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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

The invention discloses a metal boride water-splitting catalyst, a preparation method and an application of the catalyst in electro-catalytic water splitting and belongs to the technical field of preparation of an electrocatalyst. The metal boride water-splitting catalyst is prepared with a solid-phase boriding method, transition metal is coated with a solid boriding agent, and boriding treatmentis performed through temperature programming heating. The boriding agent is prepared from a necessary boriding medium and an unnecessary filling agent. Compared with liquid boriding, a solid boridingmethod has the advantages that the surface clearing difficulty is low after boriding, requirements for equipment are low, and the method is applicable to boriding treatment of various transition metals. The catalyst has very good intrinsic catalysis activity and stability performance under the alkaline condition, and the required potential is 300-400 mV when the current density is 10 mA cm<-2>; the electro-catalytic water splitting oxygen evolution stability can be as long as at least 100 h while the performance is not attenuated, and the catalyst can replace noble metals to promote commercialapplication of electro-catalytic 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
CPCB01J23/28B01J23/30B01J23/745B01J23/75B01J23/755B01J35/0033C25B1/04C25B11/04Y02E60/36
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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