Journal
CHEMICAL ENGINEERING JOURNAL
Volume 416, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129098
Keywords
Heterostructure; Electronic structure; Nanosheet; Anion defect; Fe < sub > 2 <; sub > O < sub > 3 <; sub > modification
Categories
Funding
- National Natural Science Foundation of China [NSFC 21666023]
- Natural Science Foundation of Inner Mongolia Autonomous Region of China [2017JQ01]
- Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region [NJYT-19-A01]
- 111 Project [D20033]
Ask authors/readers for more resources
In this study, Fe2O3/NiSe2 and Fe2O3/Ni3S2 heterostructures with abundant anion defects were successfully constructed, showing outstanding electrocatalytic activities by reducing the energy barrier of intermediates. The integration of interface engineering and anion defects significantly improved the catalytic performances of the Fe2O3-modified NiSe2 and Ni3S2 catalysts.
Interfacial electronic structure regulation has been shown to be beneficial for a variety of electrocatalytic reactions. However, integrating foreign species into anion vacancy defect electrocatalysts, and investigating their interfacial electron structure and synergistic catalytic effect are still somewhat controversial. Herein, Fe2O3/ NiSe2 and Fe2O3/Ni3S2 heterostructures catalysts with abundant anion defects (Se, S) were constructed through an efficient spatial combination of primary hydroxide nanosheets. The Fe2O3/NiSe2 and Fe2O3/Ni3S2 catalysts exhibited outstanding electrocatalytic activities, as shown by the overpotentials of 200 mV at 100 mA cm-2 for OER, and 60 mV at 10 mA cm-2 for HER, respectively. The Fe2O3/NiSe2 (anode)?Fe2O3/Ni3S2 (cathode) device accelerated water splitting at 1.54 V with 10 mA cm-2, surpassing the integrated couple of Pt and Ir-based oxide (1.57 V). The chemical valence state, combined with DFT calculations, revealed that interface engineering and anion defects could modulate the electronic structures of the Fe2O3 modified NiSe2 and Ni3S2 catalysts, reduce the energy barrier of intermediate, and therefore dramatically improve their catalytic performances. This work not only presents a universal strategy for the construction of active and durable electrocatalyst with abundant anion defects, but also provides a new way for the rational design of novel nanostructure for electrocatalytic applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available