1. Operando spectroscopies unveil interfacial FeOOH induced highly reactive β-Ni(Fe)OOH for efficient oxygen evolution.
- Author
-
Li, Ying, Wu, Yanyan, Yuan, Mengke, Hao, Hongru, Lv, Zhe, Xu, Lingling, and Wei, Bo
- Subjects
- *
OXYGEN evolution reactions , *RAMAN spectroscopy , *OXYGEN electrodes , *LAYERED double hydroxides , *ULTRAVIOLET-visible spectroscopy , *CHARGE transfer - Abstract
Interfacial engineering is an effective strategy for the design of active oxygen evolution electrode. Yet the intrinsic mechanism of heterogeneous interfaces remains largely unclear for the lack of direct evidence of real active phases. Herein, operando ultraviolet-visible (UV–vis) and Raman spectroscopies were used to probe the surface reconstruction behaviors of FeOOH@NiFe layered double hydroxides (LDH) hybrid catalysts, which revealed that FeOOH@NiFe LDH was converted into highly active FeOOH@ β-Ni(Fe)OOH phases during the OER process. The FeOOH-NiFe LDH interface can promote interfacial charge transfer, delay the Ni oxidation and induce the NiFe LDH phases to highly reactive β-Ni(Fe)OOH. The FeOOH@ β-Ni(Fe)OOH exhibited excellent OER performance (252 mV at 100 mA cm−2) and a 1.6 times increase (at overpotential of 300 mV) in turnover frequency (TOF) with respect to the active phase γ-Ni(Fe)OOH of NiFe LDH. This work clarifies that ration interface engineering can regulate the generation of highly active phases in the OER process. [Display omitted] • Reconstruction of FeOOH@NiFe LDH was study by operando UV–vis and Raman spectroscopies. • FeOOH induced the phase transformation of NiFe LDH to β-Ni(Fe)OOH at the interface. • The interfacial electric field of NiFe LDH and FeOOH promoted the charge transfer. • As-formed FeOOH@ β-Ni(Fe)OOH showed superior OER activity to γ-Ni(Fe)OOH. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF