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Self-supported Ni2P/Ni@C composite cathode hydrogen evolution material and preparation method thereof

A composite cathode, self-supporting technology, applied in chemical instruments and methods, electrodes, electrode shapes/types, etc., can solve problems affecting the surface activity of nickel phosphide

Inactive Publication Date: 2020-02-21
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional method of preparing nickel phosphide is mainly to synthesize powder materials by hydrothermal method, and then use a third-party bonding agent to adhere the nano-powder to the surface of a metal current collector with good conductivity. This process is aided by bonding due to electron transport. The hindrance of the agent greatly affects the real application surface activity of nickel phosphide

Method used

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  • Self-supported Ni2P/Ni@C composite cathode hydrogen evolution material and preparation method thereof
  • Self-supported Ni2P/Ni@C composite cathode hydrogen evolution material and preparation method thereof
  • Self-supported Ni2P/Ni@C composite cathode hydrogen evolution material and preparation method thereof

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Embodiment Construction

[0015] Take an area of ​​1×2cm 2 The porous Ni@C material was cleaned with deionized water and absolute ethanol, respectively. Weigh 0.21g nickel sulfate hexahydrate (NiSO 4 ·6H 2 O), 0.06g ammonium fluoride (NH 4 F) and 0.24g urea [CO(NH 2 ) 2 ] was dissolved in 20mL of deionized water, stirred to dissolve completely, then transferred to a polytetrafluoroethylene autoclave, and the porous Ni@C composite substrate was placed in the autoclave, and reacted at a constant temperature of 140°C for 5h, and the material was cooled Take it out, wash it with ethanol, and dry it in vacuum at 50° C. for 2 hours to obtain a precursor of nickel hydroxide. Finally, the porcelain boat containing the precursor was put into the tube furnace, nitrogen was used as the protective gas, and 0.2g NaH 2 PO 2 ·H 2 O is placed at the front of the nitrogen flow, kept at 400°C for 2 hours, and cooled to room temperature to obtain Ni with multidimensional pore morphology. 2 P / Ni@C composites.

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Abstract

The invention provides a self-supported Ni2P / Ni@C electro-catalytic hydrogen evolution cathode material with a flaky composite porous structure and a preparation method thereof. The preparation methodcomprises the following steps: 1, preparing a porous Ni@C material substrate by a powder metallurgy method; 2, performing hydrothermal in-situ growth of Ni(OH)2 precursor on the porous Ni@C substrate; and 3, adopting low-temperature gas-phase reaction technology to phosphatize Ni(OH)2 / Ni@C to obtain the self-supported Ni2P / Ni@C material. The obtained material has a rich and communicated three-dimensional porous structures, an active substance grows on the surface of the self-supported porous substrate in situ and completely does not depend on a third-party bonding auxiliary agent, the barrierof the bonding auxiliary agent on electron transfer of a current collector is avoided, and the self-supported Ni2P / Ni@C electro-catalytic hydrogen evolution cathode material is very suitable for theapplication fields of electro-catalytic reaction process, electrochemical energy storage and the like.

Description

Technical field: [0001] The invention relates to a self-supporting Ni with sheet-like composite porous structure 2 The preparation method of P / Ni@C electrocatalytic hydrogen evolution cathode material combines powder metallurgy, hydrothermal synthesis and low temperature gas phase reaction technology to synthesize composite porous materials in situ for electrocatalytic hydrogen evolution reaction. The obtained cathode material has a rich and connected three-dimensional porous structure, and the active material grows in situ on the surface of the self-supporting porous substrate without relying on the third-party bonding agent at all, avoiding the obstacle of the bonding agent to the current collector to transfer electrons, and it is a composite cathode. Design and preparation provide new ideas. This Ni 2 P / Ni@C composite self-supporting materials are very suitable for applications such as electrocatalytic processes and electrochemical energy storage. Background technique: ...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/04C25B11/03B01J27/185
CPCC25B11/03C25B1/04B01J27/1853C25B11/051C25B11/091B01J35/33Y02E60/36
Inventor 喻林萍滕向桂陈龙李思男
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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