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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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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).
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Recent progress in transition metal phosphides with enhanced electrocatalysis for hydrogen evolution.

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Transition metal phosphides (TMPs) are effective catalysts for hydrogen evolution reaction (HER). This review highlights strategies for enhancing TMP catalyst performance through composition and structure engineering for efficient hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Growing demand for hydrogen energy necessitates efficient and cost-effective catalysts.
  • Transition metal phosphides (TMPs) show significant promise as electrocatalysts for the hydrogen evolution reaction (HER).
  • Current research focuses on improving the electrocatalytic performance of TMP-based materials.

Purpose of the Study:

  • To summarize recent advancements in designing TMP-based catalysts for enhanced HER.
  • To provide a guideline for improving HER activity through material engineering.
  • To offer perspectives applicable to designing other high-performance catalysts.

Main Methods:

  • Review of recent literature on transition metal phosphides for HER.
  • Analysis of composition and structure engineering strategies.
  • Focus on electrocatalytic performance enhancement.

Main Results:

  • Compositional modifications and structural engineering significantly enhance HER activity in TMPs.
  • Specific strategies offer a pathway to optimize catalyst design.
  • The findings are relevant for developing advanced catalytic materials.

Conclusions:

  • Engineering the composition and structure of TMPs is key to boosting their HER performance.
  • A clear guideline for enhancing HER activity in TMPs is presented.
  • These insights can guide the development of other cost-effective, high-performance catalysts.