Journal
NANO-MICRO LETTERS
Volume 11, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0299-4
Keywords
Core-shell structure; Bimetallic selenide; N-doped carbon; Synergistic effect; Oxygen evolution reaction
Funding
- NSFC [51702284, 21878270]
- Zhejiang Provincial Natural Science Foundation of China [LR19B060002]
- Startup Foundation for Hundred-Talent Program of Zhejiang University [112100-193820101/001/022]
Ask authors/readers for more resources
Demand of highly efficient earth-abundant transition metal-based electrocatalysts to replace noble metal materials for boosting oxygen evolution reaction (OER) is rapidly growing. Herein, an electrochemically exfoliated graphite (EG) foil supported bimetallic selenide encased in N-doped carbon (EG/(Co, Ni)Se-2-NC) hybrid is developed and synthesized by a vapor-phase hydrothermal strategy and subsequent selenization process. The as-prepared EG/(Co, Ni)Se-2-NC hybrid exhibits a core-shell structure where the particle diameter of (Co, Ni)Se-2 core is about 70 nm and the thickness of N-doped carbon shell is approximately 5 nm. Benefitting from the synergistic effects between the combination of highly active Co species and improved electron transfer from Ni species, and N-doped carbon, the EG/(Co, Ni)Se-2-NC hybrid shows remarkable electrocatalytic activity toward OER with a comparatively low overpotential of 258 mV at an current density of 10 mA cm(-2) and a small Tafel slope of 73.3 mV dec(-1). The excellent OER catalysis performance of EG/(Co, Ni)Se-2-NC hybrid is much better than that of commercial Ir/C (343 mV at 10 mA cm(-2) and 98.1 mV dec(-1)), and even almost the best among all previously reported binary CoNi selenide-based OER electrocatalysts. Furthermore, in situ electrochemical Raman spectroscopy combined with ex situ X-ray photoelectron spectroscopy analysis indicates that the superb OER catalysis activity can be attributed to the highly active Co-OOH species and modified electron transfer process from Ni element.
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