Additive for improving nickel anode catalyst performance of direct borohydride fuel cell

A fuel cell and nickel-based catalyst technology, applied in the field of electrochemical applications, can solve problems such as loss of catalytic activity, easy corrosion, and high resistance to charge transfer in electrode reactions

Inactive Publication Date: 2016-08-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when Ni-based is used as an anode catalyst in the prior art, Ni is easily corroded in an alkaline environment and loses its catalytic activity, resulting in BH 4 - The electrochemical reaction impedance during

Method used

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  • Additive for improving nickel anode catalyst performance of direct borohydride fuel cell
  • Additive for improving nickel anode catalyst performance of direct borohydride fuel cell
  • Additive for improving nickel anode catalyst performance of direct borohydride fuel cell

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Experimental program
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Effect test

Embodiment 1

[0017] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, with 0.2mol / L NiSO 4 solution. will be 2.0cm 2 The smooth Ni sheet (as the working electrode) is placed in the above solution, the smooth Ni sheet is used as the counter electrode, and the calomel electrode is used as the reference electrode, and the metal nickel is deposited on the Ni sheet electrode by the constant potential (-0.8V) method. into a nickel-based catalyst. Weigh an appropriate amount of sodium borohydride (NaBH 4 ), and dissolve it in 2.0mol / L sodium hydroxide (NaOH) solution to make 0.27mol / LNaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. Configure 0.045mol / L thiourea solution, then take 1mL of prepared thiourea solution and dilute it 5 times to make the concentration of thiourea solution 0.009mol / L. Measure 30mL of electrolyte solution, add 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1μL thiourea solution to it, 2 The nickel-based cata...

Embodiment 2

[0023] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, with 0.2mol / L NiSO 4 solution. will be 2.0cm 2 The smooth Ni sheet (as the working electrode) is placed in the above solution, with the smooth Ni sheet as the counter electrode and the calomel electrode as the reference electrode, the metal nickel is deposited on the Ni sheet by the constant potential (-0.8V) method to make nickel base catalyst. Weigh an appropriate amount of NaBH 4 , and dissolve it in 2.0mol / L NaOH solution to make 0.27mol / LNaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. Add 0.21μmol / L thiourea to the electrolyte solution, at 2.0cm 2 The nickel-based catalyst is used as the working electrode, the mercury / mercury oxide electrode is used as the reference electrode, and the graphite rod is used as the auxiliary electrode, and the AC impedance spectroscopy performance test is performed.

[0024] Figure 6 is BH before and after adding thiourea 4 ...

Embodiment 3

[0026] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, with 0.2mol / L NiSO 4 solution. will be 2.0cm 2 The smooth Ni sheet (as the working electrode) is placed in the above solution, with the Ni sheet as the counter electrode and the calomel electrode as the reference electrode, the metal nickel is deposited on the Ni sheet by the constant potential (-0.8V) method to form a nickel base catalyst. Weigh an appropriate amount of NaBH 4 , and dissolve it in 2.0mol / L NaOH solution to make 0.27mol / LNaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. Add 0.18μmol / L thiourea to the electrolyte solution, at 2.0cm 2 The deposited Ni catalyst was used as the working electrode, the mercury / mercury oxide electrode was used as the reference electrode, and the graphite rod was used as the auxiliary electrode, and the galvanostatic discharge performance test was performed.

[0027] Figure 7 is at a current density of 10mA / cm 2 Next, wi...

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Abstract

The invention relates to a thiourea (TU) additive for improving the nickel anode catalyst performance of a direct borohydride fuel cell .A preparation method of the additive comprises the following steps that at atmospheric pressure, on the condition that the temperature ranges from 293.15 K to 313.15 K, metal nickel is deposited on a Ni piece electrode through a constant electric potential (-0.8 V) method, and a prepared nickel-based catalyst serves as a nickel anode catalyst; a thiourea (TU) solution of 0.045 mol/L is prepared, 1 mL of the well-prepared thiourea solution is taken and diluted by five times to enable the concentration of the thiourea solution to be 0.009 mol/L, and the solution serves as an electrolyte additive .A hydrophobic thin film is formed on the surface of the nickel-based catalyst by means of thiourea (TU), the thin film changes distribution of BH4<-> on the surface of the nickel-based catalyst, and the BH4<-> electrochemical oxidation efficiency is improved .Shift of BH4<-> electrochemical oxidation peak potential is caused by addition of thiourea (TU), the electrochemical impedance of the system becomes smaller, the discharging efficiency becomes higher, the discharge potential is more negative, and the discharging time is longer.

Description

technical field [0001] The invention belongs to the field of electrochemical applications, and in particular relates to an additive for improving the performance of a nickel anode catalyst of a direct boron-hydrogen fuel cell. Background technique [0002] Currently, expensive metal catalysts such as Pt, Ag, Pd, and Au are usually used to improve the performance of nickel anode catalysts in direct boron-hydrogen fuel cells. To reduce the cost, Ni metal with catalytic ability has also been used as an anode catalyst for direct borohydrogen fuel cells. However, when Ni-based is used as an anode catalyst in the prior art, Ni is easily corroded in an alkaline environment and loses its catalytic activity, resulting in BH 4 - The electrochemical reaction impedance during direct oxidation is large, the charge transfer resistance of the electrode reaction is large, and the reaction rate is slow, BH 4 - The direct oxidation performance is not high, and the fuel discharge efficienc...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9041Y02E60/50
Inventor 余丹梅余小芳杜园园宋前通邓维林陈昌国
Owner CHONGQING UNIV
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