Optimizing "artificial leaf photoanode-photocathode-catalyst interface systems for solar water splitting

S. H. Porter, S. Hwang, V. Amarasinghe, E. Taghaddos, V. Manichev, M. Li, G. Gardner, A. Safari, Eric Garfunkel, M. Greenblatt, G Charles Dismukes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

A novel dual photoabsorber interface: perovskite oxynitride (SrNb02N) deposited on silicon (100), and a H2ER catalyst photoabsorber interface: (Ni5P4 or Ni2P)-silicon, are fabricated. Titanium nitride (TiN) is introduced as a blocking layer between Sr2Nb:07 and Si (100), which produces clean interfaces. During the high temperature ammonolysis step needed to convert Sr2Nb207 to SrNb02N, it is effective at blocking Nb and Si (but not Sr) migration. A half-cell cathode with the H2ER catalyst (Ni5P4 or Ni2P)-photoabsorber interface produces H2 approaching best-in-class overpotentials for films (N15P4: 211mV vs RHE at 10mV/cm2) with a 50mV/decade Tafel slope. Films are atomically smooth, except for surface phosphate that is removed during electrolysis.

Original languageEnglish
Title of host publicationRenewable Fuels via Artificial Photosynthesis or Electrolysis
PublisherElectrochemical Society Inc.
Pages1-19
Number of pages19
Volume72
Edition37
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Renewable Fuels via Artificial Photosynthesis or Electrolysis - 229th ECS Meeting - San Diego, United States
Duration: May 29 2016Jun 2 2016

Other

OtherSymposium on Renewable Fuels via Artificial Photosynthesis or Electrolysis - 229th ECS Meeting
CountryUnited States
CitySan Diego
Period5/29/166/2/16

ASJC Scopus subject areas

  • Engineering(all)

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