A Glass-Ceramic with Accelerated Surface Reconstruction toward the Efficient Oxygen Evolution Reaction

The effective non-precious metal catalysts toward the oxygen evolution reaction (OER) are highly desirable for electrochemical water splitting. Herein, we prepare a novel glass-ceramic (Ni1.5Sn@triMPO(4)) by embedding crystalline Ni1.5Sn nanoparticles into amorphous trimetallic phosphate (triMPO(4)) matrix. This unique crystalline-amorphous nanostructure synergistically accelerates the surface reconstruction to active Ni(Fe)OOH, due to the low vacancy formation energy of Sn in glass-ceramic and high adsorption energy of PO43- at the V-O sites. Compared to the control samples, this dual-phase glass-ceramic exhibits a remarkably lowered overpotential and boosted OER kinetics after surface reconstruction, rivaling most of state-of-the-art electrocatalysts. The residual PO43- and intrinsic V-O sites induce redistribution of electron states, thus optimizing the adsorption of OH* and OOH* intermediates on metal oxyhydroxides and promoting the OER activity.

Automated summary

The novel glass-ceramic material with a unique crystalline-amorphous nanostructure synergistically accelerates surface reconstruction, showcasing excellent oxygen evolution reaction activity and potential as an efficient non-precious metal catalyst.