Transcription methodology for rationally designed morphological complex metal oxides: A versatile strategy for improved electrocatalysis

Complex metal oxides such as 3D perovskites, known for their high activity and stability, are traditionally synthesized at high temperatures leaving little scope for morphological tuning using structure-directing and high-temperature...

Hollow cuboidal MnCo2O4coupled with nickel phosphate: A promising oxygen evolution reaction electrocatalyst

The growth of hierarchical morphologies of complex metal oxides directly onto the substrate is a challenging task. Here in we report, unique hollow-cuboidal MnCo2O4 (h-MCO) morphology that offers insights into...

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Oxygen vacancies in complex metal oxides and specifically in perovskites are demonstrated to significantly enhance their electrocatalytic activities due to facilitating a degree of control in the material’s intrinsic properties. The reported enhancement in intrinsic OER activity of oxygen-deficient perovskites surfaces has inspired their fabrication via a myriad of schemes. Oxygen vacancies in perovskites are amongst the most favorable anionic or Schottky defects to be induced due to their low formation energies. This review discusses recent efforts for inducing oxygen vacancies in a multitude of perovskites, including facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of perovskite electrocatalysts. Experimental, analytical, and computational techniques dedicated to the understanding of the improvement of OER activities upon oxygen vacancy induction are summarized in this work. The identification and utilization of intrinsic activity descriptors for the modulation of configurational structure, improvement in bulk charge transport, and favorable inflection of the electronic structure are also discussed. It is our foresight that the approaches, challenges, and prospects discussed herein will aid researchers in rationally designing highly active and stable perovskites that can outperform noble metal-based OER electrocatalysts.

Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

<p>Nb₁₈W₈O₆₉ (9Nb₂O₅×8WO₃) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (<i>cs</i>) structures within the Nb₂O₅–WO₃ series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 x 5 units of corner-shared MO₆ octahedra between the shear planes, giving rise to 2 nm x 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and ⁷Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity with Li diffusivities at 298 K predominantly between 10^–10 and 10^–12 m²·s^–1. In addition to its promising rate capability, Nb₁₈W₈O₆₉ adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.</p>

Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

<p>Nb₁₈W₈O₆₉ (9Nb₂O₅×8WO₃) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (<i>cs</i>) structures within the Nb₂O₅–WO₃ series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 x 5 units of corner-shared MO₆ octahedra between the shear planes, giving rise to 2 nm x 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and ⁷Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity with Li diffusivities at 298 K predominantly between 10^–10 and 10^–12 m²·s^–1. In addition to its promising rate capability, Nb₁₈W₈O₆₉ adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.</p>

Emerging investigator series: first-principles and thermodynamics comparison of compositionally-tuned delafossites: cation release from the (001) surface of complex metal oxides

For a set of compositionally tuned complex metal oxides we predict the thermodynamics of aqueous surface transformations that lead to metal release.

The use of mixed-metal single source precursors for the synthesis of complex metal oxides

This Feature Article highlights the use of mixed-metal single source precursors to directly access useful complex metal oxide materials.

Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

Nb18W8O69 (9Nb2O5×8WO3) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (cs) structures within the Nb2O5–WO3 series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 ´ 5 units of corner-shared MO6 octahedra between the shear planes, giving rise to 2 nm ´ 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and 7Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity. In addition to its promising rate capability, Nb18W8O69 adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.