Fabrication and performance analysis of a low cost, Pt free counter electrode using carbon coated ZnAl layered double hydroxide (C/ZnAl-LDH) for dye sensitized solar cells

• Published in: Solar energy 2020-05, Vol.202, p.144-154
• Main Authors: George, Giphin, Saravanakumar, M.P.
• Format: Article
• Language: English
• Subjects: Carbon; Carbon based material; Circuits; Coated electrodes; Cost analysis; Counter electrode; Dye Sensitized Solar Cell; Dye-sensitized solar cells; Dyes; Electrochemical impedance spectroscopy; Electrochemical parameters; Electrochemistry; Electrode polarization; Electrodes; Energy conversion efficiency; Fabrication; Glass substrates; Hydroxides; Layered double hydroxides; Materials substitution; Open circuit voltage; Photovoltaic cells; Photovoltaics; Pyrolysis; Short circuit currents; Short-circuit current; Slurries; Solar cells; Solar energy; Spectroscopy; Spectrum analysis; Surface roughness
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2020.03.113

[Display omitted] •C/ZnAl-LDH nanoparticle were firstly employed as a CE material in DSSCs.•C/ZnAl-LDH was characterised using TEM, SEM, XRD, AFM and BET analysis.•Electocatalytic activity of the CEs was tested using CV, EIS and Tafel polarisation.•PCE of C/ZnAl-LDH CE was 3.18% which is comparable to Pt CE having 4.62%. Carbon based material represents an effective substitute for Pt counter electrodes (CEs) in Dye Sensitized Solar Cells (DSSCs). This study introduces a novel carbon coated ZnAl layered double hydroxides (C/ZnAl-LDH) can be utilised as an effective CE in DSSCs. C/ZnAl-LDH was synthesised by the pyrolysis of ZnAl-LDH using glucose solution. The synthesised C/ZnAl-LDH was characterised using TEM, SEM, XRD and BET analysis. The surface roughness of both Pt and C/ZnAl-LDH films were analysed using AFM spectroscopy. C/ZnAl-LDH slurry was pasted uniformly using doctor blade technique onto FTO glass substrate. The electrochemical measurements such as Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Tafel polarization recommends that C/ZnAl-LDH can be used as a CE due to its good reduction rate of I3- comparable with Pt CEs. The photovoltaic parameters were observed to be 0.66 V and 11.97 mA/cm2 for open circuit voltage (Voc) and short circuit current density (Jsc) respectively for C/ZnAl-LDH CE. The assembled cell with C/ZnAl LDH CE having power conversion efficiency (PCE) of 3.18% is comparable to Pt CE having 4.62% which is measured under the similar testing conditions.