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Bifunctional Monolayer WSe2/Graphene Self-Stitching Heterojunction Microreactors for Efficient Overall Water
Chun-Hao Chiang1, Yueh-Chiang Yang2, Jia-Wei Lin3
1Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
ACS Nano
|October 28, 2022
Summary
This study presents a novel on-chip microreactor using a chromium-doped tungsten diselenide (WSe2) and graphene heterojunction for efficient, neutral-pH water splitting. This bifunctional catalyst significantly reduces energy loss, advancing sustainable hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Developing stable, efficient bifunctional electrocatalysts for neutral-pH water splitting is crucial to avoid harsh conditions.
- Tungsten diselenide (WSe2) and graphene are promising 2D materials for catalysis.
Purpose of the Study:
- To fabricate an on-chip bifunctional two-dimensional (2D) monolayer (ML) WSe2/graphene heterojunction microreactor for efficient overall water splitting in a neutral medium (pH = 7).
- To investigate the synergistic effects of metallic chromium (Cr) doping and graphene stitching on WSe2 for enhanced catalytic performance.
Main Methods:
- Fabrication of a 2D ML WSe2/graphene heterojunction microreactor.
- Atomic doping of metallic Cr onto the WSe2 monolayer.
- Integration of graphene stitching contact for improved conductivity.
- Testing the microreactor's performance for overall water splitting in a neutral medium.
Main Results:
- The Cr-doped WSe2/graphene heterojunction microreactor demonstrated excellent bifunctional performance for overall water splitting.
- Atomic Cr doping facilitated charge transfer, while graphene stitching reduced contact resistance.
- A significant reduction in overpotential (nearly 1000 mV at 10 mA cm-2) was achieved compared to pristine WSe2.
- The device operated efficiently in a neutral medium (pH = 7).
Conclusions:
- The on-chip bifunctional WSe2/graphene heterojunction microreactor is a highly effective platform for neutral-pH water splitting.
- Synergistic Cr doping and graphene integration enhance catalytic activity and reduce energy loss.
- This work provides an ideal system for studying the fundamental mechanisms of 2D catalysts in water splitting.
