Synthesis of Co- and V-doped Ta1.1O1.05 electrode material using tryptophan- and aspartic-acid-functionalized boron-doped graphene quantum dots with excellent supercapacitor performance†
{"title":"Synthesis of Co- and V-doped Ta1.1O1.05 electrode material using tryptophan- and aspartic-acid-functionalized boron-doped graphene quantum dots with excellent supercapacitor performance†","authors":"Xia Jinming, Li Ruiyi, Li Zaijun and Gao Mingjie","doi":"10.1039/D4NJ04172K","DOIUrl":null,"url":null,"abstract":"<p >Tantalum oxide has emerged as an important electrode material for supercapacitors due to its multiple redox capabilities, high capacitance and structural stability, but the low electrical conductivity prevents its practical applications. This study reports the synthesis of Co- and V-doped Ta<small><sub>1.1</sub></small>O<small><sub>1.05</sub></small> using tryptophan- and aspartic-acid-functionalized boron-doped graphene quantum dots (DWB-GQD). Ta<small><sup>5+</sup></small>, V<small><sup>5+</sup></small> and Co<small><sup>3+</sup></small> were combined with DWB-GQD to form water-soluble complexes. The complex was then soaked in cotton, dried and annealed at 850 °C in an N<small><sub>2</sub></small> atmosphere. The resulting Ta<small><sub>1.1</sub></small>O<small><sub>1.05</sub></small> nanocrystals showed a cube-like nanostructure. The self-doping of low-valent Ta, V and Co species induced the production of oxygen vacancies. The presence of oxygen vacancies narrowed the bandgap and created new electron transfer pathways. The graphene surface modification accelerated the electron transfer from Ta<small><sub>1.1</sub></small>O<small><sub>1.05</sub></small> to graphene and improved the structural stability. The unique structure significantly improved the conductivity and led to a wide safe voltage window of 1.9 V. The symmetrical supercapacitor with Co/V–Ta<small><sub>1.1</sub></small>O<small><sub>1.05</sub></small>@DWB-GQD electrodes and a 1 M Li<small><sub>2</sub></small>SO<small><sub>4</sub></small>/PVA gel electrolyte exhibited high specific capacitance (560.9 F g<small><sup>−1</sup></small> at a current density of 1 A g<small><sup>−1</sup></small>), high-rate capacitance (365.55 F g<small><sup>−1</sup></small> at a current density of 10 A g<small><sup>−1</sup></small>), cycling stability (99.5% capacitance retention over 10 000 cycles), and energy density (140.63 W h kg<small><sup>−1</sup></small> at a power density of 475 W kg<small><sup>−1</sup></small>). Based on these results, the soft supercapacitor shows a wide application prospect in wearable electronic devices.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":" 47","pages":" 20085-20094"},"PeriodicalIF":2.7000,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Journal of Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/nj/d4nj04172k","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Tantalum oxide has emerged as an important electrode material for supercapacitors due to its multiple redox capabilities, high capacitance and structural stability, but the low electrical conductivity prevents its practical applications. This study reports the synthesis of Co- and V-doped Ta1.1O1.05 using tryptophan- and aspartic-acid-functionalized boron-doped graphene quantum dots (DWB-GQD). Ta5+, V5+ and Co3+ were combined with DWB-GQD to form water-soluble complexes. The complex was then soaked in cotton, dried and annealed at 850 °C in an N2 atmosphere. The resulting Ta1.1O1.05 nanocrystals showed a cube-like nanostructure. The self-doping of low-valent Ta, V and Co species induced the production of oxygen vacancies. The presence of oxygen vacancies narrowed the bandgap and created new electron transfer pathways. The graphene surface modification accelerated the electron transfer from Ta1.1O1.05 to graphene and improved the structural stability. The unique structure significantly improved the conductivity and led to a wide safe voltage window of 1.9 V. The symmetrical supercapacitor with Co/V–Ta1.1O1.05@DWB-GQD electrodes and a 1 M Li2SO4/PVA gel electrolyte exhibited high specific capacitance (560.9 F g−1 at a current density of 1 A g−1), high-rate capacitance (365.55 F g−1 at a current density of 10 A g−1), cycling stability (99.5% capacitance retention over 10 000 cycles), and energy density (140.63 W h kg−1 at a power density of 475 W kg−1). Based on these results, the soft supercapacitor shows a wide application prospect in wearable electronic devices.
氧化钽因其多重氧化还原能力、高电容和结构稳定性而成为超级电容器的重要电极材料,但其电导率低阻碍了其实际应用。本研究报道了用色氨酸和天冬氨酸功能化掺杂硼的石墨烯量子点(DWB-GQD)合成Co和v掺杂的ta1.101.05。Ta5+、V5+和Co3+与DWB-GQD结合形成水溶性配合物。然后将络合物浸泡在棉花中,在850°C的N2气氛中干燥和退火。得到的ta1.101.05纳米晶体呈立方体状纳米结构。低价Ta、V和Co的自掺杂诱导了氧空位的产生。氧空位的存在缩小了带隙,创造了新的电子转移途径。石墨烯表面改性加速了电子从ta1.101.05向石墨烯的转移,提高了结构的稳定性。独特的结构显著提高了电导率,并导致1.9 V的宽安全电压窗。采用Co/V - Ta1.1O1.05@DWB-GQD电极和1 M Li2SO4/PVA凝胶电解质的对称超级电容器具有高比电容(在电流密度为1 a g−1时为560.9 F g−1)、高倍率电容(在电流密度为10 a g−1时为365.55 F g−1)、循环稳定性(在10000次循环中电容保持率99.5%)和能量密度(在功率密度为475 W kg−1时为140.63 W h kg−1)。基于这些结果,软超级电容器在可穿戴电子器件中显示出广泛的应用前景。