Co9S8/graphene composite hydrogen storage material and preparation method thereof

A technology of graphene composite and hydrogen storage materials, which is applied in chemical instruments and methods, hydrogen production, cobalt compounds, etc., can solve the problems of poor cycle stability, low performance, and low hydrogen storage performance, and achieve high safety and preparation Simple process and excellent electrochemical hydrogen storage performance

Active Publication Date: 2014-12-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a Co 9 S 8 / Graphene composite hydrogen storage material and preparation method thereof

Method used

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  • Co9S8/graphene composite hydrogen storage material and preparation method thereof
  • Co9S8/graphene composite hydrogen storage material and preparation method thereof
  • Co9S8/graphene composite hydrogen storage material and preparation method thereof

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specific Embodiment approach 1

[0017] Specific implementation mode one: the Co of this embodiment mode 9 S 8 / Graphene composite hydrogen storage material is a layered structure, Co 9 S 8 Attached to the surface of graphene sheets, where graphene and Co 9 S 8 The molar ratio is 1:(5~7).

specific Embodiment approach 2

[0018] Embodiment 2: Preparation of the Co described in Embodiment 1 9 S 8 The method for / graphene composite hydrogen storage material, carries out as follows:

[0019] 1. Mix cobalt powder and sulfur powder according to the molar ratio of 1: (0.9-1.1) to obtain mixed powder I;

[0020] 2. Press ZrO 2 The mass ratio of the grinding ball to the mixed powder I is (10-15): 1, and the ZrO 2 Grinding balls and mixed powder Ⅰ loaded with ZrO 2 Fill the lined ball milling tank with high-purity argon, and finally fix the ball milling tank in the ball mill, and mill it for 8-12 hours at the speed of the ball mill at 600-800 rpm. After the ball milling is completed and the ball milling tank is cooled to room temperature, the obtained co 9 S 8 powder;

[0021] 3. According to graphene and Co 9 S 8 The molar ratio of the powder is 1: (5-7) for mixing to obtain the mixed powder II;

[0022] 4. Press ZrO 2 The mass ratio of the grinding ball to the mixed powder II is (15-20): 1, ...

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 2 in that the high-purity argon described in steps 2 and 4 refers to argon with a mass percentage concentration greater than 99.999%. Others are the same as in the second embodiment.

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Abstract

The invention discloses a Co9S8 / graphene composite hydrogen storage material and a preparation method thereof, relates to a Co hydrogen storage material and a preparation method thereof, and solves the technical problems of poor hydrogen storage performance, relatively poor performance under high-density discharge current, and relatively poor circulation stability in an existing Co hydrogen storage material. The Co9S8 / graphene composite hydrogen storage material is of a layered structure, and Co9S8 is adhered to the surface of a graphene sheet layer. The preparation method comprises the following steps: performing high-energy ball milling on Co powder and S powder to obtain Co9S8 powder, and performing high-energy ball milling on graphene and Co9S8 to obtain the Co9S8 / graphene composite hydrogen storage material. The maximal hydrogen storage capacity of the hydrogen storage material can reach 3.73wt%; the Co9S8 / graphene composite hydrogen storage material is prepared into a battery; the hydrogen storage capacity is still more than 88% after circulation for 20 times; under the condition that the discharge current density is 1,000mA / g, the discharge capacity of the hydrogen storage material is still more than 80%; the hydrogen storage material can be used in the field of hydrogen storage.

Description

technical field [0001] The invention relates to a hydrogen storage material and a preparation method thereof. Background technique [0002] With the reduction of fossil energy and the aggravation of environmental pollution, countries around the world continue to increase the development of new energy in order to find an efficient, clean and pollution-free energy. Hydrogen is extremely abundant in nature, has the highest energy-to-mass ratio, is clean and non-polluting, and is expected to become a major clean energy source in the future. Therefore, hydrogen energy, as a new clean energy system, has become the focus of research. However, hydrogen energy is not easy to store and is difficult to use on a large scale. After long-term research, scientists have found that some solid hydrides can store hydrogen, so the research focus of hydrogen storage technology has turned to solid hydrogen storage materials. Among many hydrogen storage materials, Co-based hydrogen storage system...

Claims

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Application Information

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IPC IPC(8): C01B3/02C01B31/04C01G51/00
Inventor 秦伟韩璐高鹏
Owner HARBIN INST OF TECH
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