Bifunctional Monolayer WSe2/Graphene Self-Stitching Heterojunction Microreactors for Efficient Overall Water Splitting in Neutral Medium
Journal
ACS Nano
Journal Volume
16
Journal Issue
11
Pages
18274
Date Issued
2022-11-22
Author(s)
Chiang, Chun Hao
Yang, Yueh Chiang
Lin, Jia Wei
Lin, Yung Chang
Chen, Po Tuan
Dong, Chung Li
Lin, Hung Min
Chan, Kwun Man
Kao, Yu Ting
Suenaga, Kazu
Chiu, Po Wen
Abstract
Developing efficient bifunctional electrocatalysts in neutral media to avoid the deterioration of electrodes or catalysts under harsh environments has become the ultimate goal in electrochemical water splitting. This work demonstrates the fabrication of an on-chip bifunctional two-dimensional (2D) monolayer (ML) WSe2/graphene heterojunction microreactor for efficient overall water splitting in a neutral medium (pH = 7). Through the synergistic atomic growth of the metallic Cr dopant and graphene stitching contact on the 2D ML WSe2, the bifunctional WSe2/graphene heterojunction microreactor consisting of a full-cell configuration demonstrates excellent performance for overall water splitting in a neutral medium. Atomic doping of metallic Cr atoms onto the 2D ML WSe2effectively facilitates the charge transfer at the solid-liquid interface. In addition, the direct growth of the self-stitching graphene contact with the 2D WSe2catalyst largely reduces the contact resistance of the microreactor and further improves the overall water splitting efficiency. A significant reduction of the overpotential of nearly 1000 mV at 10 mA cm-2at the Cr-doped WSe2/graphene heterojunction microreactor compared to the ML pristine WSe2counterpart is achieved. The bifunctional WSe2/graphene self-stitching heterojunction microreactor is an ideal platform to investigate the fundamental mechanism of emerging bifunctional 2D catalysts for overall water splitting in a neutral medium.
Subjects
atomic engineering | bifunctional catalysts | bipolar transport | microreactors | neutral water splitting
Publisher
AMER CHEMICAL SOC
Type
journal article