海泡石增强的炭泡沫相变储能材料及其光-热-电转化性能

卓祖优; 宋生南; 沈永康; 陈燕丹

海泡石增强的炭泡沫相变储能材料及其光-热-电转化性能

福建农林大学材料工程学院, 福建福州350108

基金项目: 国家自然科学基金 (31870561；32171726)

详细信息

通讯作者:
陈燕丹，博士，教授，博士生导师，研究方向为生物质资源高效转化利用　E-mail: fjaucyd@163.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-18
- 修回日期: 2022-08-25
- 录用日期: 2022-09-02
- 网络出版日期: 2022-09-21
- 刊出日期: 2023-07-15

Sepiolite reinforced carbon foam composite toward phase change energy storage material and its light-thermal-electric conversion performance

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, Fujian, China

Funds: National Natural Science Foundation of China(No. 31870561；32171726)

摘要

摘要: 聚乙二醇(PEG)具有高相变焓、可生物降解、无毒、耐腐蚀等优点，是一种优异的相变材料。但容易泄露和导热性差这两大缺点阻碍了它的大规模应用。为此，本研究以小麦面粉作为基体，海泡石纤维为增强体，利用酵母发酵产气的微生物发泡技术和高温炭化工艺，制得海泡石增强的生物质炭泡沫复合材料作为PEG相变材料载体。实验结果显示，海泡石/炭泡沫复合材料SCF-10-800的抗压强度可达5.42 MPa。负载PEG后制得的复合相变材料SCF-5-1000@PEG，导热系数达到0.39 W/(m·K)，熔化焓和凝固焓分别为123.4 J·g⁻¹和106.6 J·g⁻¹，并具备优异的抗泄露能力。基于SCF-5-1000@PEG为光吸收源，所组装的光驱动热电转换系统具有63.2%光热转化效率，且可以实现400多秒的稳定电流输出，彰显其在光-热能-电能转换系统的应用潜能。
- 小麦面粉 /
- 海泡石 /
- 聚乙二醇 /
- 相变储能 /
- 光-热-电能转化
Abstract: Polyethylene glycol (PEG) is an excellent phase change material with high phase change enthalpy, biodegradability, non toxicity and corrosion resistance. However, the easy leakage and poor thermal conductivity hinder its large-scale application. Therefore, with wheat flour as the matrix, a biomass carbon foam composite reinforced by sepiolite was prepared as the efficient carrier of PEG phase change material by using microbial foaming and high temperature carbonization technology. The experimental results show that the compressive strength of sepiolite/carbon foam composite SCF-10-800 can reach 5.42 MPa. The thermal conductivity of the composite phase change material SCF-5-1000@PEG prepared reaches 0.39 W/(m·K), and its melting enthalpy and solidification enthalpy are 123.4 J·g⁻¹ and 106.6 J·g⁻¹, respectively. Meanwhile, it has excellent leakage resistance. Using SCF-5-1000@PEG as an optical absorption source, a light driven thermoelectric conversion system was assembled, which shows a light to heat conversion efficiency of 63.2% and can achieve a stable current output for more than 400 seconds, demonstrating its application potential in the light-thermal-electric energy conversion system.
- wheat flour /
- sepiolite /
- polyethylene glycol /
- phase change energy storage /
- light-thermal-electric energy conversion

HTML全文

图 1 采用真空浸渍法制备海泡石/炭泡沫复合材料SCF-X-Y@聚乙二醇(PEG)的流程图

Figure 1. Flow chart of sepiolite/carbon foam composite SCF-10-800@Polyethylene glycol (PEG) prepared by vacuum impregnation method

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图 2 海泡石/炭泡沫复合材料SCF-X-800的孔隙率、开孔率和PEG负载量对比图

Figure 2. Comparison diagram of porosity, porosity and polyethylene glycol load of sepiolite/carbon foam composite SCF-X-800

