Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 316, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121678
Keywords
Nanoscale electrocatalyst; Metal phosphide; Heterogeneous interface; Cerium oxide; Overall water splitting
Funding
- National Natural Science Foundation of China [52177162, 22061002, 52067002, 51862001, 51877184]
- Zhejiang Natural Science Foundations of China [LZ22E070003, LQ22E020006]
- Jiangxi Provincial Natural Science Foundation [20212ACB211001]
- Australian Research Council (ARC)
- QUT Centre for Materials Science
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In this study, a hybrid nanowire-nanosheet structure made of cerium oxide and nickel-cobalt phosphide (CeO2-NiCoPx) compound was in situ engineered on Ni-Co foam (CeO2-NiCoPx/NCF) for efficient and robust water splitting. The synthesized CeO2-NiCoPx/NCF catalyst exhibited excellent catalytic activity and durability for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
Herein, a hybrid nanowire-nanosheet structure made of the cerium oxide and nickel-cobalt phosphide (CeO2-NiCoPx) compound is in situ engineered on the Ni-Co foam (CeO2-NiCoPx/NCF) for the robust water splitting (HER and OER), and the overpotentials of synthesized CeO2-NiCoPx/NCF are about 39 mV for HER and 260 mV for OER at a current density of 10 mA cm(-2) (j(10)). Meanwhile, the nanostructure of CeO2-NiCoPx is well preserved after a long-term electrocatalytic process (100 h) at a large current density of 100 mA cm(-2) (j(100)). When the CeO2-NiCoPx/NCF simultaneously acts as the HER and OER electrodes, the potential of 1.49 V is obtained for transferring j(10) with an excellent durability. Theoretical simulations and in operando Raman spectroscopy reveal that the Co and Ni atoms for CeO2-NiCoPx/NCF catalyst are likely to act as the pivotal reaction centers for HER and OER processes, respectively.
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