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Transition-metal-doped Fe2O3 nanoparticles for oxygen evolution reaction

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Progress in Natural science:Materials International 2018年第4期28卷 430-436页

作者： Yichun Yin Xiwang Zhang Chenghua Sun arc centre of Excellence for electromaterials science School of Chemistry Monash University Department of Chemical Engineering Monash University Faculty of science Engineering & Technology Swinburne University of Technology

Hematite(α-Fe2O3)has been extensively studied as a promising photocatalyst,with the capacity to split water under visible *** tune its electronic structure and improve the performance for oxygen evolution reaction(OER),high-quality single crystals ofα-Fe2O3nanoparticles were synthesized and doped by various transition metals(M=V,Cr,Mn,Zn,Co,Ni,Cu,Nb,Mo,Ti)by a molten-salt flux ***,electronic and catalytic properties of transition-metal-dopedα-Fe2O3(TM-dopedα-Fe2O3)have been systematically *** has been identified as the best dopant forα-Fe2O3,reducing the OER overpotential by 0.16 V with respect to the undoped.

关键词： Hematite Metal doping Water splitting Oxygen evolution reaction

Scale up of reactors for carbon dioxide reduction

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Frontiers of Chemical science and Engineering 2023年第1期17卷 116-122页

作者： Andrew Nattestad Klaudia Wagner Gordon G.Wallace Intelligent Polymer Research Institute and arc centre of Excellence for electromaterials science University of WollongongWollongong NSW 2522Australia School of Chemistry Monash UniversityClayton VIC 3800Australia

In recent times there has been a great deal of interest in the conversion of carbon dioxide into more useful chemical *** the other hand,the translation of these developments in electrochemical reduction of carbon dioxide from the laboratory bench to practical scale remains an underexplored *** we examine some of the major challenges,demonstrating some promising strategies towards such scale-up,including increased electrode area and stacking of electrode pairs in different *** observed that increasing the electrode area from 1 to 10 cm^(2) led to only a 4%drop in current density,with similarly small penalties realised when stacking sub-cells together.

关键词： CO_(2)reduction electrochemical cell electrosynthesis upscaling

Ultra-small Cu nanoparticles embedded in N-doped carbon arrays for electrocatalytic CO2 reduction reaction in dimethylformamide

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Nano Research 2018年第7期11卷 3678-3690页

作者： Xiaolong Zhang Ying Zhang Fengwang Li Christopher D. Easton Alan M. Bond Jie Zhang School of Chemistry Monash University Clayton 3800 VIC Australia arc centre of Excellence for electromaterials science Monash University Clayton 3800 VIC Australia CSIRO Manufacturing BayviewAvenue Clayton 3168 VIC Australia

The development of heterogeneous catalysts with a well-defined micro structure to promote their activity and stability for electrocatalyfic CO2 reduction has been shown to be a promising strategy. In this work, Cu nanoparticles （- 4 nm in diameter） embedded in N-doped carbon （Cu@NC） arrays were fabricated by thermal decomposition of copper tetracyanoquinodimethane （CuTCNQ） under N2. Compared to polycrystalline copper electrodes, the Cu@NC arrays provide a significantly improved number of catalytically active sites. This resulted in a 0.7 V positive shift in onset potential, producing a catalytic current density an order magnitude larger at a potential of -2.7 V vs. Fc/Fc＋（Fc = ferrocene） in dimethylformamide （DMF）. By controlling the water content in the DMF solvent, the CO2 reduction product distribution can be tuned. Under optimal conditions （0.5 vol.% water）, 64% HCOO^-, 20% CO, and 13% H2 were obtained. The Cu@NC arrays exhibited excellent catalytic stability with only a 0.5% decrease in the steady-state catalytic current during 6 h of electrolysis. The three-dimensional （3D） array structure of the Cu@NC was demonstrated to be effective for improving the catalytic activity of copper based catalysts while maintaining long-term catalytic stability.

