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Interface Modulation of Two-Dimensional Superlattices for Efficient Overall Water Splitting.

Pan Xiong¹, Xiuyun Zhang², Hao Wan³

¹Centre for Clean Energy Technology, School of Mathematical and Physical Sciences , University of Technology Sydney , Sydney , NSW 2007 , Australia.

|June 13, 2019

Summary

Superlattices made of molybdenum disulfide (MoS₂) and nickel-iron layered double hydroxide (NiFe-LDH) show superior performance for electrocatalytic water splitting. This interface engineering approach offers a promising pathway for developing advanced catalysts.

Keywords:

Interface modulation overall water splitting superlattices unilamellar nanosheets

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Interface engineering at the molecular scale is crucial for enhancing catalytic activity in nanomaterials.
Superlattices composed of different nanosheets offer tunable properties for various applications.

Purpose of the Study:

To investigate the electrocatalytic performance of superlattices formed from MoS₂, NiFe-LDH, and graphene for water splitting.
To identify the optimal superlattice structure for efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).

Main Methods:

Fabrication of three types of superlattices: MoS₂/NiFe-LDH, MoS₂/graphene, and NiFe-LDH/graphene.
Electrochemical characterization of superlattices for OER and HER in alkaline media.
Analysis of catalytic performance, including overpotentials and stability, compared to commercial catalysts.

Main Results:

The MoS₂/NiFe-LDH superlattice demonstrated significantly lower overpotentials for both OER (210 mV) and HER (110 mV) at 10 mA cm⁻².
This superlattice also exhibited high activity and stability for overall water splitting, surpassing the commercial Pt/C-RuO₂ catalyst.
Superior performance is attributed to strong electronic coupling at the heterointerfaces, optimizing adsorption energies for reaction intermediates.

Conclusions:

Interface modulation in MoS₂/NiFe-LDH superlattices is a highly effective strategy for designing advanced electrocatalysts.
This approach holds significant promise for developing efficient and stable catalysts for water splitting applications.
The findings pave the way for future research into rationally designed nanomaterial interfaces for catalysis.