Surface engineered CoP/Co3O4heterojunction for high-performance bi-functional water splitting electro-catalysis
Journal
Nanoscale
Journal Volume
13
Journal Issue
47
Pages
20281-20288
Date Issued
2021
Author(s)
Abstract
In the electrochemical water splitting process, integrating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte with the same catalyst is highly beneficial for increasing the energy efficiency and reducing the fabrication cost. However, most OER catalysts are unstable in the acidic solution, while HER shows poor kinetics in the alkaline solution, which hinders the scale-up application of electro-catalytic water splitting. In this work, a CoP/Co3O4 heterostructure is firstly fabricated and then O and P defects are introduced via surface engineering (s-CoP/Co3O4). The as-prepared material was employed as the catalyst towards electrochemical water splitting in an alkaline environment. In alkaline HER, a current density of -10 mA cm-2 can be achieved at an overpotential of 106 mV vs. RHE. In the OER process, the overpotential of s-CoP/Co3O4 electrode is only 211 mV vs. RHE at 10 mA cm-2 in 1 M KOH, and the corresponding Tafel slope is only 58.4 mV dec-1 so that the s-CoP/Co3O4 electrode could be used as the bifunctional catalyst for alkaline water splitting. This work provides a simple and low-cost approach to fabricate a Co-based heterojunction electrode with unsaturated metal sites to improve the electro-catalytic activities towards water splitting. ? The Royal Society of Chemistry.
Subjects
Catalyst activity
Electrodes
Energy efficiency
Heterojunctions
Potassium hydroxide
Surface defects
Bi-functional
Electro catalysis
Electrochemicals
Functional water
Hydrogen evolution reactions
Overpotential
Performance
Splitting process
Water splitting
]+ catalyst
Electrolytes
SDGs
Type
journal article