关键词： copper tetracyanoquinodimethane (CuTCNQ) copper carbon arrays CO2 reduction electrocatalysis

Mesoporous Carbon-Tin Nanocomposites as Anode Materials for Li-ion Battery

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Journal of Materials science & Technology 2008年第4期24卷 657-660页

作者： Z. W.Zhao Z.P.Guo P. Yao H.K.Liu Institute for Superconducting and Electronic Materials University of Wollongong NSW 2522 Australia arc centre of Excellence for electromaterials science University of Wollongong NSW 2522 Australia centre for Analysis and Measurement Tianjin University Tianjin 300072 China

A new mesoporous carbon-tin （MC-Sn） nanocomposite has been successfully prepared via a two-step method. From the transmission electron microscopy （TEM） observations, the tin nanoparticles were decorated on the as-prepared mesoporous carbons. The mesoprous structure of the carbon can effectively buffer the volume changes during the Li-Sn alloying and de-alloying cycles. The as-prepared MC/Sn nanocomposite electrodes exhibited extremely good cycling stability, with the specific capacity of Sn in the composite electrode calculated to be 959.7 mAh-g-1, which amounts to an impressive 90.9% of the theoretical value （990 mAh-g-1）. The reversible capacity after 200 cycles is 96.1% of the first cycle reversible capacity, i.e., the capacity fade rate is only 0.0195% per cycle, which is even better than that of commercial graphite-based anodes.

关键词： Mesoporous Carbon Tin Nanocomposites Lithium ion battery

Recent progress in 2D materials for flexible supercapacitors

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Journal of Energy Chemistry 2018年第1期27卷 57-72页

作者： Yan Han Yu Ge Yunfeng Chao Caiyun Wang Gordon G.Wallace Energy&Materials Engineering centre College of Physics and Materials Science.Tianjin Normal UniversityTianjin 300387.China arc centre of Excellence for electromaterials science Intelligent Polymer Research InstituteUniversity of Wollongong.NSW 2500.Australia

High performance supercapacitors coupled with mechanical flexibility are needed to drive flexible and wearable electronics that have anesthetic appeal and multi-functionality. Two dimensional（2D） materials have attracted attention owing to their unique physicochemical and electrochemical properties, in addition to their ability to form hetero-structures with other nanomaterials further improving mechanical and electrochemical properties. After a brief introduction of supercapacitors and 2D materials, recent progress on flexible supercapacitors using 2D materials is reviewed. Here we provide insights into the structure–property relationships of flexible electrodes, in particular free-standing films. We also present our perspectives on the development of flexible supercapacitors.

关键词： 2D materials Flexible supercapacitors Graphene Molybdenum disulfide MXenes

In situ TEM observation of dissolution and regrowth dynamics of MoO2 nanowires under oxygen

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Nano Research 2017年第2期10卷 397-404页

作者： Wentao Yuan Jian Yu Hengbo Li Ze Zhang Chenghua Sun Yong Wang Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China arc centre for electromaterials science School of Chemistry Monash University Clayton Victoria 3800 Australia

Direct observation of the dissolution behavior of nanomaterials could provide fundamental insight to understanding their anisotropic properties and stability. The dissolution mechanism in solution and vacuum has been well documented. However, the gas-involved dissolution and regrowth have seldom been explored and the mechanisms remain elusive. We report herein, an in situ TEM study of the dissolution and regrowth dynamics of MoO2 nanowires under oxygen using environmental transmission electron microscopy （ETEM）. For the first time, oscillatory dissolution on the nanowire tip is revealed, and, intriguingly, simultaneous layer-by-layer regrowth on the sidewall facets is observed, leading to a shorter and wider nanowire. Combined with first-principles calculations, we found that electron beam irradiation caused oxygen loss in the tip facets, which resulted in changing the preferential growth facets and drove the morphology reshaping.

关键词： oxide surface oscillatory behavior dissolution kinetics in situ transmissionelectron microscopy (TEM) environmentaltransmission electronmicroscopy (ETEM)

Conversion coatings of Mg-alloy AZ91D using trihexyl(tetradecyl) phosphonium bis(trifluoromethanesulfonyl)amide ionic liquid

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science China Chemistry 2012年第8期55卷 1598-1607页

作者： HOWLETT P. C. GRAMET S. LIN J. EFTHIMIADIS J. CHEN X. B. BIRBILIS N. FORSYTH M. arc centre of Excellence for electromaterials science Institute for Frontier Materials Deakin Univerxlty Burwood Campus Burwood Victoria 3125 Australia CAST Cooperative Research centre Department of Materials Engineering Monash University Melbourne Victoria 3800 Australia

