1 research outputs found
Mn-Incorporation-Induced Phase Transition in Bottom-Up Synthesized Colloidal Sub-1-nm Ni(OH)<sub>2</sub> Nanosheets for Enhanced Oxygen Evolution Catalysis
Sub-1-nm structures are attractive for diverse applications
owing
to their unique properties compared to those of conventional nanomaterials.
Transition-metal hydroxides are promising catalysts for oxygen evolution
reaction (OER), yet there remains difficulty in directly fabricating
these materials within the sub-1-nm regime, and the realization of
their composition and phase tuning is even more challenging. Here
we define a binary-soft-template-mediated colloidal synthesis of phase-selective
Ni(OH)2 ultrathin nanosheets (UNSs) with 0.9 nm thickness
induced by Mn incorporation. The synergistic interplay between binary
components of the soft template is crucial to their formation. The
unsaturated coordination environment and favorable electronic structures
of these UNSs, together with in situ phase transition
and active site evolution confined by the ultrathin framework, enable
efficient and robust OER electrocatalysis. They exhibit a low overpotential
of 309 mV at 100 mA cm–2 as well as remarkable long-term
stability, representing one of the most high-performance noble-metal-free
catalysts