FeNi3/NiFeOx Nanohybrids as Highly Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Yan, Xiaodong; Tian, Lihong; Li, Kexue; Atkins, Samuel; Zhao, Haifeng; Murowchick, James B.; Liu, Lei; Chen, Xiaobo

doi:10.1002/admi.201600368

Cited by 95 publications

(75 citation statements)

References 59 publications

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“…As depicted in Figure S8 (Supporting Information), Ni(Cu)/NF electrode exhibits a much lower R ct value (5.0 Ω cm −2 ) than that of NiCu/NF (6.40 Ω cm −2 ), Ni/NF (9.75 Ω cm −2 ), and NF (64.81 Ω cm −2 ), indicating Ni(Cu)/NF electrode holds a smaller interfacial charge‐transfer resistance than the others. This is originated from the bimetallic state of the catalyst and efficient interfacial contact of the 3D porous materials with electrolyte, which cannot only greatly accelerate interfacial charge transfer, but also mass transfer …”

Section: Resultsmentioning

confidence: 99%

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Sun

Dong

Wang

et al. 2018

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125

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Developing highly active electrocatalysts with low cost and high efficiency for hydrogen evolution reactions (HERs) is of great significance for industrial water electrolysis. Herein, a 3D hierarchically structured nanotubular copper-doped nickel catalyst on nickel foam (NF) for HER is reported, denoted as Ni(Cu), via facile electrodeposition and selective electrochemical dealloying. The as-prepared Ni(Cu)/NF electrode holds superlarge electrochemical active surface area and exhibits Pt-like electrocatalytic activity for HER, displaying an overpotential of merely 27 mV to achieve a current density of 10 mA cm and an extremely small Tafel slope of 33.3 mV dec in 1 m KOH solution. The Ni(Cu)/NF electrode also shows excellent durability and robustness in both continuous and intermittent bulk water electrolysis. Density functional theory calculations suggest that Cu substitution and the formation of NiO on the surface leads to more optimal free energy for hydrogen adsorption. The lattice distortion of Ni caused by Cu substitution, the increased interfacial activity induced by surface oxidation of nanoporous Ni, and numerous active sites at Ni atom offered by the 3D hierarchical porous structure, all contribute to the dramatically enhanced catalytic performance. Benefiting from the facile, scalable preparation method, this highly efficient and robust Ni(Cu)/NF electrocatalyst holds great promise for industrial water-alkali electrolysis.

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Section: Resultsmentioning

confidence: 99%

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Sun

Dong

Wang

et al. 2018

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125

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“…(a) OER polarization curves of IrO 2 , NiFeO x , and FeNi 3 /NiFeO x series . (b) OER polarization curves of NiFeO@MnO x catalysts.…”

Section: Advancements Of Tm‐based Electrocatalystsmentioning

confidence: 99%

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ibrahim

Tsai

Chala

et al. 2019

J Chinese Chemical Soc

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Electrochemical energy storage and conversion devices play a key role in the development of clean, sustainable, and efficient energy systems to meet the sustainable growth of our society. However, challenging issues including the sluggish kinetics of oxygen electrode reactions involving the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are present, limiting the implementation of devices such as metal‐air batteries, water electrolyzers, and regenerative fuel cells. In this review, various monometallic and bimetallic transition metal oxides (TMOs) and hydroxides are summarized in terms of their application for ORR/OER, in which the merits and demerits of various precious metal and carbon‐based metal oxide materials are discussed, with requirements for better electrocatalysts and catalyst support being introduced as well. Following this, different approaches to improve catalytic activity such as the introduction of doping and defects, the manipulation of crystal facets, and the engineering of supports, compositions, and morphologies are summarized in which TMOs with improved ORR/OER catalytic activities can be synthesized, further improving the speed, stability, and polarization of electrochemical energy storage and conversion devices. Finally, perspectives into the improvement of performance and the better understanding of ORR/OER mechanisms for bifunctional electrocatalysts using in situ spectroscopic techniques and density functional theory calculations are also discussed.

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“…From the analysis of Fourier transforminfrared spectra (FT-IR), the peak below 1000 cm −1 shows the presence of metal-oxygen bond, while the peaks located at 1000-2000 cm −1 indicate a carbonyl peak feature (Figure 3b). [27,30] In Figure 3e, the deconvolution analysis of O 1s spectra reveals the peaks at 529.9, 531.5, and 532.6 eV are ascribed to metal-oxygen, oxygen vacancies, and adsorbed water in NC/V o -WON arrays, [28,31] presenting the surface structural regulation after hydrogenation/ nitridation-induced treatments. From Raman spectra (Figure 3c), the peak positions below 1000 cm −1 have been slightly shifted while two strong peaks located at 1362 and 1584 cm −1 were appeared in all NC/V o -WON arrays, [29] implying the formation of NC layer-encapsulated V o -WON heterostructure.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Active Sites in Mesoporous Defect‐Rich NC/V_o‐WON Heterostructure Array for Superior Electrocatalytic Hydrogen Evolution

Zhang

Hou

et al. 2019

Advanced Energy Materials

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Tailoring active sites in earth‐abundant non‐noble metal electrocatalysts are required toward widespread applications in sustainable energy fields. Herein, an integrated mesoporous heterostructure array is reported by a hydrogenation/nitridation‐induced in situ growth strategy. Highly conductive oxygen‐vacancies‐rich tungsten oxynitride (Vo‐WON) nanorod array acts as the backbone encapsulated by ultrathin nitrogen‐doped carbon (NC) nanolayers, forming high‐quality shell/core NC/Vo‐WON heterostructures. Density functional theory calculations reveal that defect‐rich heterostructure arrays not only enhance the conductivity and modulate electronic structure but also promote the adsorption and dissociation of reactants and offer substantial potential sites. As expected, porous NC/Vo‐WON array exhibits a small overpotential of 16 mV at the current density of 10 mA cm−2 and a low Tafel slope of 33 mV per decade in alkaline media, accompanied by negligible loss upon a large current density over 100 h. Benefiting from outstanding electrocatalytic hydrogen evolution reaction performance and stability, this defective heterostructure could serve as a prominent alternative electrocatalyst for renewable energy applications.

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FeNi₃/NiFeO_x Nanohybrids as Highly Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Cited by 95 publications

References 59 publications

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

A review of transition metal‐based bifunctional oxygen electrocatalysts

Tailoring Active Sites in Mesoporous Defect‐Rich NC/V_o‐WON Heterostructure Array for Superior Electrocatalytic Hydrogen Evolution

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FeNi3/NiFeOx Nanohybrids as Highly Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Cited by 95 publications

References 59 publications

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

Synergistic Nanotubular Copper‐Doped Nickel Catalysts for Hydrogen Evolution Reactions

A review of transition metal‐based bifunctional oxygen electrocatalysts

Tailoring Active Sites in Mesoporous Defect‐Rich NC/Vo‐WON Heterostructure Array for Superior Electrocatalytic Hydrogen Evolution

Contact Info

Product

Resources

About

FeNi₃/NiFeO_x Nanohybrids as Highly Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Tailoring Active Sites in Mesoporous Defect‐Rich NC/V_o‐WON Heterostructure Array for Superior Electrocatalytic Hydrogen Evolution