Constructing accelerated charge transfer channels along V-Co-Fe via introduction of V into CoFe-layered double hydroxides for overall water splitting

Lv, Junjun; Li, Panpan; Li, Rushuo; Wang, Linmeng; Zhang, Kaiyue; Zhou, Peiyun; Huang, Xiubing; Wang, Ge

doi:10.1016/j.apcatb.2021.120587

Cited by 69 publications

(42 citation statements)

References 49 publications

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“…However, the valence of Fe 3+ ions in the crystalline area should be lower than +3 while that in the amorphous area ought to be higher than +3. Valence electron configuration of Fe 3+ in Fe-doped Ni/Co-based hydroxides is t 2g 3 e g 2 (3d 5 ) with five highly spin unpaired electrons on t 2g and e g d-orbitals, which complies with the half-filled low-energy configuration in the Hund rule . As such, in order to minimize the system energy, Fe 3+ ions in the crystalline area tend to act as an electron donor, while those in the amorphous area prefer to accept the transferred electrons.…”

Section: Resultsmentioning

confidence: 99%

“…Valence electron configuration of Fe 3+ in Fe-doped Ni/Co-based hydroxides is t 2g 3 e g 2 (3d 5 ) with five highly spin unpaired electrons on t 2g and e g d-orbitals, which complies with the half-filled low-energy configuration in the Hund rule. 66 As such, in order to minimize the system energy, Fe 3+ ions in the crystalline area tend to act as an electron donor, while those in the amorphous area prefer to accept the transferred electrons. It can be found from Figure 6a that Co species in Co 3 O 4 @NF has obtained electrons.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Wang

et al. 2021

ACS Catal.

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The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property of the oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel foam (NF)-supported electrocatalyst composed of a one-dimensional Co3O4 nanowire as the core and a two-dimensional NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co(OH)F of Co3O4, which results in improved thermal stability and significantly increased regularly distributed oxygen vacancies, while the electrochemically deposited NiFe-LDH nanosheets possess a crystalline/amorphous hybrid structure. As a result, the hetero-interface mainly constituting Ni species from NiFe-LDH and Co3O4 from Co(OH)F contributes to the interaction between Co and Fe species and facilitates the electron transfer. Simultaneously, the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area in NiFe-LDH is also determined, finally completing the electron backtracking. Benefiting from these factors, only low overpotentials of 221 and 257 mV are required to deliver the current densities of 100 and 500 mA cm–2, respectively, with a quite small Tafel slope of 34.6 mV dec–1 during OER for the well-designed NiFe-60/Co3O4@NF electrocatalyst.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Wang

et al. 2021

ACS Catal.

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185

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“…Catalytic reactions involving triplet-state O 2 molecules have been one of the hottest research topics nowadays. − Aqueous-phase oxygen evolution reaction (OER) is a significant component of the oxygen-involved catalytic reactions. , However, it is hampered by its sluggish kinetics owing to the complex four-electron process, which is typically recognized as the bottleneck for water splitting. − In principle, the formation of the O–O bond requires the destruction of two O–H bonds, involving the spin-electron evolution of the diamagnetic hydroxides to be oxidized into the paramagnetic oxygen molecules. − As a result, the regulation of the spin-state behavior of catalysts would play a considerable role in the OER process. − Although the spin-related OER enhancement has already been observed, it has rarely been systematically and comprehensively demonstrated. Therefore, spintronic electrocatalysis is still a relatively blank field of catalysis.…”

Section: Introductionmentioning

confidence: 99%

Regulating the Spin State of Fe^III Enhances the Magnetic Effect of the Molecular Catalysis Mechanism

et al. 2022

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Aqueous-phase oxygen evolution reaction (OER) is the bottleneck of water splitting. The formation of the O−O bond involves the generation of paramagnetic oxygen molecules from the diamagnetic hydroxides. The spin configurations might play an important role in aqueous-phase molecular electrocatalysis. However, spintronic electrocatalysis is almost an uncultivated land for the exploration of the oxygen molecular catalysis process. Herein, we present a novel magnetic Fe III site spin-splitting strategy, wherein the electronic structure and spin states of the Fe III sites are effectively induced and optimized by the Jahn−Teller effect of Cu 2+ . The theoretical calculations and operando attenuated total reflectance-infrared Fourier transform infrared (ATR FT-IR) reveal the facilitation for the O−O bond formation, which accelerates the production of O 2 from OH − and improves the OER activity. The Cu 1 −Ni 6 Fe 2 −LDH catalyst exhibits a low overpotential of 210 mV at 10 mA cm −2 and a low Tafel slope (33.7 mV dec −1 ), better than those of the initial Cu 0 −Ni 6 Fe 2 −LDHs (278 mV, 101.6 mV dec −1 ). With the Cu 2+ regulation, we have realized the transformation of NiFe−LDHs from ferrimagnets to ferromagnets and showcase that the OER performance of Cu−NiFe−LDHs significantly increases compared with that of NiFe−LDHs under the effect of a magnetic field for the first time. The magnetic-fieldassisted Cu 1 −Ni 6 Fe 2 −LDHs provide an ultralow overpotential of 180 mV at 10 mA cm −2 , which is currently one of the best OER performances. The combination of the magnetic field and spin configuration provides new principles for the development of highperformance catalysts and understandings of the catalytic mechanism from the spintronic level.

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“…Lv et al demonstrated cobalt-iron-vanadium tri-metallic LDHs (CoFeV-LDHs), revealing the bifunctional catalytic performance for both the OER and HER. 136 FeV@CC and the partial area magnified SEM image. (f) The value of R ct of Co 8 FeV@CC, Co 4 V@CC, Co 4 Fe@CC and RuO 2 @CC.…”

Section: Transition Metal-based Layered Double Hydroxide (Ldh) Electr...mentioning

confidence: 99%

“…Lv et al demonstrated cobalt–iron–vanadium tri-metallic LDHs (CoFeV-LDHs), revealing the bifunctional catalytic performance for both the OER and HER. 136 Fig. 7(d) shows the schematic diagram of the in situ synthesis of CoFeV-LDH nanosheets on a carbon cloth substrate through a one-step hydrothermal method.…”

Section: Transition Metal-based Layered Double Hydroxide (Ldh) Electr...mentioning

confidence: 99%

High performance transition metal-based electrocatalysts for green hydrogen production

et al. 2022

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Constructing accelerated charge transfer channels along V-Co-Fe via introduction of V into CoFe-layered double hydroxides for overall water splitting

Cited by 69 publications

References 49 publications

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Regulating the Spin State of Fe^III Enhances the Magnetic Effect of the Molecular Catalysis Mechanism

High performance transition metal-based electrocatalysts for green hydrogen production

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Constructing accelerated charge transfer channels along V-Co-Fe via introduction of V into CoFe-layered double hydroxides for overall water splitting

Cited by 69 publications

References 49 publications

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co3O4 and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co3O4 and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Regulating the Spin State of FeIII Enhances the Magnetic Effect of the Molecular Catalysis Mechanism

High performance transition metal-based electrocatalysts for green hydrogen production

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Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Constructing a Hetero-interface Composed of Oxygen Vacancy-Enriched Co₃O₄ and Crystalline–Amorphous NiFe-LDH for Oxygen Evolution Reaction

Regulating the Spin State of Fe^III Enhances the Magnetic Effect of the Molecular Catalysis Mechanism