Novel Co@CoP2/CF full-electrolysis water electrocatalyst

A catalyst, hydropower technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc.

Pending Publication Date: 2021-12-07
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the synergistic effect of the above factors to jointly promote the HER and OER performance of electrocatalysts.
Therefore, how to utilize the synergistic effect of high phosphorus content and Schottky effect to construct an electrocatalyst with efficient HER and OER dual functions is still a great challenge.

Method used

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  • Novel Co@CoP2/CF full-electrolysis water electrocatalyst
  • Novel Co@CoP2/CF full-electrolysis water electrocatalyst
  • Novel Co@CoP2/CF full-electrolysis water electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Set the area to 1×1cm 2 Foam copper (CF) sheet placed in 3mol L -1 Ultrasonic in the HCl solution for 20min, then ultrasonically cleaned with deionized water and absolute ethanol and dried;

[0020] (2) Take 2mmol Co(NO 3 ) 2 ·6H 2 O, 10mmol NH 4 F, 10mmol CH 4 N 2 O and 0.33mmol phytic acid were dissolved in deionized water to obtain a 20mL mixed solution;

[0021] (3) Transfer the CF pretreated in step (1) and the mixed solution prepared in step (2) to a reaction kettle, and conduct a hydrothermal reaction at 120°C for 8 hours. After it is naturally cooled to room temperature, it is centrifuged and separated with Wash with deionized water and absolute ethanol, and vacuum-dry the resulting precipitate;

[0022] (4) place the precipitate obtained in step (3) with a porcelain boat, and place it in a tube furnace, 2 Atmosphere, at 5°C·min -1 The heating rate was increased to 280°C, kept for 2 hours, and naturally cooled to room temperature to obtain the targ...

Embodiment 2

[0025] (1) Pretreat CF according to the method of step (1) in Example 1;

[0026] (2) Take 2mmol Co(NO 3 ) 2 ·6H 2 O, 10mmol NH 4 F, 10mmol CH 4 N 2 O, and 0.5mmol phytic acid were dissolved in deionized water to obtain a 20mL mixed solution;

[0027] (3) operate according to embodiment 1 step (3);

[0028] (4) operate according to embodiment 1 step (4), make target catalyst;

[0029](5) Hg / HgO, platinum wire and the prepared Co@CoP 2 / CF electrode is reference electrode, counter electrode and working electrode, at 1mol L -1 The HER, OER and total water splitting performance of the prepared samples were tested in the KOH electrolyte, and the results are shown in Figure 4(a~c). attached Figure 4 (a) and (b) show that at 1mol L -1 10mAcm in KOH solution -2 When the current density of Co@CoP 2 / CF catalyzes HER and OER with overpotentials of 65mV and 226mV, respectively. Figure (c) shows that Co@CoP 2 / CF||Co@CoP 2 The total water splitting system of / CF only nee...

Embodiment 3

[0031] (1) Pretreat CF according to the method of step (1) in Example 1;

[0032] (2) Take 2mmol Co(NO 3 ) 2 ·6H 2 O, 10mmol NH 4 F, 10mmol CH 4 N 2 O, and 0.2mmol phytic acid were dissolved in deionized water to obtain a 20mL mixed solution;

[0033] (3) operate according to embodiment 1 step (3);

[0034] (4) operate according to embodiment 1 step (4), make target catalyst;

[0035] (5) Hg / HgO, platinum wire and the prepared Co@CoP 2 / CF electrode is reference electrode, counter electrode and working electrode, at 1mol L -1 The HER, OER and total water splitting performance of the prepared samples were tested in the KOH electrolyte, and the results are shown in Figure 5(a-c). attached Figure 5 (a) and (b) show that at 1mol L -1 10mAcm in KOH solution -2 When the current density of Co@CoP 2 / CF catalyzes HER and OER with overpotentials of 70mV and 244mV, respectively. Figure (c) shows that Co@CoP 2 / CF||Co@CoP 2 The total water splitting system of / CF only ne...

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Abstract

The invention discloses a novel Co@CoP2 / CF efficient electrocatalyst, and belongs to the technical field of semiconductor electrocatalysis. The preparation method comprises the steps of firstly, putting a clean foamy copper (CF) sheet and an aqueous solution of Co(NO3)2.6H2O with the concentration of 0.1 mol L <-1 >, NH4F with the concentration of 0.5 mol L <-1 >, CH4N2O with the concentration of 0.5 mol L <-1 > and phytic acid with the concentration of 0.01-0.025 mol L <-1 > into a reaction kettle, and carrying out hydrothermal reaction at the temperature of 120 DEG C for 8 hours to prepare an intermediate product growing on the foamy copper (CF) in situ; and calcining the obtained intermediate product in an Ar / H2 atmosphere at the temperature of 280 DEG C for 2 hours to obtain the Co@CoP2 / CF high-efficiency electrocatalyst with the flower-like microsphere morphology and the Schottky heterostructure. When the electrocatalyst reaches the current density of 10 mA cm <-2 > in a 1 mol.L <-1 > KOH solution, the catalytic HER overpotential and the catalytic OER overpotential are only 55-70 mV and 210-244mV respectively, and a Co@CoP2 / CFCo@CoP2 / CF full-electrolysis water system only needs the voltage of 1.54-1.56 V to reach the current density of 10 mA cm <-2 >.

Description

technical field [0001] The invention belongs to the technical field of semiconductor electrocatalysis, and specifically relates to a novel Co@CoP 2 / CF total water splitting electrocatalyst. Background technique [0002] Population explosion and rapid economic development lead to global energy crisis and environmental pollution, so it is of great significance to develop clean and renewable energy. Compared with typical renewable and intermittent energy sources such as wind energy and solar energy, electrocatalytic water splitting technology is one of the most promising sustainable energy production technologies. However, the high overpotential and sluggish kinetics of the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) limit the further development of electrocatalytic total water splitting technology, which makes the development of new high-efficiency electrocatalysts attract extensive attention. . [0003] As benchmark electrocatalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04B82Y40/00
CPCC25B11/091C25B1/04B82Y40/00Y02E60/36
Inventor 李镇江孙永开孙文远孟阿兰
Owner QINGDAO UNIV OF SCI & TECH
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