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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Glassy State Hydroxide Materials for Oxygen Evolution Electrocatalysis.

Jing Wang1, Jingyu Chen1, Jian Zhang1

  • 1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, Hubei, 430074, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 20, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel glassy hydroxide catalyst for the oxygen evolution reaction (OER). This disordered material exhibits enhanced catalytic activity, outperforming traditional crystalline catalysts and noble metal benchmarks.

Keywords:
disordered structureelectrocatalytic activityglassy statehydroxideoxygen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Hydroxides are layered crystals with metal-oxygen octahedra, studied as oxygen evolution reaction (OER) catalysts.
  • High crystallinity in hydroxides leads to limited exposed metal sites and reduced electrocatalytic activity.

Purpose of the Study:

  • To develop a glassy state hydroxide material with short-range order and long-range disorder for high intrinsic OER activity.
  • To overcome the limitations of crystalline hydroxide catalysts.

Main Methods:

  • Fabrication of amorphous multi-component hydroxide using a rapid freezing point precipitation method.
  • Characterization of the disordered glassy structure using X-ray/electron diffraction, enthalpic response, and pair distribution function analysis.
  • Electrocatalytic performance testing for OER, including overpotential and Tafel slope measurements.
  • Operando Raman spectroscopy and density functional theory (DFT) studies.

Main Results:

  • A highly-disordered glassy NiFeCoMnCr hydroxide was successfully synthesized.
  • The glassy hydroxide catalyst demonstrated a low OER overpotential (269 mV at 20 mA cm⁻²) and a small Tafel slope (33.3 mV dec⁻¹).
  • Performance surpassed the benchmark RuO₂ catalyst (341 mV, 84.9 mV dec⁻¹).

Conclusions:

  • The glassy-state hydroxide material exhibits superior intrinsic electrocatalytic activity for OER.
  • The disordered structure facilitates the conversion to an active oxyhydroxide phase with optimized oxygen intermediate adsorption.
  • This approach offers a new pathway for designing high-performance OER catalysts.