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Carbon Encapsulation of Organic–Inorganic Hybrid Perovskite toward Efficient and Stable Photo‐Electrochemical Carbon Dioxide Reduction
Author(s) -
Zhang Hefeng,
Chen Yu,
Wang Hong,
Wang Hui,
Ma Weiguang,
Zong Xu,
Li Can
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202002105
Subject(s) - photocathode , materials science , photocurrent , energy conversion efficiency , electrochemical reduction of carbon dioxide , electrochemistry , chemical engineering , faraday efficiency , reversible hydrogen electrode , perovskite (structure) , nanotechnology , electrode , catalysis , optoelectronics , electron , working electrode , chemistry , organic chemistry , carbon monoxide , engineering , physics , quantum mechanics
Photo‐electrochemical (PEC) carbon dioxide reduction to chemicals or fuels has been regarded as an attractive strategy that can close the anthropogenic carbon cycle. However, identifying a PEC system capable of driving efficient and durable CO 2 conversion remains a critical challenge. Herein, the fabrication of a sandwich‐like organic–inorganic hybrid perovskite‐based photocathode with carbon encapsulation for PEC CO 2 reduction is reported. The carbon encapsulation not only affords protection to the perovskite, but also allows for efficient conductance of photogenerated electrons. When decorated with a cobalt phthalocyanine molecular catalyst, the photocathode shows an onset potential at 0.58 V versus reversible hydrogen electrode (RHE) and a high photocurrent density of −15.5 mA cm −2 at −0.11 V versus RHE in CO 2 ‐saturated 0.5 m KHCO 3 under AM 1.5G illumination (100 mW cm −2 ), which represents state‐of‐the‐art performance in this field. Moreover, the photocathode remains stable during a continuous reaction that lasted for 25 h. Unbiased PEC CO 2 reduction is further realized by integrating the photocathode with an amorphous Si photoanode in tandem, delivering a solar‐to‐CO energy conversion efficiency of 3.34% and a total solar‐to‐fuel energy conversion efficiency of 3.85%.