Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 11, Pages 13301-13310Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00948
Keywords
photoelectrochemical water oxidation; 3D branched structure; TiO2; NiOOH; contact interface
Funding
- National Natural Science Foundation of China [51702025, 51874050]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Qinglan Project Foundation of Jiangsu Province
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A novel strategy was developed to construct a 3D branched TiO2 photoanode with an ultrathin Al2O3 passivation layer and NiOOH cocatalyst for photoelectrochemical water splitting, showing improved light absorption ability and enhanced stability.
Photoelectrochemical (PEC) water splitting provides an alternative strategy for clean and renewable hydrogen production; however, the practical application is severely limited by the low solar conversion. Herein, a novel and simple strategy has been developed to construct a 3D branched TiO2 photoanode with an ultrathin Al2O3 passivation layer and NiOOH cocatalyst. The structure and properties of the as-obtained photoanodes are explored by X-ray diffraction, Mott-Schottky, electrochemical impedance spectroscopy, and open circuit voltage measurements. The as-obtained BTiO2/Al2O3/NiOOH ternary heterojunction with a high-quality contact interface exhibits improved light absorption ability, an enhanced photocurrent density of 1.42 mA/cm(2) at 1.23 V-RHE, high conversion efficiency (0.44% at 0.80 V-RHE), and excellent stability compared to pristine TiO2 and alone-Al2O3 or NiOOH decorated TiO2 photoanodes. Therefore, this work could offer a new approach to designing and fabricating high-quality contact interfaces between photoelectrodes and various cocatalysts.
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