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Iron-based hydrogen production electric catalyst and preparation method

An electrocatalyst and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem that elemental iron easily corrodes iron oxides, reduces activity, and hydrogen evolution High overpotential problem

Active Publication Date: 2018-01-12
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a hydrogen evolution electrocatalyst, elemental iron has obvious limitations: first, its hydrogen evolution overpotential is high, and second, elemental iron is easily corroded to form iron oxide, which further reduces its activity.

Method used

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  • Iron-based hydrogen production electric catalyst and preparation method
  • Iron-based hydrogen production electric catalyst and preparation method
  • Iron-based hydrogen production electric catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Fe@Fe 2 o 3 Photochemical reduction preparation of catalysts and dye-sensitized photocatalytic hydrogen production performance.

[0022] (1) Preparation of Fe by microwave method 2 o 3 . 0.24 g FeCl 3 , 9 g urea, 0.014 g PEG-4000 (polyethylene glycol), dissolved in 150 mL deionized water. Place in a 500 mL three-necked flask, and heat in a microwave at 630 W for 10 min. Cool to room temperature, wash with water 5 times after centrifugation, and dry at 60°C. Reddish-brown Fe can be obtained after grinding 2 o 3 .

[0023] (2) Preparation of Fe@Fe by photochemical reduction 2 o 3 . Take 10~50 mg of Fe prepared above 2 o 3 Place in a 100 mL solution consisting of 95 mL of trimethylamine solution at pH=11 (volume ratio of trimethylamine to water=1:49) and 5 mL of a concentration of 1.0×10 -3 mol / L eosin solution mixed. Sonicate for 10 min to make Fe 2 o 3 Evenly dispersed in the solution. The solution was put into a 150 mL Pyrex light bottle, ...

Embodiment 2

[0027] Example 2: Fe@FeB x Photochemical reduction preparation of electrocatalysts and electrocatalytic hydrogen production performance.

[0028] (1) Fe 2 o 3 @FeB x preparation. Dissolve 0.15 g of ferrous sulfate in 50 mL of deionized water. Dissolve 0.3 g of sodium borohydride in 20 mL of deionized water. Under stirring, the sodium borohydride solution was dropped into the ferrous sulfate solution at a rate of 0.02 mL / s, and a fluffy precipitate was formed immediately. After the dropwise addition, suction filtration was performed, and the solid phase was washed three times with water, ethanol, and acetone successively, and then dried with nitrogen or argon to obtain Fe 2 o 3 @FeB x . figure 2 For the prepared Fe 2 o 3 @FeB x Transmission electron microscopy (TEM) image. It can be seen that the shell Fe 2 o 3 The thickness is about 7 nm.

[0029] (2) Fe@FeB x Prepared by photochemical method. Take 10~50 mg of Fe 2 o 3 @FeB x Place in a 100 mL solution co...

Embodiment 3

[0037] Example 3: Fe@FeB x Electrochemical preparation and electrocatalytic performance of electrocatalysts.

[0038] (1) Fe 2 o 3 @FeB x The preparation is the same as step (1) in Example 2.

[0039] (2) FeB x preparation.

[0040] pure phase FeB x Prepare according to step (1), but the whole process is carried out in an argon-filled glove box, and dry naturally in the glove box to obtain gray FeB x .

[0041] (3) Reduced iron powder.

[0042] Analytical pure reduced iron powder was purchased from Shanghai Yingyuan Chemical Co., Ltd.

[0043] (4) Preparation of Fe@FeB by electrochemical reduction x .

[0044] Will Fe 2 o 3 @FeB x Preparation of Fe@FeB by electrochemical reduction at an applied potential of -1.853 V (electrode potential relative to saturated calomel) in a two-liquid system electrolytic cell x .

[0045] (5) Fe@FeB x , reduced iron powder and pure phase FeB x Electrocatalytic hydrogen production performance.

[0046] Fe@FeB x The working ele...

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Abstract

The invention discloses an iron-based hydrogen production electric catalyst and a preparation method. The catalyst is of a core-shell structure; the core of the catalyst is FeOOH or Fe2O3, or an ironcompound of FeBx, FeSx, FePx, FeSix, FeCx or FeNx; the shell is an elementary substance Fe. The preparation method comprises the following steps: oxidizing an iron compound in the air, and forming a ferric oxide shell layer on the surface of the iron compound; reducing the oxide shell layer on the surface into an elementary iron substance Fe with a photochemical method or an electrochemical method, thereby forming the core-shell structure. After the elementary iron and the iron compound form the core-shell structure, relatively good electrocatalytic activity is achieved, and the overpotentialis greatly reduced. The catalyst has good electrochemical hydrogen production activity and stability, and dye sensitization visible light hydrogen production activity and stability.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysis, and relates to a catalyst for hydrogen production by electrolysis of water, a catalyst for hydrogen production by photocatalytic decomposition of water and a preparation method. Background technique [0002] With the development of human society, fossil fuels such as coal, oil, and natural gas will be exhausted day by day, and energy shortage and environmental pollution have become two major challenges facing mankind. Therefore, the research and development of clean and renewable energy is imminent. Hydrogen is considered to be the most promising energy carrier because of its high calorific value, cleanness and no pollution. The electrolysis of water to produce hydrogen has the characteristics of high efficiency and pure products, and is one of the important methods for industrial hydrogen production at present. However, the current electrode materials used for water electrolysis oft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C01B3/04
CPCY02E60/36
Inventor 李越湘李亚飞李辉彭绍琴
Owner NANCHANG UNIV
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