Loading Ni(OH)2 on the Ti-doped hematite photoanode for photoelectrochemical water splitting. (10th February 2015)

• Record Type: Journal Article
• Authors: Li, Qian; Bian, Juncao; Zhang, Ning; Ng, Dickon H.L.
• Is Part Of: Electrochimica acta. Volume 155(2015)
• Page Start: 383
• Page End: 390
• Publication Date: 2015-02-10
• Subjects: Hematite -- Ti doping -- Ni(OH)2 -- Heterostructures -- Photoelectrochemical water splitting; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2014.12.131
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Ni(OH)2 /Ti-Fe2 O3 photoanode was fabricated by a two-step hydrothermal method. Ti doping had promoted the photovoltage of hematite by surface modification. The loading of Ni(OH)2 improved the PEC of Ti-Fe2 O3 as an effective OER catalyst. Abstract: Ni(OH)2 /Ti-Fe2 O3 photoanode was fabricated by a two-step hydrothermal method. The product showed a photocurrent density of 0.39 mA/cm 2 at 1.23 V vs RHE. It was found that the Ti doping had promoted the photovoltage of hematite by surface modification rather than increasing donor density. The loading of Ni(OH)2 had further improved the photoelectrochemical performance of Ti-Fe2 O3 via reducing both overpotential of oxygen evolution reaction and the recombination rate of the charge carriers. Moreover, the Ni(OH)2 content could be optimized to avoid light blocking effect due to excessive Ni(OH)2 loading. This confirms that Ni(OH)2 /Ti-Fe2 O3 could be a promising material for photoelectrochemical water splitting.