Electrocatalysis of Oxygen on Bifunctional Nickel‐Cobaltite Spinel

Alegre, Cinthia; Busacca, C.; Blasi, A. Di; Blasi, O. Di; Aricò, A.S.; Baglio, V.

doi:10.1002/celc.201901584

Cited by 28 publications

(13 citation statements)

References 58 publications

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“…Alegre et al reported a bifunctional catalyst based on nickel and cobalt spinel (NiCo 2 O 4 ) supported on electrospun carbon nanofibers. 52 The major oxidized Ni and Co species (Ni 3+ and Co 3+ ) produce high activity for OER (overpotential is 223 mV at 10 mA•cm −2 ), while the lower oxidation states of the metals (Ni 2+ , Co 2+ , Ni 0 , and Co 0 ) and the presence of N-doped carbon lead to the enhancement of oxygen reduction reaction (ORR) performance. Therefore, the design and synthesis of NiCo-based catalysts with appropriate oxidation states are an effective way to improve the OER performance.…”

Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

et al. 2021

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Electrocatalytic water splitting is a sustainable way to produce hydrogen energy, but the oxygen evolution reaction (OER) at the anode has sluggish kinetics and low energy conversion efficiency, which is the major bottleneck for large-scale hydrogen production. The design and synthesis of robust and low-cost OER catalysts are crucial for the OER. NiCo-based electrocatalysts have suitable atomic and electronic structures, and show high activity and stability during the OER process. Recently, significant progress has been made in regulating the structure and composition of NiCo-based catalysts and understanding the nature of catalysis, especially the OER mechanism, catalytic active sites, and structure–activity relationship. In this work, we summarized and discussed the latest development of NiCo-based electrocatalysts in the OER, with particular emphasis on catalyst design and synthesis, strategies for boosting OER performance, and understanding the nature of catalysis from experimental and theoretical perspectives. The OER mechanism, some activity descriptors, and atomic and electronic structure–activity relationships based on NiCo-based electrocatalysts are unveiled. Finally, some challenges and futuristic outlooks for improving the performance of NiCo-based electrocatalysts are proposed, and we hope this review can provide guidance for the design of more efficient NiCo-based electrocatalysts.

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Section: Nico-based Oer Electrocatalystsmentioning

confidence: 99%

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

et al. 2021

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“…The deconvoluted C 1s spectrum shows two dominant peaks at 284.2 eV and 284.7 eV, which correspond to C=C and C−C, respectively (Figure 5b ) . C 1s peaks at 286.1 eV and 288.8 eV can be assigned as C−O/C−N and C=O, suggesting the successful nitrogen doping and the presence of oxidized functional groups [41,42] . Three peaks are observed in N 1s signal (Figure 5c), which are associated with three different nitrogen species, namely pyridinic‐N (398.6 eV), pyrrolic‐N (400.7 eV), and graphitic‐N (403.4 eV) [43] .…”

Section: Resultsmentioning

confidence: 99%

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

Mahbub

Adios

et al. 2021

Chemistry An Asian Journal

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Design and synthesis of low‐cost and efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in Zn‐air batteries are essential and challenging. We report a facile method to synthesize heterostructure carbon consisting of graphitic and amorphous carbon derived from the agricultural waste of red bean pods. The heterostructure carbon possesses a large surface area of 625.5 m2 g−1, showing ORR onset potential of 0.89 V vs. RHE and OER overpotential of 470 mV at 5 mA cm−2. Introducing hollow FeCo nanoparticles and nitrogen dopant improves the bifunctional catalytic activity of the carbon, delivering ORR onset potential of 0.93 V vs. RHE and OER overpotential of 360 mV. Electron energy‐loss spectroscopy (EELS) O K‐edge map suggests the presence of localized oxygen on the FeCo nanoparticles, suggesting the oxidation of the nanoparticles. Zn‐air battery with these carbon‐based catalysts exhibits a peak power density as high as 116.2 mW cm−2 and stable cycling performance over 210 discharge/charge cycles. This work contributes to the advancement of bifunctional oxygen electrocatalysts while converting agricultural waste into value‐added material.

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“…Similar to the HER process, heteroatom doping effect can optimize the Gibbs free energy from *OH to *O intermediates for the improvement of the OER performance. Cobalt‐based nanomaterials including Co 3 O 4 and CoO have been proved to be efficient OER electrocatalyst due to their proper redox capability and adsorption of oxygen‐based intermediates 127‐138 . However, their insufficient conductivity of cobalt‐based oxides usually restricts them achieving a superior OER efficiency.…”

Section: Electrocatalytic Water Splitting Based On the Electrospun Namentioning

confidence: 99%

“…Cobalt-based nanomaterials including Co 3 O 4 and CoO have been proved to be efficient OER electrocatalyst due to their proper redox capability and adsorption of oxygen-based intermediates. [127][128][129][130][131][132][133][134][135][136][137][138] However, their insufficient conductivity of cobalt-based oxides usually restricts them achieving a superior OER efficiency. Fe-doping in Co-based nanomaterials can provide additional active sites and promote electron transfer capability, improving the OER activity.…”

Section: Heteroatoms Doping Effectsmentioning

confidence: 99%

Electronic modulation and interface engineering of electrospun nanomaterials‐based electrocatalysts toward water splitting

et al. 2020

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Nowdays, electrocatalytic water splitting has been regarded as one of the most efficient means to approach the urgent energy crisis and environmental issues. However, to speed up the electrocatalytic conversion efficiency of their half reactions including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), electrocatalysts are usually essential to reduce their kinetic energy barriers. Electrospun nanomaterials possess a unique one‐dimensional structure for outstanding electron and mass transportation, large specific surface area, and the possibilities of flexibility with the porous feature, which are good candidates as efficient electrocatalysts for water splitting. In this review, we focus on the recent research progress on the electrospun nanomaterials‐based electrocatalysts for HER, OER, and overall water splitting reaction. Specifically, the insights of the influence of the electronic modulation and interface engineering of these electrocatalysts on their electrocatalytic activities will be deeply discussed and highlighted. Furthermore, the challenges and development opportunities of the electrospun nanomaterials‐based electrocatalysts for water splitting are featured. Based on the achievements of the significantly enhanced performance from the electronic modulation and interface engineering of these electrocatalysts, full utilization of these materials for practical energy conversion is anticipated.

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Electrocatalysis of Oxygen on Bifunctional Nickel‐Cobaltite Spinel

Cited by 28 publications

References 58 publications

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

Electronic modulation and interface engineering of electrospun nanomaterials‐based electrocatalysts toward water splitting

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