Rational design and construction of hollow structured hybrid electrocatalysts are impressive for efficient and sustainable water splitting process. This study emphasizes a MOF-based self-templating approach to synthesize NiSe 2 −FeSe double-shelled hollow polyhedrons (DHPs) for efficient oxygen evolution reaction (OER) in alkaline solutions. Starting from MIL-88A, this study demonstrates a self-templating approach followed by etching, coprecipitation, and selenization treatments to construct NiSe 2 −FeSe DHPs. Due to the doubleshelled hollow structure and compositional merits, the resulting NiSe 2 −FeSe DHPs exhibit excellent OER performance with a small overpotential of 280 mV to reach a current density of 10 mA cm −2 , a small Tafel slope of 58 mV dec −1 , and outstanding stability (over 88% current retention for at least 24 h), which significantly outperforms the benchmark RuO 2 catalyst. The notable improvement in efficiency along with stability is attributed to abundant electrocatalytic active sites, large surface area, and the synergistic effect of heterostructure interfaces.

A rational design and cost-effective transition metal-based hollow nanostructures are important for sustainable energy materials with high efficiency. This study reports that the carbon-incorporated Ni2P-Fe2P hollow nanorods ((Ni,Fe)2P/C HNRs) derived...

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