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In situ anchoring in carbon matrix of Bi_(2)O_(2)CO_(3) as a high-performance anode material for Li-ion batteries

Rare Metals 2024年第8期43卷 3634-3646页

作者： Pu-Qiang He Jun guo Hui Huang zhong-cheng guo Faculty of Metallurgy and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Research Center of Metallurgical Electrode Materials Engineering Technology Kunming 650106China Kunming Hendera Science and Technology Co. Ltd.Kunming 650106China

Bismuth-based anode materials have been regarded as promising Li-ion batteries due to their high theoretical ***,their low conductivity and associated volume expansion inhabited their *** this work,Bi_(2)O_(2)CO_(3)@C composites were successfully synthesized by in situ anchoring of flower-like Bi_(2)O_(2)CO_(3) nanosheets on a carbon-based substrate via *** unique composited structure of Bi_2O_(2)-CO_(3)@C leads to a stable specific capacity of 547 mAh·g^(-1)after 100 cycles at a current density of 0.1 A·g^(-1).Notably,it demonstrates excellent rate capability with a specific capacity of 210 mAh·g^(-1)at 5 A·g^(-1).After 550 cycles at a current density of 0.5 A·g^(-1),a high reversible capacity of nearly 400 mAh·g^(-1)was ***,in situ X-ray diffraction measurements clearly demonstrate the conversion between Bi and Li_(3)Bi during alloying/dealloying,confirming the good electrochemical reversibility of the materials for Li *** reaction kinetics of Bi_(2)O_(2)CO_(3)@C were further investigated using galvanostatic intermittent titration ***,Bi_2O_(2)-CO_(3)@C exhibited excellent long-term stability,maintaining its high reversible capacity for over 200 cycles at a current density of 0.5 A·g^(-1)in a full cell configuration using Li_(1.20)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) as the cathode *** result further underscores its promising potential for lithium-ion *** work may provide inspiration for the design of alloy-type negative electrode materials for high-performance rechargeable batteries.

关键词： Bi_(2)O_(2)CO_(3) Composite materials Anode materials Full batteries

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Effect of rolling technologies on the properties of Pb?0.06wt%Ca?1.2wt%Sn alloy anodes during copper electrowinning

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International Journal of Minerals,Metallurgy and Materials 2015年第11期22卷 1205-1211页

作者： Jian Yang Bu-ming Chen Hui Hang zhong-cheng guo Shuai Wang Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming Hendera Science and Technology Co. Ltd.

The objective of this work was to study the effect of different rolling technologies on the properties of Pb-0.06wt%Ca-1.2wt%Sn anodes during copper electrowinning and to determine the relationship between the properties of the anodes and rolling techniques during copper electrowinning. The anode process was investigated via anodic polarization curves, cyclic voltammetry curves, electrochemical impedance spectra, and corrosion tests. The microscopic morphology and phase composition of the anodic oxide layers were observed by scanning electron microscopy and X-ray diffraction, respectively. Observable variations in the electrocatalytic activity and reaction kinetics of anodes during electrowinning indicated that the electrochemical behavior of the anodes was strongly affected by the rolling technology. An increase in the rolling number tended to decrease the oxygen evolution overpotential and the corrosion rate of the anodes. These trends are contrary to that of the apparent exchange current density. Furthermore, the intensities of diffraction peaks associated with PbO, PbOx, and α-PbO2 tended to increase with increasing rolling number. In addition, the rolled anodes exhibited a more uniform microstructure. Compared with one-way rolled anodes, the eight-time cross rolled anodes exhibited better electrocatalytic activity and improved corrosion resistance.

关键词： anode materials lead calcium tin alloys rolling electrocatalysis corrosion rate electrowinning

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Properties of a new type Al/Pb-0.3%Ag alloy composite anode for zinc electrowinning

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 986-993页

作者： Hai-tao Yang Huan-rong Liu Yong-chun Zhang Bu-ming Chen zhong-cheng guo Rui-dong Xu Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming Hendera Science and Technology Co.Ltd. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization

