Issue

Vol. 15 (2023)

Dual-Doped Nickel Sulfide for Electro-Upgrading Polyethylene Terephthalate into Valuable Chemicals and Hydrogen Fuel

https://doi.org/10.1007/s40820-023-01181-8
Zhijie Chen
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
Renji Zheng
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People’s Republic of China
Teng Bao
School of Biology, Food and Environment Engineering, Hefei University, Hefei 230601, People’s Republic of China
Tianyi Ma
School of Science, STEM College, RMIT University, Melbourne, VIC 3000, Australia
Wei Wei
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
Yansong Shen
School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Bing‑Jie Ni
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia

Corresponding Author: Bing‑Jie Ni

bingjieni@gmail.com

Nano-Micro Letters, Vol. 15 (2023), Article Number: 210

Abstract

Electro-upcycling of plastic waste into value-added chemicals/fuels is an attractive and sustainable way for plastic waste management. Recently, electrocatalytically converting polyethylene terephthalate (PET) into formate and hydrogen has aroused great interest, while developing low-cost catalysts with high efficiency and selectivity for the central ethylene glycol (PET monomer) oxidation reaction (EGOR) remains a challenge. Herein, a high-performance nickel sulfide catalyst for plastic waste electro-upcycling is designed by a cobalt and chloride co-doping strategy. Benefiting from the interconnected ultrathin nanosheet architecture, dual dopants induced up-shifting d band centre and facilitated in situ structural reconstruction, the Co and Cl co-doped Ni3S2 (Co, Cl-NiS) outperforms the single-doped and undoped analogues for EGOR. The self-evolved sulfide@oxyhydroxide heterostructure catalyzes EG-to-formate conversion with high Faradic efficiency (> 92%) and selectivity (> 91%) at high current densities (> 400 mA cm−2). Besides producing formate, the bifunctional Co, Cl-NiS-assisted PET hydrolysate electrolyzer can achieve a high hydrogen production rate of 50.26 mmol h−1 in 2 M KOH, at 1.7 V. This study not only demonstrates a dual-doping strategy to engineer cost-effective bifunctional catalysts for electrochemical conversion processes, but also provides a green and sustainable way for plastic waste upcycling and simultaneous energy-saving hydrogen production.


Highlights:
1 Co and Cl co-doped NiS is an efficient bifunctional electrocatalyst for converting plastic waste into formate and hydrogen with high efficiency and selectivity
2 Dopants regulate the electronic property and accelerate structural reconstruction of NiS for the core ethylene glycol (PET monomer) oxidation reaction
3 PET hydrolysate electrolysis can produce hydrogen gas at an average rate of 50.26 mmol h−1 at 1.7 V

Keywords

Hydrogen energy Electro-upcycling Structural reconstruction Organic waste upcycling d Band centre
Chen, Zhijie, Renji Zheng, Teng Bao, Tianyi Ma, Wei Wei, Yansong Shen, and Bing‑Jie Ni. 2023. “Dual-Doped Nickel Sulfide for Electro-Upgrading Polyethylene Terephthalate into Valuable Chemicals and Hydrogen Fuel”. Nano-Micro Letters 15 (September):210. https://doi.org/10.1007/s40820-023-01181-8.
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