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Regulation of Morphology and Electronic Structure of FeCoNi Layered Double Hydroxides for Highly Active and Stable Water Oxidization Catalysts

Journal Article


Abstract


  • Highly efficient electrocatalysts for the oxygen evolution reaction (OER) are very important for various energy storage and conversion systems such as water splitting devices and metal-air batteries. However, developing OER electrocatalysts with high activity and excellent stability at a high current density remains a considerable challenge. Herein, a facile room-temperature-stirring strategy is described to obtain FeCoNi layered double hydroxide nanocages (FeCoNi-LDHs) using a metal���organic framework as a precursor. The FeCoNi-LDHs have hollow features, while their walls are assembled with ultrathin layered hydroxide nanosheets. By designing a unique structure and tuning the composition, high activity and robust long-term stability of the FeCoNi-LDHs for the OER outperform IrO2, used as the reference catalyst. The as-obtained high electrochemically active surface area and the decreased transfer resistance are ascribed to the significantly improved activity. Density functional theory calculations suggest that the introduction of Fe can fine-tune the electronic structure and decrease the Gibbs free energy difference of the rate-determining step (��G3), improving the intrinsic activity of FeCoNi-LDHs toward the OER. Furthermore, the proposed room-temperature-stirring strategy can be easily scaled up to more than 10 grams of nanocages through a single batch reaction process, demonstrating the large-scale applicability of the catalysts.

UOW Authors


  •   Chou, Shulei (external author)

Publication Date


  • 2021

Citation


  • Zhang, X., Yan, F., Ma, X., Zhu, C., Wang, Y., Xie, Y., . . . Chen, Y. (2021). Regulation of Morphology and Electronic Structure of FeCoNi Layered Double Hydroxides for Highly Active and Stable Water Oxidization Catalysts. Advanced Energy Materials, 11(48). doi:10.1002/aenm.202102141

Scopus Eid


  • 2-s2.0-85119068639

Volume


  • 11

Issue


  • 48

Place Of Publication


Abstract


  • Highly efficient electrocatalysts for the oxygen evolution reaction (OER) are very important for various energy storage and conversion systems such as water splitting devices and metal-air batteries. However, developing OER electrocatalysts with high activity and excellent stability at a high current density remains a considerable challenge. Herein, a facile room-temperature-stirring strategy is described to obtain FeCoNi layered double hydroxide nanocages (FeCoNi-LDHs) using a metal���organic framework as a precursor. The FeCoNi-LDHs have hollow features, while their walls are assembled with ultrathin layered hydroxide nanosheets. By designing a unique structure and tuning the composition, high activity and robust long-term stability of the FeCoNi-LDHs for the OER outperform IrO2, used as the reference catalyst. The as-obtained high electrochemically active surface area and the decreased transfer resistance are ascribed to the significantly improved activity. Density functional theory calculations suggest that the introduction of Fe can fine-tune the electronic structure and decrease the Gibbs free energy difference of the rate-determining step (��G3), improving the intrinsic activity of FeCoNi-LDHs toward the OER. Furthermore, the proposed room-temperature-stirring strategy can be easily scaled up to more than 10 grams of nanocages through a single batch reaction process, demonstrating the large-scale applicability of the catalysts.

UOW Authors


  •   Chou, Shulei (external author)

Publication Date


  • 2021

Citation


  • Zhang, X., Yan, F., Ma, X., Zhu, C., Wang, Y., Xie, Y., . . . Chen, Y. (2021). Regulation of Morphology and Electronic Structure of FeCoNi Layered Double Hydroxides for Highly Active and Stable Water Oxidization Catalysts. Advanced Energy Materials, 11(48). doi:10.1002/aenm.202102141

Scopus Eid


  • 2-s2.0-85119068639

Volume


  • 11

Issue


  • 48

Place Of Publication