Oxygen-Deficient Cobalt-Based Oxides for Electrocatalytic Water Splitting

Area of Science:

• Materials Science
• Electrochemistry
• Surface Chemistry

Background:

• Growing interest in anionic point defect engineering for electrocatalysis.
• Vacancy engineering widely reported to improve transition metal oxides (TMOs) activity.
• Oxygen vacancies in cobalt-based TMOs show promise for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).

Purpose of the Study:

• To explore facile and environmentally benign synthesis strategies for oxygen vacancy engineering in cobalt oxides.
• To provide detailed insights into the mechanistic modulation of electrocatalysts via oxygen vacancies.
• To guide the rational design of novel electrocatalysts for water splitting.

Main Methods:

• Review of contemporary efforts in inducing oxygen vacancies in cobalt oxides.
• Discussion of characterization techniques for vacancy-engineered materials.
• Analysis of intrinsic mechanistic modulation principles.

Main Results:

• Oxygen vacancy engineering tunes electronic structure and charge transport.
• Vacancy creation can generate secondary active surface phases.
• Surface adsorption/desorption behavior of intermediates is modified.

Conclusions:

• Oxygen vacancy engineering is a powerful strategy for enhancing electrocatalyst performance.
• Understanding these principles aids in designing superior electrocatalysts.
• Regulating surface chemistry of TMOs is crucial for selective seawater splitting.