Jia Ming Ang

Nanyang Technological University

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Xuehong Lu

Nanyang Technological University

Chenyang Zhao

National Engineering Research Center for Wheat

Junhua Kong

Institute of Materials Research and Engineering

Youfang Zhang

Hubei University

Zhihui Zeng

Shandong University

Liping Yang

Wangjing Hospital of China Academy of Chinese Medical Sciences

Si Lei Phua

Nanyang Technological University

Bing Feng Ng

Nanyang Technological University

Man Pun Wan

Qingdao University of Technology

Yonghua Du

Brookhaven National Laboratory

Cooperative Institutions

Nanyang Technological University

Agency for Science, Technology and Research

Singapore Polytechnic

Institute of Materials Research and Engineering

National University of Singapore

University of Chinese Academy of Sciences

Institute of Chemical and Engineering Sciences

Dalian University of Technology

Shenzhen University

Chinese Academy of Sciences

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Highly porous polymer nanofibrous aerogels cross-linked via spontaneous inter-fiber stereocomplexation and their potential for capturing ultrafine airborne particles

Polymer (2019)

Xiu Yun Daphne Jia Ming Ang Youfang Zhang Zhihui Zeng Chenyang Zhao

Electrospinning

10.1016/j.polymer.2019.121649

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Citations (26)

Hybrid materials derived from polydopamine-transition metal complexes : formation mechanism and electrocatalytic functions

Jia Ming Ang

In this PhD study, polydopamine (PDA)-transition metal hybrids synthesized via in situ polymerization of dopamine (DOPA) with the presence of transition metal species are studied.Iron(III) ions and cobalt(II) ions were chosen as the model systems used for this PhD study.Substantial efforts have been devoted to understand the interactions between DOPA/PDA and iron(III)/cobalt(II) ions, and the effects of the transition metal ions on oxidation polymerization and self-assembly behaviours of the hybrids.For the iron(III) ions system, it was found that the oxidative polymerization of dopamine and Fe(III)-PDA complexation co-contributed to the in situ "polymerization" process.During the polymerization process, the morphology of the complex nanostructure transformed from sheet-like to spherical due to the decrease in hydrophilic groups caused by the covalent polymerization, resulting in re-selfassembly of the PDA oligomers to reduce surface area.For the cobalt(II) ions system, cobalt(II) ions formed complex with hydroxyl ions and not DOPA monomers.With the initiation of oxidation, cyclization and polymerization of DOPA, the hydroxyl ions were then displaced by the oxidized DOPA units or PDA oligomers.When both iron(III) ions and cobalt(II) ions are added into the system, iron(III) ions were observed to play a more dominant role during the in situ polymerization process.The transition metal/PDA hybrids could be converted into transition metal/carbonized polydopamine (C-PDA) nanocomposites via a facile annealing process.These transition metal/C-PDA nanocomposites, Fe3O4/C-PDA and CoFe2O4/CoFe/C-PDA, were then investigated as oxygen electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in air cathode of primary and rechargeable zinc-air batteries (ZnABs).

10.32657/10356/74174

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Silicon nanoparticles encapsulated in hollow graphitized carbon nanofibers for lithium ion battery anodes

Nanoscale (2013)

Junhua Kong Wu Aik Yee Yuefan Wei Liping Yang Jia Ming Ang

Silicon (Si) is a promising material for lithium ion battery (LIB) anodes due to its high specific capacity. To overcome its shortcomings such as insulation property and large volume change during the charge–discharge process, a novel hybrid system, Si nanoparticles encapsulated in hollow graphitized carbon nanofibers, is studied. First, electrospun polyacrylonitrile (PAN)–Si hybrid nanofibers were obtained using water as the collector. The loose nanofiber lumps suspended in water have large inter-fiber distance, allowing in situ coating of a thin layer of polydopamine (PDA), the source for graphitized carbon, uniformly throughout the system. The designed morphology and structure were then realized by etching and calcination, and the morphology and structure were subsequently verified by various analytical techniques. Electrochemical measurements show that the resulting hollow hybrid nanofibers (C-PDA–Si NFs) exhibit much better cycling stability and rate capacity than conventional C/Si nanofibers derived by electrospinning of PAN–Si followed by calcination. For instance, the capacity of C-PDA–Si NFs is as high as 72.6% of the theoretical capacity after 50 cycles, and a high capacity of 500 mA h g−1 can be delivered at a current density of 5 A g−1. The significantly improved electrochemical properties of C-PDA–Si NFs are due to the excellent electrical conductivity of the carbonized PDA (C-PDA) shell that compensates for the insulation property of Si, the high electrochemical activity of C-PDA, which has a layered structure and is N-doped, the hollow nature of the nanofibers and small size of Si nanoparticles that ensure smooth insertion–extraction of lithium ions and more complete alloying with them, as well as the buffering effect of the remaining PAN-derived carbon around the Si nanoparticles, which stabilizes the structure.

Polyacrylonitrile

Electrospinning

10.1039/c3nr34024d

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Citations (169)

Mussel-inspired facile synthesis of Fe/Co-polydopamine complex nanospheres: complexation mechanism and application of the carbonized hybrid nanospheres as an efficient bifunctional electrocatalyst

New Journal of Chemistry (2018)

Jia Ming Ang Bing Li Shibo Xi Yonghua Du Chenyang Zhao

A one-pot synthesis of Co(ii)–Fe(iii)–PDA complex nanospheres as a facile approach to obtain binary metal-doped carbon nanostructures.

