Haipeng Guo

Haipeng Guo
University of Wollongong | UOW · Institute for Superconducting and Electronic Materials

Doctor of Philosophy

About

33
Publications
4,651
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1,433
Citations
Additional affiliations
September 2011 - July 2014
Xiangtan University
Position
  • Master's Student

Publications

Publications (33)
Article
Full-text available
Room-temperature sodium–sulfur (RT Na–S) batteries have attracted extensive attention because of their low cost and high specific energy. RT Na–S batteries, however, usually suffer from sluggish reaction kinetics, low reversible capacity, and short lifespans. Herein, it is shown that chain-mail catalysts, consisting of porous nitrogen doped carbon...
Article
Na-O2 batteries have drawn increasing attention in recent years, owing to their high energy density and the abundance of sodium resources. Their applications still suffer, however, from lack of effective air cathodes to achieve a stable and long cycle life. Herein, we report a nitrogen-doped carbon nanofiber (NCF) material derived from polypyrrole...
Preprint
Full-text available
Sodium-oxygen batteries have been regarded as promising energy storage devices due to their low overpotential and high energy density. Its applications, however, still face formidable challenges due to the lack of understanding about the influence of electrocatalysts on discharge products. Here, a phosphorous and nitrogen dual-doped carbon (PNDC) b...
Article
Exploring economically efficient electrocatalysts with robust bifunctional oxygen conversion catalytic activity and designing appropriate structures are essential to realize ideal zinc-air batteries with high energy density and long lifespan. Two-dimensional metallic state Co3FeN nanosheets with holey-structured architecture are designed and shown...
Article
Over the past few years, great attention has been given to nonaqueous lithium–air batteries owing to their ultrahigh theoretical energy density when compared with other energy storage systems. Most of the research interest, however, is dedicated to batteries operating in pure or dry oxygen atmospheres, while Li–air batteries that operate in ambient...
Article
The interfacial interaction between catalysts and substrates has been considered as a pivotal factor determining the activities in different applications. However, interfacial interaction-dependent catalytic activities are currently neglected in understanding oxygen involved reaction in Li-O2 battery, seriously restricting the development of high p...
Article
Full-text available
Cathodes with high energy density and good structural stability are needed for sodium‐ion batteries (SIBs) to be applied in energy storage field. Herein, a 3D porous skeleton–supported Na3V2(PO4)3/carbon composite (NVP@C‐3DPS) is synthesized via a simple sol–gel method by introducing an appropriate amount of citric acid as organic cross‐linker. The...
Article
Based on an inexhaustible and ubiquitous source of oxygen, the lithium–oxygen batteries are currently the subject of much scientific investigation because of their potential for extremely high energy density. The electrocatalytic materials for them have been extensively researched during the past decade. Even though they are a key component in the...
Article
To develop hierarchical layered cathode materials with high performance is key to further improve advanced lithium-ion batteries, but these systems are challenging to synthesize with controllable shape in large scale. We used a high-shear mixer to continuously prepare flower-like hydroxide precursors via a co-precipitation method in a continuous st...
Article
Rechargeable nonaqueous Li-air batteries are attracting much attention due to their far higher theoretical energy density than lithium-ion batteries. However, Li-air batteries suffers from poor round-trip efficiency, low rate capability and poor cycle life. To reduce charge overpotentials by understanding reaction mechanism and to operate in ambien...
Article
Three-dimensional (3D) hierarchical porous Co3O4 nanotube (Co3O4HPNT) network is prepared by using polypyrrole nanofiber (PPyNF) as a sacrificial template. When employed as cathode for lithium oxygen batteries, the 3D Co3O4 HPNT network demonstrated superior bi-functional electrocatalytic activities towards both the oxygen reduction reaction (ORR)...
Article
Germanium (Ge) is a prospective anode material for lithium-ion batteries, as it possesses large theoretical capacity, outstanding lithium-ion diffusivity, and excellent electrical conductivity. Ge suffers from drastic capacity decay and poor rate performance, however, owing to its low electrical conductivity and huge volume expansion during cycling...
Article
Full-text available
We first report a facile preparation of double-shell pomegranate-like porous carbon microspheres (PCMs) by a modified templating technique. The microsized PCMs are encapsulated with integrate carbon coating layers and composed of interconnected nanosized hollow carbon spheres, giving rise to a special double-shell structure. Calcium carbonate (CaCO...
Article
Transition-metal-doped perovskite oxide LaNi0.9M0.1O3 (M = Cu, Co) nanosheets were grown on nickel foam to serve as a complete carbon- and binder-free three-dimensional (3D) porous air electrode for lithium-oxygen batteries. The design of this porous air electrode can facilitate rapid gas and electrolyte diffusion, as well as form a continuous elec...
Article
Full-text available
The electrochemical mechanism of nanocrystalline silicon anode in sodium ion batteries is first studied via in operando Raman and in operando X-ray diffraction. An irreversible structural conversion from crystalline silicon to amorphous silicon takes place during the initial cycles, leading to ultrafast reversible sodium insertion in the newly gene...
Article
