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Nickel-based catalyst for improving performance of direct borohydride fuel cell

A nickel-based catalyst and fuel cell technology, applied in the field of electrochemical applications, can solve the problems of low fuel discharge efficiency, low direct oxidation performance, large electrode reaction charge transfer resistance, etc., to improve discharge efficiency, enhance direct oxidation performance, The effect of increasing catalytically active sites

Inactive Publication Date: 2015-11-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when Ni is used as an anode catalyst in the prior art, because Ni is extremely corrosive in an alkaline environment, the charge transfer resistance of the electrode reaction is large, and the BH 4 - The direct oxidation performance is not high, and the fuel discharge efficiency is low

Method used

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  • Nickel-based catalyst for improving performance of direct borohydride fuel cell

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Experimental program
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Effect test

Embodiment 1

[0020] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, and the configuration is 0.2mol / dm 3 NiSO 4 solution. 2cm 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 silver / silver chloride electrode as the reference electrode, Ni is deposited on the metal nickel sheet 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 2mol / dm 3 In sodium hydroxide (NaOH) solution, make 0.27mol / dm 3 NaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. 2cm 2 The Ni catalyst and deposited Ni catalyst were 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. Linear potential sweep (LSV) was used for performance testing.

[0021] The Ni catalyst prepared by...

Embodiment 2

[0025] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, and the configuration is 0.2mol / dm 3 NiSO 4 solution. 2cm 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 silver / silver chloride electrode as the reference electrode, Ni is deposited on the metal nickel sheet by the constant potential (-0.8V) method. into a nickel-based catalyst. Weigh an appropriate amount of NaBH 4 , and dissolve it at 2mol / dm 3 In the NaOH solution, make 0.27mol / dm 3 NaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. 2cm 2 The Ni catalyst and deposited Ni catalyst were 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. Cyclic voltammetry was used for performance testing.

[0026] Figure 6 is BH under the action of Ni catalyst 4 - Multiple cyclic vo...

Embodiment 3

[0028] Under normal pressure, the temperature is in the range of 293.15 ~ 313.15K, and the configuration is 0.2mol / dm3 NiSO 4 solution. 2cm 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 silver / silver chloride electrode as the reference electrode, Ni is deposited on the metal nickel sheet by the constant potential (-0.8V) method. into a nickel-based catalyst. Weigh an appropriate amount of NaBH 4 , and dissolve it at 2mol / dm 3 In the NaOH solution, make 0.27mol / dm 3 NaBH 4 solution, mixed well as direct NaBH 4 Electrolyte for fuel cells. 2cm 2 The Ni catalyst and the deposited Ni catalyst are used as working electrodes, 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.

[0029] Figure 8 is BH under the action of different catalysts 4 - AC...

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Abstract

A nickel-based catalyst for improving the performance of a direct borohydride fuel cell is characterized in that the catalyst is prepared according to the following simple method of: (1) preparing a NiSO4 solution of 0.2 mol / dm<3> at a normal pressure and a temperature ranging from 293.15K to 313.15K; (2) assembling a three-electrode system, namely placing a smooth Ni sheet (serving as a working electrode) of 2 square meters in the above solution, wherein the Ni sheet is taken as a counter electrode, and a silver / silver chloride electrode is taken as a reference electrode; and (3) depositing Ni on a metal nickel sheet to prepare the nickel-based catalyst by using a constant potential (-0.8V) method. The surface morphology of the catalyst is changed due to deposition of the Ni, the specific surface area is obviously increased, catalytic active sites are greatly increased, and thus, the direct oxidizability of BH4<-> is enhanced; and meanwhile, the charge transfer resistance of electrode reaction is further reduced due to the deposition of the Ni, and fuel discharging efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the field of electrochemical applications, in particular to a nickel-based catalyst for improving the performance of a direct boron-hydrogen fuel cell. Background technique [0002] Currently, noble metal catalysts such as Pt, Ag, Pd, and Au are usually used to improve the performance of direct borohydrogen fuel cells. Since these metal catalysts are expensive, cheap metals such as Ni are also used as anode catalysts in borohydrogen fuel cells. However, when Ni is used as an anode catalyst in the prior art, because Ni is extremely corrosive in an alkaline environment, the charge transfer resistance of the electrode reaction is large, and the BH 4 - The direct oxidation performance is not high, and the fuel discharge efficiency is low. Contents of the invention [0003] Purpose of the present invention is exactly in order to overcome above-mentioned deficiencies in the prior art, a kind of nickel base catalyst that improves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/8853H01M4/925Y02E60/50
Inventor 余丹梅邓维林陈昌国李黎程浩万慧
Owner CHONGQING UNIV
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