A double-beam photoelectrochemical test device

Abstract

The invention discloses a double-beam photoelectrochemical testing device, comprising an electrolytic system, a first light source, a second light source, a data acquisition device and a computer. The electrolytic system comprises an optical chopper, an electrolytic cell, a working electrode, a reference electrode, an auxiliary electrode and a constant potential instrument. The reference electrode, the auxiliary electrode and the working electrode are arranged in the electrolytic cell, the working electrode is located at the bottom of the electrolytic cell, the auxiliary electrode, the working electrode and the reference electrode are electrically connected to the constant potential instrument respectively, the bottom wall of the electrolytic cell is a light-transmitting wall, the optical chopper is placed between the electrolytic cell and the second light source, the first light source irradiates the lower surface of the working electrode upward, and the second light source irradiates the upper surface of the working electrode downward. By periodically irradiating the upper and lower surfaces of the photoelectrode in the electrolytic cell with two beams of light of different periods and different wavelengths at the same time, the accuracy of detecting the performance of different photoelectrodes can be improved. The invention can be applied to studying the reaction mechanism and the performance of photocatalysts in photoelectrochemical systems.

Description

Technical Field

[0001] The invention relates to the technical field of photoelectrochemical technology, and in particular to a double-beam photoelectrochemical testing device. Background Art

[0002] With the rapid development of social industry, fossil fuels currently supply more than 80% of the world's energy consumption. In addition to the problem of resource shortage caused by energy consumption, there is also a large amount of CO2 emissions that leads to serious environmental pollution. Energy crisis and environmental pollution are the dual challenges facing human society today. Solar energy is the most abundant clean energy available to humans. The energy reaching the earth per second is about 1.73X10 7 Watts, which is more than 10,000 times the energy consumed by all mankind.

[0003] Therefore, in recent decades, researchers from various countries have been committed to the research of environmentally friendly clean energy and to improving the utilization rate of solar energy, such as light reducing water or carbon dioxide to hydrogen and other clean energy through catalysts. Therefore, it is crucial to accurately judge whether a photocatalyst has good performance and clarify the photoelectrochemical process in it for the study of photoelectrochemical synthesis.

[0004] At present, most of the research work is to directly measure the current and photoelectrode potential of the entire photoelectrode by irradiating the photoelectrode with a single light beam. However, this test method has limitations in studying a photochemical system with a composite nanomaterial like Au-TiO2 as a photoelectrode. For example, the Au-TiO2 composite nanomaterial contains two substances, Au nanoparticles and TiO2 nanoparticles, respectively. However, Au nanoparticles only respond to visible light, while TiO2 nanoparticles only respond to ultraviolet light. Therefore, when studying the performance of this catalyst as a photoelectrode, it is extremely inaccurate to only use fluorescent light to study its photocurrent and photoelectrode potential. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-beam photoelectrochemical testing device to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] A double-beam photoelectrochemical testing device comprises an electrolysis system, a first light source, a second light source, a data acquisition device and a computer. The electrolysis system comprises an optical chopper, an electrolytic cell, a working electrode, a reference electrode, an auxiliary electrode and a potentiostat. The reference electrode, the working electrode and the auxiliary electrode are arranged in the electrolytic cell, the working electrode is located at the bottom of the electrolytic cell, the working electrode, the reference electrode and the auxiliary electrode are respectively connected to the potentiostat, the potentiostat is connected to an input end of the data acquisition device, and an output end of the data acquisition device is connected to a computer. The first light source is arranged below the electrolytic cell, the bottom wall of the electrolytic cell is a light-transmitting wall, the optical chopper is placed between the electrolytic cell and the second light source, the first light source irradiates the lower surface of the working electrode upwards, the second light source is arranged above the electrolytic cell, and the second light source irradiates the upper surface of the working electrode downwards.

[0008] As a further improvement of the above technical solution, the first light source is a visible monochromatic light source, and the second light source is an ultraviolet monochromatic light source.

[0009] As a further improvement of the above technical solution, a narrow wave pass filter is arranged between the visible monochromatic light source and the electrolytic cell to obtain a monochromatic light source.

[0010] As a further improvement of the above technical solution, the visible monochromatic light source is a xenon lamp.

[0011] As a further improvement of the above technical solution, it also includes an optical chopper, which is placed between the electrolytic cell and the ultraviolet monochromatic light source.

