Synthesis of LiFePO4/C Cathode by Sol-gel and Calcining Method with Chitosan Monomer

本文以壳聚糖单体为碳源兼凝胶剂，利用溶胶-凝胶煅烧合成了锂离子电池LiFePO4/C正极材料，使用XRD和SEM对合成的材料进行表征. 用恒电流充放电测试了LiFePO4/C电极的电化学性能，当壳聚糖单体与LiFePO4摩尔比为1:1.2时，600 oC煅烧的LiFePO4/C电极性能最佳，其粒径分布均匀（200 ～ 400 nm），该电极0.2C倍率放电比容量为155 mAh.g-1，30周期循环放电比容量仍保持152 mAh.g-1，库仑效率为97.9 %.The LiFePO4/C cathode materials for Li-ion battery were synthesized by sol-gel and calcining method using chitosan monomer as a carbon source and a gelating agent. The structures and morphologies were characterized by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM). The electrochemical performance was investigated by the galvanostatic charge–discharge test. When the molar ratios between chitosan monomer and LiFePO4 were 1:1.2, the LiFePO4/C cathode calcined at 600 oC showed the best performance. The particle sizes ranged 200 ～ 400 nm. The initial discharge capacity of 155 mAh.g-1 was achieved at room temperature with discharge rate of 0.2C, while the capacity of 152 mAh.g-1 could be maintained after 30 charge-discharge cycles. The coulombic efficiency was 97.9%.国家自然科学基金项目（No. 20973048）资助作者联系地址：1. 哈尔滨工程大学材料科学与化学工程学院，黑龙江 哈尔滨 150001；2. 哈药集团三精制药有限公司，黑龙江 哈尔滨，150069Author's Address: 1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; 2. Harbin Pharm. Group Sanjing Pharmaceutical Shareholding Co., Ltd, Harbin 150069, China通讯作者E-mail：[email protected]

Electrochemical Behavior of Mg-Li Electrodes in NaCl Solution

应用熔炼法制备含Li量为8.5%和14%的两种Mg-Li合金,分别由电势线性扫描、计时电流、交流阻抗和失重法等检测Mg-Li电极在NaCl溶液中的电化学特性,SEM观察其放电表面形貌.结果表明:Mg-14Li电极比Mg-8.5Li电极有较负的开路电位、更大的放电电流和较高的放电效率,但附着电极表面的疏松产物易于脱落.Mg-8.5Li电极的放电效率高于Mg-14Li电极的放电效率.两种电极在低恒电位放电电流效率均高于较高恒电位的放电电流效率.The Mg-Li electrodes containing 8.5% and 14% Li were prepared using an induction melting method.Their electrochemical behavior in NaCl solution was investigated by means of potentiodynamic polarization,potentiostatic oxidation,electrochemical impedance technique and mass-loss measurements.The morphology of the electrodes after discharge was examined using scanning electron microscopy.The Mg-14Li electrode showed more negative open circuit potential and higher discharge current density than Mg-8.5Li electrode.The oxidation products of Mg-14Li loosely attached on the electrode surface and peeled off easily.The Mg-8.5Li exhibited higher utilization efficiency.Both electrodes gave higher utilization efficiencies when discharged at lower anodic potential.作者联系地址：哈尔滨工程大学超轻材料与表面技术教育部重点实验室材料科学与化学工程学院;Author's Address: Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Chin

Electrocatalytic Activities of Au-MmNi_(3.2)Al_(0.2)Mn_(0.6)Co_(1.00) for Borohydride Oxidation

