“Uncapped” metal–organic framework (MOF) dispersions driven by O 2 plasma towards superior oxygen evolution electrocatalysis

The lack of solution processability of metal–organic frameworks (MOFs) has been a major obstacle hampering their practical applications. At present, a common belief is that the solution processability of MOFs can only be improved by functionalization with foreign stabilizers. In this work, we firstl...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-10, Vol.10 (39), p.20813-20818
Hauptverfasser: Ding, Shan, Zhang, Yuxiang, Lou, Fengqian, Aslam, Muhammad Kashif, Sun, Yuntong, Li, Ming, Duan, Jingjing, Li, Yibing, Chen, Sheng
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The lack of solution processability of metal–organic frameworks (MOFs) has been a major obstacle hampering their practical applications. At present, a common belief is that the solution processability of MOFs can only be improved by functionalization with foreign stabilizers. In this work, we firstly predicted through density functional theory (DFT) that in case of a slight excess of the oxygen percentage of MOFs (∼15%), the ionization of additional hydroxyl groups on the surface of MOFs can greatly enhance the solution dispersibility of MOFs through electrostatic stabilization. We consequently demonstrated a general protocol for manipulating MOFs' solution processability through O 2 plasma treatment (0–40 min), which can continuously adjust their surface charge in aqueous dispersions (zeta potentials: −13.3–−29.4 mV). This has resulted in a class of “uncapped” MOF aqueous colloids. Further size fractionation of these MOFs in aqueous colloids has produced small-sized MOFs with superior electrocatalytic performance towards the oxygen evolution reaction (overpotential of 258 mV at 10 mA cm −2 , small Tafel slope of 19 mV dec −1 , and strong durability up to 100 h).
ISSN:2050-7488
2050-7496
DOI:10.1039/D2TA05387J