Advanced Functional Materials
Advanced Functional Materials
5 years ago

Metal–Organic Framework Derived Co3O4/TiO2/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation

Metal–Organic Framework Derived Co3O4/TiO2/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation
Rui Tang, Shujie Zhou, Longwei Yin, Zhimin Yuan
A novel hierarchical structured photoanode based on metal–organic frameworks (MOFs)-derived porous Co3O4-modified TiO2 nanorod array grown on Si (MOFs-derived Co3O4/TiO2/Si) is developed as photoanode for efficiently photoelectrochemical (PEC) water oxidation. The ternary Co3O4/TiO2/Si heterojunction displays enhanced carrier separation performance and electron injection efficiency. In the ternary system, an abnormal type-II heterojunction between TiO2 and Si is introduced, because the conduction band and valence band position of Si are higher than those of TiO2, the photogenerated electrons from TiO2 will rapidly recombine with the photogenerated holes from Si, thus leading to an efficient separation of photogenerated electrons from Si/holes from TiO2 at the TiO2/Si interface, greatly improving the separation efficiency of photogenerated hole within TiO2 and enhances the photogenerated electron injection efficiency in Si. While the MOFs-derived Co3O4 obviously improves the optical-response performance and surface water oxidation kinetics due to the large specific surface area and porous channel structure. Compared with MOFs-derived Co3O4/TiO2/FTO photoanode, the synergistic function in the MOFs-derived Co3O4/TiO2/Si NR photoanode brings greatly enhanced photoconversion efficiency of 0.54% (1.04 V vs reversible hydrogen electrode) and photocurrent density of 2.71 mA cm−2 in alkaline electrolyte. This work provides promising methods for constructing high-performance PEC water splitting photoanode based on MOFs-derived materials. Metal–organic frameworks (MOF) derived Co3O4/TiO2/Si heterostructured nanorod (NR) array photoanodes for efficient photoelectrochemical water oxidation are developed. The abnormal type-II TiO2/Si heterojunction greatly improves the photogenerated hole separation and electron injection efficiencies. The synergistic function in Co3O4/TiO2/Si NR photoanode brings a greatly enhanced photoconversion efficiency of 0.54% and a photocurrent density of 2.71 mA cm−2 in an alkaline electrolyte.

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

DOI: 10.1002/adfm.201701102

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.