5 years ago

In Situ Structural Study of MnPi-Modified BiVO4 Photoanodes by Soft X-ray Absorption Spectroscopy

In Situ Structural Study of MnPi-Modified BiVO4 Photoanodes by Soft X-ray Absorption Spectroscopy
Kathrin M. Lange, Fatwa F. Abdi, Sebastian Fiechter, Fuxian Wang, Roel van de Krol, Klaus Ellmer, Christoph Schwanke, Lifei Xi, Ronny Golnak
In this study we demonstrate that the PEC performance of BiVO4 photoanodes can be improved by deposition of a MnPi catalyst layer. We investigated the electronic structure of the layer using in situ soft X-ray absorption spectroscopy (XAS) at the Mn L-edge upon varying the applied potentials and the illumination conditions. Using the linear combination method, information on different Mn species and Mn oxidation states was obtained. We found that the charge transfer at the MnPi/electrolyte interface is affected by band bending related to the applied and built-in potential. With increasing potential the electronic properties of the MnOx layer and its structure are changing, leading to a birnessite-type layer structure associated with an electron transfer from the MnPi film to the BiVO4 photoanode. The present work should benefit the potential applications of other oxygen evolution catalysts (OECs) on photoanodes.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06459

DOI: 10.1021/acs.jpcc.7b06459

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.