A preparation method of porous charcoal sheet for realizing high-efficiency light-to-heat-vapor conversion
A technology of photothermal conversion and charcoal, applied in the field of solar material preparation, can solve the problems of expensive precious metals, difficult to survive on a large scale, etc., and achieve the effects of low cost, simple operation and good adhesion
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Embodiment 1
[0029] 1) Place 3×3×1cm 3 The wood block is placed in a blast drying box and dried at 60°C for 24 hours; then it is placed in a quartz vacuum tube and kept at 300°C for 2 hours under the protection of a nitrogen atmosphere. The high temperature pyrolysis carbonization obtains carbonized monolithic charcoal; the quartz vacuum tube heating rate is 5 ℃ / min;
[0030] 2) Use a diamond cutter to cut the carbonized whole charcoal obtained in step 1) along the direction of the vertical charcoal channel to obtain a charcoal sheet with a thickness of 3mm;
[0031] 3) The charcoal flakes prepared in step 2) are ultrasonically cleaned with deionized water, and dried in a blast drying oven at 60-100°C to obtain porous charcoal flakes.
[0032] The prepared charcoal sheet has regular and vertical macroporous channels with a size of 35×35μm (such as figure 1 ), the light absorption rate in the range of 250~2500nm is 96.70% (such as figure 2 Shown).
Embodiment 2
[0034] 1) Place 3×3×1cm 3 Put the wood block in a blast drying box and dry it at 60℃ for 24h; then put it in a quartz vacuum tube under the protection of nitrogen atmosphere, keep it at 500℃ for 2h, and then pyrolyze and carbonize at high temperature to obtain carbonized whole charcoal; the heating rate of quartz vacuum tube 2℃ / min;
[0035] 2) Use a diamond cutter to cut the carbonized monolithic charcoal obtained in step 1) along the direction perpendicular to the charcoal channel to obtain a charcoal sheet with a thickness of 1 mm;
[0036] 3) The charcoal flakes prepared in step 2) are ultrasonically cleaned with deionized water, and dried in a blast drying oven at 60-100° C. to obtain porous charcoal flakes.
[0037] Such as figure 1 As shown, the prepared charcoal sheet has regular and vertical macroporous channels, the size of the holes is 20×30μm (such as image 3 ), the light absorption rate in the range of 250~2500nm is 97.9% (such as Figure 4 Shown).
Embodiment 3
[0039] 1) Place 3×3×1cm 3 Put the wood block in a blast drying box and dry it at 100℃ for 24h; then put it in a quartz vacuum tube under the protection of nitrogen atmosphere, keep it at 900℃ for 2h, and then pyrolyze and carbonize at high temperature to obtain a carbonized whole charcoal block; the quartz vacuum tube heats up The rate is 2℃ / min;
[0040] 2) Use a diamond cutter to cut the carbonized monolithic charcoal obtained in step 1) along the direction perpendicular to the charcoal channel to obtain a charcoal sheet with a thickness of 1 mm;
[0041] 3) The charcoal flakes prepared in step 2) are ultrasonically cleaned with deionized water, and dried in a blast drying oven at 60-100°C to obtain porous charcoal flakes.
[0042] The prepared charcoal sheet has regular and vertical macroporous channels with a size of 20×20μm (such as Figure 5 ), the light absorption rate within the range of 250~2500nm is 97.7% (such as Image 6 ).
[0043] The charcoal flakes obtained by the inve...
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