An A1/Pb-0.3%Ag alloy composite anode was produced via composite casting. Its electrocatalytic activity for the oxygen evolution reaction and corrosion resistance was evaluated by anodic polarization curves and accelerated corro- sion test, respectively. The microscopic morphologies of the anode section and anodic oxidation layer during accelerated corrosion test were obtained by scanning electron microscopy. It is found that the composite anode （hard anodizing） dis- plays a more compact interracial combination and a better adhesive strength than plating tin. Compared with industrial Pb-0.3%Ag anodes, the oxygen evolution overpotentials of A1/Pb-0.3%Ag alloy （hard anodizing） and A1/Pb-0.3%Ag alloy （plating tin） at 500 A.m-2 were lower by 57 and 14 mV, respectively. Furthermore, the corrosion rates of Pb-0.3%Ag alloy, A1/Pb-0.3%Ag alloy （hard anodizing）, and A1/Pb-0.3%Ag alloy （plating tin） were 13.977, 9.487, and 11.824 g.m-2.h-1, respectively, in accelerated corrosion test for 8 h at 2000 A-m-2. The anodic oxidation layer of A1/Pb-0.3%Ag alloy （hard anodizing） is more compact than Pb-0.3%Ag alloy and A1/Pb-0.3%Ag alloy （plating tin） after the test.

关键词： composite anodes corrosion resistance oxygen evolution reaction electrocatalytic activity zinc electrowin-ning

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Fetal ECG Extraction Based on Adaptive Linear Neural Network

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Chinese Journal of Biomedical Engineering(English Edition) 2011年第2期20卷 75-82页

作者： JIA Wen-juan YANG Chun-lan zhong guo-cheng ZHOU Meng-ying WU Shui-cai Biomedical Engineering Center Beijing University of Technology Beijing 100124 China

Fetal ECG extraction has the vital significance for fetal *** paper introduces a method of extracting fetal ECG based on adaptive linear neural *** method can be realized by training a small quantity of *** addition,a better result can be achieved by improving neural network ***,more easily identified fetal ECG can be *** results show that the adaptive linear neural network can be used to extract fetal ECG from maternal abdominal signal ***'s more,a clearer fetal ECG can be extracted by improving neural network structure.

关键词： fetal ECG adaptive linear neural network W-H learning rule

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双层非饱和地基中Rayleigh波的传播特性

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岩土力学 2017年第10期38卷 2931-2938页

作者：章敏尚微周忠超郭诚太原理工大学建筑与土木工程学院山西太原030024 山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室山西太原030006

研究了双层非饱和地基中Rayleigh波(以下简称R波)的传播特性问题。首先将迂曲度引入孔隙流体的渗流连续性方程,对三相孔隙介质波动方程进行修正,接着采用体波的势函数之和构建各相介质的势函数,并借助Helmholtz分解,以及考虑土层边界条... 详细信息

研究了双层非饱和地基中Rayleigh波(以下简称R波)的传播特性问题。首先将迂曲度引入孔隙流体的渗流连续性方程,对三相孔隙介质波动方程进行修正,接着采用体波的势函数之和构建各相介质的势函数,并借助Helmholtz分解,以及考虑土层边界条件和层间连续性条件,建立了R波的弥散特征方程,分析了饱和度、迂曲度和上覆土层厚度等参数与波速和衰减性的关系。结果表明,R波波速随饱和度的增加而线性减小;在渗透系数中间区段,则随着固有渗透系数k的增大而增大;水力迂曲度τ_f对波速的影响主要体现在高频区段,而空气迂曲度τ_a的影响则非常有限;对于上软下硬地层,覆盖层厚度的增加将引起波速的减小,并逐渐趋于上覆土层本身的R波波速;且频率越高或表面层刚度越低,趋近速度越快。

关键词：非饱和土表面层 Rayleigh波传播特性

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Effect of cooling ways on properties of Al/Pb-0.2%Ag rolled alloy for zinc electrowinning

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Transactions of Nonferrous Metals Society of China 2017年第9期27卷 2096-2103页

作者： Xiang-yang ZHOU Shuai WANG Juan YANG zhong-cheng guo Jian YANG Chi-yuan MA Bu-ming CHEN School of Metallurgy and Environment Central South University Changsha 410083 China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China Kunming Hendera Science and Technology Co. Ltd. Kunming 650106 China

In order to study the new anode materials for zinc electrowinning,Al/Pb?0.2%Ag rolled alloy was produced by composite casting and hot *** the effect of cooling ways on properties of Al/Pb?0.2%Ag rolled alloy was *** the results of metallographic test indicated,with the increasing of cooling intensity,both Vickers hardness and yield strength of Al/Pb?0.2%Ag rolled alloy ***,the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,presents the finest grain size and shows the lowest oxygen evolution potential(1.5902V),while that of alloy cooled by water and air are1.6143V and1.6288V,***,the corrosion current density and corrosion rate of the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,are the *** can be attributed to its largest specific surface area,which promotes the contact between the anode and electrolyte.

