Pure TiO2 and Cu-doped TiO2 nanoparticles are synthesized by the biomediated green approach using the Bengal gram bean extract. The extract containing biomolecules acts as capping agent, which helps to control the size of nanoparticles and inhibit the agglomeration of particles. Copper is doped in TiO2 to enhance the electronic conductivity of TiO2 and its electrochemical performance. The Cu-doped TiO2 nanoparticle-based anode shows high specific capacitance, good cycling stability, and rate capability performance for its envisaged application in lithium-ion battery. Among pure TiO2, 3% Cu-doped TiO2, and 7% Cu-doped TiO2 anode, the latter shows the highest capacity of 250 mAh g–1 (97.6% capacity retention) after 100 cycles and more than 99% of coulombic efficiency at 0.5 A g–1 current density. The improved electrochemical performance in the 7% Cu-doped TiO2 is attributed to the synergetic effect between copper and titania. The results reveal that Cu-doped TiO2 nanoparticles might be contributing to the enhanced electronic conductivity, providing an efficient pathway forfast electron transfer.
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机译：使用孟加拉克豆提取物通过生物介导的绿色方法合成了纯TiO2和Cu掺杂的TiO2纳米颗粒。含有生物分子的提取物充当封端剂，有助于控制纳米粒子的大小并抑制粒子的团聚。铜掺杂在TiO2中以增强TiO2的电子电导率及其电化学性能。铜掺杂的TiO2纳米颗粒阳极显示出高的比电容，良好的循环稳定性和速率能力性能，可用于锂离子电池。在纯TiO2、3％的Cu掺杂的TiO2和7％的Cu掺杂的TiO2阳极中，经过100次循环或更长时间后，后者显示出250 mAh g -1 的最高容量（97.6％的容量保持率）。在0.5 A g –1 电流密度下，库仑效率达到99％以上。 7％Cu掺杂的TiO2中电化学性能的提高归因于铜和二氧化钛之间的协同作用。结果表明，掺杂Cu的TiO2纳米颗粒可能有助于增强电子电导率，从而为快速电子转移。
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