Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008277
Keywords
defect engineering; hydrogen evolution; organometal halide perovskites; photocathodes; photoelectrochemical reactions; water splitting; zwitterions
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Funding
- Global Research Laboratory (GRL) Program of the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning (MSIP) [NRF-2017K1A1A2013153]
- Technology Development Program to Solve Climate Changes of the NRF - MSIT [NRF-2020M1A2A2080748]
- NRF - MSIT [2020R1A2C1005590]
- GIST Research Institute (GRI), RISE - GIST
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This study presents a highly efficient and stable organometal halide perovskite (OHP) based photocathode achieved through a new zwitterion passivation and eutectic gallium indium alloy (EGaIn) encapsulation method, leading to improved power conversion efficiency and stability. The photocathodes show less than 5% current loss between photovoltaic cells and photoelectrochemical cells, and demonstrate the highest stability over 54 hours under continuous full sunlight illumination in a sulfuric acid electrolyte.
Although organometal halide perovskites (OHPs) have desirable photovoltaic properties, their photoelectrochemical (PEC) water-splitting application for hydrogen production is limited by the instability originating from their intrinsic ionic defects and hygroscopic vulnerability. Herein, a highly efficient and stable OHP-based photocathode achieved by a new zwitterion (L-proline) passivation and a eutectic gallium indium alloy (EGaIn) encapsulation method is described. The zwitterion, which has both cations and anions, can simultaneously passivate both positively and negatively charged defects in OHPs. The resulting OHP photovoltaic cells with passivated shows an over 20% power conversion efficiency with an open-circuit voltage of 1.13 V and a short-circuit current of 22.13 mA cm(-2). The EGaIn-incorporated Ti foil provides complete encapsulation from the external environment while maintaining good transport of photogenerated charges from OHPs. Thus, these photocathodes exhibit a remarkable average photocurrent density of 21.2 mA cm(-2) which has less than 5% current loss between PV cells and PEC cells. More admirably, the photocathode has the highest stability over 54 hours under continuous full sunlight illumination in a sulfuric acid electrolyte.
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