Boosting the Activity and Stability of Copper Tungsten Nanoflakes toward Solar Water Oxidation by Iridium-Cobalt Phosphates Modification

Catalysts

卷:10

Peng Diao¹  Chao Li¹ 

[1] Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

关键词: photoelectrochemical water oxidation;    copper tungsten;    iridium–cobalt phosphates;    cocatalyst;    interfaces;   

DOI  :  10.3390/catal10080913

来源: DOAJ

【 摘 要 】

Severe interfacial electron–hole recombination greatly limits the performance of CuWO₄ photoanode towards the photoelectrochemical (PEC) oxygen evolution reaction (OER). Surface modification with an OER cocatalyst can reduce electron–hole recombination and thus improve the PEC OER performance of CuWO₄. Herein, we coupled CuWO₄ nanoflakes (NFs) with Iridium–cobalt phosphates (IrCo-Pi) and greatly improved the photoactivity of CuWO₄. The optimized photocurrent density for CuWO₄/IrCo-Pi at 1.23 V vs. reversible hydrogen electrode (RHE) rose to 0.54 mA∙cm⁻², a ca. 70% increase over that of bare CuWO₄ (0.32 mA∙cm⁻²). Such improved photoactivity was attributed to the enhanced hole collection efficiency, which resulted from the reduced charge-transfer resistance via IrCo-Pi modification. Moreover, the as-deposited IrCo-Pi layer well coated the inner CuWO₄ NFs and effectively prevented the photoinduced corrosion of CuWO₄ in neutral potassium phosphate (KPi) buffer solution, eventually leading to a superior stability over the bare CuWO₄. The facile preparation of IrCo-Pi and its great improvement in the photoactivity make it possible to design an efficient CuWO₄/cocatalyst system towards PEC water oxidation.

【 授权许可】

Unknown