Water splitting by electrolysis at high current densities under 1.6 volts
Journal Article
·
· Energy & Environmental Science
- Univ. of Houston, TX (United States); Hunan Normal University (China); DOE/OSTI
- Univ. of Houston, TX (United States); Hunan Normal University (China)
- Univ. of Houston, TX (United States)
- Central China Normal University, Wuhan (China)
Splitting water into hydrogen and oxygen by electrolysis using electricity from intermittent waste heat, wind, or solar energies is one of the easiest and cleanest methods for high-purity hydrogen production and an effective way to store the excess electrical power. The key dilemma for efficient large-scale production of hydrogen by splitting of water via the hydrogen and oxygen evolution reactions (HER and OER, respectively) is the high overpotential required, especially for the OER. We report an exceptionally active and durable OER catalyst yielding current densities of 500 and 1000 mA cm-2 at overpotentials of only 259 mV and 289 mV in alkaline electrolyte, respectively, fulfilling the commercial criteria of the OER process. Together with a good HER catalyst, we have achieved the commercially required current densities of 500 and 1000 mA cm-2 at 1.586 and 1.657 V, respectively, with very good stability, dramatically lower than any previously reported voltage. This research sets the stage for large-scale hydrogen production by water splitting using excess electrical power whenever and wherever available.
- Research Organization:
- University of Houston, TX (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0010831
- OSTI ID:
- 1611555
- Alternate ID(s):
- OSTI ID: 1454364
- Journal Information:
- Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 10 Vol. 11; ISSN 1754-5692
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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