Sirisinudomkit Pichamon, Iamprasertkun Pawin, Krittayavathananon Atiweena, Pettong Tanut, Dittanet Peerapan, Sawangphruk Montree
Department of Chemical and Biomolecular Engineering, School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, 21210, Thailand.
Department of Chemical Engineering, Centre for Advanced Studies in Nanotechnology and Its Applications in Chemical Food and Agricultural Industries, and NANOTEC-KU-Centre of Excellence on Nanoscale Materials Design for Green Nanotechnology, Kasetsart University, Bangkok, 10900, Thailand.
Sci Rep. 2017 Apr 25;7(1):1124. doi: 10.1038/s41598-017-01191-8.
Although Nickel-Cadmium (NiCd) and Nickel-metal hydride (NiMH) batteries have been widely used, their drawbacks including toxic Cd and expensive La alloy at the negative electrodes, low energy density (40-60 Wh/kg for NiCd and 140-300 Wh/L for NiMH), low power density (150 W/kg for NiCd and 1000 W/kg for NiMH), and low working potential (1.2 V) limit their applications. In this work, Cd and La alloy were replaced with N-doped reduced graphene oxide aerogel (N-rGO) providing a hybrid energy storage (HES) having the battery and supercapacitor effects. The HES of Ni(OH)-coated N-rGO//N-rGO provides 1.5 V, a specific energy of 146 Wh/kg, a maximum specific power of 7705 W/kg, and high capacity retention over 84.6% after 5000 cycles. The mass change at the positive electrode during charging/discharging is 8.5 µg cm owing to the insertion/desertion of solvated OH into the α-Ni(OH)-coated N-rGO. At the negative electrode, the mass change of the solvated K, physically adsorbed/desorbed to the N-rGO, is 7.5 μg cm. In situ X-ray absorption spectroscopy (XAS) shows highly reversible redox reaction of α-Ni(OH). The as-fabricated device without using toxic Cd and expensive La alloy has a potential as a candidate of NiCd and NiMH.
尽管镍镉（NiCd）和镍氢（NiMH）电池已被广泛使用，但它们存在一些缺点，包括负极中有毒的镉和昂贵的镧合金、低能量密度（NiCd为40 - 60 Wh/kg，NiMH为140 - 300 Wh/L）、低功率密度（NiCd为150 W/kg，NiMH为1000 W/kg）以及低工作电位（1.2 V），这些限制了它们的应用。在这项工作中，用氮掺杂还原氧化石墨烯气凝胶（N-rGO）取代了镉和镧合金，从而提供了一种具有电池和超级电容器效应的混合储能（HES）。Ni(OH)包覆的N-rGO//N-rGO的HES提供1.5 V的电压、146 Wh/kg的比能量、7705 W/kg的最大比功率，并且在5000次循环后具有超过84.6%的高容量保持率。由于溶剂化的OH插入/脱嵌到α-Ni(OH)包覆的N-rGO中，充电/放电过程中正极的质量变化为8.5 μg/cm²。在负极，溶剂化的K在N-rGO上物理吸附/解吸，其质量变化为7.5 μg/cm²。原位X射线吸收光谱（XAS）显示α-Ni(OH)具有高度可逆的氧化还原反应。所制备的器件不使用有毒的镉和昂贵的镧合金，有潜力成为镍镉和镍氢电池的替代品。
