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High-speed and multiscale reaction flows Additive Manufacturing with different materials and processes Thin and well tunable electrodes with  ultrahigh catalyst mass activity in water splitting Thin/well-tunable liquid/gas diffusion layers exhibiting superior multifunctional performance for hydrogen production in low-temperature electrolytic water splitting Modeling and simulation of multiphase transport, interfacial effects and electrochemical performance Stainless steel corrosions Corrosion formation on carbon fiber Corrosion quantification with X-ray diffraction Corrosion quantification with High-speed and micro-scale visualization In-situ micro-scale transport, mixing and reaction Ex-situ micro-scale transport in porous media Micro mixer and reaction chamber Surface control and material/device development based on MEMS/NEMS Quantitative characterization of nano-composite material Laser absorption computerized tomography Pulse detonation engines Interface and impedance analysis,  and performance  improvements High-speed and multiscale reaction flows. (A) Electrochemical reactions in the PEMEC microchannel. (B) 600 µm triangular opening. (C) 400 µm triangular opening. (D) 500 µm circular opening. (E) 50 µm circular opening. (Click below to see video clips) Back to top of page Additive Manufacturing with different materials and processes. (A) Titanium liquid/gas diffusion layer by electron-beam melting, (B) Stainless steel bipolar plate by selective laser melting, (C) Nonmetallic airplane by binder-jetting prototype, (D) Circuits/sensors by direct printing. Back to top of page Thin and well tunable electrodes with  ultrahigh catalyst mass activity in water splitting Back to top of page Thin/well-tunable liquid/gas diffusion layers exhibiting superior multifunctional performance for hydrogen production in low-temperature electrolytic water splitting Back to top of page Modeling and simulation of multiphase transport, interfacial effects and electrochemical performance Back to top of page In-situ micro-scale transport, mixing and reaction. (a) in flow channel and on GDL; (b) in GDL; (c) on catalyst layer and reaction site Back to top of page Ex-situ micro-scale transport in porous media. (a) in hydrophobic; (b) in hydrophilic Back to top of page Micro mixer and reaction chamber. Mixing within less than 0.5 mm in active mixer (left), while no mixing observed in passive mixer (right) Back to top of page Surface control and material/device development based on MEMS/NEMS. (a) Mocular selef-assembled monolayer (SAM); (b)Top-down/etching; (c) Bottom-up/deposition Back to top of page Quantitative characterization of nano-composite material. (a) by x-ray photoelectron  spectroscopy and electron microscopy; (b) x-ray diffraction Back to top of page Laser absorption computerized tomography Back to top of page Pulse detonation engines at operating frequency of up to 32 Hz with air/H2. The image shows the wave out of engine exit Back to top of page Characterizations of PEM water electrolyzers with different materials: (A) Performance; (B) Electrochemical impedance spectroscopy; (C) EIS equivalent electrical circuit model Back to top of page SEM  images of stainless steel corrosions, (A) fresh sample; (B) used sample; (C) Close-up of (B). Back to top of page SEM images of corrosion deposition on carbon fiber, (A) fresh sample; (B) used sample; (C) Close-up of (B). Back to top of page Quantitifying corrosions with XRD: (A) fresh sample; (B) used sample Back to top of page Corrosion quantification with High-speed and micro-scale visualization Back to top of page