Abstract
AbstractThis article describes the preparation of copper tungstate ( )‐based heterostructured nanocomposites by facile two‐step polyol assisted hydrothermal‐annealed process. A series of characterization techniques (FESEM, EDS, HRTEM, XPS, XRD and FTIR etc.) were confirmed the formation of type‐I ) and type‐II heterojunction as function of pH and annealing temperatures. Also , , , and CuO were found as secondary phases with . These nanocomposites exhibited the enhanced visible light absorption and the band gap (ca. 1.7 eV) of is smaller than the early reported value (2.1‐2.3 eV). In photocatalytic degradation, the / and were showed 1.66 fold times higher and nearly equal apparent rate constant respectively than that of . In photoelectrochemical (PEC) studies, the , / , and nanocomposites showed more photocurrent density of 3.5, 2.2, 0.71 and 0.41 mA/cm2 at 1.23 VRHE respectively than CuWO4. The existence of dual co‐catalysts (Cu2O and CuO) with CuWO4, strongly promote the electron‐hole pair separation and migration. Among the nanocomposite, the was showed the similar static photocurrent as that of under 1 Sun illumination. The advantage of present work is noble‐metal‐free photocatalysts prepared with binder free, less time, low energy consumption and cost, and environmental benign.
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