5 years ago

Iron Oxide Photoelectrode with Multidimensional Architecture for Highly Efficient Photoelectrochemical Water Splitting

Iron Oxide Photoelectrode with Multidimensional Architecture for Highly Efficient Photoelectrochemical Water Splitting
Jae-Yup Kim, Yung-Eun Sung, Jin Kim, Tae Hwa Jeon, Seung-Ho Yu, Hyeji Park, Heeman Choe, Wonyong Choi, Jin Soo Kang, Docheon Ahn, Yoonsook Noh, Hyelim Choi, David C. Dunand, Jun-Ho Yum
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 photoelectrode 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. An anodized iron foam photoelectrode with multidimensional nano/micro-architecture leads to extremely large photocurrent generation and high Faradaic efficiency in photoelectrochemical water splitting. Morphologies of anodic iron oxides and activation of photoelectrode by phase transition phenomena were also investigated.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201703326

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