Nanoporous BiVO4 photoanodes with dual-layer oxygen evolution catalysts for solar water splitting
Bismuth vanadate (BiVO4) has a band structure that is well-suited for potential use as a photoanode in solar water splitting, but it suffers from poor electron-hole separation. Here, we demonstrate that a nanoporous morphology (specific surface area of 31.8 square meters per gram) effectively suppre...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2014-02, Vol.343 (6174), p.990-994 |
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| creator | Kim, Tae Woo Choi, Kyoung-Shin |
| description | Bismuth vanadate (BiVO4) has a band structure that is well-suited for potential use as a photoanode in solar water splitting, but it suffers from poor electron-hole separation. Here, we demonstrate that a nanoporous morphology (specific surface area of 31.8 square meters per gram) effectively suppresses bulk carrier recombination without additional doping, manifesting an electron-hole separation yield of 0.90 at 1.23 volts (V) versus the reversible hydrogen electrode (RHE). We enhanced the propensity for surface-reaching holes to instigate water-splitting chemistry by serially applying two different oxygen evolution catalyst (OEC) layers, FeOOH and NiOOH, which reduces interface recombination at the BiVO4/OEC junction while creating a more favorable Helmholtz layer potential drop at the OEC/electrolyte junction. The resulting BiVO4/FeOOH/NiOOH photoanode achieves a photocurrent density of 2.73 milliamps per square centimenter at a potential as low as 0.6 V versus RHE. |
| doi_str_mv | 10.1126/science.1246913 |
| format | Article |
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Here, we demonstrate that a nanoporous morphology (specific surface area of 31.8 square meters per gram) effectively suppresses bulk carrier recombination without additional doping, manifesting an electron-hole separation yield of 0.90 at 1.23 volts (V) versus the reversible hydrogen electrode (RHE). We enhanced the propensity for surface-reaching holes to instigate water-splitting chemistry by serially applying two different oxygen evolution catalyst (OEC) layers, FeOOH and NiOOH, which reduces interface recombination at the BiVO4/OEC junction while creating a more favorable Helmholtz layer potential drop at the OEC/electrolyte junction. The resulting BiVO4/FeOOH/NiOOH photoanode achieves a photocurrent density of 2.73 milliamps per square centimenter at a potential as low as 0.6 V versus RHE.</abstract><cop>United States</cop><pub>The American Association for the Advancement of Science</pub><pmid>24526312</pmid><doi>10.1126/science.1246913</doi><tpages>5</tpages></addata></record> |
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| source | Science Magazine; JSTOR |
| subjects | Catalysts Chemical compounds Chemical reactions Materials science Organic Chemistry Scientific Concepts Water |
| title | Nanoporous BiVO4 photoanodes with dual-layer oxygen evolution catalysts for solar water splitting |
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