跳到主要內容區塊

LiCoO2-Derived Ni-Doped Catalysts for Electrochemical Upcycling of Polyethylene Terephthalate Waste to Formic Acid
源自鈷酸鋰的鎳摻雜催化劑用於聚對苯二甲酸乙二酯 (PET) 廢棄物電化學升級回收至甲酸


Zhaoxi Chen, Gaige Zhang, Huayue Yang, Yun Zhao, An Pei, Peng Wang, Jin Yang, Junxi Zhang, Peilin Sun, Haohang Qin, Junzheng Zhan, Jian Peng, Wei-Hsiang Huang, Linan Zhou, and Guangxu Chen*
https://doi.org/10.1021/acsnano.5c05213
SEED Member: Wei-Hsiang Huang

 

Schematic of a Co catalyst upcycled from spent battery cathodes for PET electro-reforming, illustrating PET hydrolysis, catalyst preparation, electrocatalytic upgrading of hydrolyzates, and KOH recovery via ERSS.

 

Major Contributions
 

1.Spent LiCoO₂ (SLCO) was upcycled into Ni-doped NiCo₂O₄ catalysts, where Ni incorporation modulates Co electronic structure, boosts EG adsorption, lowers charge-transfer resistance, and delivers exceptional EGOR performance with >90% Faradaic efficiency. 

2.The optimized NiCo₂O₄ catalyst achieves high activity in both EGOR and PET-upcycling conditions, reaching 220 mA cm⁻² at 1.50 V vs RHE and enabling an AEM reactor to deliver 173.5 mA cm⁻² with 84.7% FE for formate from PET hydrolysates. 

3.Coupling the catalyst with an electrochemical recovery and separation system (ERSS) enables 98.9% KOH recovery and high product yields (FA 98.4%, PTA 95.8%), increasing economic returns to $440.50 per ton of PET and establishing a closed-loop “waste-to-waste” recycling model.




主要貢獻
 

1.廢棄電池轉化高效催化劑:將廢棄的鈷酸鋰(Spent LiCoO2, SLCO)升級回收為鎳摻雜的鈷酸鎳(Ni-doped NiCo2O4)催化劑。鎳的摻入調節了鈷的電子結構,增強了乙二醇(EG)的吸附能力,降低了電荷轉移電阻,並在乙二醇氧化反應(EGOR)中展現出色的性能,法拉第效率超過 90%。

2.PET 水解產物的高效轉化:優化後的 NiCo2O4 催化劑在 EGOR 和 PET 升級回收條件下均具備高活性。在 $1.50 V (vs RHE) 電位下,電流密度可達 220 mA cm-2。應用於陰離子交換膜(AEM)反應器處理 PET 水解產物時,能以 173.5 mA cm-2 的電流密度和 84.7% 的法拉第效率生成甲酸(Formate)

3.閉環回收系統與經濟效益:結合電化學回收分離系統(ERSS),實現了 98.9% 的 KOH 回收率以及高產物產率(甲酸 FA 98.4%,對苯二甲酸 PTA 95.8%)。此系統將每噸 PET 的經濟回報提升至 440.50 美元,成功建立了一個閉環的「以廢治廢(waste-to-waste)」回收模式。