氧化还原
层状双氢氧化物
电化学
过渡金属
X射线光电子能谱
电子转移
金属
材料科学
氢氧化物
无机化学
化学
离子
电极
化学工程
化学物理
物理化学
催化作用
冶金
有机化学
工程类
生物化学
作者
Xuejin Li,Meiyi Xin,Sheng Guo,Tonghui Cai,Dongfeng Du,Lianming Zhao,Wenyue Guo,Qingzhong Xue,Yan Zhang
标识
DOI:10.1016/j.electacta.2017.09.075
摘要
Recent years, there have been massive reports of layered double hydroxides (LDHs) used as electrode materials. However, the synergistic effect between different host metal ions on the electrochemical behavior of LDHs is rarely studied. We prepared a series of LDHs with different host metal combinations and investigated their physiochemical properties and redox behaviors to study the synergistic effects between different active metal ions. According to the experimental and theoretical calculation results, LDHs with dual transition metals possessed lower band-gap energies and higher conductivities than mono-transition metal-based samples. The reduced band-gap energy and enhanced conductivity should be ascribed to the hybridization between 3d-orbitals of different transition atoms. As a result, LDHs with dual transition metals exhibited lower charge transfer resistances and redox potentials as well as longer electron lifetime, implying that they could be oxidized or reduced more easily during the redox process. The lowest charge transfer resistance and longest electron lifetime of NiMn-LDHs signify that the synergistic effect between Ni and Mn is the best. From in situ X-ray photoelectron spectroscopy results, more than 50% Ni atoms in NiMn-LDHs can be oxidized under 0.45 V, which also demonstrates the excellent redox efficiency of NiMn-LDHs.
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