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Metal boride water splitting catalyst, preparation method and application in electrocatalytic water splitting

A metal boride, electrocatalytic water technology, applied in the application, preparation, and high-efficiency metal boride water splitting catalyst field of electrocatalytic water splitting, can solve the limitation of large-scale production and application, reduce the overpotential of oxygen evolution reaction, accelerate Kinetic reaction and other problems, to achieve the effect of promoting commercial application, saving catalyst cost and low price

Active Publication Date: 2020-12-01
合肥动量守恒绿色能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of its slow kinetic reaction, the electrolysis efficiency of water is severely limited. A good catalyst can reduce the overpotential of the oxygen evolution reaction and accelerate its kinetic reaction.
At present, noble metal catalysts with excellent performance (RuO 2 , IrO 2 etc.) high cost and scarce reserves, which greatly limit its large-scale production and application

Method used

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  • Metal boride water splitting catalyst, preparation method and application in electrocatalytic water splitting
  • Metal boride water splitting catalyst, preparation method and application in electrocatalytic water splitting
  • Metal boride water splitting catalyst, preparation method and application in electrocatalytic water splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Experiment 1. Synthesis of metal boride water splitting catalyst with a molar ratio of metal to boron atom of 1:1 (MB)

[0042] (1) Weigh 8.1g (ie 0.75mol) of amorphous boron (B) and 0.9g (ie 0.0071mol) of potassium fluoroborate (KBF 4 ), fully grind and mix uniformly to obtain boronizing agent;

[0043] (2) Put 4 parts of the boronizing agent obtained in step (1) into 4 stainless steel tanks respectively, and then put 0.75mol of transition metals Fe, Co, Mo and W respectively, so that they are completely embedded in the boronizing agent middle;

[0044] (3) completely seal the stainless steel tank in step (2) with refractory mud, then fully dry under 100 ℃;

[0045] (4) The temperature of the stainless steel tank dried in step (3) was raised to 800° C. and calcined for 2 hours to obtain a metal boride water splitting catalyst with a molar ratio of metal to boron atoms of 1:1 (MB).

[0046] Experiment 2. The molar ratio of synthetic metal to boron atom is 2:1 (M 2 B...

Embodiment 2

[0063] Same as embodiment 1, just change the boriding medium into B 4 C, under the condition of 1M KOH, the electrocatalytic performance of the obtained sample:

[0064] Metal borides (MB) with a molar ratio of metal to boron atoms of 1:1: CoB, FeB, MoB, and WB at overpotentials of 361mV, 373mV, 431mV, and 459mV respectively, reaching a current density of 10mA cm -2 .

[0065] Metal borides (MB) with a 2:1 molar ratio of metal to boron atoms: Ni 2 B. Co. 2 B. Fe 2 B respectively at the overpotential of 345mV, 376mV, 409mV, the current density is 10mA cm -2 .

[0066] Metal borides (MB) with a 3:1 molar ratio of metal to boron atoms: Ni 3 B at an overpotential of 313mV, reaching a current density of 10mA cm -2 .

Embodiment 3

[0068] Same as embodiment 1, just change the boriding medium into NaB 4 o 7 , under the condition of 1M KOH, the electrocatalytic performance of the obtained sample:

[0069] Metal borides (MB) with a molar ratio of metal to boron atoms of 1:1: CoB, FeB, MoB, and WB at overpotentials of 364mV, 373mV, 429mV, and 463mV respectively, reaching a current density of 10mA cm -2 .

[0070] Metal borides (MB) with a 2:1 molar ratio of metal to boron atoms: Ni 2 B. Co. 2 B. Fe 2 B, when the overpotential is 348mV, 363mV, 403mV respectively, the current density is 10mA cm -2 .

[0071] Metal borides (MB) with a 3:1 molar ratio of metal to boron atoms: Ni 3 B at an overpotential of 312mV, reaching a current density of 10mA cm -2 .

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Abstract

Metal boride water splitting catalysts, preparation methods and applications in electrocatalytic water splitting belong to the technical field of electrocatalyst preparation. The metal boride catalyst of the present invention is prepared by a solid-phase boronizing method, using a solid boronizing agent to coat the transition metal, and performing boronizing treatment by programmed temperature heating. The boronizing agent consists of the necessary boronizing medium and optional activators and optional fillers. Compared with liquid boronization, the solid boronization method is less difficult to clean the surface after boronization, has low equipment requirements, and is suitable for the boronization treatment of various transition metals. The catalyst of the invention has excellent intrinsic catalytic activity and stability under alkaline conditions: the current density is 10mA cm ‑2 At this time, the required overpotential is 300mV ~ 400mV; and the stability of electrocatalytic water splitting and oxygen desorption can be as long as at least 100 hours, and the performance does not decay. It can replace precious metals and promote the commercial application of electrocatalytic water splitting.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst preparation, and specifically relates to a series of high-efficiency metal boride water splitting catalysts, a preparation method and an application in electrocatalytic water splitting. Background technique [0002] In the development and research of new energy, hydrogen has attracted wide attention due to its many advantages such as high combustion value, non-polluting products and diversified utilization forms. In the 21st century, China, the United States, Japan, Canada, the European Union and Australia have all formulated hydrogen energy development plans, and have made many progresses in this field. Among the currently developed renewable new energy production and storage technologies, energy conversion and storage devices such as electrochemical water splitting hydrogen production, fuel cells, and metal-air batteries are widely used due to their advantages such as high efficiency, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J23/75B01J23/755B01J23/28B01J23/30B01J35/00C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J23/28B01J23/30B01J23/745B01J23/75B01J23/755B01J35/33Y02E60/36
Inventor 邹晓新郭非凡吴园园李国栋李纪红
Owner 合肥动量守恒绿色能源有限公司
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