hongze luo - Academia.edu (original) (raw)

Papers by hongze luo

Clinical and Experimental Obstetrics & Gynecology, 2017

The authors report management of a woman with an acardiac twin pregnancy complicated by preterm p... more The authors report management of a woman with an acardiac twin pregnancy complicated by preterm premature rupture of the membrane (PPROM) for more than two months after intrauterine treatment with bipolar cord coagulation at 24 weeks of gestation.

Surface Innovations, 2017

Journal of Physics and Chemistry of Solids, 2022

Spinel Li4Ti5O12 has become an alternative material to replace graphite anodes in terms of solvin... more Spinel Li4Ti5O12 has become an alternative material to replace graphite anodes in terms of solving safety issues and improving battery life-time. Unfortunately, as Li4Ti5O12 is an insulator, the low electrical conductivity becomes a major drawback, as it is unfavorable to higher rate capability. In addition to the low electronic conductivity, severe gassing during charge/discharge cycles is a critical but often-overlooked problem of Li4Ti5O12 batteries. Li4Ti5O12/C microspheres were prepared by assembling the nanoLi4Ti5O12 (50–300 nm) with pitch derived pyrolytic carbon. It was found that the coated carbon in Li4Ti5O12/C microspheres can effectively inhibit gassing and Mn deposition in LiMn2O4//Li4Ti5O12 battery. Carbon can also significantly improve rate capability and cycling performance compared with that of Li4Ti5O12 microspheres without carbon due to stable interface and superior electronic conductivity. © The Author(s) 2014. Published by ECS. This is an open access article dis...

ECS Meeting Abstracts, 2014

ECS Meeting Abstracts, 2010

not Available.

ECS Meeting Abstracts, 2010

... on Fluorine Doped SWCNT Template: A Novel and Smart Electrode Material for Li-Ion Battery. [E... more ... on Fluorine Doped SWCNT Template: A Novel and Smart Electrode Material for Li-Ion Battery. [ECS Meeting Abstracts 1003, 603 (2010)]. Bolade O. Agboola, HongzeLuo, Kenneth I. Ozoemena, Lukas Le Roux, Mkhulu Mathe.

Journal of The Electrochemical Society, 2016

Spinel Li 4 Ti 5 O 12 has been considered as a promising anode material to substitute graphite in... more Spinel Li 4 Ti 5 O 12 has been considered as a promising anode material to substitute graphite in lithium ion batteries (LIBs) for large scale electrical energy storage due to its high safety and long cycling stability. However, the drawback of its poor rate performance still hinders it from wide practical application. In this study, with the aim to solve this issue, we have designed a wrinkled graphene layer between the active spinel Li 4 Ti 5 O 12 and aluminum current collectors by a blade coating method. This introduced wrinkled graphene layer provides larger contact area, lower contact resistance, stronger adhesion and better electrode stability of Li 4 Ti 5 O 12 electrode. As a result, the rate performance of spinel Li 4 Ti 5 O 12 has been significantly improved, without compromising its other properties.

6th International Conference of the Africa Materials Research Society, Victoria Falls, Zimbabwe, ... more 6th International Conference of the Africa Materials Research Society, Victoria Falls, Zimbabwe, 11-16 December 2011

ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology, 2009

The proton conducting membrane was prepared by cross-linking highly sulfonated and sulfinated pol... more The proton conducting membrane was prepared by cross-linking highly sulfonated and sulfinated poly(etheretherketone) (SsPEEK). The cross-linked membrane is low cost due to its use of non-expensive chemical and simple production procedure. The membrane exhibited high proton conductivity (0.04 S/cm at 60 °C), extremely reduced water uptake, enhanced strength and stability compared with that of non-cross-linked membrane. These results suggested that the cross-linked PEEK membrane is a suitable candidate of proton conducting membranes for polymer electrolyte membrane fuel cell (PEMFC) applications, particularly promising to be used in direct methanol fuel cell (DMFC) due to its lower methanol crossover.

