CN110386594B - Preparation method of nano porous iron phosphide cube - Google Patents

Preparation method of nano porous iron phosphide cube Download PDF

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CN110386594B
CN110386594B CN201910273089.1A CN201910273089A CN110386594B CN 110386594 B CN110386594 B CN 110386594B CN 201910273089 A CN201910273089 A CN 201910273089A CN 110386594 B CN110386594 B CN 110386594B
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cube
phosphide
electrolytic cell
iron phosphide
iron
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CN110386594A (en
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卢章辉
石景辉
郭满满
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Jiangxi Normal University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14Phosphorus; Compounds thereof
    • B01J27/185Phosphorus; Compounds thereof with iron group metals or platinum group metals
    • B01J27/1853Phosphorus; Compounds thereof with iron group metals or platinum group metals with iron, cobalt or nickel
    • B01J35/33
    • B01J35/60
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/08Other phosphides
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/04Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
    • C01B3/042Decomposition of water
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/70Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/80Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/01Particle morphology depicted by an image
    • C01P2004/03Particle morphology depicted by an image obtained by SEM
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/01Particle morphology depicted by an image
    • C01P2004/04Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Abstract

The invention provides a preparation method of a nano porous ferric phosphide cube. The nano porous iron phosphide cubic material is prepared by adopting a simple and effective method of electrodeposition before acid etching: taking a mixed solution of an iron source and a phosphorus source precursor as an electrolyte, taking carbon paper as a working electrode, arranging a reference electrode and a counter electrode in an electrolytic cell, transferring the electrolyte into the electrolytic cell for electrochemical deposition, and removing non-iron phosphide substances by using a sulfuric acid solution. The method has the advantages of simple process, low synthesis temperature, uniform size, high repeatability, high acid stability and the like, and particularly can avoid the generation of a large amount of PH in the traditional heat treatment phosphating process3The problem of gas. The nano porous iron phosphide cubic material prepared by the method has excellent performance in the aspect of electrochemical water decomposition hydrogen production, and is a material with great development prospect.

