Efficient Overall Water-Splitting Electrocatalysis Using Lepidocrocite VOOH Hollow Nanospheres

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Electrocatalytic water splitting is crucial for sustainable hydrogen production.
• Developing efficient and cost-effective electrocatalysts is a key challenge.
• Vanadium-based materials show potential for electrocatalytic applications.

Purpose of the Study:

• To report the controlled synthesis of lepidocrocite VOOH hollow nanospheres.
• To investigate their application as electrocatalysts for water splitting.
• To optimize performance by tuning nanosphere surface area.

Main Methods:

• Controlled synthesis of lepidocrocite VOOH hollow nanospheres.
• Electrocatalytic testing for oxygen evolution reaction (OER).
• Electrocatalytic testing for hydrogen evolution reaction (HER).
• Evaluation of overall water splitting performance.

Main Results:

• Achieved optimal performance by tuning nanosphere surface area.
• Low overpotentials: 270 mV for OER and 164 mV for HER at 10 mA cm⁻² in 1 M KOH.
• Low cell voltage of 1.62 V for overall water splitting at 10 mA cm⁻².

Conclusions:

• Lepidocrocite VOOH hollow nanospheres are effective electrocatalysts for water splitting.
• The material offers an efficient alternative to conventional water splitting catalysts.
• Tuning surface area is critical for optimizing catalytic performance.