Research Interests

Here, a brief story about our current research topics in “Health” and “Energy” area is presented. More details can be found in introduced text books or review papers on each page.

Light Trapping in Branched Nanostructure Semiconductors

One‐dimensional nanostructures including nanowires (NWs), nanotubes, and nanofibers have shown promising PEC solar water splitting performance owing to their enhanced light absorption, higher surface area, reduced carrier recombination, and improved charge collection efficiency compared to their bulk counterparts. However, one‐dimensional structures still show insufficient specific surface area for water‐splitting reaction compared to mesoporous films. The hierarchically branched nanorod structure is a model architecture for efficient PEC application because it simultaneously offers a large seminconductor/electrolyte contact, excellent light‐trapping characteristics, and a highly conductive pathway for charge‐carrier collection. For example, branched TiO2 and ZnO nanorod arrays have been constructed exhibiting superior PEC …
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Earth Abundant Electro-catalysts for Red/Ox Reactions

Considering the depletion of hydrocarbon reservoirs and adverse effects of their combustion, providing a renewable and environmentally friendly resource of energy is necessary for human societies. Photoelectrochemical (PEC) and electrochemical (EC) water splitting into O2 and H2 at the surface of a proper material (photoactive semiconductor or electrocatalysts) is a promising solution to produce solar fuel as a green and sustainable source of energy. In both these approaches, each half-reaction, oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), must be optimized to achieve the highest efficiency. The challenging step is the OER since its Gibbs free energy is 1.23 …
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Solar Hydrogen Production From Water

The alarming depletion rate of reserved fossil fuel associated with rapid increase in environmental pollution has caused an urgent need to develop efficient clean and renewable energy resources. In this regard, many different approaches have been followed up. The sun is a free, clean, sustainable and easy access energy source, and the solar produced hydrogen, which can be used in fuel cells to generate electricity or changed directly in combustion engines, makes no pollution except water. Hence, to obtain hydrogen as a clean energy carrier, the scenario of a renewable hydrogen economy has attracted much attention from researchers recently. Because …
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2D Nanomaterials for Catalytic Reactions

The 2D materials are generally composed of strong covalent bonds leading to in-plane stability and weak van der Waals bonds, which sustain the stacked layer structure. Following the discovery of graphene in 2004, a new horizon has opened up for exploring other 2D layered materials such as transition metal dichalcogenides (TMD), transition metal oxides, graphitic carbon nitride (GCN), and hexagonal boron nitride (h-BN). These 2D materials can be integrated with a three dimensional (3D) SC material as a new building block to fabricate interfacial heterostructures. The electrocatalytic activity of this material strongly depends on its quality and morphology. For instance, defects and …
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Nanomaterials for Energy Storage Applications

Supercapacitor devices, also known as electrical double-layer capacitors (EDLCs), store charge by adsorption of electrolyte ions onto the surface of electrode. No redox reactions are required, so the response to changes in potential without diffusion limitations is rapid and leads to high power. However, the charge is confined to the surface, so the energy density of EDLCs is less than that of batteries. In the 1970s, Conway and others recognized that reversible redox reactions occurring at or near the surface of an appropriate electrode material lead to EDLC-like electrochemical features but the redox processes lead to much greater charge storage …
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New Antibiotics Against Resistant Bacteria

A particularly alarming issue in world health today is the rise and prevalence of antibiotic-resistant bacteria, which significantly increases death rates and costs of treatment; and a group of pathogens responsible for the majority of hospital acquired infections – commonly referred to as the ‘ESKAPE’ pathogens (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter species) – have been named as one of the biggest threats to health as a result of their multidrug resistance. On 27 February 2017, WHO published list of bacteria for which new antibiotics are urgently needed. Although the Gram-positive bacteria in the ESKAPE …
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Photo/Electrochemical Sensing of Bio-analytes

Sensitive and selective target capture, recognition, and signal transduction in detection of chemical and biological molecules is essential for fundamental biomedical studies, disease diagnosis, and drug screening. To achieve fast, sensitive, large-scale, and low-cost molecular analysis, a wide variety of detection technologies such as fluorescent, spectroscopic, electrical, magnetic and mechanical methods have been developed. The photoelectrochemical (PEC) approach is a recently developed one for biomolecular analysis. The basic principle of PEC is the photo-to-electric conversion of a semiconducting material, phot-excited electrons or holes are transferred to proper sites to initiate redox reactions. This photon-to-charge conversion process is highly sensitive to …
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