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High-efficiency electrolytic water catalyst HRu4O8 microrod and preparation method thereof

A technology of micro-rods and water electrolysis, which is applied in chemical instruments and methods, water/sewage treatment equipment, water/sludge/sewage treatment, etc. The effect of excellent catalytic activity, excellent stability and excellent performance

Active Publication Date: 2017-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing electrocatalysts cannot show excellent catalytic performance and stability in both HER and OER, and provide a high-efficiency electrolytic water catalyst HRu 4 o 8 Microrod and its preparation method

Method used

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  • High-efficiency electrolytic water catalyst HRu4O8 microrod and preparation method thereof
  • High-efficiency electrolytic water catalyst HRu4O8 microrod and preparation method thereof
  • High-efficiency electrolytic water catalyst HRu4O8 microrod and preparation method thereof

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specific Embodiment approach 1

[0019] Specific implementation mode 1: In this implementation mode, a high-efficiency electrolytic water catalyst HRu 4 o 8 The atomic ratio of H:Ru:O in the microrods is 1:4:8, HRu 4 o 8 The diameter of the microrod is 1-10 μm, and the length is 5-100 μm.

[0020] The beneficial effect of this implementation mode:

[0021] 1. The HRu of this embodiment 4 o 8 Microrods are applied to HER and OER, and have excellent performance. A dual-functional electrocatalyst with excellent catalytic activity for HER and OER in alkaline electrolyte system is obtained, which can electrolyze water efficiently;

[0022] 2. The HRu of this embodiment 4 o 8 HER at 10mA / cm for microrods, commercial Pt / C in 1M KOH 2 The overpotentials are 50mV and 108mV (without IR correction), respectively, and the performance is much better than that of commercial Pt / C. HRu 4 o 8 Microrods, Commercial RuO 2 OER in 1M KOH at 10mA / cm 2 The overpotential at low temperature is only 300mV, 323mV (both wit...

specific Embodiment approach 2

[0024] Specific implementation mode 2: In this implementation mode, a high-efficiency electrolytic water catalyst HRu 4 o 8 The preparation method of microrod is carried out according to the following steps:

[0025] 1. RuO 2Preparation of nanoparticles: dissolving the ruthenium precursor and nitrate in water with a molar ratio of 1:(1-20), stirring until evenly mixed to obtain a mixed solution, the concentration of the ruthenium precursor in the mixed solution is 1-100g / L, dry the mixed solution to obtain a solid, then put the solid into a container, then keep it in an inert atmosphere at 200-400°C for 0.5-10h, then keep it at 400-700°C for 1-10h, take it out after cooling down , washed 3 to 10 times, and dried to obtain RuO 2 Nanoparticles;

[0026] 2. Preparation of ruthenate microrods: the RuO 2 Nanoparticles and carbonate or bicarbonate are mixed in a molar ratio (0.5-10):1, then put into a container, and then kept in an inert atmosphere at 300-1200°C for 2-30 hours...

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the ruthenium precursor in step one is RuCl 3 ·nH 2 O, Ru(acac) 3 、Ru 2 (CO) 6 Cl 4 、K 2 RuCl 5 ·nH 2 One or more of O and tris(2,2-bipyridyl)ruthenium chloride hexahydrate are mixed in any ratio. Others are the same as in the second embodiment.

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Abstract

The invention discloses a high-efficiency electrolytic water catalyst HRu4O8 microrod and a preparation method thereof. The invention aims to solve the problem that the conventional electrocatalyst cannot simultaneously present excellent catalytic performance and stability on HER and OER. According to the HRu4O8 microrod disclosed by the invention, an atomic ratio of H to Ru to O is 1:4:8, and the HRu4O8 microrod has the diameter of 1-10 microns and the length of 5-100 microns. The preparation method comprises the following steps: 1, preparing RuO2 nanoparticles; 2, preparing a ruthenate microrod; 3, preparing the HRu4O8 microrod. The HRu4O8 microrod prepared by the invention can be applied to the HER and OER and is excellent in performance and stability. The high-efficiency electrolytic water catalyst HRu4O8 microrod and the preparation method disclosed by the invention are applied to the field of electro-catalysis.

Description

technical field [0001] The invention relates to a high-efficiency electrolytic water catalyst HRu 4 o 8 Microrods and methods for their preparation. Background technique [0002] As an energy carrier, hydrogen has the advantages of abundant sources, high calorific value and no pollution, and is considered to be an ideal choice to replace non-renewable fossil fuels. Alkaline electrolyzed water has attracted widespread attention because of its environmental friendliness, low equipment requirements, stable output, and high safety. Electrolysis of water includes two half-reactions of hydrogen production (HER) and oxygen production (OER). Pt is considered to be the best HER catalyst, but Pt is expensive, and its activity and stability in alkaline solution are poor, which seriously limit its wide application; RuO 2 It is considered to be one of the best OER catalysts, but its performance is seriously attenuated, and OER is a four-electron process with slow kinetics and high ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C25B1/04C25B11/06C02F1/461
CPCC25B1/04C25B11/04C02F1/46109B01J23/462C02F2001/46133C02F2201/46105B01J35/33Y02E60/36
Inventor 杜春雨王雅静尹鸽平韩国康孙雍荣钱正义高云智左朋建程新群马玉林
Owner HARBIN INST OF TECH
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