4.8 Article

Self-Templated Synthesis of CoFeP @ C Cage-In-Cage Superlattices for Enhanced Electrocatalytic Water Splitting

Journal

ADVANCED ENERGY MATERIALS
Volume 12, Issue 43, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202202394

Keywords

heterometallic phosphides; nanocages; nanocrystal superlattices; self-templated synthesis; water splitting

Funding

  1. National Key Research and Development Program of China [2020YFB1505803]
  2. NSFC [22025501, 22088101, 21872038, 21733003, 51773042, 51973040, 52003056, 52202088]
  3. Shanghai International Science and Technology Cooperation Project [21520713800]
  4. Foshan Science and Technology Innovation Program [2017IT100121]
  5. Fundamental Research Funds for the Central Universities [20720220010]

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In this study, a self-templated strategy is used to fabricate 2D porous electrocatalysts of heterometallic phosphides, which exhibit remarkable activity and stability for water splitting in alkaline media.
Designing highly-efficient, cost-effective, and stable electrocatalysts for water splitting is of great significance for implementing renewable energy technologies. Herein, a self-templated strategy is employed to fabricate 2D porous electrocatalysts of heterometallic phosphides featuring a cage-in-cage superlattice architecture. The as-made heterometallic phosphide electrocatalysts, comprising a layer of close-packed CoFeP nanocages intimately embedded in an interconnected carbon-cage framework, are converted from carbon-coated CoFeO nanocrystal superlattices by one-step phosphidation. Benefiting from the unique hierarchical porous structure and the ability of modulating the Co/Fe molar ratio, such 2D CoFeP @ C cage-in-cage superlattices show remarkable activity and stability for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. Moreover, water electrolyzers constructed using CoFeP @ C superlattices as both cathode and anode require a low cell voltage of 1.55 V to achieve a current density of 10 mA cm(-2), outperforming most nonprecious metal-based electrocatalysts reported previously. The superior electrocatalytic performance of CoFeP @ C superlattices is revealed by density functional theory calculations. These findings provide new opportunities for developing efficient and stable bifunctional electrocatalysts for water splitting.

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