Striking hierarchical urchin-like peapoded NiCo2O4@C as advanced bifunctional electrocatalyst for overall water splitting

Deng, Ju; Zhang, Huijuan; Zhang, Yan; Luo, Pan; Liu, Li; Wang, Yu

doi:10.1016/j.jpowsour.2017.10.062

Cited by 55 publications

(32 citation statements)

References 52 publications

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“…Similarly, Co 2p (Figure b) spectra exhibit two spin‐orbit doublets in the 2p 1/2 and 2p 3/2 energy levels as well as two shake up satellite peak characteristics of Co 2+ and Co 3+ . In the Ni 2p spectra, the fitting peaks at 854.1 and 871.6 eV correspond to Ni 2+ , and the peaks at 855.9 eV and 873.3 eV correspond to Ni 3+ . In the Co 2p spectra, the binding energy at 780 and 795.2 eV are ascribed to Co 3+ , whereas the peaks at 782 and 796.9 eV are ascribed to Co 2+ .…”

Section: Resultsmentioning

confidence: 93%

“…The deconvoluted spectra of Ti 2p, Co 2p, Ni 2p and O 1s of NiCo 2 O 4 /TiO 2 are shown in Figure . The Ni 2p spectra (Figure a) exhibit two spin‐orbit doublets in the 2p 1/2 and 2p 3/2 energy levels and two shake up satellite peak features of Ni 2+ and Ni 3+ . Similarly, Co 2p (Figure b) spectra exhibit two spin‐orbit doublets in the 2p 1/2 and 2p 3/2 energy levels as well as two shake up satellite peak characteristics of Co 2+ and Co 3+ .…”

Section: Resultsmentioning

confidence: 95%

“…The Ni 2p spectra (Figure a) exhibit two spin‐orbit doublets in the 2p 1/2 and 2p 3/2 energy levels and two shake up satellite peak features of Ni 2+ and Ni 3+ . Similarly, Co 2p (Figure b) spectra exhibit two spin‐orbit doublets in the 2p 1/2 and 2p 3/2 energy levels as well as two shake up satellite peak characteristics of Co 2+ and Co 3+ . In the Ni 2p spectra, the fitting peaks at 854.1 and 871.6 eV correspond to Ni 2+ , and the peaks at 855.9 eV and 873.3 eV correspond to Ni 3+ .…”

Section: Resultsmentioning

confidence: 95%

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

2018

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Exploring the generation of efficient and long‐lasting bifunctional electrocatalysts obtained from low‐cost transition metal oxides is crucial to the optimal production of hydrogen and oxygen by electrocatalytic water splitting. This study aims to demonstrate the applicability of layered TiO2 nanosheets as support for designing electrocatalysts. We have demonstrated the performance by decorating the TiO2 support with NiCo2O4 nanoparticles (NiCo2O4/TiO2) as catalysts for electrocatalytic overall water splitting. Moreover, the corrosion effect of usually used carbon‐based supporting materials can decrease the working efficiency and, thus, the overall performance of the catalysts. In this aspect, TiO2 can be a better alternative to carbon‐based systems. Layered TiO2 was synthesized at room temperature, and a simple heat treatment protocol was employed for the large‐scale synthesis of NiCo2O4/TiO2. TiO2 facilitated the formation of smaller NiCo2O4 nanoparticles, also improving the dispersion. This bifunctional electrocatalyst exhibits high OER and HER performance with a low overpotential of 309 mV and 185 mV respectively, at a current density of 10 mA cm−2. TiO2 supported catalyst also exhibits other advantages like remarkable durability in the alkaline medium along with high turnover frequency (TOF) values. This inexpensive catalyst can deliver a current density of 10 mA cm−2 at only 1.64 V with a steady performance for more than 12 h for overall water splitting. Thus, this homemade system provides a proficient and low‐cost alternative to the more expensive systems such as RuO2, IrO2 or Pt for the electrochemical water splitting applications.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 95%

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

2018

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“…However,N ibased oxide catalysts tend to decompose gradually with the passage of time, probably owing to their amorphous nature. Nevertheless, largee lectrochemical active surface area (ECSA) amorphous structures are crucial for developing Nibased OER electrocatalysts with high activity.P ristine NiCo 2 O 4, [22] as well as supported NiCo 2 O 4 [23] and NiMoO 4 , [13][14][15] also show as imilar trend. Nevertheless, largee lectrochemical active surface area (ECSA) amorphous structures are crucial for developing Nibased OER electrocatalysts with high activity.P ristine NiCo 2 O 4, [22] as well as supported NiCo 2 O 4 [23] and NiMoO 4 , [13][14][15] also show as imilar trend.…”

