Currently, environmental protection, energy conservation, and health are globally significant issues that have garnered widespread attention. In the pursuit of sustainable and environmentally friendly development, biomass-based porous materials (BPMs) have demonstrated revolutionary potential for thermal insulation. This review provides a comprehensive overview of recent advances in BPMs for thermal insulation. Initially, the heat transfer mechanisms in BPMs, including solid conduction, gas conduction, and radiation, are discussed. Then, key factors influencing the insulation performance of BPMs, including microstructure, the intrinsic properties of their components, thermal stability, and application environments, are summarized to guide material selection and structural design. BPMs are then classified dimensionally (i.e., 1D, 2D, and 3D), with a detailed analysis of fabrication methodologies, raw material sources (e.g., proteins, cellulose, chitosan, alginate, and lignin), and performance characteristics. Applications of BPMs in emerging thermal insulation domains, including personal thermal management, building, electronic devices, oil and gas industry, aerospace industry, and vehicles industry, are comprehensively summarized. Finally, the inherent superiority of BPMs in terms of biodegradability and recyclability is highlighted, underscoring their superiority to petroleum-based counterparts. This review is expected to stimulate further research and development of BPMs in thermal insulation applications, accelerating advancements in both fundamental studies and industrial commercialization.
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