Abstract
Highly active, long-lasting, and low-cost nanostructured catalysts with efficient oxygen evolution and oxygen reduction reactions (OER and ORR) are critical for achieving high-performance zinc-air batteries. Herein, we developed CoP-nitrogen-doped carbon@NiFeP nanoflakes (CoP-NC@NFP), derived from MOF enriched with multiple active sites, for multifunctional water splitting and zinc-air battery applications. The experimental results revealed that the multiple active catalytic sites of CoP-NC@NFP were responsible for the excellent charge-transfer kinetics and electrocatalytic performance with respect to water splitting. This performance is comparable to that of precious metal catalysts in alkaline electrolytes (OER: overpotential of 270 mV; HER: overpotential of 162 mV; ORR: Tafel slope of 46 mV dec−1; overall water splitting device: cell voltage of 1.57 V at 10 mA cm−2) with excellent electrochemical durability. Additionally, the structural stability of the OER and the HER durability of the CoP-NC@NFP electrocatalyst were confirmed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) studies. Most impressively, zinc-air batteries (ZABs) assembled with CoP-NC@NFP as the air–cathode exhibit exceptionally high power density of 93 mW cm−2 and prolonged operational stability over 200 h compared with a ZAB equipped with a benchmark air–cathode. The outcome of this study opens a practical possibility for the preparation of efficient multifunctional catalysts free of noble metals for clean energy production and storage.
Original language | English |
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Article number | 131115 |
Journal | Chemical Engineering Journal |
Volume | 428 |
DOIs | |
Publication status | Published - 2022 Jan 15 |
Bibliographical note
Funding Information:This research was supported by the BK21 FOUR Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 4199990514635 ). This work was supported by the Materials and Components Technology Development Program of KEIT (Project No. 10053590 ).
Publisher Copyright:
© 2021 Elsevier B.V.
Keywords
- Metal organic framework
- Oxygen reduction reaction
- Transition metal phosphide
- Water splitting
- Zinc–air batteries
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering