以稻壳炭为原料,利用湿法提取二氧化硅,通过水热法合成了单金属和双金属硅酸盐电极材料,采用X射线衍射仪、扫描电子显微镜、全自动比表面及孔隙度分析仪进行形貌和结构分析,并研究了钴、镍不同物质的量比对电极材料电化学性能的影响。结果显示,在单金属系列电极循环伏安扫描曲线中,呈现Co3+/Co2+及Co4+/Co3+两对氧化还原峰,其中Co4+/Co3+对储能起到主要贡献。双金属因能够提供额外的氧化还原储能位点,其电化学储能性能较单金属显著提升。同时,钴和镍的含量变化显著影响了导电性能,当Co∶Si(物质的量比)=2∶1时,单金属硅酸盐电极材料有最佳比电容为244.7F/g(0.5A/g);而当Co∶Ni∶Si(物质的量比)=1∶1∶1时,双金属硅酸盐电极材料展现出最佳的比电容574.8F/g(0.5A/g),并且表现出良好的循环稳定性。该研究为稻壳炭的高效利用,以及新型环保电化学储能材料的开发提供了理论基础。
Silica was extracted from rice husk charcoal using a wet method.Then,single-metal and bimetallic silicate electrode materials were synthesized from the extracted silica via a hydrothermal method.The morphology and structure of the materials were analyzed using X-ray diffraction (XRD),scanning electron microscopy (SEM),and a fully automatic specific surface area and porosity analyzer.Furthermore,the influence of different molar ratios of cobalt and nickel on the electrochemical performance of the materials was investigated.The results showed that two pairs of redox peaks corresponding to Co3+/Co2+ and Co4+/Co3+ were observed in the cyclic voltammetry curves of the single-metal series of electrodes,with the Co4+/Co3+ pair significantly contributing to energy storage.The bimetallic electrodes demonstrated significantly enhanced electrochemical energy storage performance compared to the single-metal electrodes by providing additional redox energy storage sites.Additionally,the conductivity of the materials was greatly affected by variations in cobalt and nickel content.When the molar ratio of Co to Si was 2∶1,the single-metal silicate electrode material exhibited the best specific capacitance of 244.7F/g at 0.5A/g.In contrast,when the molar ratio of Co to Ni and Si was 1∶1∶1,the bimetallic silicate electrode material achieved the highest specific capacitance of 574.8F/g at 0.5A/g,indicating good cycling stability.This study provides a theoretical basis for the efficient utilization of rice husk charcoal and the development of novel eco-friendly electrochemical energy storage materials.
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基金资助
武汉科技大学煤转化与新型炭材料湖北省重点实验室开放基金(WKDM 202107)
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