NiSe₂–FeSe Double-Shelled Hollow Polyhedrons as Superior Electrocatalysts for the Oxygen Evolution Reaction

Abstract

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.

Hollow Heterostructured Nanocatalysts for Boosting Electrocatalytic Water Splitting

“…Bearing these considerations into mind, intensive efforts have been devoted to the fabrication of hollow heterostructured selenides to enable them as advanced OER and HER electrocatalysts. For example, Kim et al [122] . have synthesized the NiSe 2 −FeSe double‐shelled hollow polyhedrons by employing MIL‐88 A as a sacrificial template (Figure 8a–c).…”

“…Bearing these considerations into mind, intensive efforts have been devoted to the fabrication of hollow heterostructured selenides to enable them as advanced OER and HER electrocatalysts. For example, Kim et al [122] have synthesized the NiSe 2 À FeSe double-shelled hollow polyhedrons by employing MIL-88 A as a sacrificial template (Figure 8a-c). Benefitting from the uniform double-shelled morphology and heterostructured compositions, the as-prepared NiSe 2 À FeSe can afford more active centers and improve the electrical conductivity to promote the charge transfer efficiency.…”

Carbon-incorporated Ni2P–Fe2P hollow nanorods as superior electrocatalysts for the oxygen evolution reaction

“…25,26 Hollow structures derived from MOFs with tunable compositions generally show excellent electrochemical performance. 27,28…”

“…25,26 Hollow structures derived from MOFs with tunable compositions generally show excellent electrochemical performance. 27,28 Here, we report the synthesis of carbon-incorporated Ni 2 P-Fe 2 P hollow nanorods ((Ni,Fe) 2 P/C HNRs) using a Ni 2 (BDC) 2 (DABCO) MOF (Ni-MOF) as a sacrificial template. (Ni,Fe) 2 P/C HNRs display excellent OER performance in an alkaline solution, with a small overpotential and outstanding electrochemical durability.…”

Recent advances in hollow nanomaterials with multiple dimensions for electrocatalytic water splitting

“…[37][38][39] The self-template method is used to directly synthesize hollow structures without additional templates. 40,41 With the development of nanotechnology, the distinctions between these three methods are still unclear, and the three methods can be used individually or simultaneously. Many predecessors have made important discussions on the structural design, synthesis method, application and detection of hollow materials.…”