Tohoku University · Energy
Professor Xiao Zhang's research lab specializes in the design and fabrication of advanced functional nanomaterials for sustainable energy and environmental applications. The lab focuses on developing novel heterostructures, such as Z-scheme and type II heterojunctions based on graphitic carbon nitride (g-C₃N₄) and perovskite materials, to enhance photocatalytic efficiency in hydrogen production and CO₂ reduction. A key research direction involves innovative nanoarchitectonics strategies, including edge-epitaxial growth and core-shell structuring, to achieve precise control over material morphology and electronic properties. The lab also investigates surface engineering techniques—such as silica coating and ligand exchange—to improve the stability and performance of perovskite nanocrystals and other sensitive nanomaterials.
Figures are computed from collected data and may differ slightly.
This study presents a combined parameter and state estimation algorithm for a bilinear system described by its observer canonical state‐space model based on the hierarchical identification principle. The Kalman filter is known as the best state filter for linear systems, but not applicable for bilinear systems. Thus, a bilinear state observer (BSO) is designed to give the state estimates using the extremum principle. Then a BSO‐based recursive least squares (BSO‐RLS) algorithm is developed. For
Construction of Z-scheme heterojunctions has been considered one superb method in promoting solar-assisted charge carrier separation of carbon-based materials to achieve efficient utilization of solar energy in hydrogen production and CO<sub>2</sub> reduction. One interesting concept in nanofabrication that has become trend recent years is nanoarchitectonics. A heterostructure photocatalyst constructed based on the idea of nanoarchitectonics using the combination of g-C<sub>3</sub>N<sub>4</sub>,
g-C<sub>3</sub>N<sub>4</sub> has been used as a photocatalyst to overcome the issues of environmental crises and energy shortages. Here, red g-C<sub>3</sub>N<sub>4</sub> nanosheets (E<sub>g</sub>: ∼ 1.89 eV) were used as seeds for the edge-epitaxial growth of yellow g-C<sub>3</sub>N<sub>4</sub> (E<sub>g</sub>: ∼ 2.59 eV) to form type II heterostructures. The heterostructures revealed superior photocatalytic activity for enhanced H<sub>2</sub> (3996 μmol g<sup>-1</sup> h<sup>-1</sup>), CO (3.8 μm
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