研究经NaOH处理了的MmNi3.2Al0.2Mn0.6Co1.0,再应用电沉积法制备Au改性的MmNi3.2Al0.2Mn0.6Co1.0催化剂对NaBH4的电催化氧化性能.SEM观察催化剂样品的微观形貌,线性伏安扫描法测定其电催化氧化性能,发现Au-MmNi3.2Al0.2Mn0.6Co1.0电极电催化氧化NaBH4电流密度为60 mA.cm-2,比在MmNi3.2Al0.2Mn0.6Co1.0电极的增加3.5倍.若对该电极在电解质中预浸泡10 h,则氧化电流密度可达到184 mA.cm-2.In this work,the electrocatalytic activities of MmNi3.2Al0.2Mn0.6Co1.0,NaOH treated MmNi3.2Al0.2Mn0.6Co1.0 and Au-MmNi3.2Al0.2Mn0.6Co1.0 obtained after NaOH treatment(Mm: misch metal) for NaBH4 oxidation were reported.The electrodes were prepared by electrodeposition,their morphologies were analysized by SEM,their electrocatalytic properties were studied by the linear sweeping test.It was found that the oxidation current density of the Au-MmNi3.2Al0.2Mn0.6Co1.0 was 60 mA·cm-2,it was 3.5 times higher than that at the MmNi3.2Al0.2Mn0.6Co1.0 electrode.In addition,the oxidation current density at the Au-MmNi3.2Al0.2Mn0.6Co1.0 electrode immersed in the electrolyte solution for 10 hours was 184 mA·cm-2.作者联系地址：哈尔滨工业大学市政环境工程学院;哈尔滨工程大学材料科学与化学工程学院;Author's Address: 1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Chin

The Electrochemical Capacitance Performance of La1-xSrxCoO3 Perovskites

以溶胶-凝胶法制备La1-xSrxCoO3(x = 0.2, 0.4, 0.6, 0.8)电极材料，XRD表征证明所得产物属钙钛矿相. 由循环伏安和充放电曲线测试了La1-xSrxCoO3在碱性介质中的电化学电容性能. 结果表明，La0.6Sr0.4CoO3电极10 mA.cm-2电流密度的放电比电容为325 F.g-1，500周期循环后其比电容仍保持于315 F.g-1，比电容保持率97.0%.In this paper, the La1-xSrxCoO3 (x = 0.2, 0.4, 0.6, 0.8) perovskites powders were synthesized by a sol-gel method. The perovskite phases were characterized by X-ray diffraction (XRD), while the electrochemical capacitance performance of La1-xSrxCoO3 electrodes in alkaline electrolyte was studied by cyclic voltammetry and galvanostatic charge/discharge test. It was found that the La0.6Sr0.4CoO3 electrode exhibited a specific capacitance of 325 F.g-1 in 6.0 mol.L-1 KOH electrolyte at a current density of 10 mA.cm-2, and the specific capacitance of 315 F.g-1 could be maintained after 500 charge/discharge cycles which corresponds to the retention rate of 97%.国家自然科学基金项目（No. 20973048）资助作者联系地址：1. 哈尔滨工程大学材料科学与化学工程学院，黑龙江 哈尔滨 150001； 2. 黑龙江中医药大学药学院，黑龙江 哈尔滨 150040Author's Address: 1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001,China；2. College of Pharmacy, Heilongjiang University of Traditional Chinese Medicine, Harbin 150040, China通讯作者E-mail：[email protected]

A Study of Pd-Ir on Nickel Foam Cathode for Aluminum-hydrogen Peroxide Semi-fuel Cells

以泡沫镍为基体,应用电化学沉积法制备Pd-Ir/Ni复合催化剂.由SEM、XPS分析样品的表面形态、组成以及各组分的价态.电化学测试表明该催化剂对H2O2电还原具有较高的催化性能,当过氧化氢的浓度为0.4 mol/L时,极限电流密度可超过318 mA/cm2.以纯铝或其合金作阳极、Pd-Ir/Ni作阴极组装Al-H2O2半燃料电池,得出其最大放电功率可达198 mW/cm2.The Pd-Ir/Ni electrodes were prepared by electrodeposition of Pd and Ir on the porous nickel foam surface.The structure,composition and state of the Pd-Ir catalyst were analyzed using SEM and XPS.The catalytic performance of Pd-Ir/Ni for H2O2 electroveduction at different concentrations of H2O2 were investigated.A limiting current density of 318 mA/cm2 was obtained with 0.4 mol/L H2O2.The aluminum-hydrogen peroxide semi-fuel cells using different aluminum alloys as anode and Pd-Ir/Ni as cathode were assembled and tested.It was found that the fuel cell with aluminum-manganese alloy anode demonstrated a maximum power density of 198mW/cm2 at 234mA/cm2.作者联系地址：哈尔滨工程大学材料科学与化学工程学院;Author's Address: College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Chin

