A photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetic pair

A photoelectrochemical and energy storage battery technology, applied in solar cells, electrochemical generators, circuits, etc., can solve the problems of low battery discharge power, low solar energy conversion rate, and high electrode cost, so as to improve utilization and capture. efficiency, the effect of reducing the activation energy of the reaction

Active Publication Date: 2019-04-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problems to be solved by the present invention are: the limited redox pair selectivity in existing photoelectrochemical energy storage batteries, the limited photosensitive materials in DSSC, the high cost of organic electrolytes and low ion conductivity, and the LiSICON diaphragm causing internal damage to the battery. In view of the problems of high resistance, high cost of the counter electrode, low discharge power of the battery, and low final solar conversion rate, develop a photoelectrochemical energy storage battery with high efficiency, high storage capacity, high discharge power, and low cost.

Method used

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  • A photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetic pair
  • A photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetic pair
  • A photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetic pair

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Embodiment 1

[0050] In this example, Pt-modified and modified n-Si is used as the photoanode, and AM 1.5G 100mW / cm 2 As the light source, the photoanode was investigated at 0.2mol / L HBr+1.0mol / L H 2 SO 4 PEC activity in solution, as Figure 8 As shown, the obtained photocurrent is as high as 34mA / cm 2 , The conversion rate of solar energy to chemical energy in the PEC bromine oxidation process is 11.5%. In the PEC reaction, H 2 o 2 It is often used as a probe molecule to measure the utilization rate of photogenerated carriers on the surface of the photoelectrode. Figure 9 The photoanode is given at 0.2mol / L HBr+1.0mol / LH 2 SO 4 and 0.2mol / L H 2 o 2 +1.0mol / L H 2 SO 4 The ratio of the photocurrent at different potentials in the solution, the ratio of the two in the test potential range JHBr / JH 2 o 2 Both are higher than 1, indicating that the utilization rate of the photogenerated carriers on the surface of the photoanode is almost 100% in the solution containing HBr.

[0051] ...

Embodiment 2

[0054] In this embodiment, a single-junction amorphous silicon film is used as a photocathode, and catechol-4-sulfonic acid (BQ4SH 2 ) as the positive electrode active material, 9,10-anthraquinone-2-sulfonic acid (AQ2S) as the negative electrode active material, and carbon cloth as the positive electrode and the counter electrode in the negative electrode chamber. figure 1 The static photoelectrochemical energy storage battery shown, wherein the composition of the positive electrode electrolyte is 0.001mol / LBQ4SH 2 +1.0mol / L H 2 SO 4 , the composition of negative electrode electrolyte is 0.001mol / L AQ2S+1.0mol / L H 2 SO 4 , The positive and negative electrolytes are separated by nafion 117 membrane. Light charging process, using AM 1.5G 100mW / cm 2 The light intensity was used to illuminate, and the photocathode was connected to the carbon cloth counter electrode in the positive chamber. No external bias was applied during the charging process, and the charging time was 10 ...

Embodiment 3

[0061] In this embodiment, n-GaAs is used as the photoanode, the amorphous silicon film is used as the photocathode, HBr is used as the positive electrode active material, and silicotungstic acid (H 4 [SiW 12 o 40 ]) as the negative active material, with multi-walled carbon nanotubes as the counter electrode in the positive and negative chambers, construct such figure 2 The static photoelectrochemical energy storage battery shown, wherein the composition of the positive electrode electrolyte is 1.0mol / L HBr+1.0mol / L H 2 SO 4 , the composition of negative electrode electrolyte is 0.5mol / L H 4 [SiW 12 o 40 ]+1.0mol / L H 2 SO 4 , the positive and negative electrolytes are separated by nafion 115 membrane; the surface of the photoanode is modified with Pt co-catalyst, and the effective area is 0.35cm 2 ; The surface of the photocathode is modified with a carbon layer co-catalyst, and the effective area is 0.3cm 2 . Light charging process, using AM 1.5G 100mW / cm 2 Illumi...

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Abstract

The invention provides a photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetics redox couple. When the battery is charged, the photoelectrochemical reaction (Photoelectrochemical Reaction) driven by the self-bias of the narrow bandgap photoelectrode is used to realize the photoelectric energy storage battery. When the battery is discharged, an electrochemical reaction occurs to convert chemical energy into electrical energy. The invention integrates the photoelectrochemical battery and the liquid flow battery, overcomes the deficiency that the solar battery cannot realize electric energy storage, and at the same time broadens the single charging mode of the energy storage battery, and realizes the in-situ conversion of solar energy without external bias assistance, Storage and controllable utilization; water-soluble redox couples with fast reaction kinetics are used as active materials, the utilization rate of photogenerated carriers on the surface of the photoelectrode is close to 100%, and the discharge power density of the battery can be as high as 0.5W / cm 2 ; It can be scaled up and is suitable for different scales of solar-energy storage-power generation processes.

Description

technical field [0001] The invention relates to a photoelectrochemical energy storage battery based on a water-soluble fast reaction kinetics redox pair, more specifically, a photoelectrochemical energy storage battery that couples a photoelectrochemical battery with a flow battery, and belongs to the photoelectrochemical energy storage battery. The intersection of batteries and flow batteries. Background technique [0002] In the traditional photovoltaic power generation system, the solar cell is equivalent to a light energy converter, which only involves energy conversion, cannot realize the storage of electric energy, and cannot output energy when there is no sunlight. At present, the photovoltaic power generation system realizes the storage of electric energy by attaching a secondary battery to the outside of the solar cell. The system is mainly composed of photovoltaic arrays, controllers, secondary battery packs, inverters and other equipment. However, the system invo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M14/00
CPCH01M14/005
Inventor 李灿陈剑廖世潮施晶莹宗旭董延宝
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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