Co3O4-Decorated Hematite Nanorods As an Effective Photoanode for Solar Water Oxidation

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• 作者：Lifei Xi ; Phong D. Tran ; Sing Yang Chiam ; Prince Saurabh Bassi ; Wai Fatt Mak ; Hemant Kumar Mulmudi ; Sudip K. Batabyal ; James Barber ; Joachim Say Chye Loo ; Lydia Helena Wong
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：July 5, 2012
• 年：2012
• 卷：116
• 期：26
• 页码：13884-13889
• 全文大小：350K
• 年卷期：v.116,no.26(July 5, 2012)
• ISSN：1932-7455

文摘

In this Article, we report a strategy to perform in situ incorporation of oxygen evolution catalyst, Co₃O₄, during hydrothermal growth of Fe₂O₃ nanorod arrays. It was found that the highest photocurrent increase and onset potential shift was observed with 5% Co²⁺. The photocurrent density increases from 0.72 for the pristine Fe₂O₃ nanorod to 1.20 mA/cm² at 1.23 V versus RHE (i.e., 67% improvement) with 5% Co²⁺ added. Concomitant with this improvement was a shift in the onset potential by 40 mV and improvements in incident-photon-to-current efficiencies and oxygen evolution. Hematite photoanodes with in situ deposition of Co₃O₄ nanoparticles showed better performance than those prepared by ex situ procedures because of high surface roughness, larger Co₃O₄/hematite interfacial area, and smaller Co₃O₄ particle size.