Jim Yang Lee

National University of Singapore

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Jianping Xie

National University of Singapore

Zhaolin Liu

Shanghai Electric (China)

Tianran Zhang

University of Chinese Academy of Sciences

Heng‐Phon Too

National University of Singapore

Qiaofeng Yao

Tianjin University

Ge Ji

National University of Singapore

Yong Wang

Shanghai University

Qingbo Zhang

Jiangsu University of Science and Technology

Liang Hong

National University of Singapore

Shengliang Zhang

University of Science and Technology of China

Cooperative Institutions

National University of Singapore

204

Chinese Academy of Sciences

Zhejiang University

Institute of Materials Research and Engineering

Nanyang Technological University

Agency for Science, Technology and Research

University of Chinese Academy of Sciences

Peking University

Tianjin University

Tsinghua University

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Investigating the Energy Storage Mechanism of SnS₂-rGO Composite Anode for Advanced Na-Ion Batteries

Chemistry of Materials (2015)

Chuze Ma Jing Xu Judith Alvarado Baihua Qu James Somerville

Tin sulfide–reduced graphene oxide (SnS2-rGO) composite material is investigated as an advanced anode material for Na-ion batteries. It can deliver a reversible capacity of 630 mAh g–1 with negligible capacity loss and exhibits superb rate performance. Here, the energy storage mechanism of this SnS2-rGO anode and the critical mechanistic role of rGO will be revealed in detail. A synergistic mechanism involving conversion and alloying reactions is proposed based on our synchrotron X-ray diffraction (SXRD) and in situ X-ray absorption spectroscopy (XAS) results. Contrary to what has been proposed in the literature, we determined that Na2S2 forms instead of Na2S at the fully discharge state. The as-formed Na2S2 works as a matrix to relieve the strain from the huge volume expansion of the Na–Sn alloy reaction, shown in the high resolution transmission electron microscope (HRTEM). In addition, the Raman spectra results suggest that the rGO not only assists the material to have better electrochemical performance by preventing particle agglomeration of the active material but also coordinates with Na-ions through electrostatic interaction during the first cycle. The unique reaction mechanism in SnS2-rGO offers a well-balanced approach for sodium storage to deliver high capacity, long-cycle life, and superior rate capability.

X-ray absorption spectroscopy

10.1021/acs.chemmater.5b01984

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Citations (193)

Assembly of Nanoions via Electrostatic Interactions: Ion-Like Behavior of Charged Noble Metal Nanoclusters

Scientific Reports (2014)

Qiaofeng Yao Zhentao Luo Xun Yuan Yue Yu Chao Zhang

Abstract The assembly of ultrasmall metal nanoclusters (NCs) is of interest to both basic and applied research as it facilitates the determination of cluster structures and the customization of cluster physicochemical properties. Here we present a facile and general approach to assemble noble metal NCs by selectively inducing electrostatic interactions between negatively-charged metal NCs and divalent cations. The charged metal NCs, which have well-defined sizes, charges and structures; and behave similarly to multivalent anions, can be considered as nanoions. These nanoions exhibit step-like assembly behavior when interacting with the counter cations – assembly only occurs when the solubility product (K sp ) between the carboxylate ions on the NC surface and the divalent cations is exceeded. The assembly here is distinctively different from the random aggregation of colloidal particles by counter ions. The nanoions would assemble into fractal-like monodisperse spherical particles with a high order of regularity that mimic the assembly of ionic crystals.

Nanoclusters

Divalent

Noble metal

Electrostatics

Dispersity

Carboxylate

10.1038/srep03848

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Citations (55)

A Phase-Transfer Identification of Core−Shell Structures in Ag−Pt Nanoparticles

The Journal of Physical Chemistry B (2005)

Jian Yang Jim Yang Lee Lingxin Chen Heng‐Phon Too

Ag−Pt nanoparticles with a confirmed core−shell structure could only be formed by the successive reduction method using Ag nanoparticles as the seeds. The core−shell structure could be conveniently inferred from the transferability of the particles from water to toluene. Independent measurements by UV−vis spectroscopy, transmission electron microscopy, energy-dispersive X-ray analysis, and X-ray photoelectron spectroscopy were used to validate the experimental results. The reverse order of synthesis using Pt nanoparticles as the seeds did not result in any core−shell product. Instead a physical mixture of Ag nanoparticles and the original Pt seeds was obtained under the same experimental conditions.

Transferability

10.1021/jp045994k

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Citations (75)

Electronic and optical properties of nitrogen-doped multiwalled carbon nanotubes

Physical Review B (2006)

Saw Hoon Lim Hendry Izaac Elim Xing Gao Andrew T. S. Wee Wei Ji

Highly nitrogen-doped carbon nanotube (${\mathrm{CN}}_{x}\mathrm{NT}$, $x=12\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$) was synthesized by the pyrolysis of acetonitrile on Co-Mo catalysts. The electronic structures and chemical bondings of ${\mathrm{CN}}_{x}\mathrm{NT}$ were studied using various spectroscopic techniques: Raman, photoelectron and x-ray absorption spectroscopies. The ultrafast pump-probe measurements of ${\mathrm{CN}}_{x}\mathrm{NT}$ exhibited a larger third-order susceptibility ${\ensuremath{\chi}}^{(3)}$, a relaxation time of ${\ensuremath{\tau}}_{2}=1\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$ and improved saturable absorption, as compared with undoped multiple-walled carbon nanotubes, which indicate that N-doping can improve all-optical switching properties of carbon nanotubes.

