Improved Photoelectrocatalytic Performance for Water Oxidation by Earth-Abundant Cobalt Molecular Porphyrin Complex-Integrated BiVO4 Photoanode

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• 作者：Bin Liu ; Jian Li ; Hao-Lin Wu ; Wen-Qiang Liu ; Xin Jiang ; Zhi-Jun Li ; Bin Chen ; Chen-Ho Tung ; Li-Zhu Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：18577-18583
• 全文大小：395K
• 年卷期：0
• ISSN：1944-8252

文摘

An earth-abundant, low-cost cobalt porphyrin complex (CoTCPP) is designed as a molecular catalyst to work on three-dimensional BiVO₄ film electrode for water oxidation for the first time. Under illumination of a 100 mW cm^–2 Xe lamp, the CoTCPP-functionalized BiVO₄ photoanode exhibits a 2-fold enhancement in photocurrent density at 1.23 V vs RHE and nearly a 450 mV cathodic shift at 0.5 mA cm⁻² photocurrent density relative to bare BiVO₄ in 0.1 M Na₂SO₄ (pH = 6.8). Simultaneously, stoichiometric oxygen and hydrogen are generated with a faradic efficiency of 80% over 4 h. The activity and stability of the BiVO₄ photoanode are dramatically increased by molecular CoTCPP, giving rise to higher performance than previously reported noble metal ruthenium complex-modified BiVO₄ photoanode. By using hydrogen peroxide as the hole scavenger, we demonstrate that molecular CoTCPP catalyst greatly suppresses the hole–electron recombination on the surface of BiVO₄ semiconductor, which offers a promising route toward high efficiency, low cost, practical solar fuel generation device.