[0012] As a further improvement of the above technical solution, it also includes a rack and an optical fiber tube, the visible monochromatic light source, the electrolytic cell and the ultraviolet monochromatic light source are installed on the rack, the ultraviolet monochromatic light source includes an LED ultraviolet lamp installed on the rack, one end of the optical fiber tube is suspended directly above the LED ultraviolet lamp through a first bracket, the LED ultraviolet lamp irradiates one end face of the optical fiber tube upward, the optical chopper is arranged between the LED ultraviolet lamp and the one end face of the optical fiber tube, the other end of the optical fiber tube is suspended directly above the electrolytic cell through a second bracket, and the other end face of the optical fiber tube irradiates the electrolytic cell downward.

[0013] As a further improvement of the above technical solution, optical fiber collimators are installed at both ends of the optical fiber tube, and the optical chopper is placed between the optical fiber collimator near one end of the LED ultraviolet lamp and the LED ultraviolet lamp.

[0014] The beneficial effects of the present invention are as follows: during detection, the corresponding electrolyte is filled into the electrolytic cell, the working electrode, the auxiliary electrode and the reference electrode are immersed in the electrolyte, and the upper and lower surfaces of the photoelectrode in the electrolytic cell are periodically irradiated simultaneously by the first light source and the second light source of different periods and wavelengths. Specifically, the light emitted by the first light source illuminates the lower surface of the working electrode in the electrolytic cell through the light-transmitting wall, and the second light source illuminates the upper surface of the working electrode in the electrolytic cell downward, and simultaneously measures the corresponding changes of the photoelectrode current and the photoelectrode potential under different periods of illumination, thereby improving the accuracy of detecting different photoelectrode performances by irradiating with two beams of light of different wavelengths, and being able to better study the reaction mechanism in the photoelectrochemical system and better evaluate the performance of the photocatalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 It is a schematic structural diagram of the double-beam photoelectrochemical testing device of the present invention. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0021] Reference Figure 1 The present invention provides a dual-beam photoelectrochemical testing device as follows:

[0022] like Figure 1 As shown, a double-beam photoelectrochemical testing device includes an electrolysis system, a first light source, a second light source, a data acquisition device and a computer. The electrolysis system includes an optical chopper 100, an electrolytic cell 200, a working electrode 300, a reference electrode 400, an auxiliary electrode 900, and a constant potential instrument. The reference electrode 400, the working electrode 300 and the auxiliary electrode 900 are arranged in the electrolytic cell 200, the working electrode 300 is located at the bottom of the electrolytic cell 200, and the working electrode 300, the reference electrode 400 and the auxiliary electrode 900 are respectively connected to a constant potential meter, the constant potential meter is connected to the input end of a data acquisition device, the output end of the data acquisition device is connected to a computer, the first light source is arranged below the electrolytic cell 200, the bottom wall of the electrolytic cell 200 is a light-transmitting wall 210, the optical chopper 100 is placed between the electrolytic cell 200 and the second light source, the first light source irradiates the lower surface of the working electrode 300 upwards, the second light source is arranged above the electrolytic cell 200, and the second light source irradiates the upper surface of the working electrode 300 downwards.

[0023] During detection, the corresponding electrolyte is filled into the electrolytic cell 200, the working electrode 300, the auxiliary electrode 900 and the reference electrode 400 are immersed in the electrolyte, and the optical chopper 100 periodically blocks the light beam of the second light source to achieve illumination of the photoelectrode in different periods, and the first light source and the second light source of different periods and wavelengths are used to illuminate the upper and lower surfaces of the photoelectrode in the electrolytic cell 200 at the same time. Specifically, the light emitted by the first light source illuminates the lower surface of the working electrode 300 in the electrolytic cell 200 through the light-transmitting wall 210, and the second light source illuminates the upper surface of the working electrode 300 in the electrolytic cell 200 downward, and the photoelectrode current and photoelectrode potential are measured simultaneously, so that the accuracy of detecting different photoelectrode performances can be improved by irradiating with two beams of light of different wavelengths, so that the reaction mechanism in the photoelectrochemical system can be better studied and the performance of the photocatalyst can be better evaluated.

[0024] In some embodiments, the first light source is a visible monochromatic light source 500, the visible monochromatic light source 500 is a xenon lamp, and the second light source is an ultraviolet monochromatic light source.

[0025] In some embodiments, a narrow pass filter 510 is provided between the visible monochromatic light source 500 and the electrolytic cell 200 to obtain a monochromatic light source. The filter 510 is used to irradiate the photoelectrode with monochromatic light of different wavelengths.

