1. Flower-like MOF-74 nanocomposites directed by selenylation towards high-efficient oxygen evolution.
- Author
-
Zhang, Xin, Pan, Hongwei, Jia, Yubao, Zhang, Yao, Jiang, Zhigang, Li, Chunjie, Li, Xu, Bao, Lihong, Ma, Ruguang, and Wang, Kuikui
- Subjects
- *
OXYGEN evolution reactions , *HYDROGEN evolution reactions , *NANOCOMPOSITE materials , *METAL-organic frameworks , *SURFACE reconstruction , *CHEMICAL kinetics , *ELECTROCATALYSTS - Abstract
[Display omitted] Sluggish kinetics of the oxygen evolution reaction during the water splitting requires high-performance electrocatalysts with low cost and good stability. Metal-organic frameworks (MOFs) have attracted much attention as electrocatalysts owing to their unique properties. To improve their electrocatalytic activity and stability, we report a selenylation method to modulate the morphology and interfaces by forming flower-like MOF-selenide nanocomposites. The optimal sample exhibits high activity with an overpotential of 260 mV at 10 mA cm−2, much better than commercial RuO 2 and the control samples. Moreover, the optimal sample has the lowest Tafel slope of 54.3 mV dec-1, indicating the fast reaction kinetics, which can be attributed to the lower charge-transfer resistance and high intrinsic activity. Chronoamperometry shows that the optimal sample can maintain the current density for 60 h at 10 mA cm−2 after the initial surface reconstruction, demonstrating good stability. This study provides a new perspective on the development of highly efficient electrocatalysts based on polymetallic MOFs. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF