Thermal decomposition derived nano molybdenum nitride for robust counter electrode in dye-sensitized solar cells

Priyada V. Rajeev, Subashini Gnanasekar, Kannan Gothandapani, Raja Sellappan, George Jacob, Vimala Raghavan, Sudhagar Pitchaimuthu*, Prasanat Sonar, N. Krishna Chandar, Soon Kwan Jeong, Maqusood Ahamed, Saravanan Pandiaraj, Muthumareeswaran Ramamoorthy, Andrews Nirmala Grace

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The unique category of transition metal nitrides has an immense scope as an electron-driven catalyst in redox reactions. However, synthesizing metal nitrides without contamination is very challenging. The residues present in the catalyst might affect catalytic activity. This work reports a simple synthesis of contamination-free nanoscale molybdenum nitride (Mo2N) powder by integrated wet chemical and thermal decomposition techniques at 800 ̊°C. Systematic structural and morphological studies were done, which shows the spherical shape of γ -Mo2N nanoparticles. Electrochemical and photovoltaic characteristics were studied using cyclic voltammetry, electrochemical impedance spectroscopy (EIS), Tafel polarization and J–V characteristics. As a result of high electrolyte diffusivity, less charge transfer resistance, high electrochemical stability and catalytic activity, the nano Mo2N based DSSCs exhibits 5.3 % efficiency, which is comparable to Pt-based device (6.4 %) fabricated under the similar condition that is 83.7 % of the performance offered by an expensive counter electrode. This simple synthesis method could enable low-cost mass production of Mo2N nanoparticles as counter electrodes in DSSC. The developed counter electrodes may be a suitable alternative for stable, efficient and low-cost DSSCs.

Original languageEnglish
Article number102070
JournalMaterials Today Communications
Volume26
Early online date23 Jan 2021
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Dye-sensitized solar cells
  • Electrocatalyst
  • MoN
  • Pt-fee catalyst
  • Redox reactions

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Materials Chemistry

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