The proton conducting membrane, usually termed "proton exchange membrane" is one key component of... more The proton conducting membrane, usually termed "proton exchange membrane" is one key component of the direct methanol fuel cell (DMFC). For a direct methanol fuel cell (DMFC), the proton exchange membrane must conduct protons and be a good methanol barrier. Currently the membranes most referred to are DuPont's Nafion ®. The high cost of the DMFC components, and high methanol crossover, are the main issues preventing its commercialisation and DMFC performance. The main objective of this study was thus to prepare highly proton conductive membranes that are cheap to manufacture and have low methanol permeability. Two different kinds of membranes (composite and cross-linked) based on poly(etheretherketone) (PEEK) have been developed and studied in this thesis. Chapter 3 and Chapter 4 respectively present those two membranes, different but relatively based on poly(etheretherketone) (PEEK). In Chapter 3, SPEEK/phosphorized zirconium oxide nano-particles (ZP) composite membranes were prepared by incorporating various ratios of ZP into SPEEK. SPEEK/ZP membranes showed many improved properties compared with that of pure SPEEK. Key amongst these are increased proton conductivity, reduced water uptake and the 28 % methanol permeability reduction of a membrane with 5 wt.% of ZP compared with that of SPEEK membrane, it is 12 times lower than that of Nafion ® 117. SPEEK/ZP composite membrane with low incorporated ZP content is considered for DMFC application. Chapter 4 presents a novel type of cross-kinked membrane which prepared by an original and simple method. The membranes are highly conductive, low methanol permeable and stable, cheap and easy to prepare.

The proton exchange membrane (PEM) is one key component of direct methanol fuel cells (DMFCs), wh... more The proton exchange membrane (PEM) is one key component of direct methanol fuel cells (DMFCs), which has double functions of conducting protons, separating fuels and oxidant. At present, the performance and price of sulfonic acid PEMs used in DMFCs are deeply concerned. In order to reduce membrane's cost and improve performance of Nafion membrane, three different kinds of membranes have been studied in this thesis. Chapter 3, Chapter 4 and Chapter 5 present those three different but related types of membranes, respectively. In Chapter 3, sulfonated poly(ether ether ketone) (SPEEK) was synthesized by sulfonating poly(ether ether ketone) with 98% sulfuric acid. SPEEK membranes possess good thermal stability and mechanical properties, low methanol permeability (P = 4.00×10 −9 cm 2 /s at DS = 0.30) and the proton conductivity (σ = 2.5 × 10 −2 S/cm at DS = 0.82). The proton conductivity of the SPEEK membranes, water uptake and methanol permeability were increased with increasing DS and temperature. In Chapter 4, SPEEK/phosphorized zirconium oxide nano-particles (ZP) composite membranes were prepared by incorporating various ratios of ZP into SPEEK. SPEEK/ZP membranes showed many improved properties.

The low-cost cross-linked Polyetheretherketone (PEEK) proton exchange membranes were prepared via... more The low-cost cross-linked Polyetheretherketone (PEEK) proton exchange membranes were prepared via the simple route. The membranes exhibited similar electrochemical properties as compared with commercial Nafion ®. The membranes were highly proton conductive, mechanically and chemically stable. They showed reduced water uptake and reduced methanol crossover. Figure 1: The single DMFC performance of a cross-linked membrane vs. Nafion ® 117 The membrane was applied in a direct methanol fuel cell (DMFC) and a considerable performance improvement was found as compared to commercial Nafion ® 117 membrane. These results suggested that the prepared cross-linked membrane is a suitable candidate for the polymer electrolyte membrane fuel cell (PEMFC) application.

Nanomaterials in Advanced Batteries and Supercapacitors, 2016

Lithium-manganese-rich cathode material Li1.2Mn0.54Ni0.13Co0.13O2 is prepared by combustion metho... more Lithium-manganese-rich cathode material Li1.2Mn0.54Ni0.13Co0.13O2 is prepared by combustion method, and then coated with nano-sized LiFePO4 and nano-sized Al2O3 particles via a wet chemical process. The as-prepared Li1.2Mn0.54Ni0.13Co0.13O2, LiFePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2 and Al2O3-coated Li1.2Mn0.54Ni0.13Co0.13O2 are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The scanning electron microscopy shows the agglomeration of the materials and their nanoparticle size which ranges between 80 100 nm. The transmission electron microscopy confirmed that LiFePO4 forms a rough mat-like surface and Al2O3 remain as islandic particles on the surface of the Li1.2Mn0.54Ni0.13Co0.13O2 material. The Li1.2Mn0.54Ni0.13Co0.13O2 coated with LiFePO4 and Li1.2Mn0.54Ni0.13Co0.13O2 coated with Al2O3 exhibits improved electrochemical performance. The initial discharge capacity is enhanced to 267 mAhg after the LiFePO4 coating and 285 mAhg aft...

