Solar‐Driven Photoelectrochemical Upcycling of Polyimide Plastic Waste with Safe Green Hydrogen Generation

Author:

Zhao Hu1ORCID,Zhao Xin2,Zhang Jiajia3,Anandita Shafira3,Liu Wen3,Koh See Wee1,Yu Shuyan4,Li Congju45,Chen Zhong2,Xu Rong3,Zou Zhigang6,Tu Wenguang6,Li Hong1ORCID

Affiliation:

1. School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

2. School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

3. School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

4. School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

5. College of Textiles Donghua University Shanghai 201620 China

6. School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong 518172 China

Abstract

AbstractArbitrary disposal of plastic waste into landfills and oceans can disturb the ecological system and even challenge human survival. Centralized plastic recycling process only works for selected types of plastics (e.g., polyethylene) with limited contribution (<10%), because of high infrastructure requirement. Comparatively, photoreforming of plastic waste for commodity and fuels production is much more facile and decentralizable, and thus holds great potential to mitigate the plastic waste challenge. To this end, a fully solar powered photoelectrochemical system is developed to selectively upgrade polyimide waste (often appears in electronic waste) into valuable commodity chemicals, including succinic acid, acetic acid, and formic acid, and cogenerating green hydrogen fuels. It is also demonstrated that one of the key monomer, pyromellitic acid, and the precious metals (in electronic waste) can be fully recycled. This proof‐of‐concept demonstration provides a new viewpoint for designing decentralized photoelectrochemical system for simultaneous plastic waste upcycling and renewable fuel synthesis, critical for a sustainable plastic economy. Selective cleavage of benzene ring also opens a green route for other benzene ring‐containing waste upgrading.

Funder

Nanyang Technological University

Natural Science Foundation of Shenzhen Municipality

Shenzhen Key Laboratory Fund

Guangdong Provincial Introduction of Innovative Research and Development Team

National Natural Science Foundation of China

Science and Engineering Research Council

Publisher

Wiley

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