Surface-oriented heterostructure of iron metal organic framework confined molybdenum disulfides as an efficient bifunctional electrocatalyst for overall water splitting

Velayutham R., Raj C., Jang H., Cho W., Palanisamy K., KAYA C., ...Daha Fazla

Materials Today Nano, cilt.24, 2023 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.mtnano.2023.100387
  • Dergi Adı: Materials Today Nano
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Bifunctional electrocatalyst, Iron metal organic framework, Molybdenum disulfide, Overall water splitting, Surface-oriented
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

The rational design of binder free, non-noble, highly active, cost effective and durability of bifunctional electrocatalyst for efficient overall water splitting is crucial for acquiring clean hydrogen energy systems. Herein, a surface-oriented in-situ growth of molybdenum disulfide on the non-precious iron metal organic frameworks is implemented by straightforward two-step solvothermal method. The optimum Fe-MOF@MoS2-6h electrocatalyst heterostructures achieves the highly active heterointerfaces of MoS2 and Fe-MOF, facilitates the mass/charge transport of the catalyst which improves the electrical conductivity. As a consequence, the optimal Fe-MOF@MoS2-6h achieves the lowest overpotential of ∼118 mV and ∼187 mV at 10 mA cm−2 for HER and OER, respectively, outperforming benchmark of Pt–C/NF and IrO2/NF. Moreover, an overall water splitting electrolyzer constructed using Fe-MOF@MoS2-6h||Fe-MOF@MoS2-6h electrocatalyst, requires only a cell voltage of 1.517 V to achieve a current density of 10 mA cm−2 which is comparable to Pt–C/NF||IrO2/NF (1.588 V) water splitting device. The precisely rational designed bifunctional Fe-MOF@MoS2-6h electrode also revealed no degradation in the stability test at 50 mA cm−2 for 100 h in alkaline electrolyte. This work proposes a practical strategy for highly efficient heterointerface electrocatalysts to achieve promising electrochemical water splitting.