Xu Junming, Wei Ke, Wu Jianfeng, Wu Jun, Zhou Tao, Cheng J P, Hu Xiaoping
College of Electronic Information, Hangzhou Dianzi University, 310018, Hangzhou, China.
College of Information Science & Technology, Zhejiang Shuren University, 310015, Hangzhou, China.
Chempluschem. 2023 Sep;88(9):e202300315. doi: 10.1002/cplu.202300315.
Ni-Fe battery is one of prospective aqueous alkaline batteries due to its high safety, eco-friendliness and cost-effectiveness. However, the electrochemical performance of Fe-based anodes is limited due to the particle aggregation and low electric conductivity. In this work, iron powder is used as a precursor in a chemical bath deposition method. By optimizing the concentration of HNO , a balanced dissolution-crystallization process is achieved to obtain uniform Fe O nanospheres in size between 60 and 90 nm, which are separately anchored on ultrasonically prepared multilayer graphene (MLG). This composite delivers specific discharge capacities of 191.1 and 160.8 mAh g at the current densities of 2 and 10 A g , respectively. A Ni-Fe battery with the as-prepared Fe O /MLG as anode and Ni(OH) /MLG as cathode exhibits an energy density of 69.5 Wh kg at a high power density of 3931.6 W kg .
镍铁电池因其高安全性、生态友好性和成本效益而成为一种有前景的水性碱性电池。然而，由于颗粒团聚和低电导率，铁基阳极的电化学性能受到限制。在这项工作中，铁粉被用作化学浴沉积法的前驱体。通过优化硝酸的浓度，实现了平衡的溶解-结晶过程，以获得尺寸在60至90纳米之间的均匀Fe₂O₃纳米球，它们分别锚定在超声制备的多层石墨烯（MLG）上。这种复合材料在2和10 A g⁻¹的电流密度下分别具有191.1和160.8 mAh g⁻¹的比放电容量。以制备的Fe₂O₃/MLG为阳极、Ni(OH)₂/MLG为阴极的镍铁电池在3931.6 W kg⁻¹的高功率密度下表现出69.5 Wh kg⁻¹的能量密度。
