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Preparation method of carbon-coated transition metal phosphide composite material and application of carbon-coated transition metal phosphide composite material to oxygen evolution reaction

A transition metal, composite material technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrolysis processes, etc., can solve problems such as affecting electrocatalytic activity, flammability and toxicity, and achieve low price, good stability, and use. long life effect

Active Publication Date: 2017-04-05
BEIJING UNIV OF CHEM TECH
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

However, a high content of inactive species Al will be formed during the synthesis of phosphides using this method 2 o 3 , thereby affecting the electrocatalytic activity; and red phosphorus will be used as a phosphorus source, and white phosphorus gas will be generated during the roasting process, which is flammable and toxic

Method used

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  • Preparation method of carbon-coated transition metal phosphide composite material and application of carbon-coated transition metal phosphide composite material to oxygen evolution reaction
  • Preparation method of carbon-coated transition metal phosphide composite material and application of carbon-coated transition metal phosphide composite material to oxygen evolution reaction
  • Preparation method of carbon-coated transition metal phosphide composite material and application of carbon-coated transition metal phosphide composite material to oxygen evolution reaction

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Experimental program
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Effect test

Embodiment 1

[0026] A. Add 7.2mmol Co(NO 3 ) 2 ·6H 2 O. Add 24mmol urea into 200mL beaker a, add 150mL carbon dioxide-free water, and dissolve it by ultrasonic. Add 3.6mmol monododecyl phosphate (SDP) into 150mL beaker b, add 90mL carbon dioxide-free water, and ultrasonically dissolve. Add the solution in bottle b, which is evenly mixed and dispersed, into bottle a, protect it with an inert atmosphere, stir for a period of time, then transfer the solution in a to an autoclave, crystallize at 150°C for 6 hours, and use it repeatedly to remove carbon dioxide after crystallization Washing with water and ethanol and centrifugation to pH 7, followed by drying at 70 °C for 24 h yielded highly dispersed needle-like SDP-intercalated Co(OH) 2 Precursor (XRD, SEM picture see figure 1 and figure 2 );

[0027] B. Co(OH) intercalated with the highly dispersed acicular SDP prepared in step A 2 The precursor is placed in a high-temperature atmosphere furnace, and H 2 / Ar gas, the flow rate is 60...

Embodiment 2

[0034] Other conditions are the same as in Example 1, except that the inorganic metal salt is nickel nitrate hexahydrate. The electrocatalytic performance test results are summarized in Table 1.

Embodiment 3

[0036] Other conditions are the same as in Example 1, except that the inorganic metal salt is cobalt sulfate hexahydrate. The electrocatalytic performance test results are summarized in Table 1.

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Abstract

The invention provides a preparation method of a carbon-coated transition metal phosphide composite material and application of the carbon-coated transition metal phosphide composite material to the oxygen evolution reaction. Firstly, a pointed transition metal hydroxide precursor containing anion intercalations of a phosphorus source and a carbon source between layers is prepared through synthesis, and then the podiform carbon-coated transition metal phosphide composite material is obtained through high-temperature roasting. The composite material is applied to the positive pole reaction-oxygen evolution reaction of electrolysis of water, can effectively improve the performance of a catalyst, namely lowering the take-off potential and improving catalytic activity, and is long in service life and good in stability. Meanwhile, raw materials of the composite material are low in cost and have abundant reserves, the preparation method is simple, and environment friendliness is achieved. Under the alkaline condition of 0.1-1 M KOH, the overpotential required by the electric current density of 10 mA / cm<2> is 280-340 mV, and the Tafel slope is 60-80 mV / dec; and under the constant voltage of 1.65 V, the circulation time is as long as 1-24 hours or longer.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to the controlled preparation of carbon-coated transition metal phosphides by a special-morphology hydrotalcite-like intercalation precursor to form a pod-shaped composite material, which is applied to an oxygen evolution reaction catalyst electrode. Background technique [0002] With the increase of the earth's population and the rapid development of social economy, the demand for energy has become more tense. "Energy crisis" poses a challenge to the sustainable development of the ecological environment. Among them, traditional fossil energy (such as natural gas, coal, petroleum, etc.) is a non-renewable primary energy, which has low resource utilization efficiency and produces a large amount of harmful gases (such as greenhouse gas CO 2 , NO x , SO x Wait). New energy sources such as hydrogen energy, solar energy, and wind energy are clean, pollution-f...

Claims

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Application Information

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IPC IPC(8): B01J27/14B01J27/185C25B11/06C25B1/02
CPCC25B1/02B01J27/14B01J27/1853C25B11/091B01J35/00B01J35/30B01J35/33
Inventor 徐赛龙李婉张法智
Owner BEIJING UNIV OF CHEM TECH
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