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31.发明申请公开(公告)号：US20200347501A1
公开(公告)日：2020-11-05
申请号：US16401793
申请日：2019-05-02
Inventor： Muhammad Ali EHSAN , Abdul REHMAN
Abstract: A CaTiO3—TiO2 composite electrode and method of making is described. The composite electrode comprises a substrate with an average 2-12 μm thick layer of CaTiO3—TiO2 composite particles having average diameters of 0.2-2.2 μm. The method of making the composite electrode involves contacting the substrate with an aerosol comprising a solvent, a calcium complex, and a titanium complex. The CaTiO3—TiO2 composite electrode is capable of being used in a photoelectrochemical cell for water splitting.
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公开(公告)号：US20200270757A1
公开(公告)日：2020-08-27
申请号：US16285370
申请日：2019-02-26
Inventor： Muhammad Ali EHSAN , Md. Abdul AZIZ , Abbas Saeed HAKEEM
Abstract: A synthetic methodology for robust, nanostructured films of cobalt oxide over metal evaporated gold or similar material layer of, e.g., 50 nm, directly onto glass or other substrates via aerosol assisted chemical vapor deposition (AACVD). This approach allows film growth rates in the range of, e.g., 0.8 nm/s, using a commercially available precursor, which is ˜10-fold the rate of electrochemical synthetic routes. Thus, 250 nm thick cobalt oxide films may be generated in only 5 minutes of deposition time. The water oxidation reaction for such films may start at ˜0.6 V vs Ag/AgCl with current density of 10 mA/cm2 and is achieved at ˜0.75 V corresponding to an overpotential of 484 mV. This current density is further increased to 60 mA/cm2 at ˜1.5 V (vs Ag/AgCl). Electrochemically active surface area (ECSA) calculations indicate that the synergy between a Au-film, acting as electron sink, and the cobalt oxide film(s), acting as catalytic layer(s), are more pronounced than the surface area effects.
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公开(公告)号：US20190330116A1
公开(公告)日：2019-10-31
申请号：US16507117
申请日：2019-07-10
Inventor： Abbas Saeed HAKEEM , Tahar LAOUI , Hafiz Muzammil IRSHAD , Bilal Anjum AHMED , Muhammad Ali EHSAN
IPC: C04B35/117 , C04B35/103 , C04B35/628 , C22C29/12 , C04B35/64
Abstract: Conventional sintering processes convert a portion of cBN to hBN which is softer than cBN which negatively affects functional properties of an alumina composite. The invention is directed to method for making an alumina-cubic boron nitride (Al2O3-cBN) composite that contains substantially no hexagonal boron nitride (hBN) by non-conventional spark plasma sintering of cBN with nano-sized alumina particles. The invention is also directed to Al2O3-cBN/Ni composites, which contain substantially no hBN, and which exhibit superior physical and mechanical properties compared to alumina composites containing higher amounts of hBN.
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34.发明申请公开(公告)号：US20190119166A1
公开(公告)日：2019-04-25
申请号：US15788914
申请日：2017-10-20
Inventor： Abbas Saeed HAKEEM , Tahar LAOUI , Hafiz Muzammil IRSHAD , Bilal Anjum AHMED , Muhammad Ali EHSAN
IPC: C04B35/117 , C04B35/103 , C04B35/64 , C04B35/628
CPC classification number: C04B35/117 , C04B35/103 , C04B35/62842 , C04B35/64 , C04B2235/3217 , C04B2235/386 , C04B2235/405 , C04B2235/5436 , C04B2235/5445 , C04B2235/5454 , C04B2235/6562 , C04B2235/666 , C04B2235/96 , C04B2235/9607 , C22C29/12 , C22C2026/003
Abstract: Conventional sintering processes convert a portion of cBN to hBN which is softer than cBN which negatively affects functional properties of an alumina composite. The invention is directed to method for making an alumina-cubic boron nitride (Al2O3-cBN) composite that contains substantially no hexagonal boron nitride (hBN) by non-conventional spark plasma sintering of cBN with nano-sized alumina particles. The invention is also directed to Al2O3-cBN/Ni composites, which contain substantially no hBN, and which exhibit superior physical and mechanical properties compared to alumina composites containing higher amounts of hBN.
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