Journal
SCIENCE
Volume 345, Issue 6202, Pages 1326-1330Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1257443
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Funding
- Engineeering and Physical Sciences Research Council (UK)
- Royal Society/Wolfson Foundation
- University of Glasgow
- EPSRC [EP/J015156/1, EP/J00135X/1, EP/K023004/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K023004/1, EP/J00135X/1, EP/J015156/1] Funding Source: researchfish
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The electrolysis of water using renewable energy inputs is being actively pursued as a route to sustainable hydrogen production. Here we introduce a recyclable redox mediator (silicotungstic acid) that enables the coupling of low-pressure production of oxygen via water oxidation to a separate, catalytic hydrogen production step outside the electrolyzer that requires no post-electrolysis energy input. This approach sidesteps the production of high-pressure gases inside the electrolytic cell (a major cause of membrane degradation) and essentially eliminates the hazardous issue of product gas crossover at the low current densities that characterize renewables-driven water-splitting devices. We demonstrated that a platinum-catalyzed system can produce pure hydrogen over 30 times faster than state-of-the-art proton exchange membrane electrolyzers at equivalent platinum loading.
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