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Efficient oxygen evolution electrocatalyst and preparation method thereof

An electrocatalyst and oxygen evolution technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc.

Pending Publication Date: 2020-10-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large-scale development of efficient and economical OER electrocatalysts remains a daunting task.

Method used

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  • Efficient oxygen evolution electrocatalyst and preparation method thereof
  • Efficient oxygen evolution electrocatalyst and preparation method thereof
  • Efficient oxygen evolution electrocatalyst and preparation method thereof

Examples

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Embodiment 1

[0028] In this example, nickel foam (NF) was cut into a size of 2 cm × 3 cm × 1 mm. The preparation method of the high-efficiency oxygen evolution electrocatalyst in this example includes the synthesis of NiFe-LDH on NF and the synthesis of NiFe-LDH on NF 2 o 4 / NiFeP synthesis.

[0029] 1) Synthesis of NiFe-LDH on NF;

[0030] NiFe-LDH grown on NF was synthesized by hydrothermal method. NF was used after sequential ultrasonic cleaning in ethanol, deionized water, acetone, deionized water, HCl solution (pH 3) and deionized water for 15 minutes. First, 7.5 mmol urea and 0.375 mmol Fe(NO 3 ) 3 ∙9H 2O was dissolved in 30 mL deionized water and stirred for 3 h. The resulting solution was sonicated for 3 min and transferred to a 50 mL Teflon-lined stainless steel autoclave, and the cleaned NF was immersed in it. Then seal the autoclave, heat at 100° C. for 12 h, and cool to room temperature naturally after the reaction. Finally, it was washed three times in deionized water...

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Abstract

The invention discloses an efficient oxygen evolution electrocatalyst, which comprises a foamed nickel substrate, and a ferronickel-based oxide / phosphide with a heterostructure, wherein NiFe-LDH growson the foamed nickel matrix, and thermal phosphorylation is conducted to obtain the ferronickel-based oxide / phosphide with the heterostructure. According to the invention, heterogeneous NiFe2O4 / NiFePnanosheet is prepared on NF, wherein the optimal NiFe2O4 / NiFeP heterostructure can achieve stable performance in KOH with the concentration of 1 mol / L, and the anode current density of 10 mA cm<-2> can be generated only through the extremely low overpotential of 191 mV; the excellent OER activity of the NiFe2O4 / NiFeP heterostructure can be attributed to: a 3D network structure having a good structure and composed of vertically staggered nanosheets having a large exposed surface area; and the synergistic effect between NiFe2O4 and NiFeP produces an optimal electron structure that facilitates charge separation and reduces the energy barrier of the OER process.

Description

technical field [0001] The invention relates to a catalyst for preparing hydrogen, in particular to a high-efficiency oxygen evolution electrocatalyst and a preparation method thereof. Background technique [0002] With the growing demand for green energy, various efforts have been made to find and develop renewable and alternative energy sources. Hydrogen is an ideal alternative energy source, which has the advantages of high energy, non-toxic, non-polluting, and recyclable. The development of a hydrogen economy is a permanent strategic choice for humans to get rid of dependence on fossil energy, and electrocatalytic water splitting is widely considered to be a promising strategy for hydrogen production through electrical energy conversion. However, the oxygen evolution reaction (OER), as a half-reaction in the water splitting process, is kinetically a slow four-electron multi-step transfer process and thermodynamically an uphill process, thereby seriously affecting the ot...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCB01J27/1853C25B1/04B01J35/33Y02E60/36
Inventor 王新军李鑫
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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