High Solar-to-Hydrogen Conversion Efficiency at pH 7 Based on a PV-EC Cell with an Oligomeric Molecular Anode

Yuanyuan Shi, Tsung Yu Hsieh, Md Asmaul Hoque, Werther Cambarau, Stéphanie Narbey, Carolina Gimbert-Surinãch*, Emilio Palomares, Mario Lanza, Antoni Llobet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In the urgent quest for green energy vectors, the generation of hydrogen by water splitting with sunlight occupies a preeminent standpoint. The highest solar-to-hydrogen (STH) efficiencies have been achieved with photovoltaic-electrochemical (PV-EC) systems. However, most PV-EC water-splitting devices are required to work at extreme conditions, such as in concentrated solutions of HClO4 or KOH or under highly concentrated solar illumination. In this work, a molecular catalyst-based anode is incorporated for the first time in a PV-EC configuration, achieving an impressive 21.2% STH efficiency at neutral pH. Moreover, as opposed to metal oxide-based anodes, the molecular catalyst-based anode allows us to work with extremely small catalyst loadings (<16 nmol/cm2) due to a well-defined metallic center, which is responsible for the fast catalysis of the reaction in the anodic compartment. This work paves the way for integrating molecular materials in efficient PV-EC water-splitting systems.

Original languageEnglish
Pages (from-to)55856-55864
Number of pages9
JournalACS applied materials & interfaces
Volume12
Issue number50
DOIs
StatePublished - 16 Dec 2020

Keywords

  • anode
  • molecular catalyst
  • neutral pH
  • photovoltaic-electrolysis (PV-EC)
  • solar-driven water splitting
  • solar-to-hydrogen efficiency

Fingerprint Dive into the research topics of 'High Solar-to-Hydrogen Conversion Efficiency at pH 7 Based on a PV-EC Cell with an Oligomeric Molecular Anode'. Together they form a unique fingerprint.

Cite this