Clinical and Experimental Obstetrics & Gynecology, 2017

The authors report management of a woman with an acardiac twin pregnancy complicated by preterm p... more The authors report management of a woman with an acardiac twin pregnancy complicated by preterm premature rupture of the membrane (PPROM) for more than two months after intrauterine treatment with bipolar cord coagulation at 24 weeks of gestation.

Surface Innovations, 2017

Journal of Physics and Chemistry of Solids, 2022

Spinel Li4Ti5O12 has become an alternative material to replace graphite anodes in terms of solvin... more Spinel Li4Ti5O12 has become an alternative material to replace graphite anodes in terms of solving safety issues and improving battery life-time. Unfortunately, as Li4Ti5O12 is an insulator, the low electrical conductivity becomes a major drawback, as it is unfavorable to higher rate capability. In addition to the low electronic conductivity, severe gassing during charge/discharge cycles is a critical but often-overlooked problem of Li4Ti5O12 batteries. Li4Ti5O12/C microspheres were prepared by assembling the nanoLi4Ti5O12 (50–300 nm) with pitch derived pyrolytic carbon. It was found that the coated carbon in Li4Ti5O12/C microspheres can effectively inhibit gassing and Mn deposition in LiMn2O4//Li4Ti5O12 battery. Carbon can also significantly improve rate capability and cycling performance compared with that of Li4Ti5O12 microspheres without carbon due to stable interface and superior electronic conductivity. © The Author(s) 2014. Published by ECS. This is an open access article dis...

ECS Meeting Abstracts, 2014

ECS Meeting Abstracts, 2010

not Available.

ECS Meeting Abstracts, 2010

... on Fluorine Doped SWCNT Template: A Novel and Smart Electrode Material for Li-Ion Battery. [E... more ... on Fluorine Doped SWCNT Template: A Novel and Smart Electrode Material for Li-Ion Battery. [ECS Meeting Abstracts 1003, 603 (2010)]. Bolade O. Agboola, HongzeLuo, Kenneth I. Ozoemena, Lukas Le Roux, Mkhulu Mathe.

Journal of The Electrochemical Society, 2016

Spinel Li 4 Ti 5 O 12 has been considered as a promising anode material to substitute graphite in... more Spinel Li 4 Ti 5 O 12 has been considered as a promising anode material to substitute graphite in lithium ion batteries (LIBs) for large scale electrical energy storage due to its high safety and long cycling stability. However, the drawback of its poor rate performance still hinders it from wide practical application. In this study, with the aim to solve this issue, we have designed a wrinkled graphene layer between the active spinel Li 4 Ti 5 O 12 and aluminum current collectors by a blade coating method. This introduced wrinkled graphene layer provides larger contact area, lower contact resistance, stronger adhesion and better electrode stability of Li 4 Ti 5 O 12 electrode. As a result, the rate performance of spinel Li 4 Ti 5 O 12 has been significantly improved, without compromising its other properties.

6th International Conference of the Africa Materials Research Society, Victoria Falls, Zimbabwe, ... more 6th International Conference of the Africa Materials Research Society, Victoria Falls, Zimbabwe, 11-16 December 2011

ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology, 2009

The proton conducting membrane was prepared by cross-linking highly sulfonated and sulfinated pol... more The proton conducting membrane was prepared by cross-linking highly sulfonated and sulfinated poly(etheretherketone) (SsPEEK). The cross-linked membrane is low cost due to its use of non-expensive chemical and simple production procedure. The membrane exhibited high proton conductivity (0.04 S/cm at 60 °C), extremely reduced water uptake, enhanced strength and stability compared with that of non-cross-linked membrane. These results suggested that the cross-linked PEEK membrane is a suitable candidate of proton conducting membranes for polymer electrolyte membrane fuel cell (PEMFC) applications, particularly promising to be used in direct methanol fuel cell (DMFC) due to its lower methanol crossover.

