FeCo nanoparticles with different compositions as electrocatalysts for oxygen evolution reaction in alkaline solution

Park, Jong-Hwan; Ro, Jae Chul; Suh, Su‐Jeong

doi:10.1016/j.apsusc.2022.153041

Cited by 16 publications

(4 citation statements)

References 73 publications

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“…In addition, the NiMo 16 kW@100 mm sample exhibited a good performance at high current densities (Fig. S10(b), ESI †) as well as a competitive mass activity of 0.3 A g À1 at an overpotential of 300 mV, in agreement with other noble-metal-free electrocatalysts, [55][56][57] see also Table S5 (ESI †) for further comparison. The stability test was initially conducted by applying a constant potential large enough to achieve a current density of 10 mA cm À2 for 24 h, and the chronoamperometric (CA) response is plotted in Fig.…”

Section: Oxygen Evolutionsupporting

confidence: 72%

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

García

Rafei

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Oxygen Evolutionsupporting

confidence: 72%

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

García

Rafei

et al. 2023

Phys. Chem. Chem. Phys.

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“…The position of the absorption edge of Co/N-HPCs-800 is located between CoO and Co 3 O 4 , indicating that the Co in Co/N-HPCs-800 is positively charged and the valence state of Co is between Co 2+ and Co 8/3+ , mainly due to N doping. Meanwhile, the frontier peak value of 7709.6 eV is caused by the transition of 1s-4p z , indexing the fingerprint of the Co-X 4 coordination (here X = N). , Figure b obtained from the Fourier transform of the k-space (Figure S7) of EXAFS shows that Co/N-HPCs-800 has a peak at 1.44 Å (no phase correction), close to the Co-N peak of CoPc. In addition, the Wavelet transform (WT) of the Co K-edge EXAFS spectrum also demonstrates this strongly.…”

Section: Resultsmentioning

confidence: 99%

Biomass-based Hierarchical Porous ORR and OER Bifunctional Catalysts with Strong Stability for Zn-Air Batteries

Nie

Dong

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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Although the Zn-air battery has many advantages, its short practical life hinders its development. Many solutions have been proposed and extensively studied. In this paper, a cobalt-nitrogen co-doped hierarchical porous carbon-based bifunctional catalyst (Co/N-HPCs-800) is reported, using sustainable and low-cost sodium alginate (Na-Alg), a common seaweed extract, as a precursor to complex excess metal particles. The hydrogel network formed by the exchange of sodium ions with metal cation (Co 2+ ) ions is the key to the controllable synthesis of highly dispersed metal atoms. Co/N-HPCs-800 shows excellent catalytic performance and durability in oxygen reduction reaction (E 1/2 = 0.86 V) and oxygen evolution reaction (367 mV @ 10 mA cm −2 ). Importantly, we only attenuated the half-wave potential by 8 mV after more than 50,000 cycles. In addition, the Zn-air batteries (ZABs) using Co/N-HPCs-800 as a cathode exhibit a power density up to 159.67 mW cm −2 and a high specific capacity of 787.94 mA h g −1 . This work opens up practical new strategies for synthesizing excess metal catalysts in low cost, effectively improving the service life of Zn-air batteries.

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“…FeCo NPs mostly used for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) activities. In a recent work by Park et al [10] revealed that the overpotential for Fe59Co41 was significantly lower, measuring 285 mV at 10 mA cm -2 in a 1 M KOH solution, compared to the other samples. Furthermore, following chronopotentiometry at 10 mA cm -2 for 24 hours in 1 M KOH, the overpotential at 10 mA cm -2 increased slightly from 285 to 294 mV.…”

Section: Introductionmentioning

confidence: 93%

Structural, Magnetic and Catalytic Properties of FeCo Nanoparticles Synthesized by Polyol Process

TAYFUN,

ERMAN,

KAYA

et al. 2023

ADYU J SCI

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Multi-functional FeCo nanoparticles (NPs) exhibit unique structural, magnetic and catalytic properties, making them versatile materials with potential applications in diverse fields. In this work, we investigated the structural, electrochemical and magnetic properties of as-prepared FeCo NPs synthesis by polyol method. X-ray diffraction analysis revealed multiphase structures: FeCo and α-Fe2O3 phases and scanning electron microscopy images confirmed spherical-like structures of FeCo NPs with an average size of 12.4 ± 0.1 nm. The electrochemical properties of FeCo NPs were investigated using a three-electrode setup in a 1 M KOH electrolyte at room temperature. The onset potentials for FeCo catalysts were found to be -0.15 V for ORR, 0.25 V for OER, and -1.26 V for HER. Tafel measurements further elucidated the reaction mechanism, revealing corrosion potentials of -0.165 V for ORR and 0.215 V for OER, with Tafel slopes of 228 mV dec-1 and 48 mV dec-1, respectively. A significant increase in magnetization was observed below 25 K in both zero-field-cooled and field-cooled curves, with a magnetic transition occurring at Ts=15 K, possibly indicating a ferromagnetic-to-antiferromagnetic phase transition. The hysteresis loop measurements revealed coercive field values ranging from 968 Oe at 5 K to approximately 206 Oe at 320 K, indicating a relaxation in magnetic spin orientation with increasing temperature. The saturation magnetization (Ms) values were recorded as 15.2 emu/g under a 5 T magnetic field, and the remanent magnetization (Mr) showed dominant ferromagnetic properties at 5 K with an Mr/Ms ratio indicating soft magnetic behavior. The magnetic susceptibility of FeCo NP exhibited a peak at approximately 25 K, and the Curie-Weiss law provided an estimated θ angle of -9.58°, suggesting antiferromagnetic interactions.

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FeCo nanoparticles with different compositions as electrocatalysts for oxygen evolution reaction in alkaline solution

Cited by 16 publications

References 73 publications

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

Biomass-based Hierarchical Porous ORR and OER Bifunctional Catalysts with Strong Stability for Zn-Air Batteries

Structural, Magnetic and Catalytic Properties of FeCo Nanoparticles Synthesized by Polyol Process

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