10.1039/c8nj04243h

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Highly electrically conductive layered carbon derived from polydopamine and its functions in SnO2-based lithium ion battery anodes

Chemical Communications (2012)

Junhua Kong Wu Aik Yee Liping Yang Yuefan Wei Si Lei Phua

Thin carbonized polydopamine (C-PDA) coatings are found to have similar structures and electrical conductivities to those of multilayered graphene doped with heteroatoms. Greatly enhanced electrochemical properties are achieved with C-PDA-coated SnO2 nanoparticles where the coating functions as a mechanical buffer layer and conducting bridge.

Heteroatom

Carbon fibers

Buffer (optical fiber)

10.1039/c2cc35284b

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Citations (221)

Robust microhoneycomb-like nanofibrous aerogels derived from cellulose and lignin as highly efficient, low-resistant and anti-clogging air filters

Journal of Membrane Science (2021)

Xiu Yun Daphne Zhihui Zeng Zhe Wang Lulu Xu Youfang Zhang

Clogging

Filtration (mathematics)

Air filtration

Air filter

10.1016/j.memsci.2021.119977

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Citations (26)

Electrospinning of lignin : from waste to functional materials

Jia Ming Ang

Electrospinning

Source

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Polydopamine-derived porous nanofibers as host of ZnFe₂O₄ nanoneedles: towards high-performance anodes for lithium-ion batteries

RSC Advances (2015)

Junhua Kong Xiayin Yao Yuefan Wei Chenyang Zhao Jia Ming Ang

Highly mesoporous free-standing carbon nanofibers (PNFs) with adjustable surface are successfully fabricated. ZnFe₂O₄ nanoneedles are strikingly formed and hosted by the PNFs to achieve excellent electrochemical performance.

10.1039/c4ra16460a

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Citations (41)

Self-Assembly-Induced Alternately Stacked Single-Layer MoS₂ and N-doped Graphene: A Novel van der Waals Heterostructure for Lithium-Ion Batteries

ACS Applied Materials & Interfaces (2016)

Chenyang Zhao Xu Wang Junhua Kong Jia Ming Ang Pooi See Lee

In this article, a simple self-assembly strategy for fabricating van der Waals heterostructures from isolated two-dimensional atomic crystals is presented. Specifically, dopamine (DOPA), an excellent self-assembly agent and carbon precursor, was adsorbed on exfoliated MoS2 monolayers through electrostatic interaction, and the surface-modified monolayers self-assembled spontaneously into DOPA-intercalated MoS2. The subsequent in situ conversion of DOPA to highly conductive nitrogen-doped graphene (NDG) in the interlayer space of MoS2 led to the formation of a novel NDG/MoS2 nanocomposite with well-defined alternating structure. The NDG/MoS2 was then studied as an anode for lithium-ion batteries (LIBs). The results show that alternating arrangement of NDG and MoS2 triggers synergistic effect between the two components. The kinetics and cycle life of the anode are greatly improved due to the enhanced electron and Li(+) transport as well as the effective immobilization of soluble polysulfide by NDG. A reversible capacity of more than 460 mAh/g could be delivered even at 5 A/g. Moreover, the abundant voids created at the MoS2-NDG interface also accommodate the volume change during cycling and provide additional active sites for Li(+) storage. These endow the NDG/MoS2 heterostructure with low charge-transfer resistance, high sulfur reservation, and structural robustness, rendering it an advanced anode material for LIBs.

10.1021/acsami.5b11492

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Citations (213)

Self-Assembly-Assisted Facile Synthesis of MoS₂-Based Hybrid Tubular Nanostructures for Efficient Bifunctional Electrocatalysis

ACS Applied Materials & Interfaces (2018)

Chenyang Zhao Youfang Zhang Lunfeng Chen Chaoyi Yan Peixin Zhang

In this work, MoS2-based hybrid tubular nanostructures are facilely synthesized via a self-assembly-assisted process and evaluated as a bifunctional electrocatalyst for hydrogen evolution reactions (HERs) and oxygen reduction reactions (ORRs). By simply mixing the reactants under ambient conditions, (NH4)2MoS4/polydopamine (PDA) hybrid nanospheres are formed. The protonated dopamine is linked to tetrahedral [MoS4]2– via weak N–H···S and O–H···S interactions, causing the PDA nanospheres merging together and forming nanorods under stirring-induced shear force. Moreover, the oxidative polymerization of dopamine proceeds on the surface of the nanorods, whereas it is prohibited inside the nanorods owing to lack of oxygen, leading to outward diffusion of dopamine and hence cavitation. After annealing, the tubular morphology is perfectly retained, while ultrafine MoS2 monolayers are formed due to the confinement of the framework. Benefiting from these unique structural features, the MoS2/C hybrid nanotubes possess abundant active sites and high surface area, as well as boost electronic and ionic transport, remarkably enhancing their electrocatalytic activities. The onset and half-wave potentials are 0.91 and 0.82 V, respectively, for ORR, close to those of Pt/C. Moreover, low onset potential and small Tafel slope are also observed for HER, demonstrating the potential of the hybrid nanotubes as a promising non-noble metal bifunctional electrocatalyst.

Nanorod

10.1021/acsami.8b04140

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Citations (22)