Phosphorus-driven mesoporous Co3O4 nanosheets with tunable oxygen vacancies for the enhanced oxygen evolution reaction

Xu, Qiucheng; Jiang, Hao; Zhang, Haoxuan; Li, Chunzhong

doi:10.1016/j.electacta.2017.11.028

Cited by 128 publications

(68 citation statements)

References 37 publications

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“…As expected, the semicircle of P‐Co 9 S 8 nanocages is much smaller than that of Co 9 S 8 and CoS 2 , which indicates the higher electrical conductivity of P‐Co 9 S 8 (Figure S13a, Supporting Information). The improved electrical conductivity caused by P incorporation is in a good agreement with the DOS results and the prvious reports . Moreover, the fitted values based on the equivalent electric circuit (Figure S13b, Supporting Information) is calculated in Table S2 in the Supporting Information.…”

Section: Resultssupporting

confidence: 88%

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Qiu

Cai

Wang

et al. 2019

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The improvement of activity of electrocatalysts lies in the increment of the density of active sites or the enhancement of intrinsic activity of each active site. A common strategy to realize dual active sites is the use of bimetal compound catalysts, where each metal atom contributes one active site. In this work, a new concept is presented to realize dual active sites with tunable electron densities in monometal compound catalysts. Dual Co2+ tetrahedral (Co2+(Td)) and Co3+ octahedral (Co3+(Oh)) coordination active sites are developed and adjustable electron densities on the Co2+(Td) and Co3+(Oh) are further achieved by phosphorus incorporation (P‐Co9S8). The experimental results and density functional theory calculations show that the nonmetal P doping can systematically modulate charge density of Co2+(Td) and Co3+(Oh) in P‐Co9S8 and simultaneously improve the electrical conductivity of Co9S8, which substantially enhances oxygen evolution reaction performance of P‐Co9S8.

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Section: Resultssupporting

confidence: 88%

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Qiu

Cai

Wang

et al. 2019

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“…In comparison with pristine NiCo 2 O 4 , the peak attributed to oxygen vacancy sites (531.2 eV) is clearly enhanced for P–NiCo 2 O 4‐ x , indicating an increased concentration of oxygen defect sites after phosphating surface treatment. In the meantime, the intensity of the MO peak for P–NiCo 2 O 4‐ x sample becomes lower owing to the increased oxygen vacancies and weakened MO bonds . Besides, the P–NiCo 2 O 4‐ x sample shows a obviously enhanced OH peak at 532.5 eV, which stems from surface‐absorbed water during the thermal decomposition of phosphorus source process (2NaH 2 PO 2 ·H 2 O = PH 3 + Na 2 HPO 4 + 2H 2 O) .…”

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confidence: 99%

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

et al. 2018

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The development of high-capacity, Earth-abundant, and stable cathode materials for robust aqueous Zn-ion batteries is an ongoing challenge. Herein, ultrathin nickel cobaltite (NiCo O ) nanosheets with enriched oxygen vacancies and surface phosphate ions (P-NiCo O ) are reported as a new high-energy-density cathode material for rechargeable Zn-ion batteries. The oxygen-vacancy and surface phosphate-ion modulation are achieved by annealing the pristine NiCo O nanosheets using a simple phosphating process. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of active sites, the optimized P-NiCo O nanosheet electrode delivers remarkable capacity (309.2 mAh g at 6.0 A g ) and extraordinary rate performance (64% capacity retention at 60.4 A g ). Moreover, based on the P-NiCo O cathode, our fabricated P-NiCo O //Zn battery presents an impressive specific capacity of 361.3 mAh g at the high current density of 3.0 A g in an alkaline electrolyte. Furthermore, extremely high energy density (616.5 Wh kg ) and power density (30.2 kW kg ) are also achieved, which outperforms most of the previously reported aqueous Zn-ion batteries. This ultrafast and high-energy aqueous Zn-ion battery is promising for widespread application to electric vehicles and intelligent devices.

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“…Figure b shows the spectrum of Co 2p, which includes two pairs of spin‐orbit doublets arising from 2p 1/2 and 2p 3/2, as well as two shakeup satellites. Interestingly, the two well fitted peaks for 2p 3/2 could be ascribed to the Co 3+ (≈781.2 eV) and Co 2+ (≈786.7 eV), respectively . And the presence of Co 2+ means the appearance of oxygen vacancies, which is significant for the electrocatalytic performances for OER .…”

Section: Resultsmentioning

confidence: 95%

3D‐1D Heterostructure of CoZn Oxyphosphide Nanosheets Anchored on Carbon Nanotubes as Electrocatalysts for the Oxygen Evolution Reaction

Zhang

Liu

et al. 2018

ChemElectroChem

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Realizing high‐efficiency electrochemical transformation of water is of paramount significance in the field of energy storage and conversion but still a major challenge. Herein, we successfully design and fabricate a class of 3D‐1D heterostructure of 3D CoZn oxyphosphide nanosheet assemblies anchored on 1D carbon nanotubes through a facile one‐pot method. Interestingly, owing to the doping of phosphorus atoms, modified electronic structures, as well as high surface areas, the well‐designed 3D‐1D CoZnP/CNTs nanohybrids exhibit excellent electrocatalytic performances toward oxygen evolution reaction, which needs an overpotential of only 281 mV to achieve a current density of 10 mA cm−2 and exhibits no evidences for activity degradation for 24 h, holding great potentials for acting as highly efficient electrocatalysts for the oxygen evolution reaction. This work may offer new options for constructing promising nanocatalysts with well‐defined heterostructure for water splitting and beyond.

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Phosphorus-driven mesoporous Co3O4 nanosheets with tunable oxygen vacancies for the enhanced oxygen evolution reaction

Cited by 128 publications

References 37 publications

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

3D‐1D Heterostructure of CoZn Oxyphosphide Nanosheets Anchored on Carbon Nanotubes as Electrocatalysts for the Oxygen Evolution Reaction

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Phosphorus-driven mesoporous Co3O4 nanosheets with tunable oxygen vacancies for the enhanced oxygen evolution reaction

Cited by 128 publications

References 37 publications

Phosphorus Incorporation into Co9S8 Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co9S8 Nanocages for Highly Efficient Oxygen Evolution Catalysis

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

3D‐1D Heterostructure of CoZn Oxyphosphide Nanosheets Anchored on Carbon Nanotubes as Electrocatalysts for the Oxygen Evolution Reaction

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Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis