All Publications

  • Using resonant energy X-ray diffraction to extract chemical order parameters in ternary semiconductors JOURNAL OF MATERIALS CHEMISTRY C Schnepf, R. R., Levy-Wendt, B. L., Tellekamp, M., Ortiz, B. R., Melamed, C. L., Schelhas, L. T., Stone, K. H., Toney, M. F., Toberer, E. S., Tamboli, A. C. 2020; 8 (13): 4350–56

    View details for DOI 10.1039/c9tc06699c

    View details for Web of Science ID 000526890100036

  • Modified Micro-Emulsion Synthesis of Highly Dispersed Al/PVDF Composites with Enhanced Combustion Properties ADVANCED ENGINEERING MATERIALS Huang, S., Pan, M., Deng, S., Jiang, Y., Zhao, J., Levy-Wendt, B., Tang, S. Y., Zheng, X. 2019; 21 (5)
  • Resolving Hysteresis in Perovskite Solar Cells with Rapid Flame-Processed Cobalt-Doped TiO2 ADVANCED ENERGY MATERIALS Kim, J., Chai, S., Ji, Y., Levy-Wendt, B., Kim, S., Yi, Y., Heinz, T. F., Norskov, J. K., Park, J., Zheng, X. 2018; 8 (29)
  • Rapid Formation of a Disordered Layer on Monoclinic BiVO4: Co-Catalyst-Free Photoelectrochemical Solar Water Splitting CHEMSUSCHEM Kim, J., Cho, Y., Jeong, M., Levy-Wendt, B., Shin, D., Yi, Y., Wang, D., Zheng, X., Park, J. 2018; 11 (5): 933–40


    A surface disordered layer is a plausible approach to improve the photoelectrochemical performance of TiO2 . However, the formation of a crystalline disordered layer in BiVO4 and its effectiveness towards photoelectrochemical water splitting has remained a big challenge. Here, we report a rapid solution process (within 5 s) that is able to form a disordered layer of a few nanometers thick on the surface of BiVO4 nanoparticles using a specific solution with a controllable reducing power. The disordered layer on BiVO4 alleviates charge recombination at the electrode-electrolyte interface and reduces the onset potential greatly, which in turn results in a photocurrent density of approximately 2.3 mA cm-2 at 1.23 V versus the reversible hydrogen electrode (RHE). This value is 2.1 times higher than that of bare BiVO4 . The enhanced photoactivity is attributed to the increased charge separation and transfer efficiencies, which resolve the intrinsic drawbacks of bare BiVO4 such as the short hole diffusion length of around 100 nm and poor surface oxygen evolution reactivity.

    View details for PubMedID 29274301

  • Encapsulation of Single Nanoparticle in Fast-Evaporating Micro-droplets Prevents Particle Agglomeration in Nanocomposites ACS APPLIED MATERIALS & INTERFACES Pan, M., Shi, X., Lyu, F., Levy-Wendt, B., Zheng, X., Tang, S. Y. 2017; 9 (31): 26602–9


    This work describes the use of fast-evaporating micro-droplets to finely disperse nanoparticles (NPs) in a polymer matrix for the fabrication of nanocomposites. Agglomeration of particles is a key obstacle for broad applications of nanocomposites. The classical approach to ensure the dispersibility of NPs is to modify the surface chemistry of NPs with ligands. The surface properties of NPs are inevitably altered, however. To overcome the trade-off between dispersibility and surface-functionality of NPs, we develop a new approach by dispersing NPs in a volatile solvent, followed by mixing with uncured polymer precursors to form micro-droplet emulsions. Most of these micro-droplets contain no more than one NP per drop, and they evaporate rapidly to prevent the agglomeration of NPs during the polymer curing process. As a proof of concept, we demonstrate the design and fabrication of TiO2 NP@PDMS nanocomposites for solar fuel generation reactions with high photocatalytic efficiency and recyclability arising from the fine dispersion of TiO2. Our simple method eliminates the need for surface functionalization of NPs. Our approach is applicable to prepare nanocomposites comprising a wide range of polymers embedded with NPs of different composition, sizes, and shapes. It has the potential for creating nanocomposites with novel functions.

    View details for PubMedID 28704029