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Carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and preparation method of carbon-supported transition metal phosphide electrocatalyst

A technology of transition metals and electrocatalysts, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, electrodes, etc., can solve the problems of poor charge transport and stability, complicated preparation process, low industrial adaptability, etc., and achieve high conductivity , good electrical conductivity, simple and easy preparation method

Inactive Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon-supported metal phosphides prepared by these methods have weaker bonding between the carbon material and the catalyst, and relatively poor charge transport and stability. In addition, these preparation processes are more complicated, the cost is higher, the industrial adaptability is lower, and the preparation potential is relatively low. also small

Method used

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  • Carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and preparation method of carbon-supported transition metal phosphide electrocatalyst
  • Carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and preparation method of carbon-supported transition metal phosphide electrocatalyst
  • Carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and preparation method of carbon-supported transition metal phosphide electrocatalyst

Examples

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Embodiment 1

[0030] This embodiment illustrates the preparation of carbon-supported iron phosphide (FeP / Fe@NC) catalyst and the control example of heat treatment temperature (T):

[0031] Adopt ferric ammonium citrate and dicyandiamide as raw material, according to dicyandiamide: the mass ratio of ferric ammonium citrate=8:1 feeds intake, 8.0g dicyandiamide and 1.0g ferric ammonium citrate are dispersed in deionized water, in Stir in a water bath, evaporate to dryness, and grind to obtain a mixed powder. Next, put the mixed powder into a quartz tube, heat it to 600, 625, 650, 665, 680, and 700°C in an argon atmosphere at a heating rate of 10°C / min, react for 2 hours, and cool down to room temperature naturally to obtain a A series of iron-containing carbon precursors (Fe / Fe@NC-T-8) at different heat treatment temperatures;

[0032] Mix the prepared precursor and sodium hypophosphite at the ratio of Fe:P=1:5 (atomic ratio), grind them evenly, put them into a tube furnace and perform phosph...

Embodiment 2

[0037]This embodiment illustrates the control example of the reactant ratio (X) prepared by carbon-supported iron phosphide (FeP / Fe@NC) catalyst:

[0038] Ferric ammonium citrate and dicyandiamide are used as raw materials, and the feeding ratio of the two is adjusted to dicyandiamide: ferric ammonium citrate=4:1, 6:1, 8:1, 10:1 (mass ratio). The feeding amount of fixed dicyandiamide was 8.0g, and the corresponding mass of ferric ammonium citrate was added, and then the mixture was dispersed in deionized water, stirred and evaporated to dryness in a water bath, and mixed powder was obtained after grinding. Next, put the mixed powder into a quartz tube, heat up to 650°C at a rate of 10°C / min in an argon atmosphere, and cool down to room temperature naturally to obtain a series of iron-containing carbon precursors with different reactant ratios (Fe / Fe@NC-650-X);

[0039] Mix the prepared precursor and sodium hypophosphite at the ratio of Fe:P=1:5 (atomic ratio), grind them eve...

Embodiment 3

[0042] This embodiment illustrates the preparation of carbon-supported cobalt phosphide (CoP / Co@NC) catalyst and the control example of heat treatment temperature (T):

[0043] Adopting cobalt acetate and dicyandiamide as raw material, according to dicyandiamide: the mass ratio of cobalt acetate=8:1 feeds intake, 8.0g dicyanamide and 1.0g cobalt acetate are dispersed in deionized water, stirred and evaporated to dryness in a water bath, Grind to obtain a mixed powder. Next, put the mixed powder into a quartz tube, raise the temperature to 650, 680, and 700°C at a rate of 10°C / min in an argon atmosphere, and cool down to room temperature naturally to obtain a cobalt-containing carbon precursor (Co / Co@ NC-T-8);

[0044] Mix the prepared precursor and sodium hypophosphite in the ratio of Co:P=1:5 (atomic ratio), grind them evenly, put them into a tube furnace and perform phosphating treatment in an argon atmosphere at 5°C / min The heating rate was raised to 500 °C and kept for 2...

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Abstract

The invention relates to a carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and a preparation method of the electrocatalyst. A carbon-supported metal precursor is prepared through in-situ growth by using a transition metal-catalyzed carbon material, then phosphorization is conducted on the metal precursor so as to obtain the carbon-supported transition metal phosphide electrocatalyst for hydrogen generation. In the electrochemical hydrogen generation reaction, only overpotentials of 49 and 130 mV are required by the prepared carbon-supported iron phosphide (FeP / Fe@NC) when the current density is 10 and 100 mA / cm<2>, and meanwhile the catalyst has excellent stability without deactivation for 90 hours or above at a current density of 10 mA / cm<2>. The preparation method is simple and easy, the required raw materials are cheap and easily available, and high binding between the catalyst and the carbon carrier and excellent dispersibility of the catalyst can be ensured, so that the catalyst has good conductivity and electron transport characteristics.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a carbon-supported transition metal phosphide hydrogen-producing electrocatalyst and a preparation method thereof in the process of electrocatalytic water decomposition and hydrogen sulfide hydrogen production. Background technique [0002] As a clean energy with high energy density, hydrogen energy can be produced by electrocatalytic decomposition of water and hydrogen sulfide. Among them, the best-performing electrocatalysts for hydrogen production reactions are noble metals such as Pt, however, their low reserves and high price limit their large-scale use, so many studies are devoted to the development of inexpensive non-noble metal hydrogen production electrocatalysts. Metal phosphides have received extensive research and attention due to their low cost and high activity. Combining them with carbon materials to form carbon-supported metal phosphides will further ...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCY02E60/36
Inventor 李灿王小梅宗旭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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