Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 14, Issue 2, Pages 883-889Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee03639k
Keywords
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Funding
- National Natural Science Foundation of China [21975052, 21935003, 21805126]
- State Key Basic Research Program of China [2016YFA0203302, 2018YFE0201702]
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The decoupled amphoteric water electrolysis system, assisted with MnO2/Mn2+ redox mediator, separates the tightly coupled hydrogen and oxygen production processes into two independent processes, allowing high-efficiency hydrogen production under high power input. This system can be integrated with an Mn-Zn battery to achieve flexible conversion from renewables to hydrogen and electric energy, making full use of renewable resources.
Amphoteric water electrolysis with a bipolar membrane can accommodate optimal pH conditions simultaneously for both cathode and anode under steady-state operation without changing the overall thermodynamics of water splitting. However, the high voltage loss of bipolar membrane imposes significant constraints on operating current density, leading to low current density (<50 mA cm(-2)) for hydrogen production. In this work, decoupled amphoteric water electrolysis assisted with MnO2/Mn2+ redox mediator demonstrated to separate the stiff couple between hydrogen and oxygen production into two independent processes, which enables hydrogen production to run under high power input (up to 1 A cm(-2)) with oxygen production under low power input. Furthermore, such an amphoteric decoupled water electrolysis system can be integrated with an Mn-Zn battery, which is able to realize flexible conversion from renewables to hydrogen and electric energy, thus making full use of renewables.
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