Silicon Photoanode Modified with Work‐function‐tuned Ni@FeyNi1−y(OH)2 Core‐Shell Particles for Water Oxidation. Issue 22 (16th October 2020)

• Record Type: Journal Article
• Authors: Liu, Duanduan; Jiang, Tong; Liu, Depei; Zhang, Weining; Qin, Hao; Yan, Shicheng; Zou, Zhigang
• Is Part Of: ChemSusChem. Volume 13:Issue 22(2020)
• Page Start: 6037
• Page End: 6044
• Publication Date: 2020-10-16
• Subjects: band bending -- core-shell structure -- inhomogeneous modification -- n-Si photoanodes -- photoelectrochemical water oxidation; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202002049
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: 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 Fe1− y (OH)2 on Si photoanodes and in‐situ electrochemically converted it to Ni@Ni y Fe1− y OOH to form a Si/SiO x /Ni@Ni y Fe1− y OOH assembly, exhibiting the adjustable band bending and catalytic ability in water oxidation depending closely on the composition of Ni y Fe1− y OOH. Combining with the island‐like dispersed distribution to maximize the light absorption and the Ni@Ni y Fe1− y shell as a high work function and a catalytic layer to simultaneously enlarge charge extraction and injection, the Si/SiO x /Ni@Ni0.7 Fe0.3 OOH assembly achieved an onset potential of 1.0 VRHE, 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. Abstract : Shell tuning : The core‐shell structured Si/SiO x /Ni@Ni y Fe1− y (OH)2 photoanode is tuned by its adjustable composition of the Ni@Ni y Fe1− y OOH shell to enhance the photoelectrochemical performance.