Journal
CHEMICAL ENGINEERING JOURNAL
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131115
Keywords
Metal organic framework; Transition metal phosphide; Water splitting; Oxygen reduction reaction; Zinc-air batteries
Categories
Funding
- BK21 FOUR Program through the National Research Foundation of Korea (NRF) - Ministry of Education [4199990514635]
- Materials and Components Technology Development Program of KEIT [10053590]
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The CoP-NC@NFP catalyst, derived from MOF with multiple active sites, exhibits excellent charge-transfer kinetics and electrocatalytic performance in water splitting, comparable to precious metal catalysts in alkaline electrolytes, with outstanding electrochemical durability. Furthermore, zinc-air batteries assembled with CoP-NC@NFP as the air-cathode demonstrate high power density and prolonged operational stability, suggesting potential for efficient multifunctional catalysts free of noble metals for clean energy production and storage.
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 chargetransfer 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.
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