Preparation of energy storage wood with metallic shell by Sn-Bi alloy/myristic acid

Wei Rongjun; Wang Zhichuang; Wang Xuechun; Wang Tinghuan; Wang Zhenyu; He Zhengbin; Yi Songlin

doi:10.12171/j.1000-1522.20240084

Journal of Beijing Forestry University > 2024 > 46(8): 25-33. > DOI: 10.12171/j.1000-1522.20240084

Wei Rongjun, Wang Zhichuang, Wang Xuechun, Wang Tinghuan, Wang Zhenyu, He Zhengbin, Yi Songlin. Preparation of energy storage wood with metallic shell by Sn-Bi alloy/myristic acid[J]. Journal of Beijing Forestry University, 2024, 46(8): 25-33. DOI: 10.12171/j.1000-1522.20240084

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Preparation of energy storage wood with metallic shell by Sn-Bi alloy/myristic acid

State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory of Wood Science and Engineering, Key Laboratory of Wooden Material Science and Application of Ministry of Education, School of Material Science and Technology, Beijing Forestry University, Beijing 100083, China

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Received Date: March 19, 2024
Revised Date: June 03, 2024
Accepted Date: June 04, 2024
Available Online: June 06, 2024

Graphical Abstract

Abstract

Abstract

Objective
In order to solve the problems of liquid leakage and poor thermal conductivity faced by wood-based phase change energy storage materials, we heat-treated myristic acid impregnated wood using Sn-Bi alloy, and introduced it into the wood under the drive of heat.
Method
Taking poplar wood impregnated with myristic acid as matrix, Sn-Bi alloy was combined with the matrix by alternating high and low temperature heat treatments to prepare energy storage wood with metal shells. Scanning electron microscope, Shore hardness tester, universal mechanics tester, thermal conductivity meter and differential scanning calorimeter were used to test the micro-morphology, surface hardness, compressive strength parallel to grain and thermal properties of the energy storage wood.
Result
The mass gain of samples during heat treatment at 160−220 ℃ for 1−5 min was significant. The mechanical and thermal properties of samples were improved with the increase of heat treatment temperature and time. Compared with untreated wood, the compressive strength parallel to grain and surface hardness were increased by 120.02%−149.59% and 13.53%−46.93%, respectively, and the axial and radial thermal conductivity were increased by 34.18%−165.67% and 38.11%−80.70%, respectively. The Sn-Bi alloy was filled best when heat-treated at 190 ℃ for 5 min, with surface hardness, axial and radial thermal conductivity reaching the highest values of 62.65 HD, 0.5324 and 0.2987 W/(m·K). Retention of myristic acid within the wood ranged from 27.54% to 63.68%, and the highest energy storage density of 59.38 J/cm³ was achieved after heat treating at 160 ℃ for 3 min.
Conclusion
Alternating high and low temperature heat treatment prompts the Sn-Bi alloy entering into the vessel of the wood, achieving different degrees of penetration. Three dimensional pore structures of wood and Sn-Bi alloy filled outside solves the problems of liquid leakage and poor thermal conductivity of phase change materials. The prepared energy storage wood combines the advantages of wood, metal and phase change materials, with better surface hardness, compressive strength parallel to grain and thermal properties, making it prospective for applications in building walls and energy-storage floors.
- composite materials,
- energy storage,
- phase transitions,
- poplar wood,
- myristic acid,
- Sn-Bi alloy,
- metallic shells

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References (28)

References

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Preparation of energy storage wood with metallic shell by Sn-Bi alloy/myristic acid