Platinum-free tungsten carbides as an efficient counter electrode for dye sensitized solar cells

Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea.
Chemical Communications (Impact Factor: 6.83). 10/2010; 46(45):8600-2. DOI: 10.1039/c0cc02247k
Source: PubMed


Mesoporous tungsten carbides displayed an excellent solar conversion efficiency (7.01%) as a counter electrode for dye sensitized solar cells under 100 mW cm(-2), AM 1.5G illumination, which corresponded to ca. 85% of the efficiency of the conventional platinum electrode.

35 Reads
  • [Show abstract] [Hide abstract]
    ABSTRACT: Co-deposited Pd and Au nanoparticles were loaded on phase-pure tungsten mono-carbide (WC) prepared by a polymer-induced carburization method. Among the electrocatalysts, Pd3Au/WC displayed an excellent electrochemical activity for the hydrogen oxidation reaction comparable to the state-of-the-art Pt/C catalyst both in half-cell tests and single cell tests under proton exchange membrane fuel cell (PEMFC) conditions. This unique and strong synergistic effect was not observed on the carbon support, and thus the crucial role of WC was demonstrated as a strongly interacting support as well as an active component of the electrocatalyst. Dissolution of Pd observed on the carbon support was suppressed in this Pd3Au/WC electrocatalyst, which showed good stability in a continuous operation for 3,000 min. Thus the proposed electrocatalyst could be a potential alternative anode catalyst of lower cost for PEMFC replacing Pt/C.
    Topics in Catalysis 10/2012; 55(14-15). DOI:10.1007/s11244-012-9875-2 · 2.37 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this study, WS2 films were prepared by doctor-blading technique and introduced into dye-sensitized solar cell (DSC) system as counter electrodes. To improve the electron conductivity and bonding strength between the active material and substrate, TiO2 (P25) and carbon nanoparticles were added in the WS2 films. We compared the electrochemical catalytic activity of WS2 with Pt for the reduction of triiodide to iodide by measuring cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The DSCs assembled with WS2/P25/C counter electrodes showed a photovoltaic conversion efficiency of 4.56%. Our study indicates that WS2 is a good candidate to replace the Pt counter electrodes in DSCs.
    Materials Letters 04/2012; 72:22–24. DOI:10.1016/j.matlet.2011.12.052 · 2.49 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In order to improve the electrochemical and optical performance of counter electrode for solar cells, a nanograss-structured electrode on silicon is explored as counter electrode for dye-sensitized solar cells (DSSCs). The nanograss-structured counter electrode is fabricated by dry etching of silicon and followed by metal deposition. The morphological, electrochemical and optical properties of the counter electrode are characterized by scanning electron microscopy, electrochemical impedance spectroscopy and reflection spectroscopy, respectively. Compared with traditional planar counter electrodes, the energy-conversion efficiency, fill factor and short-circuit current are increased by 15.1%, 1.5% and 12.1% by the nanograss-structured counter electrode for DSSCs, respectively. The results also show that, the nanograss-structured counter electrode can effectively enhance the light scattering, provide a larger contact area with electrolyte/Pt, and reduce the charge-transfer resistance.
    Journal of Power Sources 11/2012; 218:405–411. DOI:10.1016/j.jpowsour.2012.06.033 · 6.22 Impact Factor
Show more


35 Reads
Available from