Modulation of Electrocatalytic Overall Water Splitting Performance by β,β'-Functionalization of Ni(II) Porphyrins

Area of Science:

• Inorganic Chemistry
• Materials Science
• Electrochemistry

Background:

• Nickel porphyrins are investigated as potential electrocatalysts.
• Modulating catalytic activity is crucial for efficient energy conversion.
• Understanding structure-activity relationships guides catalyst design.

Purpose of the Study:

• To develop a method for modulating nickel porphyrin catalytic activity.
• To synthesize and characterize nickel porphyrins with specific modifications.
• To evaluate their performance in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Main Methods:

• Synthesis of nickel porphyrins with fused butano (Ni2) and benzo (Ni3) rings via β,β'-modification.
• Electrocatalytic testing for HER and OER performance.
• Analysis of structure-activity relationships.

Main Results:

• Ni2 demonstrated excellent catalytic activity for HER.
• Ni3 exhibited superior performance for OER.
• β,β'-modification significantly impacts the reactivity of the nickel active site.

Conclusions:

• β,β'-modification is an effective strategy for tuning HER and OER catalytic activities of nickel porphyrins.
• Fine-tuning the electronic structure of porphyrins provides insights into modulating catalytic properties.
• This work offers a pathway for designing advanced electrocatalysts for energy applications.