10.1103/physrevb.73.045402

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Citations (186)

Renewable-surface graphite–ceramic enzyme sensors for the determination of hypoxanthine in fish meat

Analytical Communications (1999)

Jianjun Niu Jim Yang Lee

Sol–gel processes were used to fabricate amperometric biosensors that are active for hypoxanthine (Hx) determination. Xanthine oxidase was immobilized in the bulk of the silica–graphite matrix (SGM) to produce electrodes where new surfaces can be generated on demand by mechanical polishing. The immobilized enzyme electrodes can be used in unmediated hydrogen peroxide oxidation mode, or in unmediated and mediated oxygen reduction mode, to result in three different types of Hx biosensors with detection limits of 1.3 × 10–6, 5.6 × 10–6 and 3.8 × 10–7M, respectively. Benzyl viologen was used as the charge transfer mediator to enhance the response in the hydrogen peroxide production mode. The sensors show good linear response over a wide range of concentrations of about 1 × 10–6–1 × 10–3M. The use of bulk immobilization and the possibility of renewable surfaces have enabled the easy operation of these sensors with high stability. The experimental results from a carp sample stored under different conditions demonstrate the practicality of these sensors as simple, rapid and cost effective measurement of fish meat freshness.

Amperometry

Hypoxanthine

Choline oxidase

10.1039/a900896i

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Citations (32)

Preparation and characterization of positively charged ruthenium nanoparticles

Journal of Colloid and Interface Science (2003)

Jun Yang Jim Yang Lee T.C. Deivaraj Heng‐Phon Too

Characterization

10.1016/j.jcis.2003.10.041

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Citations (53)

Phase transfer and its applications in nanotechnology

Chemical Society Reviews (2010)

Jun Yang Jim Yang Lee Jackie Y. Ying

As nanoparticle syntheses in aqueous and organic systems have their own merits and drawbacks, specific applications may call for the transfer of newly formed nanoparticles from a polar to a non-polar environment (or vice versa) after synthesis. This critical review focuses on the application of phase transfer in nanoparticle synthesis, and features core-shell structures in bimetallic nanoparticles, replacement reactions in organic media, and catalytic properties of various nanostructures. It also describes the reversible organic and aqueous phase transfer of semiconductor and metallic nanoparticles for biological applications, and the use of phase transfer in depositing noble metals on semiconductor nanoparticles (258 references).

Bimetallic strip

Aqueous two-phase system

10.1039/b916790k

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Citations (221)

The Relationship between Stoichiometry and Kinetics Revisited

Journal of Chemical Education (2001)

Jim Yang Lee

Toby presented relations between concentrations of reaction participants in network reactions, obtained from kinetic considerations (rate laws) (J. Chem. Educ. 2000, 77, 188). The approach relies on the supposition of a reaction mechanism, the specification of the detailed kinetics for each elementary step, and mathematical simplifications by pseudo-steady-state approximation or prior equilibrium. However, the same results can be obtained more directly from material balance and reaction stoichiometry without any detailed information on chemical kinetics. This mirrors the often observed independence between stoichiometry and kinetics in most reactions of practical importance.

Stoichiometry

Detailed balance

Rate equation

Reaction rate

10.1021/ed078p1283

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Citations (0)

Linker-free 3D assembly of nanocrystals with tunable unit size for reversible lithium ion storage

Nanotechnology (2011)

Da Deng Jim Yang Lee

A simple and scalable procedure combining hydrothermal synthesis with post-synthesis calcination was developed to produce a linker-free, thermally stable, mesoscale 3D ordered assembly of spinel-type ZnCo2O4 nanocrystals. The mesoscale assembly with distinctively sharp edges was formed by close-packing the ZnCo2O4 nanocrystal building blocks with a unit size changeable by the synthesis temperature. A self-templating mechanism based on the topotactic transformation of an oxalato-bridged precursor coordination compound was proposed for the assembly. The packaging of crystalline ZnCo2O4 nanoparticles, an active lithium ion storage compound, into a dense organized structure is an effective way to increase the volumetric capacity of ZnCo2O4 nanoparticles for reversible lithium ion storage. The highly ordered 3D assembly of ZnCo2O4 demonstrated excellent reversible lithium ion storage properties and a specific capacity (∼800 mAh g − 1) much higher than that of carbon (typically ∼ 350 mAh g − 1).

Linker

10.1088/0957-4484/22/35/355401

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Citations (43)

Preparation of Pt and PtRu nanoparticles supported on carbon nanotubes by microwave-assisted heating polyol process

Materials Letters (2004)

Weixiang Chen Jim Yang Lee Zhaolin Liu

Carbon fibers

10.1016/j.matlet.2004.06.008

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Citations (103)