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1.
A Phase‐Separation Route to Synthesize Porous CNTs with Excellent Stability for Na+ Storage
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Zhi Chen Taihong Wang Ming Zhang Guozhong Cao 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(22)
Porous carbon nanotubes (CNTs) are obtained by removing MoO2 nanoparticles from MoO2@C core@shell nanofibers which are synthesized by phase‐segregation via a single‐needle electrospinning method. The specific surface area of porous CNTs is 502.9 m2 g?1, and many oxygen‐containing functional groups (C? OH, C?O) are present. As anodes for sodium‐ion batteries, the porous CNT electrode displays excellent rate performance and cycling stability (110 mA h g?1 after 1200 cycles at 5 A g?1). Those high properties can be attributed to the porous structure and surface modification to steadily store Na+ with high capacity. The work provides a facile and broadly applicable way to fabricate the porous CNTs and their composites for batteries, catalysts, and fuel cells. 相似文献
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Dye-sensitized solar cells (DSSCs) based on disulfide/thiolate (T2/T−) redox couples have attracted remarkable attention due to their high efficiency and low cost. As an indispensible part of DSSCs, counter electrode (CE) design plays a crucial role in high efficiency DSSCs. This mini-review paper selectively reviews the recent advances in T-mediated DSSCs using novel CE (namely cathode) materials, mainly including noble metal platinum (Pt), carbon materials, transition metal compounds (TMCs), polymers, and hybrids, thus highlighting the merits and demerits of alternative Pt catalysts, and the prospects and challenges of Pt-free CEs for the development of high-performance and low-cost DSSCs. 相似文献
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针对多智能体路径搜索算法在非指定式多车协同路径规划问题中路径冗长,计算效率低等缺陷,提出协同目标点分配
路径规划算法 Nutcracker-CBS。 首先构建紧耦合目标点分配 MAPF 框架,实现目标点分配和路径构建的联合寻优;针对目标点
分配模块,提出改进的星鸦优化算法,增量式求解分配问题,缩短模块用时;针对路径构建模块,提出改进的 MAPF 算法,通过回
退式约束构建机制,引入避碰路径估计的绕道机制和数据共享底层路径规划机制,提升效率和路径质量。 数据集实验中,
Nutcracker-CBS 时耗相比 SOTA 算法减少 90. 37% ;目标点分配模块求解耗时减少 86. 76% ;MAPF 模块 6 s 内构建 100 辆无人车
路径,平均路径长度缩短 6. 058% 。 实际实验中路径总和与系统运行时长分别减少 55. 26% 和 61. 29% ,提升了多机器人系统的
效率,降低了路径长度。 相似文献
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Aggregated α-Fe(2)O(3) nanoplates have been successfully synthesized under ionothermal conditions through the self-assembly of nanoplatelets in a side-to-side manner. During the formation process of aggregated α-Fe(2)O(3) nanoplates, pure ionic liquid media is essential for the assembly and coalescence of small nanoplatelets into final nanoplates. Moreover, the magnetic properties of the aggregated α-Fe(2)O(3) nanoplates are strongly correlated to their unique structural characteristics. 相似文献
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The back extraction of Pu from 30% TBP/kerosene with dihydroxyurea (DHU) was studied in relation to the contact time, nitric
acid concentration, phase ratio, etc. The back-extraction efficiency can reach 87% at phase ratio (o/a) ≤4: 1, contacting
time ≥1 min, niitric acid concentration ≤0.4 M, and reductant concentration ≥0.4 M at 15°C and Pu concentration in the organic
phase of 12 g l−1. The back-extraction efficiency decreases with an increase in the Pu(IV) concentration in the organic phase or in the Pu(III)
concentration in the aqueous phase. The application of DHU in Pu cycle was studied in a 12-step countercurrent cascade experiment.
The results show that DHU can satisfy the technical requirements at 15°C and phase ratio (2BF: 2BX: 2BS) = 4: 1: 1. The Pu
recovery efficiency is 99.96%. 相似文献
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综述了近年来新型锂离子电池正极材料LiFePO4的研究进展。从掺杂网状结构碳、碳纳米管、碳纳米纤维以及球形、棒状和空心LiFePO4的制备几个方面,对不同形貌与结构的LiFePO4的研究现状进行了介绍与讨论。碳掺杂可有效提高LiFePO4的导电性,并抑制粒径的增大;减小材料颗粒的粒径,可以从根本上提高颗粒的比表面积,有效减小电荷的移动距离,提高参与电化学反应材料的比例;而材料的特殊形貌有助于形成导电网络,对其导电性能的提高有着十分重要的影响。综上所述,通过减小颗粒的粒径、提高比表面积、掺杂导电剂以及制备更易形成导电网络形貌的材料,是获得优良性能LiFePO4的有效方法。 相似文献
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