This work reveals the performance of a trihexyl(tetradecyl)phosphonium bis(trifluoromethanesulfonyl)amide ([P6,6,6,14][NTf2]) ionic liquid (IL) conversion coating upon AZ91D. Such conversion coatings represent a novel avenue for chromate replacement. An optimization of coating performance was pursued by careful alloy pretreatment to generate a surface on which the coating performs best, as the AZ91 substrate is distinctly different from pure or dilute Mg alloys. The results reveal that a functional conversion coating can be achieved, retarding anodic dissolution kinetics, causing a significant decrease in corrosion rate. The coating efficacy is closely tied to the pretreatment performed, which dictates both the microstructural and electrochemical heterogeneity of the surface. The resulting coatings were found to contain MgxFx and phosphonium cation related components, the proportions of which were dependent on the pretreatment.

关键词： AZ91D corrosion conversion coating ionic liquid pretreatment

Electrochemical CO2 reduction over nitrogen-doped SnO2 crystal surfaces

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Journal of Energy Chemistry 2019年第6期28卷 22-30页

作者： Yuefeng Zhang Jianjun Liu Zengxi Wei Quanhui Liu Caiyun Wang Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina arc centre of Excellence for electromaterials science. Intelligent Polymer Research Institute AIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia

Crystal planes of a catalyst play crucial role in determining the electrocatalytic performance for CO2 *** catalyst SnO2 can convert CO2 molecules into valuable formic acid(HCOOH).Incorporating heteroatom N into SnO2 further improves its catalytic *** understand the mechanism and realize a highly efficient CO2-to-HCOOH conversion,we used density functional theory(DFT)to calculate the free energy of CO2 reduction reactions(CO2RR)on different crystal planes of N-doped SnO2(N-SnO2).The results indicate that N-SnO2 lowered the activation energy of intermediates leading to a better catalytic performance than pure *** also discovered that the N-Sn O2 (211)plane possesses the most suitable free energy during the reduction process,exhibiting the best catalytic ability for the CO2-to-HCOOH *** intermediate of CO2RR on N-SnO2 is HCOO*or COOH* instead of OCHO*.These results may provide useful insights into the mechanism of CO2RR,and promote the development of heteroatomdoped catalyst for efficient CO2RR.

关键词： CO2 reduction reaction SnO2 Crystal surface Electrocatalysis First principles

Metal porphyrin intercalated reduced graphene oxide nanocomposite utilized for electrocatalytic oxygen reduction

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Green Energy & Environment 2017年第3期2卷 285-293页

作者： Mingyan Wang Qing Wang Wei Zhu Ying Yang Huixian Zhou Fan Zhang Lihua Zhou Joselito M.Razal Gordon G.Wallace Jun Chen Jiangsu Marine Resources Development Research Institute Huaihai Institute of Technology Institute of Frontier Materials Deakin University Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials Science Australian Institute of Innovative Materials University of Wollongong

In this paper, we report a simple and facile self-assembly method to successfully fabricate cationic metal porphyrin-MtTMPyP(Mt= Cobalt(Ⅱ), Manganese(Ⅲ), or Iron(Ⅲ); TMPyP = 5, 10, 15, 20-tetrakis(N-methylpyridinium-4-yl) porphyrin) intercalated into the layer of graphene oxide(GO) by the cooperative effects of electrostatic and π-π stacking interaction between positively charged metal porphyrin and negatively charged GO sheets. Followed by reduction with hydrazine vapor, a series of novel 2 D MtTMPyP/rGO_n were fabricated. The as-prepared 2 D hybrids were fully characterized and tested as non-noble metal catalysts for oxygen reduction reaction(ORR) in an alkaline medium. The MtTMPyP/rGO_n hybrids, especially CoTMPyP/rGO_5, demonstrated an improved electrocatalytic activity for ORR and a number of exchanged electrons close to 4-electron reaction, increased stability and excellent tolerance to methanol, showing a potential alternative catalyst for ORR in fuel cells and air batteries.

关键词： Metal porphyrin Reduced graphene oxide Intercalation Oxygen reduction reaction Catalyst