Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 23, Pages 6583-6588Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201703326
Keywords
anodization; iron oxide; metal foam; photoelectrochemistry; water splitting
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Funding
- Institute for Basic Science (IBS) in the Republic of Korea [IBS-R006-G1]
- National Research Foundation (NRF) of the Republic of Korea [2014R1A2A1A11052513, 2012-0006680]
- National Research Foundation of Korea [2014R1A2A1A11052513, 2009-0093814, 22A20130012323] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nanostructured metal oxide semiconductors have shown outstanding performances in photoelectrochemical (PEC) water splitting, but limitations in light harvesting and charge collection have necessitated further advances in photo-electrode design. Herein, we propose anodized Fe foams (AFFs) with multidimensional nano/micro-architectures as a highly efficient photoelectrode for PEC water splitting. Fe foams fabricated by freeze-casting and sintering were electrochemically anodized and directly used as photoanodes. We verified the superiority of our design concept by achieving an unprecedented photocurrent density in PEC water splitting over 5 mA cm(-2) before the dark current onset, which originated from the large surface area and low electrical resistance of the AFFs. A photocurrent of over 6.8 mA cm(-2) and an accordingly high incident photon-to-current efficiency of over 50% at 400 nm were achieved with incorporation of Co oxygen evolution catalysts. In addition, research opportunities for further advances by structual and compositional modifications are discussed, which can resolve the low fill factoring behavior and improve the overall performance.
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