Regulating N-doped biochar with Fe-Mo heterojunctions as cathode in long-life zinc-air battery
Recently, PhD student Miss Xiao-ru Meng, supervised by Dr. Shuai Gao and Prof. Zhen Fang, published a research article on synthesizing cathode from soybean straw for zinc-air battery.
Carbonaceous electrode loaded nano Mo2C-Fe3N@NCF was synthesized by solvothermal and pyrolysis from soybean straw for high-performance zinc-air batteries (ZABs). The empowered ZAB achieved 1.51 V open-circuit voltage, 88.40 mW cm−2 power density and over 1150 h cycle life. Density functional theory analysis indicates that charge transfer from Mo2C-Fe3N heterogeneous structure to N-doped biochar can significantly reduce the reaction barrier for oxygen reduction/evolution reactions, enhancing the adsorption of oxygen intermediates. Cellulose-derived carbon provides a large specific surface area, and N-doping enhances the conductivity of the resultant biochar, which both play a crucial role in the efficient loading of Fe and Mo active sites. This work inspires the design and application of interfacial engineering on low-cost biochar carriers.
Related results were published in Chemical Engineering Journal:
XR Meng, S Gao*, NX Liu, PD Wu, Zhen Fang*. Regulating N-doped biochar with Fe-Mo heterojunctions as cathode in long-life zinc-air battery, Chemical Engineering Journal, 500 (2024), 157463. https://doi.org/10.1016/j.cej.2024.157463
Carbonaceous material with multilayer structure derived from soybean straw was developed for long-life zinc-air batteries一种由大豆秸秆衍生的多层结构碳质材料，用于长寿命锌空气电池。
以Fe-Mo异质结为阴极调控长寿命锌空气电池中的 N 掺杂生物炭
近期，博士生孟晓茹同学在高帅博士和方真教授的指导下，在国际学术期刊Chemical Engineering Journal发表了一篇关于生物炭制备高性能氧电催化剂的研究性论文。
碳质电极负载纳米Mo2C-Fe 3N@NCF 是通过大豆秸秆的溶剂热和热解合成的，用于高性能锌空气电池（ZABs）。可逆的ZAB实现了1.51 V开路电压，88.40 mW cm−2功率密度和超过1150小时的循环寿命。密度泛函理论分析表明，从Mo2C-Fe3N向N掺杂生物炭发生电荷转移，此非均相结构可以显著降低氧还原/析出反应的反应势垒，增强氧中间体的吸附。纤维素衍生的碳提供了较大的比表面积，而N掺杂增强了所得生物炭的电导率，这两者都在Fe和Mo活性位点的有效负载中起着至关重要的作用。这项工作启发了界面工程在低成本生物炭载体上的设计和应用。
结果发表在Chemical Engineering Journal:
XR Meng, S Gao*, NX Liu, PD Wu, Zhen Fang*, Regulating N-doped biochar with Fe-Mo heterojunctions as cathode in long-life zinc-air battery, Chemical Engineering Journal, 500 (2024), 157463. https://doi.org/10.1016/j.cej.2024.157463
