纳米纤维素碳气凝胶制备及其电催化性能研究

Preparation and Performance Research of Cellulose Nanofibril-based Carbon Aerogel Electrocatalysts

关键词:  纳米纤维素  碳气凝胶  氧还原反应  锌-空气电池

Key Words:cellulose nanofibril  carbon aerogel  oxygen reduction reaction  zinc-air battery

摘要:本研究以纤维素纳米纤丝（CNF）为碳骨架，氮含量高的类石墨相氮化碳（g-C₃N₄）为氮源和造孔剂，成功制备了一种具有分级多孔结构的氮掺杂碳气凝胶（NCA）电催化剂。研究了NCA的物理化学结构与氧还原反应（ORR）活性之间的关系，以及其锌-空气电池性能。该NCA催化剂表现出较高的比表面积（381.77 m²/g）、分级多孔结构，氮掺杂含量3.27%。ORR测试结果表明，NCA具有优异的ORR催化活性，半波电位可达0.83 V，接近商业铂碳（Pt/C）电催化剂。进一步将NCA作为阴极催化剂用于组装水系锌-空气电池，在电流密度为10 mA/cm²下可以实现长达110 h的循环充放电，具有良好的电池使用性能。

Abstract:In this study， nitrogen doped carbon aerogel （NCA） electrocatalyst with hierarchical pore structure was successfully prepared by using cellulose nanofibril（CNF） as carbon framework and g-C₃N₄ with high nitrogen compound as nitrogen source and pore-forming agent.The physicochemical structure， oxygen reduction reaction （ORR） activity of NCA were investigated， and properties of zinc-air battery based on NCA were also studied.NCA revealed hierarchical pore structure with high specific surface area of 381.77 m²/g， and successful nitrogen doping with nitrogen doping content of 3.27%. NCA displayed excellent ORR performances with high half-wave potential of 0.83 V， which was close to that of commercial platinum-based electrocatalyst.The zinc-air battery in water phase using the NCA as a cathode material exhibited long-term stability for more than 110 h at a current density of 10 mA/cm²， showing a good battery serviceability.