· 논문명 : Oxygen vacancies promoted W–O–Mo interfacial bonding for stable CuWO4 photoanodes

                with accelerated charge transfer

· 저   자 : Nam Le1, Tam Van Tran1, Thanh Truong Dang, Jin Suk Chung, Won Mook Choi*,

                Seung Hyun Hur*

· 게재지 : International Journal of Hydrogen Energy (2026, 204, 153307)

· 초록

Since Pt cocatalysts play an important role in photocatalytic H2 evolution, it is necessary to track Pt over Pt/g-C3N4 catalysts 

Recently, CuWO4 has garnered significant attention as an oxygen-evolution photoanode for photoelectrochemical water splitting

(PEC). However, the sluggish surface oxygen evolution reaction (OER) kinetics and the photocorrosion from tungsten ion 

leaching remain significant challenges. Herein, we construct an oxygen-vacancy-rich CuWO4 (CW-R) photoanode bridged to a

Mo-doped CoP (MoCoP) cocatalyst with bulk g-C3N4 (CN) serving as a supported material in the CN/MoCoP composite. 

Oxygen vacancies on CuWO4 are expected to promote interfacial W–O–Mo “bridge” bonds that both chemically anchor the

cocatalyst and create atomic-level charge transfer channels, which strengthen the interfacial contact quality between 

cocatalyst CuWO4 and lower the interfacial carrier-transport barrier. The CW-R/CN/MoCoP photoelectrode achieves outstanding

PEC performance of 0.51 mA cm-2 at 1.23 V versus the reversible hydrogen electrode (RHE), which is 3 times higher than 

pristine CW-R. Chronoamperometry combined with ICP-OES confirms 4-folds reduction in tungsten leaching, while gas 

chromatography quantifies near-steady Faradaic efficiencies (~90 %). This study demonstrates the role of W–O–Mo interfacial

chemical bonds, combined with a CN-supported material, as an effective interfacial design to simultaneously suppress 

photocorrosion and accelerate the charge extraction channel in CuWO4 photoanodes, thereby facilitating the construction of 

durable, high-efficiency PEC water splitting devices.