[0026] In some embodiments, a rack 700 and an optical fiber tube 800 are also included. The visible monochromatic light source 500, the electrolytic cell 200 and the ultraviolet monochromatic light source are installed on the rack 700. The ultraviolet monochromatic light source includes an LED ultraviolet lamp 600 installed on the rack 700. One end of the optical fiber tube 800 is suspended directly above the LED ultraviolet lamp 600 through a first bracket 810. The LED ultraviolet lamp 600 irradiates one end surface of the optical fiber tube 800 upward. The optical chopper 100 is arranged between the LED ultraviolet lamp 600 and the one end surface of the optical fiber tube 800. The other end of the optical fiber tube 800 is suspended directly above the electrolytic cell 200 through a second bracket 820. The other end surface of the optical fiber tube 800 irradiates the electrolytic cell 200 downward. Optical fiber collimators 830 are installed at both ends of the optical fiber tube 800. The point light source is converted into a parallel light source through the optical fiber tube 800 and the optical fiber collimator 830 to uniformly irradiate the photoelectrode.

[0027] The operation steps of this technical solution are as follows:

[0028] Step 1: Fill the electrolytic cell 200 with corresponding electrolyte;

[0029] Step 2: Connect the working electrode 300, the reference electrode 400 and the auxiliary electrode 900 to a constant potential instrument, connect the constant potential instrument to the input end of a data acquisition device, and connect the output end of the data acquisition device to a computer;

[0030] Step 3: Turn on the potentiostat, the xenon lamp, the LED UV lamp 600 and the optical chopper 100, set the illumination period of different light beams, set the sampling speed and the total measurement time;

[0031] Step 4: After the measurement is completed, turn off the xenon lamp, the LED ultraviolet lamp 600, and the optical chopper 100, store the data, and unload the electrolytic cell 200.

[0032] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A dual-beam photoelectrochemical testing device, characterized in that: The invention comprises an electrolysis system, a first light source, a second light source, a data acquisition device and a computer. The electrolysis system comprises an optical chopper (100), an electrolysis cell (200), a working electrode (300), a reference electrode (400), an auxiliary electrode (900) and a constant potential instrument. The reference electrode (400), the working electrode (300) and the auxiliary electrode (900) are arranged in the electrolysis cell (200). The working electrode (300) is located at the bottom of the electrolysis cell (200). The working electrode (300), the reference electrode (400) and the auxiliary electrode (900) are arranged in the electrolysis cell (200). ) are respectively connected to a constant potential instrument, the constant potential instrument is connected to an input end of a data acquisition device, the output end of the data acquisition device is connected to a computer, the first light source is arranged below the electrolytic cell (200), the bottom wall of the electrolytic cell (200) is a light-transmitting wall (210), the optical chopper (100) is placed between the electrolytic cell (200) and the second light source, the first light source irradiates the lower surface of the working electrode (300) upwards, the second light source is arranged above the electrolytic cell (200), and the second light source irradiates the upper surface of the working electrode (300) downwards; During detection, a corresponding electrolyte is filled into the electrolytic cell (200), the working electrode (300), the auxiliary electrode (900) and the reference electrode (400) are immersed in the electrolyte, and illumination of the photoelectrode at different periods is achieved by periodically shielding the light beam of the second light source through the optical chopper (100), the light emitted by the first light source passes through the light-transmitting wall (210) to illuminate the lower surface of the working electrode (300) in the electrolytic cell (200), and the second light source illuminates the upper surface of the working electrode (300) in the electrolytic cell (200) downward, and the photoelectrode current and photoelectrode potential are measured simultaneously; The first light source is a visible monochromatic light source (500), and the second light source is an ultraviolet monochromatic light source; The optical chopper (100) is placed between the electrolytic cell (200) and the ultraviolet monochromatic light source; It also includes a frame (700) and an optical fiber tube (800), wherein the visible monochromatic light source (500), the electrolytic cell (200) and the ultraviolet monochromatic light source are mounted on the frame (700), wherein the ultraviolet monochromatic light source includes an LED ultraviolet lamp (600) mounted on the frame (700), wherein one end of the optical fiber tube (800) is suspended directly above the LED ultraviolet lamp (600) via a first bracket (810), wherein the LED ultraviolet lamp (600) irradiates one end face of the optical fiber tube (800) upward, wherein the optical chopper (100) is disposed between the LED ultraviolet lamp (600) and the one end face of the optical fiber tube (800), wherein the other end of the optical fiber tube (800) is suspended directly above the electrolytic cell (200) via a second bracket (820), wherein the other end face of the optical fiber tube (800) irradiates the electrolytic cell (200) downward; Optical fiber collimators (830) are installed at both ends of the optical fiber tube (800), and the optical chopper (100) is placed between the optical fiber collimator (830) at one end close to the LED ultraviolet lamp (600) and the LED ultraviolet lamp (600); A narrow wave pass filter (510) is arranged between the visible monochromatic light source (500) and the electrolytic cell (200) to obtain a monochromatic light source.

2. A dual-beam photoelectrochemical testing device according to claim 1, characterized in that: The visible monochromatic light source (500) is a xenon lamp.

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