Premium
Silicon Photoanode Modified with Work‐function‐tuned Ni@Fe y Ni 1− y (OH) 2 Core‐Shell Particles for Water Oxidation
Author(s) -
Liu Duanduan,
Jiang Tong,
Liu Depei,
Zhang Weining,
Qin Hao,
Yan Shicheng,
Zou Zhigang
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002049
Subject(s) - electrolyte , materials science , work function , absorption (acoustics) , water splitting , catalysis , band bending , analytical chemistry (journal) , irradiation , chemical engineering , electrode , layer (electronics) , nanotechnology , photocatalysis , chemistry , optoelectronics , composite material , physics , biochemistry , chromatography , engineering , nuclear physics
The photoelectrochemical (PEC) water splitting determines by the light absorption and charge extraction/injection. Here, we dispersedly modified the core‐shell structured Ni@Ni y Fe 1− y (OH) 2 on Si photoanodes and in‐situ electrochemically converted it to Ni@Ni y Fe 1− y OOH to form a Si/SiO x /Ni@Ni y Fe 1− y OOH assembly, exhibiting the adjustable band bending and catalytic ability in water oxidation depending closely on the composition of Ni y Fe 1− y OOH. Combining with the island‐like dispersed distribution to maximize the light absorption and the Ni@Ni y Fe 1− y shell as a high work function and a catalytic layer to simultaneously enlarge charge extraction and injection, the Si/SiO x /Ni@Ni 0.7 Fe 0.3 OOH assembly achieved an onset potential of 1.0 V RHE , a saturated current density of 35.4 mA cm −2 and a more than 50 h stability in an electrolyte with pH 9 under AM1.5G simulated sunlight irradiation. Our findings suggested that regulating the charge energetics at Si‐electrolyte interface by discontinuously modifying a composition‐adjustable core‐shell structure is a potential route to develop highly efficient PEC devices.