• Electrocatalysts for energy conversion

•Development of earth abundant electrocatalysts for HER/OER, by understanding the correlation between the electrode framework (surface composition) and its electrochemical behavior.

•Investigation and tuning of multi-metallic bifunctional nanomaterials for water-splitting & PEM electrolyzers applications.

  • Synthesis of nanomaterials for HER/OER

  The slackened OER kinetics involved in bond breaking of O-H and bond formation of O-O greatly hinders electrochemical water splitting on a larger scale and to address this complication, development of efficient catalysts is highly demanded to effectively couple several protons and electron transfers with low overpotential.

  • Development of the self-humidifying MEA via electrostatic deposition(ESD)

  • High PEMFC performance at low relative humidity by tailoring electrode morphology

  We developed a thin-film, dual-layered concept for the preparation of self-humidifying electrodes that show high water uptake and water-capping behavior over a wide range of relative humidities. The Pt/C-Nafion agglomerate structure differs with organic solvents due to different Nafion mobilities. Thereby, nanosized, dense-structured (NSDS) catalyst layers were prepared by using a catalyst ink containing a solvent with high Nafion mobility. Based on these results, we consider that the proposed thin-film electrode composed of the phase-separated agglomerates will be a key technology to meet the challenging requirements of dehumidified operation. In addition, by completely removing both the external humidifiers and water releasing out at the cathode outlet, this approach could open up new possibilities for the application of PEMFCs for portable applications.

  • High PEMFC performance of ultra-low Pt loaded catalyst layer through the electrostatic spray deposition (ESD) method

  Due to high cost and scarce resource of Pt, numerous researchers have investigated to reduce the Pt loading in the catalyst layer. Although the electrode fabrication in the state-of-the-art PEMFC lowered the mass loading under 0.2 mgPt cm-2, further reduction of Pt is still required to succeed in commercialization. The ESD method is implemented in our lab to fabricate high performance of the catalyst layer with lowered Pt loading. Due to the novel structure of catalyst layer prepared from the ESD, the electrode can present high performance while lowering the Pt loading less than 0.05–0.1 mgPt cm-2.

  • Three-dimensional reconstruction of catalyst layer for PEMFC


Electrochim Acta 211 (2016) 142

  • Three-dimensional reconstruction of catalyst layer for PEMFC

  Besides the development of the macroscopic model, we further focus on reconstruction of the micro/nano structure of electrode materials in order to obtain key pore-structural parameters with a complete consideration of the electrode morphology. We have developed a three-dimensional reconstruction of the catalyst layer by the focused ion beam scanning electron microscope (FIB-SEM) measurement. The proposed method allowed an accurate prediction on pore-size distribution and pore-structural information, e.g., porosity, diffusivity, and tortuosity.

  • Research on the electrocatalysts for the advanced MEAs

  • Electrocatalysts for the oxygen reduction reaction

  Although Pt is a most effective catalyst to facilitate the ORR, the limitations of commercial Pt/C such as activity, stability, and cost, require an advanced nano-materials. Our lab researches on the nanostructured Pt-based and/or non-precious metal catalysts to achieve high ORR activity and stability. The nanostructured Pt-based catalysts have been demonstrated as an effective electrocatalyst to overcome the limitations of nanoparticle-based catalysts. Thereby, the nanostructured Pt-based catalyst can reduce the Pt usage while enhancing the activity. On the other hand, non-precious metal catalysts can reduce or eliminate the required Pt content. In addition, we also research on the hybridization of the nanostructured Pt-based catalysts and non-precious metal catalysts.

Department of Chemical Engineering, Hanyang University, 17 Heangdang-dong Sungdong-gu, Seoul, 133-791, Korea, TEL : +82-2-2220-0481, FAX : +82-2-2298-5147

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