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High-performance oxygen evolution CoO@Co-NC/C composite catalyst as well as preparation method and application thereof

A composite catalyst, high-performance technology, applied in the field of electrocatalysis, can solve the problems of low activity and electrical conductivity, and achieve the effects of simple preparation method, improved activity and stability, and improved stability

Active Publication Date: 2018-11-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the shortcomings of single Co and CoO as OER catalysts in the prior art, which have low activity and low conductivity, one of the purposes of the present invention is to provide a Co-coated CoO nanoparticle and nitrogen-doped carbon that are jointly supported on a carbon material. Composition, the comprehensive catalytic performance is close to or even exceeds that of RuO 2 Oxygen evolution over commercial catalysts CoO@Co-NC / C composite catalysts

Method used

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  • High-performance oxygen evolution CoO@Co-NC/C composite catalyst as well as preparation method and application thereof
  • High-performance oxygen evolution CoO@Co-NC/C composite catalyst as well as preparation method and application thereof
  • High-performance oxygen evolution CoO@Co-NC/C composite catalyst as well as preparation method and application thereof

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Embodiment 1

[0031] Preparation of CoO@Co-NC / Ketjen Black (KB)

[0032] The synthesis method adopts two-stage high-temperature treatment, and the specific process is as follows: Weigh 1mmol cobalt acetate tetrahydrate, 5g urea and 0.25g Ketjen black, add 50mL deionized water, dissolve or disperse by ultrasonication for 30min, and evaporate and dry at 80°C dry moisture. The obtained precursor mixture was heated from room temperature to 550 °C in a nitrogen protective gas at a heating rate of 5 °C / min and kept for 2 h; then continued to be heated at a rate of 5 °C / min to 700 °C and kept for 2 h. Naturally cooled to room temperature and taken out to obtain Co@CoO-NC / KB.

[0033] X-ray diffractometer (XRD, D8ADVANCE, Cu-Kα, ) to conduct phase analysis of the product; through transmission electron microscopy (JEOL-2010, 200kV) to conduct transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) to characterize the product’s morphology; elements on th...

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Abstract

The invention discloses a high-performance oxygen evolution CoO@Co-NC / C composite catalyst as well as preparation method and application thereof. The composite catalyst is prepared by loading Co-coated CoO nano particles and nitrogen doped carbon on a carbon material; the preparation method comprises the following steps: mixing a nitrogen-containing organic small molecule compound, the carbon material and organic acid cobalt salt through a liquid phase, and performing evaporation and drying to obtain mixed powder; putting the mixed powder in a protection atmosphere, and performing two-stage roasting treatment to obtain the CoO@Co-NC / C composite catalyst. The preparation method is simple, low in cost and favorable for industrial production; the prepared CoO@Co-NC / C composite catalyst is applied to water decomposition or the storage and conversion system of renewable resources such as metal-air secondary batteries, and has the characteristics of high activity and high stability; comparedwith a RuO2 commercial catalyst, the CoO@Co-NC / C composite catalyst has better comprehensive performance and shows a good application prospect.

Description

technical field [0001] The present invention relates to an oxygen evolution (OER) catalyst and its preparation and application method, in particular to a high-performance oxygen evolution CoO@Co-NC / C composite catalyst and its preparation method, and also to a CoO@Co-NC / C composite The application of the catalyst in water splitting or metal-air secondary batteries belongs to the technical field of electrocatalysis. technical background [0002] The oxygen evolution reaction (OER) is crucial for renewable energy storage and conversion systems such as water splitting and metal-air secondary batteries. However, the complex four-electron process leads to its slow kinetics. Therefore, highly efficient electrocatalysts are essential to accelerate the OER rate and reduce the overpotential. Currently, Ir-based or Ru-based nanomaterials are considered as state-of-the-art electrocatalysts due to their unattainable high activity. However, scarcity, high cost, and poor stability seve...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06
CPCC25B1/04B01J27/24C25B11/091B01J35/33Y02E60/36
Inventor 钱东刘桂雨刘金龙李俊华徐德垚苏侃达
Owner CENT SOUTH UNIV
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