Journal
NANO-MICRO LETTERS
Volume 12, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00422-4
Keywords
WO3; BiVO4 heterojunction; Photoelectrochemical hydrogen generation; Triboelectric nanogenerator; Mechanical energy; Solar energy
Funding
- National Natural Science Foundation of China (NSFC) [61804103, U1932124]
- National Science and Technology Major Project from Minister of Science and Technology of China [2018AAA0103104]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJA535001]
- Natural Science Foundation of Jiangsu Province of China [BK20170343, BK20180242]
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University [KJS1803]
- XJTLU Key Programme Special Fund [KSF-A-18]
- Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology (CUMT)
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
- 111 Project
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Photoelectrochemical hydrogen generation is a promising approach to address the environmental pollution and energy crisis. In this work, we present a hybridized mechanical and solar energy-driven self-powered hydrogen production system. A rotatory disc-shaped triboelectric nanogenerator was employed to harvest mechanical energy from water and functions as a sufficient external power source. WO3/BiVO4 heterojunction photoanode was synthesized in a PEC water-splitting cell to produce H-2. After transformation and rectification, the peak current reaches 0.1 mA at the rotation speed of 60 rpm. In this case, the H-2 evolution process only occurs with sunlight irradiation. When the rotation speed is over 130 rpm, the peak photocurrent and peak dark current have nearly equal value. Direct electrolysis of water is almost simultaneous with photoelectrocatalysis of water. It is worth noting that the hydrogen production rate increases to 5.45 and 7.27 mu L min(-1) without or with light illumination at 160 rpm. The corresponding energy conversion efficiency is calculated to be 2.43% and 2.59%, respectively. All the results demonstrate such a self-powered system can successfully achieve the PEC hydrogen generation, exhibiting promising possibility of energy conversion.
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