Journal
CHEMICAL ENGINEERING JOURNAL
Volume 400, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125832
Keywords
Ni-Zn battery; NiMoO4; Electrolyte additive; Cathode; Nanowires
Categories
Funding
- National Natural Science Foundation of China [U1810110, 21822509]
- Guangdong Province Innovation and Strong School Project [2016KTSCX142]
- Science Foundation for Young Teachers of Wuyi University [5041700133, 5041700167]
- Jiangmen basic and theoretical scientific research science and technology plan project [2019JC01009]
- Science and Technology Projects of Jiangmen [(2017) 307, (2017) 149, (2018) 352]
- Cooperative education platform of Guangdong Province [(2016) 31]
- Innovative Research Team in University of Guangdong [2015KCXTD027]
- Key Laboratory of Optoelectronic materials and Applications in Guangdong Higher Education [2017KSYS011]
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Nickel-based oxides for aqueous rechargeable nickel-zinc (denoted as Ni//Zn) batteries typically suffer from the low capacity and inferior stability due to their slow electron/ion transportation rate and poor electrochemical reversibility. Here, we rationally design a free-standing Ni/C nanosheets (NC) from Ni metal-organic framework as conductive scaffold for NiMoO4 nanowires (NiMoO4-NC), achieving exceptionally high capacity and rate capability. Furthermore, with the use of a new MoO42--based electrolyte, a stable aqueous Ni//Zn battery with impressive electrochemical performance is also demonstrated based on this NiMoO4-NC cathode. Experimental results reveal that the NC skeleton can dramatically improve the conductivity and ion diffusion rate of the NiMoO4 nanowires, while the addition of MoO42- into electrolyte can effectively suppress the dissolution and structural destruction of NiMoO4 nanowires. As a consequence, a remarkable capacity (229.2 mAh g(-1) at 3.4 A g(-1)) and excellent durability (85.9% capacity retention after 3000 cycles) are delivered by this Ni//Zn battery, outperforming most reported Ni//Zn batteries. Also, this Ni//Zn battery displays an admirable energy density of 407.8 Wh kg(-1), together with a remarkable power density of 18.1 kW kg(-1), which is of great significance for future electronic application.
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