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Electrochemical lithium intercalation modification method for remarkably improving OER catalytic performance of RuO2 in acidity

A catalytic performance, electrochemical technology, applied in the field of electrocatalysis, can solve problems such as low stability and unsatisfactory catalytic activity

Active Publication Date: 2022-03-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2) Ru is over-oxidized to soluble RuO4 moieties in an acidic oxidizing environment, so many Ru-based electrocatalysts Due to the low stability under certain conditions, the development bottleneck of electrolyzed water is in an acidic environment, and the catalytic activity of RuO2 cannot meet the needs of practical applications due to the influence of its inherent structure.

Method used

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  • Electrochemical lithium intercalation modification method for remarkably improving OER catalytic performance of RuO2 in acidity
  • Electrochemical lithium intercalation modification method for remarkably improving OER catalytic performance of RuO2 in acidity
  • Electrochemical lithium intercalation modification method for remarkably improving OER catalytic performance of RuO2 in acidity

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Embodiment 1

[0037] refer to figure 1 Shown: by adding RuO 2 (80wt%), CNT (10wt%) and PVDF (10wt%) were uniformly mixed in a certain amount of N-methylpyrrolidone to obtain a uniform slurry, which was then coated on Cu foil and dried in an oven at 110°C for at least 12 hours, and further punched into small discs with a diameter of 12mm.

[0038] In a glove box filled with argon, the RuO 2 The electrodes were assembled into a 2032 button battery for electrochemical lithium intercalation (using RuO 2 electrode and a piece of lithium with a diameter of 15.6 mm as positive and negative electrodes).

[0039] At room temperature, we employ the rutile-structured RuO 2 As a positive electrode material for lithium-ion button batteries, it can be tested at 0.05C (1C=201.03mA g) within a certain period of time by the blue battery test system -1 ) rate discharge, so that RuO 2 Intercalation of lithium to varying degrees (RuO 2 +Li-xh, x=0, 2, 9, 12 and 16), corresponding to Li x RuO 2 The lit...

Embodiment 2

[0042] The present invention Li x RuO 2 Performance test methods and results such as image 3 shown, where:

[0043] Li x RuO 2 The electrochemical measurement at 0.5M H 2 SO 4 Performed on an electrolyte, standard three-electrode configuration controlled by an electrochemical workstation at room temperature. Catalyst-coated glassy carbon (GC) electrodes (diameter: 5 mm), Ag / AgCl electrodes, and carbon rods were used as working, reference, and counter electrodes, respectively. In a typical case, 4mg powder sample Li x RuO 2 Add to the mixed solution containing 200ul ethanol and 200ul Nafion aqueous solution (5vl%, ethanol is the solvent), ultrasonically disperse for 15 minutes to form uniform black ink. Linear sweep voltammetry (LSV) curves were performed with a typical voltage range of 0.8-1.6 V and a scan rate of 5 mV / s. Chronopotentiometry at 10mA cm -2 at a constant current for at least 70 hours.

[0044] All RuO 2 +Li-xh catalysts all exhibit excellent OER ac...

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Abstract

The invention belongs to the technical field of electrocatalysis, and particularly relates to an electrochemical lithium intercalation modification method for remarkably improving the OER catalytic performance of RuO2 in acidity. According to the invention, the LixRuO2 is successfully embedded into RuO2 crystal lattices through an electrochemical method, and a solid solution phase (LixRuO2) is formed. An OER electrocatalysis test result shows that the OER performance of RuO2 is obviously improved after lithium is embedded, particularly, the current density of Li0. 52RuO2 in a 0.5 M H2SO4 electrolyte reaches 10mA cm <-2 >, the Li0. 52RuO2 has an ultra-low overpotential of 156mV, and the current density is kept at 10mA cm <-2 > at a constant potential of 1.27 V and is not obviously attenuated within at least 70h.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a method for significantly improving RuO 2 Electrochemical lithium intercalation modification method for OER catalytic performance in acidic environment. Background technique [0002] In the past decades, in order to meet the ever-increasing energy demand, researchers have endeavored to adopt various strategies to develop promising renewable energy sources with high calorific value and pollution-free. Needless to say, proton exchange membrane (PEM) electrolysis of water has attracted extensive attention due to its sensitive system response, superior current density, and negligible gas exchange rate. In order to achieve sustainable energy development, hydrogen, with high calorific value and low pollution, is the most ideal product. The electrochemical water splitting process is realized by electrochemistry, including hydrogen evolution reaction (HER) and oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04H01M4/485H01M10/0525
CPCC25B11/091C25B1/04H01M4/485H01M10/0525Y02E60/10Y02E60/36Y02E60/50Y02P20/133
Inventor 李锴锴秦茵张统一
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL