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
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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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