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图 3 海泡石对酵母发酵泡孔结构形成的影响示意图

Figure 3. Effect of sepiolite on the formation of bubble structure in yeast fermentation

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图 4 海泡石/炭泡沫复合材料SCF-X-800的抗压强度 (a)；热导率对比图 (b)

Figure 4. Compressive strength (a) and thermal conductivity comparison diagram of sepiolite/carbon foam composite SCF-X-800 (b)

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图 5 海泡石/炭泡沫复合材料SCF-5-Y的孔隙率、开孔率和聚乙二醇负载量对比图

Figure 5. comparison diagram of porosity, porosity and polyethylene glycol load of sepiolite/carbon foam composite SCF-5-Y

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图 6 (a)SCF-5-Y的抗压强度；(b)SCF-5-Y、SCF-5-Y@PEG和PEG的热导率值

Figure 6. (a) Compressive strength of Sepiolite/carbon foam composite SCF-5-Y; Thermal conductivity values of (b) SCF-5-Y, Sepiolite/carbon foam composites SCF-5-Y@PEG and PEG

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图 7 (a)海泡石；(b-c) SCF-5-1000；(d) SCF-5-1000@PEG的SEM照片

Figure 7. SEM images of sepiolite (a), SCF-5-1000 (b-c) and SCF-5-1000@PEG (d)

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图 8 (a)PEG和SCF-5-Y@PEG的DSC 曲线图；SCF-5-Y@PEG的(b)实际熔化焓ΔH_M与理论熔化焓ΔH_TM；(c)实际凝固焓ΔH_F与理论凝固焓ΔH_TFFig. 8(a) DSC curves of PEG and SCF-5-Y@PEG; (b) ΔH_M and ΔH_TM of SCF-5-Y@PEG; (c)ΔH_F and Δ H_TF of SCF-5-Y@PEG

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图 9 PEG和SCF-5-Y@PEG样品加热到 80℃的数码照片

Figure 9. Digital photos of PEG and SCF-5-Y@PEG samples heated to 80℃

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图 10 PEG和SCF-5-1000@PEG复合相变材料在光照和冷却过程中的热响应

Figure 10. Thermal response of PEG and SCF-5-1000@PEG phase change composite materials during illumination and cooling

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图 11 (a)光驱动热电转换系统装置；(b)基于SCF-5-1000@PEG的太阳能热电装置示意图；在300 mW·cm⁻²模拟太阳光照射下；(c) SCF-5-1000@PEG的电流/温度-时间曲线；(d) SCF-5-1000@PEG和PEG的电流-时间曲线

Figure 11. (a) Light-driven thermoelectric conversion device; (b) Schematic diagram of SCF-5-1000@PEG-based solar thermoelectric device; (c) Current/temperature-time curves of SCF-5-1000@PEG and (d) current-time curves of SCF-5-1000@PEG and PEG under simulated sunlight irradiation of 300 mW•cm^-2

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表 1 SCF-5-1000@PEG同近几年报道的不同相变储能材料的热学性能对比

Table 1. Thermal properties of SCF-5-1000@PEG comparison with different phase change energy storage materials reported in recent years

Samples	PCM	ΔH_M/(J·g⁻¹)	ΔH_F/(J·g⁻¹)	References
PGI-PEG 50	PEG 6000	86.93	83.65	[19]
PGI/PEG	PEG 6000	86.9	70.1	[20]
PEG/BC-2	PEG 6000	71.17	68.43	[21]
PCM	PEG 6000	97.2	92.3	[22]
Fe₃O₄−GNS/PCM-4	PEG 6000	101.5	55.7	[23]
PCM-6000	PEG 6000	76.37	80.46	[24]
SCF-5-1000@PEG	PEG 6000	123.4	106.6	This work
Notes：PCM means phase change materials; ΔH_M and ΔH_F are the enthalpy of melting and enthalpy of solidification,respectively.

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