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| 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 |
| 收稿日期：2022-02-28 |
| DOI：10.11980/j.issn.0254-508X.2022.06.003 |
| 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 |
| 基金项目:国家自然科学基金（31971614）；中国博士后基金（2019T120725、2019M652882和2019M662924）。 |
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| 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. |
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