Self-Supported Transition-Metal-Based Electrocatalysts for Hydrogen and Oxygen Evolution.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Conversion

Background:

• Electrochemical water splitting offers a sustainable route for hydrogen energy. Noble-metal catalysts are effective but costly for widespread water electrolysis. Earth-abundant alternatives are essential for scalable applications.
• Freestanding electrode architectures show promise over conventional coated electrodes due to improved kinetics and stability in water electrolysis.

Purpose of the Study:

• To review recent advancements in earth-abundant transition-metal-based electrocatalysts for hydrogen and oxygen evolution reactions (HER/OER).
• To focus on self-supported electrode designs, their synthesis, mechanistic understanding, and performance enhancement strategies for water electrolysis.

Main Methods:

• Literature review of transition-metal compounds including chalcogenides, phosphides, carbides, nitrides, alloys, phosphates, oxides, hydroxides, and oxyhydroxides.
• Analysis of recent progress in structural design, synthesis, and mechanistic studies of self-supported electrocatalysts for HER/OER.

Main Results:

• Various transition-metal compounds demonstrate high activity and durability for HER/OER.
• Self-supported electrode architectures offer enhanced performance compared to traditional catalyst coatings.
• Progress in controllable synthesis and mechanistic understanding is key to optimizing these materials.

Conclusions:

• Self-supported electrocatalysts based on earth-abundant transition metals are vital for efficient and scalable water electrolysis.
• Further research into structural design, synthesis, and mechanistic insights will drive the development of next-generation electrocatalysts.
• Addressing remaining challenges is crucial for the practical application of these sustainable energy technologies.