electrolysis using a silicotungstic acid electron-coupled-proton buffer in a proton exchange membrane cell
Decoupled electrolysis using a silicotungstic acid electron-coupled-proton buffer in a proton exchange membrane cell
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DOI：
10.1016/j.electacta.2019.135255
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发表时间：
2020-01-20
影响因子：
6.6
通讯作者：
Symes, Mark D.
中科院分区：
文献类型：
--
作者：
Chisholm, Greig;Cronin, Leroy;Symes, Mark D.
通过电解水将可再生能源储存为氢气是可持续氢经济的基本基石。传统的电解槽通常需要稳定的功率输入才能有效和安全地运行，因此可能不适合利用通常是间歇和扩散的可再生能源。由电子耦合质子缓冲器介导的电解有可能克服使用低和/或零星功率输入(特别是与气体交叉有关的那些)的电解周围的一些挑战，因为电子耦合质子缓冲器的使用允许放氧和放氢反应彼此完全解耦。在这里，我们证明了硅钨酸可以作为质子交换膜电池中的电子耦合质子缓冲剂，在高达500 mA cm(-2)的稳态电流密度下解耦析氢和析氧反应。通过循环固定体积的电子耦合质子缓冲溶液，该系统可以连续生产O-2和H-2。即使在低至25毫安厘米(-2)的电流密度下，氧气中的氢水平也是
The storage of renewably-generated energy as hydrogen via the electrolysis of water is a fundamental cornerstone of a sustainable hydrogen economy. Conventional electrolysers usually require stable power inputs in order to operate effectively and safely and so may be unsuited to harnessing renewable power, which is often intermittent and diffuse. Electrolysis mediated by Electron-Coupled-Proton Buffers has the potential to overcome some of the challenges surrounding electrolysis using low and/or sporadic power inputs (especially those related to gas crossover) as the use of Electron-Coupled-Proton Buffers allows the oxygen and hydrogen evolution reactions to be completely decoupled from one another. Herein, we show that silicotungstic acid can be used as an Electron-Coupled-Proton Buffer in a proton exchange membrane cell, decoupling the hydrogen and oxygen evolution reactions at steady state current densities as high as 500 mA cm(-2). O-2 and H-2 can be produced continuously by this system by cycling a fixed volume of the Electron-Coupled-Proton Buffer solution. Even at current densities as low as 25 mA cm(-2), the level of hydrogen in the oxygen stream is