3.17% efficient Cu2ZnSnS4–BiVO4 integrated tandem cell for standalone overall solar water splitting
- 30 January 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 14 (3), 1480-1489
- https://doi.org/10.1039/d0ee03892j
Abstract
A 7.27% efficient Cu2ZnSnS4-based solar water splitting photocathode with long term stability of 24 hours was first reported by modification of a HfO2/CdS/HfO2 sandwich buffer layer. The effect of the deposited HfO2 atomic layer film at the two interfaces of CdS/CZTS and Pt/CdS or the electrolyte on the photoelectrochemical photocurrent, photovoltage and stability of the CZTS-based photocathode was systemically investigated with the following methods: time course observation of micromorphology transformation trends, light intensity-dependent Voc values (to reflect the variation in interfacial carrier recombination) and EIS spectra (for determining the changes in resistance that influence the charge transfer and trapping inside of the bulk semiconductors or surface/interfaces of the photocathode). The HfO2 layer between the CZTS and CdS interfaces significantly decreased the carrier recombination ratio inside the photocathode, and the HfO2 layer between the CdS and Pt or the electrolyte efficiently optimized the electrode/electrolyte interface that facilitates the charge transfer without being trapped. Furthermore, the CZTS–BiVO4 photocathode with a photoanode tandem cell was fabricated, and its unbiased solar to hydrogen conversion efficiency was achieved 3.17%, while a large 5 × 5 cm integrated CZTS photocathode in tandem with the BiVO4 photoanode with superior long term stability over 60 hours was assembled for the first time.Keywords
Funding Information
- National Natural Science Foundation of China (61704060)
- Science and Technology Planning Project of Guangdong Province (2019B090905005, 2020A1414010058)
- South China Normal University (2020XCC07)
This publication has 36 references indexed in Scilit:
- Cu(In,Ga)(S,Se)2 Photocathodes with a Grown-In CuxS Catalyst for Solar Water SplittingACS Energy Letters, 2019
- Development of highly efficient CuIn0.5Ga0.5Se2-based photocathode and application to overall solar driven water splittingEnergy & Environmental Science, 2018
- Wide Band Gap CuGa(S,Se)2 Thin Films on Transparent Conductive Fluorinated Tin Oxide Substrates as Photocathode Candidates for Tandem Water Splitting DevicesThe Journal of Physical Chemistry C, 2018
- Spatial control of cocatalysts and elimination of interfacial defects towards efficient and robust CIGS photocathodes for solar water splittingEnergy & Environmental Science, 2018
- Synthesis of CuInS2 nanowire arrays via solution transformation of Cu2S self-template for enhanced photoelectrochemical performanceApplied Catalysis B: Environmental, 2016
- A Bottom‐Up Approach toward All‐Solution‐Processed High‐Efficiency Cu(In,Ga)S2 Photocathodes for Solar Water SplittingAdvanced Energy Materials, 2016
- Enhanced Photoelectrochemical Solar Water Splitting Using a Platinum-Decorated CIGS/CdS/ZnO PhotocathodeACS Applied Materials & Interfaces, 2015
- Hydrogen evolution from water using AgxCu1−xGaSe2 photocathodes under visible lightPhysical Chemistry Chemical Physics, 2014
- Photoelectrochemical hydrogen production on Cu2ZnSnS4/Mo-mesh thin-film electrodes prepared by electroplatingChemical Physics Letters, 2011
- H2Evolution from Water on Modified Cu2ZnSnS4Photoelectrode under Solar LightApplied Physics Express, 2010