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Enhanced Photoelectrochemical Performance of WO3-Based Composite Photoanode Coupled with Carbon Quantum Dots and NiFe-Layered Double Hydroxide.

WO3, one of the attractive photoanode materials, has still suffered from the limited visible light absorption capability and sluggish surface reaction kinetics, as well as poor stability in neutral electrolyte. Herein, we design and fabricate NiFe/CQD/WO3 composite photoanode with loading CQDs and electrodepositing NiFe-LDH. The NiFe/CQD/WO3 photoanode obtains photocurrent density of 1.43 mA/cm2 at 1.23 VRHE, which is about three times as high as that of bare WO3. During the test period of 3 h, the stability of WO3 is substantially improved after loading cocatalysts. Furthermore, the mechanism insights of favored band structure and beneficial charge-transfer pathway elucidate the high PEC performance of NiFe/CQD/WO3 composite photoanode.