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Water-soluble fast reaction kinetics couple-based photoelectrochemical energy storage battery

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: 2017-01-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Water-soluble fast reaction kinetics couple-based photoelectrochemical energy storage battery

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Embodiment 1

[0044] 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 2 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. image 3 Given the photoanode at 0.2mol / L HBr+1.0mol / L H 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.

[0045] In...

Embodiment 2

[0048] 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 in (a), in which 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...

Embodiment 3

[0055] 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 1 The static photoelectrochemical energy storage battery shown in (b), wherein the composition of the positive electrode electrolyte is 1.0mol / L HBr+1.0mol / LH 2 SO 4 , the composition of negative electrode electrolyte is 0.5mol / L H 4 [SiW 12 o 40 ]+1.0mol / LH 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 Il...

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Abstract

The invention provides a water-soluble fast reaction kinetics couple-based photoelectrochemical energy storage battery. When the battery is charged, in-situ transformation of light energy into chemical energy is achieved by using photoelectrochemical reaction driven by self-bias of narrow band gap photoelectrodes and the chemical energy is stored into an active material of a battery electrolyte; and when the battery is discharged, electrochemical reaction is carried out, thereby achieving transformation of the chemical energy into electric energy. The photoelectrochemical energy storage battery integrates a photoelectrochemical battery and a flow battery; the disadvantage that a solar cell cannot achieve electric energy storage is overcome; meanwhile, a single charging mode of the energy storage battery is also expanded; and solar energy in-situ transformation, storage and controllable utilization without assistance of external bias are achieved. Water-soluble fast reaction kinetics redox couples are adopted as the active material; the utilization rate of photo-induced carriers on the surfaces of photoelectrodes is close to 100%; meanwhile, the discharge power density of the battery can reach 0.5W / cm<2>; large-scale amplification can be achieved; and the photoelectrochemical energy storage battery is suitable for different scales of solar energy-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 Applications(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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