The proton conducting membrane, usually termed "proton exchange membrane" is one key component of... more The proton conducting membrane, usually termed "proton exchange membrane" is one key component of the direct methanol fuel cell (DMFC). For a direct methanol fuel cell (DMFC), the proton exchange membrane must conduct protons and be a good methanol barrier. Currently the membranes most referred to are DuPont's Nafion ®. The high cost of the DMFC components, and high methanol crossover, are the main issues preventing its commercialisation and DMFC performance. The main objective of this study was thus to prepare highly proton conductive membranes that are cheap to manufacture and have low methanol permeability. Two different kinds of membranes (composite and cross-linked) based on poly(etheretherketone) (PEEK) have been developed and studied in this thesis. Chapter 3 and Chapter 4 respectively present those two membranes, different but relatively based on poly(etheretherketone) (PEEK). In Chapter 3, SPEEK/phosphorized zirconium oxide nano-particles (ZP) composite membranes were prepared by incorporating various ratios of ZP into SPEEK. SPEEK/ZP membranes showed many improved properties compared with that of pure SPEEK. Key amongst these are increased proton conductivity, reduced water uptake and the 28 % methanol permeability reduction of a membrane with 5 wt.% of ZP compared with that of SPEEK membrane, it is 12 times lower than that of Nafion ® 117. SPEEK/ZP composite membrane with low incorporated ZP content is considered for DMFC application. Chapter 4 presents a novel type of cross-kinked membrane which prepared by an original and simple method. The membranes are highly conductive, low methanol permeable and stable, cheap and easy to prepare.

The proton exchange membrane (PEM) is one key component of direct methanol fuel cells (DMFCs), wh... more The proton exchange membrane (PEM) is one key component of direct methanol fuel cells (DMFCs), which has double functions of conducting protons, separating fuels and oxidant. At present, the performance and price of sulfonic acid PEMs used in DMFCs are deeply concerned. In order to reduce membrane's cost and improve performance of Nafion membrane, three different kinds of membranes have been studied in this thesis. Chapter 3, Chapter 4 and Chapter 5 present those three different but related types of membranes, respectively. In Chapter 3, sulfonated poly(ether ether ketone) (SPEEK) was synthesized by sulfonating poly(ether ether ketone) with 98% sulfuric acid. SPEEK membranes possess good thermal stability and mechanical properties, low methanol permeability (P = 4.00×10 −9 cm 2 /s at DS = 0.30) and the proton conductivity (σ = 2.5 × 10 −2 S/cm at DS = 0.82). The proton conductivity of the SPEEK membranes, water uptake and methanol permeability were increased with increasing DS and temperature. In Chapter 4, SPEEK/phosphorized zirconium oxide nano-particles (ZP) composite membranes were prepared by incorporating various ratios of ZP into SPEEK. SPEEK/ZP membranes showed many improved properties.

The low-cost cross-linked Polyetheretherketone (PEEK) proton exchange membranes were prepared via... more The low-cost cross-linked Polyetheretherketone (PEEK) proton exchange membranes were prepared via the simple route. The membranes exhibited similar electrochemical properties as compared with commercial Nafion ®. The membranes were highly proton conductive, mechanically and chemically stable. They showed reduced water uptake and reduced methanol crossover. Figure 1: The single DMFC performance of a cross-linked membrane vs. Nafion ® 117 The membrane was applied in a direct methanol fuel cell (DMFC) and a considerable performance improvement was found as compared to commercial Nafion ® 117 membrane. These results suggested that the prepared cross-linked membrane is a suitable candidate for the polymer electrolyte membrane fuel cell (PEMFC) application.

Nanomaterials in Advanced Batteries and Supercapacitors, 2016

Lithium-manganese-rich cathode material Li1.2Mn0.54Ni0.13Co0.13O2 is prepared by combustion metho... more Lithium-manganese-rich cathode material Li1.2Mn0.54Ni0.13Co0.13O2 is prepared by combustion method, and then coated with nano-sized LiFePO4 and nano-sized Al2O3 particles via a wet chemical process. The as-prepared Li1.2Mn0.54Ni0.13Co0.13O2, LiFePO4-coated Li1.2Mn0.54Ni0.13Co0.13O2 and Al2O3-coated Li1.2Mn0.54Ni0.13Co0.13O2 are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The scanning electron microscopy shows the agglomeration of the materials and their nanoparticle size which ranges between 80 100 nm. The transmission electron microscopy confirmed that LiFePO4 forms a rough mat-like surface and Al2O3 remain as islandic particles on the surface of the Li1.2Mn0.54Ni0.13Co0.13O2 material. The Li1.2Mn0.54Ni0.13Co0.13O2 coated with LiFePO4 and Li1.2Mn0.54Ni0.13Co0.13O2 coated with Al2O3 exhibits improved electrochemical performance. The initial discharge capacity is enhanced to 267 mAhg after the LiFePO4 coating and 285 mAhg aft...