title: Growth and Photoelectrochemical Energy Conversion of Wurtzite Indium Phosphide Nanowire Arrays.
abstract: Photoelectrochemical (PEC) water splitting into hydrogen and oxygen is a promising strategy to absorb solar energy and directly convert it into a dense storage medium in the form of chemical bonds. The continual development and improvement of individual components of PEC systems is critical toward increasing the solar to fuel efficiency of prototype devices. Within this context, we describe a study on the growth of wurtzite indium phosphide (InP) nanowire (NW) arrays on silicon substrates and their subsequent implementation as light-absorbing photocathodes in PEC cells. The high onset potential (0.6 V vs the reversible hydrogen electrode) and photocurrent (18 mA/cm(2)) of the InP photocathodes render them as promising building blocks for high performance PEC cells. As a proof of concept for overall system integration, InP photocathodes were combined with a nanoporous bismuth vanadate (BiVO4) photoanode to generate an unassisted solar water splitting efficiency of 0.5%.
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Nikolay
authors.initials: N
authors.lastname: Kornienko
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.|Chemical Sciences Division, Lawrence Berkeley National Lab , Berkeley, California 94720, United States.
authors.forename: Natalie A
authors.initials: NA
authors.lastname: Gibson
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Samuel W
authors.initials: SW
authors.lastname: Eaton
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Lab , Berkeley, California 94720, United States.
authors.forename: Shaul
authors.initials: S
authors.lastname: Aloni
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.|Department of Physics, University of California , Berkeley, California 94720, United States.|Chemical Sciences Division, Lawrence Berkeley National Lab , Berkeley, California 94720, United States.
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Leone
authors.affiliation: Department of Chemistry, University of California , Berkeley, California 94720, United States.|Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Lab , Berkeley, California 94720, United States.|Kavli Nanoscience Institute , Berkeley, California 94720, United States.
authors.forename: Peidong
authors.initials: P
authors.lastname: Yang
keywords: catalysis; chemical vapor deposition; energy conversion; nanowire synthesis; photoelectrochemistry