Description

Preparation method of nano porous iron phosphide cube
Technical Field
The invention belongs to the field of functional material synthesis, and particularly relates to a preparation method of a three-dimensional nano porous iron phosphide cube.
Background
The reduction of fossil fuels and the exacerbation of environmental crisis have attracted public attention over the last several decades. To solve these problems, the development and utilization of renewable energy have been imminent, and hydrogen energy becomes a very promising renewable energy source because of its high energy storage density and zero carbon emission. Electrochemical water splitting currently provides an efficient method for large-scale production of high-purity hydrogen, but requires an efficient and stable electrocatalyst to reduce the overpotential of the hydrogen evolution reaction. Currently, noble metals Pt, Ru and Pd are the most excellent electrocatalysts for hydrogen evolution reaction (angelw. chem. int. ed.2013,125,3192), but their wide application is severely limited by their low content and high cost in nature. For this reason, rational development of effective noble metal-free HER catalysts is of great importance for large-scale commercialization.
Transition metal phosphide materials can provide high current density at low overpotentials and faster reaction kinetics in hydrogen evolution reactions due to having phosphorus and metal as proton acceptor and hydride acceptor sites (j.am. chem. soc.2013,135, 9267). Meanwhile, iron is one of the most abundant (about 5% of the earth's crust) metals on earth, and is at least 2 orders of magnitude cheaper than the same class of transition metals (such as nickel and cobalt), which is beneficial for commercial mass production. In addition, the iron phosphide material with the three-dimensional porous nanostructure is designed and synthesized, so that the specific surface area of charge transfer is increased, and the efficiency of hydrogen evolution reaction is improved. Therefore, the development of the iron phosphide material with the porous structure has very important theoretical significance and practical value for the hydrogen evolution reaction.
Disclosure of Invention
The invention aims to provide a preparation method of a nano porous iron phosphide cube.
The nano porous iron phosphide cubic material is obtained by taking carbon paper as a substrate at room temperature and performing electrochemical deposition and acid etching in a mixed solution of an iron source and a phosphorus source precursor, and specifically comprises the following steps:
(1) preparing an electrolyte: adding a soluble iron source precursor and a phosphorus source precursor into water, and performing ultrasonic treatment to obtain an electrolyte solution;
(2) preparing an electrolytic cell: taking carbon paper as a working electrode, arranging a reference electrode and a counter electrode in an electrolytic cell at the same time, and transferring the electrolyte solution prepared in the step (1) into the electrolytic cell for electrochemical deposition;
(3) carrying out electrochemical deposition: in the electrolytic cell prepared in the step (2), a chronoamperometry method is selected, and electrochemical deposition is continuously carried out under the condition that the initial potential parameter is-0.95V;
(4) acid etching is used: and (4) soaking the carbon paper deposited in the step (3) in a sulfuric acid solution, and standing to obtain the nano porous ferric phosphide cube.
The iron source precursor in the step (1) is ferrous chloride tetrahydrate, ferrous nitrate hexahydrate or ferrous sulfate heptahydrate; the phosphorus source precursor is sodium hypophosphite.
The concentration of the iron source precursor in the mixed solution in the step (1) is 0.015-0.035M.
The concentration of the phosphorus source precursor in the mixed solution in the step (1) is 0.4-0.6M.
And (4) the electrochemical deposition time in the step (3) is 20-40 minutes.
The concentration of sulfuric acid in the sulfuric acid solution in the step (4) is 0.3-0.7M.
The nano porous iron phosphide cube prepared by the method can be used as a catalyst to participate in hydrogen evolution reaction.
The invention has the beneficial effects that: (1) the non-noble metal iron used in the preparation method is cheap and easy to obtain; (2) the preparation method has the advantages of simplicity, low synthesis temperature, uniform size, high repeatability, high acid stability and the like, avoids a phosphorization method of heat treatment, and greatly avoids the generation of toxic gas phosphine; (3) the prepared nano porous iron phosphide cubic material has a nano porous structure and a larger specific surface area, is rich in resources, low in cost and simple and convenient to prepare, has very excellent performance in the aspect of electrochemical water decomposition hydrogen production, and is a catalyst with a great development prospect.
Drawings
FIG. 1 is a scanning electron micrograph of a nanoporous iron phosphide cube obtained in example 1 of the present invention.
FIG. 2 is a transmission electron micrograph of a nanoporous iron phosphide cube obtained in example 1 of the present invention.
FIG. 3 is a high-resolution projection electron micrograph and a selected area electron diffraction pattern of a nanoporous iron phosphide cube obtained in example 1 of the present invention.
FIG. 4 is the element mapping and EDS energy spectra of the nanoporous iron phosphide cubes obtained in example 1 of the present invention.
FIG. 5 is a powder X-ray diffraction pattern of a nanoporous iron phosphide cube obtained in example 1 of the present invention.
FIG. 6 is a test chart of the performance of the nano-porous iron phosphide cube obtained in the example 1 of the invention in hydrogen production by electrolysis of water under acidic conditions and cyclic voltammetry stability.
Detailed Description
The present description will be further explained with reference to the drawings and specific examples.
Example 1:
(1) preparing an electrolyte: preparing a mixed solution of 0.025M ferrous sulfate heptahydrate and 0.5M sodium hypophosphite by taking 30mL of water as a solvent, and performing ultrasonic treatment for 5 minutes to obtain an electrolyte solution;
(2) preparing an electrolytic cell for the step (1): the carbon paper is used as a working electrode, a reference electrode and a counter electrode are arranged in an electrolytic cell at the same time, and the electrolyte is transferred to the electrolytic cell for electrochemical deposition;
(3) performing electrochemical deposition to the step (2): under the condition of 25 ℃, a chronoamperometry method is selected, the initial potential parameter is that electrochemical deposition is continuously carried out under minus 0.95V, and the deposition time is 30 minutes;
(4) acid etching is used for the step (3): and soaking the carbon paper after deposition in a 0.5M sulfuric acid solution, and standing for 5 minutes to obtain the nano porous ferric phosphide cube.
Example 2:
the ferrous sulfate heptahydrate obtained in the step (1) in the example 1 is changed into ferrous chloride tetrahydrate, and other steps are the same as those in the example 1, so that the nano-porous ferric phosphide cube is obtained.
Example 3:
the ferrous sulfate heptahydrate obtained in the step (1) in the example 1 is changed into ferrous nitrate hexahydrate, and other steps are the same as those in the example 1, so that the nano-porous ferric phosphide cube is obtained.
Example 4:
the concentration of ferrous sulfate heptahydrate in the step (1) in the example 1 was changed to 0.015M, and the other steps were the same as in the example 1, to obtain a nanoporous ferric phosphide cube.
Example 5:
the concentration of ferrous sulfate heptahydrate in the step (1) in the example 1 was changed to 0.035M, and the other steps were the same as in the example 1, to obtain a cubic nanoporous iron phosphide.
Example 6:
the concentration of sodium hypophosphite obtained in step (1) in example 1 was changed to 0.40M, and the other steps were the same as in example 1, to obtain a nanoporous iron phosphide cube.
Example 7:
the concentration of sodium hypophosphite obtained in step (1) in example 1 was changed to 0.60M, and the other steps were performed in the same manner as in example 1, to obtain a nanoporous iron phosphide cube.
Example 8:
the deposition time in the step (3) in the example 1 was changed to 20 minutes, and the other steps were the same as in the example 1, to obtain a nanoporous iron phosphide cube.
Example 9:
the deposition time in the step (3) in the example 1 was changed to 40 minutes, and the other steps were the same as in the example 1, to obtain a nanoporous iron phosphide cube.
Example 10:
the sulfuric acid concentration in the step (4) in example 1 was changed to 0.3M, and the other steps were the same as in example 1, to obtain a nanoporous iron phosphide cube.
Example 11:
the sulfuric acid concentration in the step (4) in example 1 was changed to 0.7M, and the other steps were the same as in example 1, to obtain a nanoporous iron phosphide cube.

