National and Local Joint Engineering Research Center of Advanced Carbon Based Ceramics Preparation Technology, Collaborative Innovation Center for High Value Utilization of Industrial By-products, School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, PR China.
National and Local Joint Engineering Research Center of Advanced Carbon Based Ceramics Preparation Technology, Collaborative Innovation Center for High Value Utilization of Industrial By-products, School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, PR China.
J Colloid Interface Sci. 2023 Oct 15;648:511-519. doi: 10.1016/j.jcis.2023.05.164. Epub 2023 May 30.
In this study, we present a bimetallic ion coexistence encapsulation strategy employing hexadecyl trimethyl ammonium bromide (CTAB) as a mediator to anchor cobalt-nickel (CoNi) bimetals in nitrogen-doped porous carbon cubic nanoboxes (CoNi@NC). The fully encapsulated and uniformly dispersed CoNi nanoparticles with the improved density of active sites help to accelerate the oxygen reduction reaction (ORR) kinetics and provide an efficient charge/mass transport environment. Zinc-air battery (ZAB) equipped CoNi@NC as cathode exhibits an open-circuit voltage of 1.45 V, a specific capacity of 870.0 mAh g, and a power density of 168.8 mW cm. Moreover, the two CoNi@NC-based ZABs in series display a stable discharge specific capacity of 783.0 mAh g, as well as a large peak power density of 387.9 mW cm. This work provides an effective way to tune the dispersion of nanoparticles to boost active sites in nitrogen-doped carbon structure, and enhance the ORR activity of bimetallic catalysts.
在这项研究中，我们提出了一种双金属离子共存包封策略，使用十六烷基三甲基溴化铵（CTAB）作为媒介物将钴-镍（CoNi）双金属锚定在氮掺杂多孔碳立方纳米盒（CoNi@NC）中。完全封装和均匀分散的 CoNi 纳米颗粒具有更高密度的活性位点，有助于加速氧还原反应（ORR）动力学，并提供高效的电荷/质量传输环境。配备 CoNi@NC 作为阴极的锌空气电池（ZAB）表现出 1.45 V 的开路电压、870.0 mAh g 的比容量和 168.8 mW cm 的功率密度。此外，两个串联的 CoNi@NC 基 ZAB 显示出稳定的放电比容量为 783.0 mAh g，以及高达 387.9 mW cm 的峰值功率密度。这项工作提供了一种有效的方法来调节纳米颗粒的分散度，以提高氮掺杂碳结构中的活性位点，并增强双金属催化剂的 ORR 活性。
