Efficient NiFe-based oxygen evolution electrocatalysts and origin of their distinct activity

Han, Qun; Luo, Yuhong; Li, Jingde; Du, Xiaohang; Sun, Song; Wang, Yanji; Liu, Guihua; Chen, Zhongwei

doi:10.1016/j.apcatb.2021.120937

Cited by 93 publications

(56 citation statements)

References 48 publications

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“…Therefore, it is necessary to discuss the surface-active phase of electrocatalysts. As shown in Figure a–d, after OER with or without an AC magnetic field, the same phase appeared, while a slight peak shift was found in Co 2p 3/2 of all electrocatalysts, indicating the formation of a limited oxyhydroxide layer on the electrocatalyst surface. − Moreover, TEM images of the electrocatalyst Co after OER (Figure e–g) supported the conclusion.…”

Section: Resultssupporting

confidence: 63%

Enhanced Alkaline Oxygen Evolution Using Spin Polarization and Magnetic Heating Effects under an AC Magnetic Field

Zheng

Wang

Xie

et al. 2022

ACS Appl. Mater. Interfaces

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Renewable electricity from splitting water to produce hydrogen is a favorable technology to achieve carbon neutrality, but slow anodic oxygen evolution reaction (OER) kinetics limits its large-scale commercialization. Electron spin polarization and increasing the reaction temperature are considered as potential ways to promote alkaline OER. Here, it is reported that in the alkaline OER process under an AC magnetic field, a ferromagnetic ordered electrocatalyst can simultaneously act as a heater and a spin polarizer to achieve significant OER enhancement at a low current density. Moreover, its effect obviously precedes antiferromagnetic, ferrimagnetic, and diamagnetic electrocatalysts. In particular, the noncorrected overpotential of the ferromagnetic electrocatalyst Co at 10 mA cm −2 is reduced by a maximum of 36.6% to 243 mV at 4.320 mT. It is found that the magnetic heating effect is immediate, and more importantly, it is localized and hardly affects the temperature of the entire electrolytic cell. In addition, the spin pinning effect established on the ferromagnetic/paramagnetic interface generated during the reconstruction of the ferromagnetic electrocatalyst expands the ferromagnetic order of the paramagnetic layer. Also, the introduction of an external magnetic field further increases the orderly arrangement of spins, thereby promoting OER. This work provides a reference for the design of high-performance OER electrocatalysts under a magnetic field.

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Section: Resultssupporting

confidence: 63%

Enhanced Alkaline Oxygen Evolution Using Spin Polarization and Magnetic Heating Effects under an AC Magnetic Field

Zheng

Wang

Xie

et al. 2022

ACS Appl. Mater. Interfaces

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“…First, multi-component electrocatalysts comprising more than one metal (e.g., Fe, Co, and Ni) and/or non-metal (e.g., S and P) species have been demonstrated to show better performance than monometallic phosphide and sulfide, [13b] because the coexistence of multiple elements allows for the exposure of more catalytically active sites, and more importantly the tuning of catalyst's electronic structure that enables to enhance the intrinsic catalytic activity. [14] To this end, bimetallic phosphide/sulfide (Ni x Fe 1-x P/S, [15] (Co 1-x Fe x ) 2 P, [16] NiCoP, [17] and Fe-NiS 2 [18] ), metal phosphosulfide (CoPS, [19] P-NiS 2 , [20] CoS|P/CNT, [21] and FePS 3 [22] ), and multi-metal phosphosulfide (Fe 0.2 Ni 0.8 -P 0.5 S 0.5 , [23] Ni 1-x Fe x PS, [24] P-CoNi 2 S 4 , [12a] and FeCoNiP x S y [25] ), were reported already and exhibited improved electrocatalytic performance thanks to the synergetic interplay of different elements. Second, structure engineering turns out to be an effective strategy for achieving high catalytic performance.…”

Section: Research Articlementioning

confidence: 99%

Highly Efficient and Stable Saline Water Electrolysis Enabled by Self‐Supported Nickel‐Iron Phosphosulfide Nanotubes With Heterointerfaces and Under‐Coordinated Metal Active Sites

Martin‐Diaconescu

et al. 2022

Adv Funct Materials

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Direct seawater electrolysis is proposed as a potential low-cost approach to green hydrogen production, taking advantage of the vastly available seawater and large-scale offshore renewable energy being deployed. However, developing efficient, earth-abundant electrocatalysts that can survive under harsh corrosive conditions for a long time is still a significant technical challenge. Herein, the fabrication of a self-supported nickel-iron phosphosulfide (NiFeSP) nanotube array electrode through a two-step sulfurization/phosphorization approach is reported. The as-obtained NiFeSP nanotubes comprise abundant NiFeS/NiFeP heterointerfaces and under-coordinated metal sites, exhibiting outstanding activity and durability for the hydrogen and oxygen evolution reactions (HER and OER) in simulated alkaline-seawater solution (KOH + NaCl), with an overpotential of 380 (HER) and 260 mV (OER) at 500 mA cm -2 and outstanding durability of 1000 h. Theoretical calculations support the observed outstanding performance, showing that the heterointerface and under-coordinated metal sites synergistically lower the energy barrier of the rate-determining step reactions. The NiFeSP electrode also shows good catalytic performance for the urea oxidation reaction (UOR). By coupling UOR with HER, the bifunctional NiFeSP electrode pair can efficiently catalyze the overall urea-mediated alkaline-saline water electrolysis at 500 mA cm -2 under 1.938 V for 1000 h without notable performance degradation.

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“…The alkaline OER process consists of several basic steps about the first adsorption of OH − (OH*), then the formation of O*, OOH*, and O–O* intermediates, and the final desorption of O 2 . 13 We determined the adsorption strength of *OH intermediate by adding 1.0 M CH 3 OH into the electrolyte under the CV methods. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A NiFe-based monolithic electrocatalyst for pleiotropic-efficiency water oxidation

Wang

et al. 2022

J. Mater. Chem. A

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Efficient NiFe-based oxygen evolution electrocatalysts and origin of their distinct activity

Cited by 93 publications

References 48 publications

Enhanced Alkaline Oxygen Evolution Using Spin Polarization and Magnetic Heating Effects under an AC Magnetic Field

Enhanced Alkaline Oxygen Evolution Using Spin Polarization and Magnetic Heating Effects under an AC Magnetic Field

Highly Efficient and Stable Saline Water Electrolysis Enabled by Self‐Supported Nickel‐Iron Phosphosulfide Nanotubes With Heterointerfaces and Under‐Coordinated Metal Active Sites

A NiFe-based monolithic electrocatalyst for pleiotropic-efficiency water oxidation

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