Multi-3D hierarchical biomass-based carbon particles absorber for solar desalination and thermoelectric power generator

• 作者: Hao Jiang Xuemin Geng Simin Li Hongyu Tu Jiliang Wang Lixia Bao Peng Yang Yanfen Wan
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（24）
• 页码范围: 180-188
• 页数: 9页
• 语种: 英文

摘要

To meet challenges of the global energy crisis and the freshwater resources shortage,the interfacial solar-to-steam conversion (ISSC) system was developed quickly in recent years.The photothermal materials play an important role in the ISSC system.We are devoted to developing a unique photothermal material integrating multiple 3D design philosophy both at macroscopic and microscopic levels by employing the cost-effective and widespread resources like straw,rose and coffee grounds,for carbonization as solar absorbers.The biomass-based carbonized particles (CPs) possess three major advantages:(1) wide size-distribution is accessible to form 3D porous rough surface of absorber layer to enhance ability of light absorption;(2) the pristine hierarchical microstructure could absorb nearly all the incident light;(3) the intrinsic vascular bundles with pores on their lumen walls provide a rapid and omnidirectional transport for water and steam escape.A high-efficient solar steam device was fabricated based on the absorber material with its internal 3D micro textures and external 3D architectures.Under the illumination of 1 sun,the photothermal conversion efficiency of straw,rose and coffee CPs can reach 93.4 ％,92.8 ％ and 76 ％,respectively.Simultaneously,a high-efficient solar thermoelectric generator (STEG) is made by coating CPs on a commercial thermoelectric generator and the maximum power of STEG can reach 538.0μW.Such scalable biomass-based photothermal materials and high-grade thermoelectric conversion capability could be applied to the water purification and the electricity production.