Phase transformation and electrochemical charge storage properties of vanadium oxide/carbon composite electrodes synthesized via integration with dopamine
Phase transformation and electrochemical charge storage properties of vanadium oxide/carbon composite electrodes synthesized via integration with dopamine
复制标题
与多巴胺结合合成的氧化钒/碳复合电极的相变和电化学电荷存储性能
DOI：
10.1111/jace.18502
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Pomerantseva, Ekaterina
中科院分区：
文献类型：
--
作者：
Andris, Ryan;Averianov, Timofey;Pomerantseva, Ekaterina
以化学预插层的多巴胺（DOPA）分子为还原剂和碳前驱体，通过水热处理或水热处理后在氩气保护下退火制备了δ-V2 O 5·nH 2 O/C、H2 V3 O 8/C、VO 2（B）/C和V2 O3/C纳米复合材料。研究发现，合成（DOPA）xV 2 O 5前驱体时，DOPA与V2 O 5的比例对复合材料的相组成和形貌有很大的影响，DOPA通过扩散进入δ-V2 O 5·nH 2 O骨架的层间区域而形成（DOPA）xV 2 O 5.反应混合物中DOPA浓度的增加导致复合材料结构中钒的更显著的减少和更高分数的碳，如通过X射线光电子能谱和拉曼光谱测量所证明的。在具有非水电解质的锂离子电池中评价了合成的纳米复合材料的电化学电荷储存性能。δ-V2 O 5·nH 2 O/C、H2 V3 O 8/C、VO 2（B）/C和V2 O3/C电极分别提供214、252、279和637 mAh g-1的高初始容量。这项调查提供的见解开辟了创造新的纳米复合氧化物/碳电极的各种应用，如能量存储，传感和电致变色器件的可能性。
Chemically preintercalated dopamine (DOPA) molecules were used as both a reducing agent and a carbon precursor to prepare δ‐V2O5·nH2O/C, H2V3O8/C, VO2(B)/C, and V2O3/C nanocomposites via hydrothermal treatment or hydrothermal treatment followed by annealing under Ar flow. We found that the phase composition and morphology of the produced composites are influenced by the DOPA:V2O5ratio used to synthesize (DOPA)xV2O5precursors through DOPA diffusion into the interlayer region of the δ‐V2O5·nH2O framework. The increase of DOPA concentration in the reaction mixture led to a more pronounced reduction of vanadium and a higher fraction of carbon in the composites’ structure, as evidenced by X‐ray photoelectron spectroscopy and Raman spectroscopy measurements. The electrochemical charge storage properties of the synthesized nanocomposites were evaluated in Li‐ion cells with nonaqueous electrolytes. δ‐V2O5·nH2O/C, H2V3O8/C, VO2(B)/C, and V2O3/C electrodes delivered high initial capacities of 214, 252, 279, and 637 mAh g–1, respectively. The insights provided by this investigation open up the possibility of creating new nanocomposite oxide/carbon electrodes for a variety of applications, such as energy storage, sensing, and electrochromic devices.