V-Ni3FeN/Ni-coated N-GTs full-electrolysis water electric catalyst constructed based on doping and heterojunction strategies

A technology of v-ni3fen and catalyst, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of high cost, low storage, hindering large-scale commercial application, etc., to improve activity, improve hydrogen evolution and oxygen evolution performance, excellent The effect of electrocatalytic performance

Pending Publication Date: 2022-03-11
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

However, high cost and low reserves hinder their large-scale commercial application

Method used

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  • V-Ni3FeN/Ni-coated N-GTs full-electrolysis water electric catalyst constructed based on doping and heterojunction strategies
  • V-Ni3FeN/Ni-coated N-GTs full-electrolysis water electric catalyst constructed based on doping and heterojunction strategies
  • V-Ni3FeN/Ni-coated N-GTs full-electrolysis water electric catalyst constructed based on doping and heterojunction strategies

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Embodiment 1

[0022] The total electrocatalyst V-Ni for water splitting described in this embodiment 3 The preparation method of FeN / Ni@N-GTs comprises the following steps:

[0023] (1) Weigh 0.108mmol Na 3 VO 4 , 4 mmol NH 4 F and 8mmol CH 4 N 2 O was dissolved in 70mL of distilled water, and 2mmol of nickel nitrate and iron nitrate were weighed at a molar ratio of 5:1, dissolved in the above solution, and transferred to the reaction kettle (100ml), and the nitrogen-doped graphite grown on the graphite sheet was Immerse the graphene tube in the reactor for hydrothermal reaction, the reaction temperature is 120°C, the reaction time is 6h, then wash and dry the product to obtain the V-doped NiFe precursor supported on the nitrogen-doped graphene tube;

[0024] (2) Put the product of step (1) into a tube furnace, heat it up to 470°C at 5°C / min in an Ar atmosphere, turn off the argon gas, and at this temperature, feed ammonia gas for 2h, and cool to room temperature, Obtain the full spli...

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Abstract

The invention discloses a V-Ni3FeN / Ni (at) N-GTs full electrolysis water electric catalyst constructed on the basis of doping and heterojunction strategies. The preparation method comprises the following steps: firstly, growing a V-doped Ni Fe precursor on a nitrogen-doped graphene tube carrier through a hydrothermal method, then heating to 470 DEG C in a tubular furnace, introducing ammonia gas, and nitriding for 2 hours to obtain the electrocatalyst consisting of V-doped Ni3FeN and Ni nanoparticles grown on the nitrogen-doped graphene tube in situ, namely V-Ni3FeN / Ni-N-GTs. Based on the synergistic effects of effective regulation and control of V doping on Ni and Fe electronic structures in Ni3FeN, rearrangement of charges induced by a heterojunction interface of V-Ni3FeN and Ni, good conductivity of a nitrogen-doped graphene tube carrier and the like, the electrocatalyst shows excellent electrocatalytic activity and stability in hydrogen evolution reaction and oxygen evolution reaction in an alkaline medium; the catalyst can be used as an anode catalyst and a cathode catalyst at the same time, is used for catalyzing a full hydrolysis reaction, can reach the current density of 10mA cm <-2 > only by needing the cell voltage of 1.55 V, and shows excellent stability.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, in particular to a V-Ni based on doping and heterojunction strategies 3 FeN / Ni@N-GTs total water splitting electrocatalyst and its preparation and application. Background technique [0002] With the advantages of high mass-to-energy density and no carbon emissions, hydrogen energy is widely regarded as a sustainable alternative energy source that can solve environmental problems caused by the consumption of traditional fossil energy. Electrocatalytic water splitting is an effective way to obtain clean hydrogen fuels, involving two half-reactions: cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER), both of which rely on efficient electrocatalysts. So far, Pt- and Ir / Ru-oxide-based catalysts are still considered as ideal electrocatalysts for HER and OER. However, high cost and low reserves hinder their large-scale commercial application. A to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/054C25B11/091C25B11/055C25B1/04
CPCC25B11/054C25B11/091C25B11/055C25B1/04Y02E60/36
Inventor 宋冠英李镇江骆思琪孟阿兰赵健周晴邹家琛
Owner QINGDAO UNIV OF SCI & TECH
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