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Framework Doping of Ni Enhances Pseudocapacitive Na-Ion Storage of (Ni)MnO2 Layered Birnessite
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-10-22 , DOI: 10.1021/acs.chemmater.9b02568 Xiaoqiang Shan 1 , Fenghua Guo 1 , Katharine Page 2 , Joerg C. Neuefeind 2 , Bruce Ravel 3 , A. M. Milinda Abeykoon 4 , Gihan Kwon 4 , Daniel Olds 4 , Dong Su 5 , Xiaowei Teng 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-10-22 , DOI: 10.1021/acs.chemmater.9b02568 Xiaoqiang Shan 1 , Fenghua Guo 1 , Katharine Page 2 , Joerg C. Neuefeind 2 , Bruce Ravel 3 , A. M. Milinda Abeykoon 4 , Gihan Kwon 4 , Daniel Olds 4 , Dong Su 5 , Xiaowei Teng 1
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We report a (Ni)MnO2 layered birnessite material with a framwork doping of Ni ions as the cathode for much enhanced aqueous Na-ion storage. Characterized by neutron total scattering and pair distribution function (PDF) analysis, in situ XRD, in situ X-ray PDF, XANES, and XPS, the synergistic interaction between disordered [NiO6] and ordered [MnO6] octahedra contribute to the enhanced specific capacity and cycle life (63 mAh g–1 at 0.2 A g–1 after 2000 full-cell cycles). Electro-kinetic analysis and structural characterizations show that stable local structure is maintained by [MO6] octahedra during charge–discharge processes, while disordered [NiO6] octahedra significantly improve pseudocapacitive redox charge storage. This finding may pave a new way for designing a new type of low-cost and high performance layered electrode materials.
中文翻译：
Ni的骨架掺杂增强（Ni）MnO 2层水钠锰矿的伪电容性钠离子存储
我们报告（Ni）MnO 2层水钠锰矿材料与Ni离子的框架掺杂作为阴极，大大增强了Na离子水溶液的存储。通过中子总散射和对分布函数（PDF）分析，原位XRD，原位X射线PDF，XANES和XPS表征，无序[NiO 6 ]和有序[MnO 6 ]八面体之间的协同相互作用有助于增强比容量和循环寿命（2000次全电池循环后，在0.2 A g –1时为63 mAh g –1）。电动分析和结构表征表明，[MO 6 ]八面体在充放电过程中保持稳定的局部结构，而[NiO 6 ]杂乱无章。]八面体显着改善了伪电容式氧化还原电荷的存储。这一发现可能为设计一种新型的低成本，高性能的分层电极材料铺平了一条新的道路。
更新日期：2019-10-23
中文翻译：
Ni的骨架掺杂增强（Ni）MnO 2层水钠锰矿的伪电容性钠离子存储
我们报告（Ni）MnO 2层水钠锰矿材料与Ni离子的框架掺杂作为阴极，大大增强了Na离子水溶液的存储。通过中子总散射和对分布函数（PDF）分析，原位XRD，原位X射线PDF，XANES和XPS表征，无序[NiO 6 ]和有序[MnO 6 ]八面体之间的协同相互作用有助于增强比容量和循环寿命（2000次全电池循环后，在0.2 A g –1时为63 mAh g –1）。电动分析和结构表征表明，[MO 6 ]八面体在充放电过程中保持稳定的局部结构，而[NiO 6 ]杂乱无章。]八面体显着改善了伪电容式氧化还原电荷的存储。这一发现可能为设计一种新型的低成本，高性能的分层电极材料铺平了一条新的道路。
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