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

Authors
  • Rajeev, Priyada V.
  • Gnanasekar, Subashini
  • Gothandapani, Kannan
  • Sellappan, Raja
  • Jacob, George
  • Raghavan, Vimala
  • Pitchaimuthu, Sudhagar
  • Sonar, Prasanat
  • Chandar, N. Krishna
  • Jeong, Soon Kwan
  • Ahamed, Maqusood
  • Pandiaraj, Saravanan
  • Ramamoorthy, Muthumareeswaran
  • Grace, Andrews Nirmala
Publication Date
Mar 01, 2021
Source
Queensland University of Technology ePrints Archive
Keywords
License
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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.

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