SnO2-coated polypyrrole (PPy) with a three-dimensional (3-D) structured nanotube network has been prepared via a facile hydrothermal method and tested as an anode material for Na-ion batteries. The crystalline SnO2 nanoparticles (less than 25 nm in size) are distributed uniformly on the surfaces of the PPy tubes. When it is used as an anode materia...
Article
Full-text available
Silicon and hematite, both important functional materials with high theoretical capacity, have been intensively investigated separately for application as anode materials in lithium ion batteries (LIBs). The main challenges associated with these anode materials are their low electronic conductivity and structural degradation caused by large volume...
Article
Full-text available
A yolk-shell-structured carbon at void at silicon (CVS) anode material in which a void space is created between the inside silicon nanoparticle and the outer carbon shell is considered as a promising candidate for Li-ion cells. Untill now, all the previous yolk-shell composites were fabricated through a templating method, wherein the SiO2 layer act...
Article
Hierarchical assembly of hollow microstructures is of great scientificity and practical value. In this paper, a hydrothermal synthesis of Li4Ti5O12 hollow microspheres assembled by nanosheets is introduced. Transmission electron microscopy (TEM) image shows that such Li4Ti5O12 microspheres, with sizes of 2 μm in diameter, are composed of a hollow i...
Article
Full-text available
The Li-rich Li1.3[Ni0.35Mn0.65]O2+x microspheres are firstly prepared and subsequently transferred into the Al2O3-coated Li-rich Li1.3[Ni0.35Mn0.65]O2+x microspheres by a simple deposition method. The as-prepared samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic...
Article
Hollow prismatic/cylindric iron fluoride with a wall thickness of 0.1–0.5 μm and a length of 1–3 μm has been synthesized by a simple and mild solvothermal method. This compound with a mixed crystal structure of FeF3·3H2O and FeF3·0.33H2O, has an initial discharge capacities of 106.7 mAh g−1 and a capacity retention of 60% after 100 cycles at the ra...
Article
Anatase FCNTs (functionalized carbon nanotubes)-wired TiO2 nanocomposites have been successfully synthesized via a facile one-pot hydrothermal method. The prepared composites are composed of uniform nanoparticles of TiO2 intimately interconnected by FCNTs networks. FCNTs-wired TiO2 nanocomposites display improved electrochemical performance than ba...
Article
Full-text available
Lithium-rich layered materials, Li1+xM1−xO2 (M = Mn, Ni, Co), have been under intense investigation as high-performance cathode materials for lithium ion batteries due to their high discharge capacity, low cost and environmental benignity. Unfortunately, the practical uses of these oxides have so far been hindered by their severe capacity and volta...
Data
LiV3O8 /polythiophene (LiV3O8 /PTh) composite has been chemically synthesized via an in-situ oxidative polymerization method. The structure and morphology of the samples have been characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and high-resolution transmission electron mic...
Article
FeF3·3H2O, FeF3·0.33H2O, and FeF3 have been synthesized via a liquid-phase method followed by heat treatment at different temperatures. The structure and performance of these iron fluorides have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), selected-area...
Article
Polyaniline–LiV3O8 (PANI–LiV3O8) nanocomposite has been chemically synthesized by an oxidative polymerization. The structure and performance of the sample have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), charge–discharge tests, cyclic voltammetry (CV),...
Article
Fe1−xCoxF3 (x = 0, 0.03, 0.05, 0.07) compounds are synthesized via a liquid-phase method. To further improve their electrochemical properties, a ball milling process with acetylene black (AB) has been used to form Fe1−xCoxF3/C (x = 0, 0.03, 0.05, 0.07) nanocomposites. The structure and performance of the samples have been characterized by X-ray dif...
Article
The electrochemical performance of aqueous rechargeable lithium battery (ARLB) with LiV3O8 as the anode and LiMn2O4 as the cathode in saturated LiNO3 electrolyte is studied. In an attempt to improve the cycle performance of the as-assembled ARLB, coating with NiO nanofibers on the surface of the anode has been proposed via in situ chemical precipit...
Article
An aqueous rechargeable lithium battery (ARLB) consisting of a combination of polyaniline (PANI) anode, LiMn2O4 cathode, and a saturated LiNO3 aqueous electrolyte has been constructed. The charge/discharge process of the battery is associated with the doping/un-doping of anions at the anode and intercalation/deintercalation of lithium ions at the c...
Article
The LiTi2(PO4)3 has been successfully synthesized by a PEG (polyethylene glycol, mean molecular weight of 2000) based sol–gel route at a relative low temperature. For further improve its electrochemical properties, a ball milling process with acetylene black has been used to form LiTi2(PO4)3/C nanocomposite. The samples are characterized by X-ray d...
Article
A triphenylamine-functionalized ternary europium(III) complex of Eu(DBM)3(DTPA-Phen), in which DTPA-Phen is 3,8-bis[4-(diphenylamino)phenyl]-1,10-phenanthroline and DBM is dibenzoylmethanato, was designed, synthesized and characterized. This complex emits the characteristic red emission of trivalent europium ion due to the 5D0 → 7Fj (j = 0−4) trans...
Article
A series of bipolar-transporting europium(III) complexes containing carbazole and oxadiazole units were synthesized and characterized. Two intense UV absorption bands at around 286nm and 352nm, and sharply red emissions peaked at 614nm were observed for these europium complexes in dichloromethane. Importantly, the bipolar-transporting europium(III)...

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Project (1)
Project
Improve the electrochemical performance