Li Jiajia, Huang Shuhong, Li Zhiyong, Zhao Xiaohui, Ouyang Bo, Kan Erjun, Zhao Jie, Zhang Wenming
Province-Ministry Co-construction, Collaborative Innovation Center of Hebei Photovoltaic Technology, College of Physics Science and Technology, Hebei University, 071002, Baoding, Hebei, P. R. China.
MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, 210094, Nanjing, P. R China.
Chemistry. 2023 Feb 7;29(8):e202202992. doi: 10.1002/chem.202202992. Epub 2022 Dec 20.
Exploring highly active and robust self-supporting air electrodes is the key for flexible Zn-air batteries (FZABs). Therefore, we report a novel 3D structural bimetal-based self-supporting electrode consisting of hybrid Cu, Co nanoparticles co-modified nitrogen-doped carbon nanosheets on carbon cloth (Cu, Co NPs@NCNSs/CC), which displays excellent electrochemical activity and durability of the oxygen reduction/evolution reaction (ORR/OER). The Cu, Co NPs@NCNSs/CC exhibits a half-wave potential of 0.863 V toward ORR and an overpotential of 225 mV at 10 mA cm toward OER, owing to its exposed bimetallic sites accelerating the kinetic reaction. In addition, the density functional theory calculation proves that the synergistic effect of CuCo sites favors ORR and OER. Hence, the FZABs based on Cu, Co NPs@NCNSs/CC achieve a larger open-circuit potential (1.45 V), higher energy density (130.10 mW cm ), and outstanding cycling stability. All remarkable results demonstrate valuable enlightenment for seeking advanced energy materials of portable and wearable electronics.
探索高活性和稳健的自支撑空气电极是柔性锌空气电池（FZABs）的关键。因此，我们报道了一种新型的基于3D结构双金属的自支撑电极，它由碳布上混合的铜、钴纳米颗粒共修饰的氮掺杂碳纳米片组成（Cu, Co NPs@NCNSs/CC），该电极对氧还原/析氧反应（ORR/OER）表现出优异的电化学活性和耐久性。Cu, Co NPs@NCNSs/CC对ORR的半波电位为0.863 V，在10 mA cm下对OER的过电位为225 mV，这归因于其暴露的双金属位点加速了动力学反应。此外，密度泛函理论计算证明CuCo位点的协同效应有利于ORR和OER。因此，基于Cu, Co NPs@NCNSs/CC的FZABs实现了更大的开路电位（1.45 V）、更高的能量密度（130.10 mW cm）和出色的循环稳定性。所有这些显著结果为寻找便携式和可穿戴电子产品的先进能量材料提供了有价值的启示。
