Journal
NANOSCALE
Volume 12, Issue 17, Pages 9866-9872Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr00879f
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Funding
- Sichuan Science and Technology Program [2018GZ0434]
- National Natural Science Foundation of China [21773024, 51372033]
- National High Technology Research and Development Program of China [2015AA034202]
- Sichuan Science and Technology Foundation [20YYJC3895]
- Fundamental Research Funds for the Central Universities, China [YJ201893]
- State Key Lab of Advanced Metals and Materials, China [2019-Z03]
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It is still challenging to develop non-precious free-standing bifunctional electrocatalysts with high efficiency for hydrogen and oxygen evolution reactions. Herein, for the first time, we present a novel hybrid electrocatalyst synthesized via a facile hydrothermal reaction, which is constructed from ultrafine NiSe2 nanoparticles/nanosheets homogeneously anchored on 3D graphene/nickel foam (NiSe2/3DSNG/NF). This hybrid delivers superior catalytic performances for hydrogen/oxygen evolution reactions and overall water splitting: it shows an ultra-small Tafel slope of 28.56 mV dec(-1) for hydrogen evolution in acid, and a small Tafel slope of 42.77 mV dec(-1) for the oxygen evolution reaction; particularly, in a two-electrode setup for water splitting, it requires an ultra-small potential of 1.59 V to obtain 10 mA cm(-2) with nearly 100% faradaic efficiencies for H-2 and O-2. This study presents a new approach of catalyst design and fabrication to achieve highly efficient and low-cost water electrolysis.
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