Molecular Chemistry-Controlled Hybrid Ink-Derived Efficient Cu2ZnSnS4 Photocathodes for Photoelectrochemical Water Splitting

Wooseok Yang, Yunjung Oh, Jimin Kim, Myung Jin Jeong, Jong Hyeok Park, Joo Ho Moon

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

To realize economically competitive hydrogen production through photoelectrochemical (PEC) water splitting, it is essential to develop an efficient photoelectrode consisting of earth-abundant constituents in conjunction with low-cost solution processing. Cu2ZnSnS4 (CZTS) has received significant attention as a promising photocathode owing to its abundance and good absorption properties. However, the efficiency of the solution-processed CZTS photocathode is not yet comparable to its counterparts. Here, a hybrid ink, obtained by careful control of precursor mixing order, was used to produce a highly efficient CZTS photocathode. The molecular chemistry-controlled hybrid ink formulation, particularly the roles of thiourea-Sn2+ complexation, was elucidated by liquid Raman spectroscopy. The hybrid ink-derived CZTS thin films modified with conformal coating of an n-type TiO2/CdS double layer and a Pt electrocatalyst achieved an exceptionally high photocurrent of 13 mA cm-2 at -0.2 V versus a reversible hydrogen electrode under 1 sun illumination. The modified photocathodes showed relatively stable H2 production with faradaic efficiency close to unity.

Original languageEnglish
Pages (from-to)1127-1136
Number of pages10
JournalACS Energy Letters
Volume1
Issue number6
DOIs
Publication statusPublished - 2016 Dec 9

Fingerprint

Photocathodes
Ink
Water
Thiourea
Thioureas
Electrocatalysts
Hydrogen production
Complexation
Photocurrents
Sun
Raman spectroscopy
Hydrogen
Lighting
Earth (planet)
Thin films
Coatings
Electrodes
Cu2ZnSnS4
Liquids
Processing

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this

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title = "Molecular Chemistry-Controlled Hybrid Ink-Derived Efficient Cu2ZnSnS4 Photocathodes for Photoelectrochemical Water Splitting",
abstract = "To realize economically competitive hydrogen production through photoelectrochemical (PEC) water splitting, it is essential to develop an efficient photoelectrode consisting of earth-abundant constituents in conjunction with low-cost solution processing. Cu2ZnSnS4 (CZTS) has received significant attention as a promising photocathode owing to its abundance and good absorption properties. However, the efficiency of the solution-processed CZTS photocathode is not yet comparable to its counterparts. Here, a hybrid ink, obtained by careful control of precursor mixing order, was used to produce a highly efficient CZTS photocathode. The molecular chemistry-controlled hybrid ink formulation, particularly the roles of thiourea-Sn2+ complexation, was elucidated by liquid Raman spectroscopy. The hybrid ink-derived CZTS thin films modified with conformal coating of an n-type TiO2/CdS double layer and a Pt electrocatalyst achieved an exceptionally high photocurrent of 13 mA cm-2 at -0.2 V versus a reversible hydrogen electrode under 1 sun illumination. The modified photocathodes showed relatively stable H2 production with faradaic efficiency close to unity.",
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Molecular Chemistry-Controlled Hybrid Ink-Derived Efficient Cu2ZnSnS4 Photocathodes for Photoelectrochemical Water Splitting. / Yang, Wooseok; Oh, Yunjung; Kim, Jimin; Jeong, Myung Jin; Park, Jong Hyeok; Moon, Joo Ho.

In: ACS Energy Letters, Vol. 1, No. 6, 09.12.2016, p. 1127-1136.

Research output: Contribution to journalArticle

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