Nano-sized Au on Nickel Foam as Cathode of Alkaline Al-H_2O_2 Semi Fuel Cell

以泡沫镍为基体,AuCl3为沉积液,应用快速自沉积法制备了泡沫镍负载的纳米Au/Ni电极.电化学方法测定AuCl3溶液的浓度和沉积时间对Au粒子的尺寸和分布以及以该电极作为Al-H2O2半燃料电池阴极对H2O2性能的影响.实验表明,泡沫镍经2mmol·L-1AuCl3溶液浸渍60s后,其表面完全被粒径小于100nm的Au粒子覆盖;以其为阴极的Al-H2O2半燃料电池,在0.4mol·L-1H2O2溶液中峰值功率达135mW·cm-2.Nano-sized Au particles were deposited on a nickel foam substrate by a fast spontaneous deposition method using AuCl3 as the source of Au. The effects of AuCl3 concentration and deposition time on the size and distribution of Au particles,and the performance of the obtained Au/Ni electrode as the cathode of Al-H2O2 semi fuel cell were investigated. It was found that after the nickel foam was immersed in a 2 mmol·L-1 AuCl3 solution for 60 s,Au particles with diameters smaller than 100 nm were deposited on its surfaces and cover the surface completely. The Al-H2O2 semi fuel cell with Au/Ni cathode shows a peak power density of 135 mW·cm-2 when operating in 0. 4 mol·L-1 H2O2 solution at room temperature.作者联系地址：哈尔滨工程大学材料科学与化学工程学院;Author's Address: College of Materials Science and Chemical Engineering,Harbin Engineering University, Harbin 150001,Heilongjiang,Chin

Preparation and Electrocatalytic Performance of NiCo2O4/Ni Foam for Hydrogen Peroxide Electrooxidation

本文以水热法结合热处理法原位制备了泡沫镍载 NiCo2O4纳米线电极，使用XRD、SEM和TEM对合成的 NiCo2O4纳米线进行了表征，NiCo2O4纳米线直径约80 nm，长度约 3 ~ 5 μm. 使用循环伏安和计时电流法测试了泡沫镍载NiCo2O4纳米线催化H2O2的电氧化性能，结果表明泡沫镍载NiCo2O4纳米线对H2O2电氧化有着优良的催化活性、稳定性和传质性能，在0.3 V电位下0.4 mol·L-1 H2O2和2 mol·L-1 NaOH溶液中氧化电流可达380 mA·cm-2.The electrodes of Ni foam supported NiCo2O4 nanowires were prepared by hydrothermal method, followed by a thermal treatment in air, and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that the NiCo2O4 nanowires had a diameter of about 50 nm with a length up to 3 ~ 5 μm. The catalytic performances of the Ni foam supported NiCo2O4 nanowires for H2O2 electrooxidation were studied by cyclic voltammetry and chronoamperometry. The results show that the Ni foam supported NiCo2O4 nanowires electrode exhibited superior activity, stability, and mass transport property for H2O2 electrooxidation. A current density of 380 mA·cm-2 was achieved at 0.3 V in 0.4 mol·L-1 H2O2 and 2 mol·L-1 NaOH at room temperature.国家大学生创新训练项目、国家自然科学基金项目（No. 51572052）资助作者联系地址：哈尔滨工程大学材料科学与化学工程学院，黑龙江 哈尔滨 150001Author's Address: College of Material Science and Chemical Engineering, Harbin Engineering University,Harbin 150001, Heilongjiang, China通讯作者E-mail：[email protected]