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Title: Shadow enhanced self-charging power system for wave and solar energy harvesting from the ocean
Authors: Zhang, Qian 
Liang, Qijie 
Nandakumar, Dilip Krishna 
Qu, Hao 
Shi, Qiongfeng 
Alzakia, Fuad Indra
Tay, Darrell Jun Jie
Yang, Lin 
Zhang, Xueping 
Suresh, Lakshmi
Lee, Chengkuo 
Wee, Andrew Thye Shen 
Tan, Swee Ching 
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
Issue Date: 27-Jan-2021
Citation: Zhang, Qian, Liang, Qijie, Nandakumar, Dilip Krishna, Qu, Hao, Shi, Qiongfeng, Alzakia, Fuad Indra, Tay, Darrell Jun Jie, Yang, Lin, Zhang, Xueping, Suresh, Lakshmi, Lee, Chengkuo, Wee, Andrew Thye Shen, Tan, Swee Ching (2021-01-27). Shadow enhanced self-charging power system for wave and solar energy harvesting from the ocean. NATURE COMMUNICATIONS 12 (1). ScholarBank@NUS Repository.
Abstract: Hybrid energy-harvesting systems that capture both wave and solar energy from the oceans using triboelectric nanogenerators and photovoltaic cells are promising renewable energy solutions. However, ubiquitous shadows cast from moving objects in these systems are undesirable as they degrade the performance of the photovoltaic cells. Here we report a shadow-tribo-effect nanogenerator that hybrids tribo-effect and shadow-effect together to overcome this issue. Several fiber-supercapacitors are integrated with the shadow-tribo-effect nanogenerator to form a self-charging power system. To capture and store wave/solar energy from oceans, an energy ball based on the self-charging power system is demonstrated. By harnessing the shadow-effect, i.e. the shadow of the moving object in the energy ball, the charging time shortens to 253.3 s to charge the fiber-supercapacitors to the same voltage (0.3 V) as using pure tribo-effect. This cost-effective method to harvest and store the wave/solar energy from the oceans in this work is expected to inspire next-generation large-scale blue energy harvesting.
ISSN: 20411723
DOI: 10.1038/s41467-021-20919-9
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