生物质纤维素基多功能材料构建及其在新型能量存储方面的应用

张奇, 李晓东, 王文雯, 刘晓

Rational design of multifunctional cellulose based materials for their application in emerging energy storage

Qi ZHANG, Xiaodong LI, Wenwen WANG, Xiao LIU

图5 木材基和纤维素基被动辐射制冷材料的构建。原始木材(a) 及制冷木材(b) 的数码照片；制冷木材的轴向(生长方向)导管(c) 和部分与轴向排列的纤维素纳米纤维(d) 扫描电镜图；(e) 木材天然结构散射太阳辐射示意图；(f) 纤维素官能团分子振动发射红外光示意图；(g) 制冷木材制冷效果的实时测量装置[29]。 (h) 由生物质纤维素和二氧化硅构建制冷木质纤维素基块体材料示意图；制冷木质纤维素基块体材料弯曲(i) 和拉伸(j) 力学试验图；(k) 制冷木质纤维素基块体材料发射红外波和散射太阳光示意图；(l) 辐射制冷效果的测量装置示意图；(m) 辐射制冷功率、周围环境温度(黑色)和块体材料表面温度(红色)周期性监测[30]

Fig. 5 Cooling wood demonstrates passive daytime radiative cooling. Photos of (a) natural wood and (b) cooling wood. (c) SEM image of the cooling wood showing the aligned wood channels. (d) SEM image of partially aligned cellulose nanofibers of the cooling wood. (e) Schematic diagram of the wood structure strongly scattering solar irradiance. (f) Schematic diagram of infrared emission by molecular vibration of the cellulose functional groups. (g) Setup of the real-time measurement of the sub-ambient cooling performance of the cooling wood[29]. (h) Fabrication process of the cooling lignocellulosic bulk by low cost cellulose and silicon dioxide. (i) Bending stress curves, (j) tensile stress curves for the cooling lignocellulosic bulk and pure wood fibers bulk. (k) Schematic diagram of the cooling lignocellulosic bulk with infrared emission and scattering solar irradiance. (l) Schematic diagram of the thermal box for demonstrating radiative cooling performance. (m) A 2-day continuous measurement of radiative cooling power, the ambient temperature (black) and the surface temperature (red) of a cooling lignocellulosic bulk under direct thermal testing[30]