Claims (3)

1. A preparation method of a nano-porous iron phosphide cube comprises the following steps:
(1) preparing an electrolyte: adding a soluble iron source precursor with the concentration of 0.015-0.035M and a phosphorus source precursor with the concentration of 0.4-0.6M into water, and performing ultrasonic treatment to obtain an electrolyte solution, wherein the iron source precursor is ferrous chloride tetrahydrate, ferrous nitrate hexahydrate or ferrous sulfate heptahydrate, and the phosphorus source precursor is sodium hypophosphite;
(2) preparing an electrolytic cell: taking carbon paper as a working electrode, arranging a reference electrode and a counter electrode in an electrolytic cell at the same time, and transferring the electrolyte solution prepared in the step (1) into the electrolytic cell for electrochemical deposition;
(3) carrying out electrochemical deposition: in the electrolytic cell prepared in the step (2), a chronoamperometry method is selected, and electrochemical deposition is continuously carried out for 20-40 minutes under the condition that the initial potential parameter is-0.95V;
(4) acid etching is used: and (4) soaking the carbon paper deposited in the step (3) in a sulfuric acid solution with the concentration of 0.3-0.7M, and standing to obtain the nano porous ferric phosphide cube.
2. A nanoporous iron phosphide cube produced by the method of claim 1.
3. Use of the nanoporous iron phosphide cube of claim 2 as a hydrogen evolution reaction catalyst.
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CN109136983A (en) * 2018-09-26 2019-01-04 太原理工大学 A kind of Mo/Ni/Co/P/C composite material and preparation method and application
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CN108807941A (en) * 2018-07-18 2018-11-13 江苏科技大学 The preparation method and application of iron phosphide nanometer sheet and biomass carbon composite material
CN109136983A (en) * 2018-09-26 2019-01-04 太原理工大学 A kind of Mo/Ni/Co/P/C composite material and preparation method and application
CN109261177A (en) * 2018-09-30 2019-01-25 温州大学 Nanoscale nickel phosphide/carbon cloth composite material and preparation method thereof and the application in elctro-catalyst
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