Highly flexible transparent substrate-free photoanodes using ZnO nanowires on nickel microfibers

Hong Seok Jo, Edmund Samuel, Hyuk Jin Kwon, Bhavana Joshi, Min Woo Kim, Tae Gun Kim, Mark T. Swihart, Suk Goo Yoon

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We demonstrate impressive performance of photoanodes comprising ZnO nanowires grown over nickel fibers for efficient water splitting. The photoanode is substrate-free and flexible, exhibiting excellent stability (∼98%) in photocurrent density even after 1000 bending cycles. The hierarchically structured ZnO nanowires on nickel microfibers synergistically provide many accessible electrochemical sites and enhance the photocurrent density to 1.14 mA/cm2 at a voltage of 0.4 V vs. Ag/AgCl. The one- and two-dimensional structures of the ZnO nanowires over nickel microfibers enable an efficient charge-transport mechanism that supports high light-harvesting efficiency. Scanning and transmission electron microscopy are used to study the morphologies of the samples in detail, while X-ray diffraction confirms the metallic state of Ni and the crystallinity of ZnO.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalChemical Engineering Journal
Volume363
DOIs
Publication statusPublished - 2019 May 1

Keywords

  • Flexible
  • Microfibers
  • Nanowires
  • Nickel
  • Photoanode
  • Substrate-free
  • Transparent
  • ZnO

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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