Multifunctional α-MnO2 and Cr/Ni-Doped α-MnO2: a green approach to dye degradation and energy storage

Orak C., Horoz S.

Ionics, cilt.31, sa.6, ss.6483-6493, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 6
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1007/s11581-025-06338-6
  • Dergi Adı: Ionics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC
  • Sayfa Sayıları: ss.6483-6493
  • Anahtar Kelimeler: Cr/Ni doping, Dye degradation, Electrochemical performance, Green synthesis, Photocatalysis, Supercapacitors, α-MnO2
  • Sivas Cumhuriyet Üniversitesi Adresli: Hayır

Özet

This study explores the dual functionality of α-MnO2 and Cr/Ni-doped α-MnO2 as photocatalysts for dye degradation and as electrode materials for supercapacitors. α-MnO2 was synthesized using a green approach involving Aloe vera extract, and Cr/Ni doping was achieved via the addition of chromium and nickel precursors. Structural, morphological, and surface analyses confirmed successful doping, lattice expansion, and the introduction of oxygen vacancies, leading to enhanced performance. Photocatalytic tests showed a 47% increase in dye degradation rate for Cr/Ni-doped α-MnO2 compared to pristine α-MnO2 under visible light. Electrochemical evaluation revealed a significant improvement in specific capacitance, from 150 F/g for α-MnO2 to 230 F/g for Cr/Ni-doped α-MnO2, attributed to enhanced conductivity and active sites introduced by doping. The findings demonstrate the versatility of these materials in environmental remediation and energy storage applications, offering a promising pathway for multifunctional material design.