Template-free synthesis of Co3O4 microtubes for enhanced oxygen evolution reaction

Hu, Jiani; Zhang, Xiaofeng; Xiao, Juan; Li, Ruchun; Wang, Yi; Song, Shuqin

doi:10.1016/s1872-2067(21)63902-5

Cited by 21 publications

(10 citation statements)

References 44 publications

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“…Figure a demonstrates that the calculated Δ G H * value of Ni-W 2 N is only −0.175 eV, which is close to the first-rank value of 0 eV. , Pure W 2 N has too strong an affinity for H* (−0.256 eV). What is more, Ni-W 2 N has an excellent Δ G OH * value of −1.105 eV, which is closer to the first-rank value than that of pure W 2 N (−0.59 1 eV). − The calculation results show that Ni doping of W 2 N can reduce the H binding energy as well as enhance the binding energy of OH and show better adsorption energy of hydrogen and hydroxide, which contributes to the excellent HER activity. − …”

mentioning

confidence: 78%

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Dan

Liang

Gong

et al. 2022

ACS Materials Lett.

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Transition metal nitrides and elemental doping are effective methods to enhance the catalytic activity of hydrogen evolution reaction (HER) at a high current density. Herein, Ni-W2N@NF was synthesized to exhibit excellent HER performance in an alkaline environment. Not only theoretical but also experimental analyses prove that Ni enters the W2N lattice in the form of substitutional doping. Ni-doped W2N optimizes the free energy of hydrogen adsorption and hydroxide adsorption. Thus, the HER kinetics are accelerated. Therefore, the synthesized Ni-W2N@NF achieved an industrial high current density of 2000 mA cm–2 in 1 M KOH with a small overpotential of 317 mV. The HER activity of Ni-W2N@NF is superior to those of most reports. What is more, the obtained catalyst achieves a current density of 1500 mA cm–2 in an alkaline seawater solution with an overpotential of only 345 mV and exhibits excellent cycling stability. This work will offer a feasible idea for a designing platinum group metals free metal as an effective catalyst for HER reaction under an industrial large current in an alkaline solution.

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mentioning

confidence: 78%

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Dan

Liang

Gong

et al. 2022

ACS Materials Lett.

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“…Transition metal oxide Co 3 O 4 is a promising OER nonnoble metal electrolyte with mixed Co 2+ and Co 3+ species [29,30]. In the present work, we prepared a series of Co-defected Co 3 O 4 with varied contents of Co defects and explored the effect of electron spin polarization regulated by metal defect content on OER activity.…”

Section: Introductionmentioning

confidence: 99%

Manipulating Spin Polarization of Defected Co3O4 for Highly Efficient Electrocatalysis

Wang

Asim

et al. 2022

Trans. Tianjin Univ.

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Electrocatalytic water splitting is limited by kinetics-sluggish oxygen evolution, in which the activity of catalysts depends on their electronic structure. However, the influence of electron spin polarization on catalytic activity is ambiguous. Herein, we successfully regulate the spin polarization of Co3O4 catalysts by tuning the concentration of cobalt defects from 0.8 to 14.5%. X-ray absorption spectroscopy spectra and density functional theory calculations confirm that the spin polarization of Co3O4 is positively correlated with the concentration of cobalt defects. Importantly, the enhanced spin polarization can increase hydroxyl group absorption to significantly decrease the Gibbs free energy change value of the OER rate-determining step and regulate the spin polarization of oxygen species through a spin electron-exchange process to easily produce triplet-state O2, which can obviously increase electrocatalytic OER activity. In specific, Co3O4-50 with 14.5% cobalt defects exhibits the highest spin polarization and shows the best normalized OER activity. This work provides an important strategy to increase the water splitting activity of electrocatalysts via the rational regulation of electron spin polarization.

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“…[ 38–40 ] It is worth noting that through crystal surface engineering, exposing different crystal faces and adjusting the catalytic sites on the Co 3 O 4 surface can enable appropriate bond strength between substrates and active sites, thus improving the catalytic performance. [ 38,41,42 ] From the atomic arrangements of Co 3 O 4 (001) and Co 3 O 4 (112) surfaces (Figure S1, Supporting Information), the (001) surface contains only tetrahedral coordination Co 2+ (Co 2+ Td ) sites, while the (112) surface contains both Co 2+ Td and octahedral coordination Co 3+ (Co 3+ Oh ) sites. It can be predicted that the Co 3 O 4 (001) and Co 3 O 4 (112) will exhibit different catalytic behaviors due to the regulation of oxidation states, which is able to enhance the LiPSs catalytic conversion toward amplified Li–S electrochemistry.…”

Section: Introductionmentioning

confidence: 99%

“…[38][39][40] It is worth noting that through crystal surface engineering, exposing different crystal faces and adjusting the catalytic sites on the Co 3 O 4 surface can enable appropriate bond strength between substrates and active sites, thus improving the catalytic performance. [38,41,42] From the atomic arrangements of Oh cations, can not only provide potent sulfur immobilization to effectively inhibit shuttle effect, but also dynamically accelerate LiPSs catalytic conversion to realize superior sulfur redox kinetics, giving rise to amplified Li-S performance.…”

Section: Introductionmentioning

confidence: 99%

Oxidation States Regulation of Cobalt Active Sites through Crystal Surface Engineering for Enhanced Polysulfide Conversion in Lithium–Sulfur Batteries

et al. 2022

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In this work, unique Co 3 O 4 /N-doped reduced graphene oxide (Co 3 O 4 /N-rGO) composites as favorable sulfur immobilizers and promoters for lithium-sulfur (Li-S) batteries are developed. The prepared Co 3 O 4 nanopolyhedrons (Co 3 O 4 -NP) and Co 3 O 4 nanocubes mainly expose (112) and (001) surfaces, respectively, with different atomic configurations of Co 2+ /Co 3+ sites. Experiments and theoretical calculations confirm that the octahedral coordination Co 3+ (Co 3+ Oh ) sites with different oxidation states from tetrahedral coordination Co 2+ sites optimize the adsorption and catalytic conversion of lithium polysulfides. Specially, the Co 3 O 4 -NP crystals loaded on N-rGO expose (112) planes with ample Co 3+Oh active sites, exhibiting stronger adsorbability and superior catalytic activity for polysulfides, thus inhibiting the shuttle effect. Therefore, the S@Co 3 O 4 -NP/N-rGO cathodes deliver excellent electrochemical properties, for example, stable cyclability at 1 C with a low capacity decay rate of 0.058% over 500 cycles, superb rate capability up to 3 C, and high areal capacity of 4.1 mAh cm −2 . This catalyst's design incorporating crystal surface engineering and oxidation state regulation strategies also provides new approaches for addressing the complicated issues of Li-S batteries.

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Template-free synthesis of Co3O4 microtubes for enhanced oxygen evolution reaction

Cited by 21 publications

References 44 publications

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Manipulating Spin Polarization of Defected Co3O4 for Highly Efficient Electrocatalysis

Oxidation States Regulation of Cobalt Active Sites through Crystal Surface Engineering for Enhanced Polysulfide Conversion in Lithium–Sulfur Batteries

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Template-free synthesis of Co3O4 microtubes for enhanced oxygen evolution reaction

Cited by 21 publications

References 44 publications

Substitutional Doping Engineering toward W2N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W2N Nanorod for Hydrogen Evolution Reaction at High Current Density

Manipulating Spin Polarization of Defected Co3O4 for Highly Efficient Electrocatalysis

Oxidation States Regulation of Cobalt Active Sites through Crystal Surface Engineering for Enhanced Polysulfide Conversion in Lithium–Sulfur Batteries

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Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density