Section: Ni-based Alloy Oer Electrocatalystsmentioning

confidence: 75%

Nickel‐Based Transition Metal Nitride Electrocatalysts for the Oxygen Evolution Reaction

et al. 2019

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Electrocatalysis is an efficient and promising means of energy conversion, with minimal environmental footprint. To enhance reaction rates, catalysts are required to minimize overpotential. Alternatives to noble metal electrocatalysts are essential to address these needs on a large scale. In this context, transition metal nitride (TMN) nanoparticles have attracted much attention owing to their high catalytic activity, distinctive electronic structures, and enhanced surface morphologies. Nickel‐based materials are an ideal choice for electrocatalysts given nickel's abundance and low cost in comparison to noble metals. In this Minireview, advancements made specifically in Ni‐based binary and ternary TMNs as electrocatalysts for the oxygen evolution reaction (OER) are critically evaluated. When used as OER electrocatalysts, Ni‐based nanomaterials with 3 D architectures on a suitable support (e.g., a foam support) speed up electron transfer as a result of well‐oriented crystal structures and also assist intermediate diffusion, during reaction, of evolved gases. 2 D Ni‐based nitride sheet materials synthesized without supports usually perform better than 3 D supported electrocatalysts. The focus of this Minireview is a systematic description of OER activity for state‐of‐the‐art Ni‐based nitrides as nanostructured electrocatalysts.

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“…4) The highly conductive CNWs facilitate a faster charge transfer during electrocatalytic reactions . 5) The porous CNWs can not only guarantee the structural stability of the CoFe nanoparticles but also expedite the diffusion of gas bubbles (hydrogen and oxygen), further promoting the catalytic activity of CoFe@CNWs …”

Section: Resultsmentioning

confidence: 99%

Self‐Assembled CoFe Nanoparticle‐Embedded Carbon Nanowires as Efficient Nonprecious Catalyst for Overall Water Splitting

et al. 2019

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At present, it is still challenging to develop nonprecious transition metal‐based electrocatalysts with a high efficiency and stability for overall water splitting. To address such issues, for the first time, a novel nonprecious hybrid electrocatalyst—a self‐assembled CoFe nanoparticle‐embedded porous carbon nanowires (CoFe@CNWs)—is designed and synthesized via a facile hydrothermal reaction and subsequent annealing process. This hybrid electrocatalyst demonstrates an outstanding performance for oxygen evolution reaction (OER) with a very small Tafel slope of 63 mV dec−1 and an ultralow onset overpotential of 170 mV; particularly, when the hybrid is used for overall water splitting, the cell voltage is as low as 1.69 V at a current density of 10 mA cm−2. The excellent electrocatalytic performance of CoFe@CNWs is attributed to its unique porous nanoarchitecture, constructed by ultrasmall conductive CoFe nanoparticles homogenously embedded in highly conductive CNWs, which would not only guarantee abundant catalytic sites and structural stability but also facilitate electron transportation, resulting in a significant improvement in the electrocatalytic performance. This work provides a strategy to rationally design and synthesize a nanostructured transition metal‐based hybrid to be used as a highly effective and stable nonprecious electrocatalyst for overall water splitting.

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Striking hierarchical urchin-like peapoded NiCo2O4@C as advanced bifunctional electrocatalyst for overall water splitting

Cited by 55 publications

References 52 publications

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Nickel‐Based Transition Metal Nitride Electrocatalysts for the Oxygen Evolution Reaction

Self‐Assembled CoFe Nanoparticle‐Embedded Carbon Nanowires as Efficient Nonprecious Catalyst for Overall Water Splitting

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Striking hierarchical urchin-like peapoded NiCo2O4@C as advanced bifunctional electrocatalyst for overall water splitting

Cited by 55 publications

References 52 publications

Layered TiO2 Nanosheet‐Supported NiCo2O4 Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO2 Nanosheet‐Supported NiCo2O4 Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Nickel‐Based Transition Metal Nitride Electrocatalysts for the Oxygen Evolution Reaction

Self‐Assembled CoFe Nanoparticle‐Embedded Carbon Nanowires as Efficient Nonprecious Catalyst for Overall Water Splitting

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Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Layered TiO₂ Nanosheet‐Supported NiCo₂O₄ Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting