Preparation method of carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode

A binder-free, three-dimensional porous technology, applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of unsuitable electrodes, slow carbon oxidation, catalyst deactivation, etc., and achieve improved stability and preparation methods The effect of simplicity and a wide range of raw materials

Inactive Publication Date: 2013-10-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow oxidation of carbon in a strong alkaline solution, the polymer binder will gradually degrade, resulting in catalyst deactivation
Therefore, electrodes prepared by traditional methods are not suitable for direct hydrogen peroxide fuel cell electrodes

Method used

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  • Preparation method of carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode
  • Preparation method of carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode
  • Preparation method of carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use nickel foam as the matrix in 2.0mol L -1 NH 4 Cl+0.1mol L -1 NiCl 2 In deposition solution, constant current -2.0A cm -2 , deposited for 100 seconds to obtain Ni / Ni-foam electrodes. at 1.0mol L -1 h 2 o 2 +3.0mol L -1 The catalytic performance of hydrogen peroxide electrooxidation was tested in KOH solution, and the oxidation current on the Ni / Ni-foam electrode was 783mAcm at a potential of 0.2V. -2 , much larger than blank nickel foam (357mA cm -2 ) and the oxidation current on the noble metal Pd electrode (580mA cm -2 ). DPPFC composed of Ni / Ni-foam as anode and Pd / CFC as cathode, in which the anolyte is 4.0mol L -1 KOH+1.0mol L -1 h 2 o 2 , the catholyte is 2.0mol L -1 h 2 SO 4 +2.0mol L -1 h 2 o 2 , the flow rate is 10mL min –1 , The test temperature is 20°C. The open circuit voltage of the battery is as high as 0.9V, and the peak power reaches 19.4mW cm -2 .

Embodiment 2

[0022] Use nickel foam as the matrix in 0.05mol L -1 NH 4 Cl+0.1mol L -1 CTAB+0.4mol L -1 CoSO 4In the deposition solution, a constant voltage of -3V was deposited for 90 seconds to obtain a Co / Ni-foam electrode. at 1.0mol L -1 h 2 o 2 +3.0mol L -1 The electrooxidation performance of hydrogen peroxide was tested in KOH solution, and it was found that the oxidation current on the Co / Ni-foam electrode was 470mA cm at a potential of 0.2V. -2 . DPPFC composed of Co / Ni-foam as anode and Pd / CFC as cathode, in which the anolyte is 4.0mol L -1 KOH+1.0mol L -1 h 2 o 2 , the catholyte is 2.0mol L -1 h 2 SO 4 +2.0mol L -1 h 2 o 2 , the flow rate is 10mL min –1 , The test temperature is 20°C. The open circuit voltage of the battery is as high as 0.88V, and the peak power reaches 16.7mW cm -2 .

Embodiment 3

[0024] Stainless steel wire (Stainless steel wire) as the matrix in 1.5mol L -1 KSCN+0.1mol L -1 PVP+0.15mol L -1 Cu(NO 3 ) 2 In the deposition solution, the upper limit potential of pulse potential electrodeposition is 0.5V, the lower limit potential is -2.5V, the frequency is 10Hz, and the deposition is 200 seconds to obtain a Cu / SSW electrode. at 1.0mol L -1 h 2 o 2 +3.0mol L -1 The electrooxidation performance of hydrogen peroxide was tested in KOH solution, and it was found that the oxidation current on the Cu / SSW electrode was 300mA cm at a potential of 0.2V -2 . DPPFC composed of prepared Cu / SSW as anode and Pd / CFC as cathode, in which the anolyte is 4.0mol L -1 KOH+1.0mol L -1 h 2 o 2 , the catholyte is 2.0mol L -1 h 2 SO 4 +2.0mol L -1 h 2 o 2 , the flow rate is 10mL min –1 , The test temperature is 20°C. The open circuit voltage of the battery is as high as 0.85V, and the peak power reaches 15.6mW cm -2 .

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Abstract

The invention provides a preparation method of a carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode. The preparation method comprises: a metal salt of Ni, Co or Cu and a surfactant are fully dissolved in pure water, so that the concentration of Ni<2+>, Co<2+> or Cu<2+> in the solution is 0.05 mol / L to 0.5 mol / L, and the concentration of the surfactant in the solution is 0 mol / L to 2.0 mol / L; a three-electrode system is formed by Ni foam or a stainless steel wire as a working electrode, a platinum electrode as a counter electrode and a silver-silver chloride electrode as a reference electrode; and with an electrochemical method, an active component choosing from Ni, Co or Cu is deposited on an Ni foam substrate or a stainless steel wire substrate to form the carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode, and the electro-deposition time is 5 s to 200 s. The method of the invention is simple, has strong operability, has wide sources of the raw materials, and can be widely applied to the preparation of a DPPFC (direct hydrogen dioxide fuel cell) anode.

Description

technical field [0001] The invention relates to a preparation method of an all-metal three-dimensional porous catalyst. Background technique [0002] Direct hydrogen peroxide fuel cell (DPPFC) is a new type of fuel cell that uses hydrogen peroxide as both fuel and oxidant. Since the products of the electro-oxidation and electro-reduction reactions of hydrogen peroxide are only water and oxygen, DPPFC is a truly "green and zero-carbon emission" power generation device. Recent studies have shown (Hydrogen peroxide as sustainable fuel: electrocatalysts for production with a solar cell and decomposition with a fuel cell, Chem.Commun.46(2010) 7334-7336.), using cobalt porphyrin as a catalyst, the use of solar cells can Efficiently remove O from the air 2 Reduction to H in acidic media 2 o 2 , the efficiency can reach 100%. Therefore, the use of solar energy to produce H 2 o 2 , using H 2 o 2 Fuel cell power generation will achieve true zero carbon emissions. In addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/66
CPCY02E60/10Y02E60/50
Inventor 曹殿学杨帆郭芬肖雪刘冉王贵领
Owner HARBIN ENG UNIV
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