Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Renewable hydrogen generation from a dual-circuit redox flow battery
AU - Amstutz, Veronique
AU - Toghill, Kathryn E.
AU - Powlesland, Francis
AU - Vrubel, Heron
AU - Comninellis, Christos
AU - Hu, Xile
AU - Girault, Hubert H.
PY - 2014/7
Y1 - 2014/7
N2 - Redox flow batteries (RFBs) are particularly well suited for storing the intermittent excess supply of renewable electricity, so-called "junk" electricity. Conventional RFBs are charged and discharged electrochemically, with electricity stored as chemical energy in the electrolytes. In the RFB system reported here, the electrolytes are conventionally charged but are then chemically discharged over catalytic beds in separate external circuits. The catalytic reaction of particular interest generates hydrogen gas as secondary energy storage. For demonstration, indirect water electrolysis was performed generating hydrogen and oxygen in separate catalytic reactions. The electrolyte containing V(II) was chemically discharged through proton reduction to hydrogen on a molybdenum carbide catalyst, whereas the electrolyte comprising Ce(IV) was similarly discharged in the oxidation of water to oxygen on a ruthenium dioxide catalyst. This approach is designed to complement electrochemical energy storage and may circumvent the low energy density of RFBs especially as hydrogen can be produced continuously whilst the RFB is charging.
AB - Redox flow batteries (RFBs) are particularly well suited for storing the intermittent excess supply of renewable electricity, so-called "junk" electricity. Conventional RFBs are charged and discharged electrochemically, with electricity stored as chemical energy in the electrolytes. In the RFB system reported here, the electrolytes are conventionally charged but are then chemically discharged over catalytic beds in separate external circuits. The catalytic reaction of particular interest generates hydrogen gas as secondary energy storage. For demonstration, indirect water electrolysis was performed generating hydrogen and oxygen in separate catalytic reactions. The electrolyte containing V(II) was chemically discharged through proton reduction to hydrogen on a molybdenum carbide catalyst, whereas the electrolyte comprising Ce(IV) was similarly discharged in the oxidation of water to oxygen on a ruthenium dioxide catalyst. This approach is designed to complement electrochemical energy storage and may circumvent the low energy density of RFBs especially as hydrogen can be produced continuously whilst the RFB is charging.
KW - REDOX FLOW BATTERY
KW - WATER OXIDATION
KW - HYDROGEN
KW - ENERGY STORAGE
KW - VANADIUM
KW - ELECTROCATALYSTS
KW - KINETICS
KW - CERIUM
KW - OXYGEN
KW - MOS2
U2 - 10.1039/c4ee00098f
DO - 10.1039/c4ee00098f
M3 - Journal article
VL - 7
SP - 2350
EP - 2358
JO - Energy and Environmental Science
JF - Energy and Environmental Science
SN - 1754-5692
IS - 7
ER -