Scholarlink

<p>Recent advances in energy storage devices have earned recognition for the rapid development of sustainable chemistry in the synthesis of metal oxides using plants and their components as reducing agents. In this study, <i>Mentha piperita</i> leaf extract was used as a reducing agent to synthesize zinc oxide (ZnO) for use in supercapacitors along with starch as stabilizing agent. Three powder samples, ZnO (Zn), ZnO reduced with <i>Mentha piperita</i> leaf extract (ZnM), and ZnO reduced with <i>Mentha piperita</i> leaf extract stabilized with starch (ZnMS) were synthesized and systematically characterized. Among the samples, ZnO reduced with <i>Mentha. piperita</i> leaf extract stabilized with starch (ZnMS) exhibited a larger crystallite size according to XRD analysis, and showed a rod-shaped morphology as observed in SEM and FESEM analyses. The presence of oxygen vacancies were confirmed by EDAX, a higher specific surface area from BET analysis, and a reduced optical band gap of 2.99&#xa0;eV from optical studies. The electrochemical studies for the as prepared materials were made with three-electrode configuration. The electrode made using the powder sample ZnO reduced with <i>Mentha piperita</i> leaf extract stabilized with starch (ZnMS) coated on a graphite sheet exhibited a specific capacitance of 56 F/g at 1 A/g and retained 99% of its initial capacitance after 5000 charge–discharge cycles at 5 A/g. Furthermore, a symmetric two-electrode device fabricated using electrodes exhibited a specific capacitance of 38 F/g at 1A/g and excellent cycling stability with 90.57% over 5000 cycles for 1 A/g. The corresponding energy density and power density were calculated to be 12.16 and 1.57 W/kg, respectively. These results demonstrate that ZnO reduced with <i>Mentha piperita</i> leaf extract stabilized with starch (ZnMS) is a highly promising electrode material for supercapacitor applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Starch-stabilized zinc oxide via Mentha piperita extract: a pathway to sustainable energy storage

  • 期刊论文

  • 发表日期：

    2026年5月19日

查看全文
  • Pavithra S,
  • Tamilmani Nagarajan,
  • Banu A,
  • Sakunthala A,
  • Jitendra Pal Singh,
  • Saravanakumar M,
  • Akhmad Herman Yuwon,
  • M. V. Reddy

摘要

Recent advances in energy storage devices have earned recognition for the rapid development of sustainable chemistry in the synthesis of metal oxides using plants and their components as reducing agents. In this study, Mentha piperita leaf extract was used as a reducing agent to synthesize zinc oxide (ZnO) for use in supercapacitors along with starch as stabilizing agent. Three powder samples, ZnO (Zn), ZnO reduced with Mentha piperita leaf extract (ZnM), and ZnO reduced with Mentha piperita leaf extract stabilized with starch (ZnMS) were synthesized and systematically characterized. Among the samples, ZnO reduced with Mentha. piperita leaf extract stabilized with starch (ZnMS) exhibited a larger crystallite size according to XRD analysis, and showed a rod-shaped morphology as observed in SEM and FESEM analyses. The presence of oxygen vacancies were confirmed by EDAX, a higher specific surface area from BET analysis, and a reduced optical band gap of 2.99 eV from optical studies. The electrochemical studies for the as prepared materials were made with three-electrode configuration. The electrode made using the powder sample ZnO reduced with Mentha piperita leaf extract stabilized with starch (ZnMS) coated on a graphite sheet exhibited a specific capacitance of 56 F/g at 1 A/g and retained 99% of its initial capacitance after 5000 charge–discharge cycles at 5 A/g. Furthermore, a symmetric two-electrode device fabricated using electrodes exhibited a specific capacitance of 38 F/g at 1A/g and excellent cycling stability with 90.57% over 5000 cycles for 1 A/g. The corresponding energy density and power density were calculated to be 12.16 and 1.57 W/kg, respectively. These results demonstrate that ZnO reduced with Mentha piperita leaf extract stabilized with starch (ZnMS) is a highly promising electrode material for supercapacitor applications.