关键词： Al/Pb-0.2%Ag rolled alloy cooling way electrocatalytic activity electrochemical property corrosion resistance zinc electrowinning

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柴油机燃烧室零件热弹性分析的有限元法

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内燃机学报 1983年第2期1卷 39-56页

作者：曹新忠郭成璧大连工学院

本文利用增量变分原理推导了有限元增量平衡方程及“一阶自校正”列式。编制的弹塑性计算程序考虑了进入塑性变形后的卸载问题以及温度对材料性能的影响。计算实例表明了一阶自校正程序的计算精度和经济性都比较好。最后对一示例活塞顶... 详细信息

本文利用增量变分原理推导了有限元增量平衡方程及“一阶自校正”列式。编制的弹塑性计算程序考虑了进入塑性变形后的卸载问题以及温度对材料性能的影响。计算实例表明了一阶自校正程序的计算精度和经济性都比较好。最后对一示例活塞顶进行了弹塑性计算分析。

关键词：有限元法数值分析热弹性分析有限元解材料性能热弹塑性有限元柴油机压燃发动机

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Electrosynthesis and physicochemical properties ofα-PbO_2-CeO_2-TiO_2 composite electrodes

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1191-1198页

作者：陈步明郭忠诚徐瑞东昆明理工大学冶金与能源工程学院昆明650093 昆明理工恒达科技有限公司昆明650105

In order to investigate the effect of solid particles dopants on physicochemical properties of α-PbO2 electrodes, a-PbO2 composite electrodes doped with nano-TiO2 and nano-CeO2 particles were respectively prepared on A1/conductive coating electrodes in 4 mol/L NaOH solution with addition of PbO until saturation by anodic codeposition. The electrodeposition mechanism, morphology, composition and structure of the composite electrodes were characterized by cyclic voltarnmogram （CV）, SEM, EDAX and XRD. Results show that the doping solid particles can not change reaction mechanism of α-PbO2 electrode in alkaline or acid plating bath, but can improve deposition rate and reduce oxygen evolution potential. The doping solid particles can inhibit the growth of a-PbO2 unit cell and improve specific surface area. The diffraction peak intensity of a-PbO2-CeO2-TiO2 composite electrode is lower than that of pure a-PbO2 electrode. The electrocatalytic activity of a-PbO2-2.12%CEO2-3.71%TIO2 composite electrode is the best. The Guglielmi model for CeO2 and TiO2 codeposition with a-PbO2 is also pronosed.

关键词： A1 lead dioxide composite electrodes electrocatalysis physicochemical property

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Influence of nano-CeO_2 on coating structure and properties of electrodeposited Al/α-PbO_2/β-PbO_2

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Transactions of Nonferrous Metals Society of China 2013年第5期23卷 1382-1389页

作者：陈阵余强廖登辉郭忠诚武剑昆明理工大学理学院昆明650093 昆明理工大学冶金与能源工程学院昆明650093

Al/α-PbO2/β-PbO2 composite electrodes doped with rare earth oxide （CeO2） were prepared by anodic oxidation method investigate the influence of nano-CeO2 dopants on the properties of Al/α-PbO2/β-PbO2-CeO2 electrodes and the impact of α-PbO2 as the intermediate layer. The results show that using α-PbO2 as the intermediate layer will benefit the crystallization of β-PbO2 and β-PbO2 is more suitable as the surface layer than α-PbO2. CeO2 dopants change the crystallite size and crystal structure, enhance the catalytic activity, and even change the deposition mechanism of PbO2. The doping of CeO2 in the PbO2 electrodes can enhance the electro-catalytic activity, which is helpful for oxygen evolution, and therefore reduce the cell voltage.

关键词： rare earth CeO2 composite electrode material α-PbO2 β-PbO2 cell voltage inert anode

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区块链在私募股权交易平台的应用前景与监管研究

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海南金融 2019年第4期 73-81页

作者：钟郭成华东政法大学国际金融法律学院上海200000

区块链技术在社会经济各领域,尤其是在金融领域的应用正受到广泛关注。本文从国内私募股权市场及其主要交易平台的现状的入手,对私募股权交易平台应用区块链技术的前景做出初步探讨,总结对区块链私募股权交易平台的法律监管的思路,最后... 详细信息

区块链技术在社会经济各领域,尤其是在金融领域的应用正受到广泛关注。本文从国内私募股权市场及其主要交易平台的现状的入手,对私募股权交易平台应用区块链技术的前景做出初步探讨,总结对区块链私募股权交易平台的法律监管的思路,最后再提出有关监管立法与政策的建议。

关键词：区块链私募股权市场私募股权交易平台金融监管

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