• Title/Summary/Keyword: Nickel hydroxide

Search Result 29, Processing Time 0.081 seconds

A study on the synthesis of fine nickel hydroxide crystalline powder using the taylor fluid flow

  • Park, Il-Jeong;Kim, Dae-Weon;Jung, Hang-Chul
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.27 no.5
    • /
    • pp.268-273
    • /
    • 2017
  • In this study, nickel hydroxide crystalline powders were synthesized by continuous reaction in the taylor fluid flow using nickel chloride, nickel sulphate and sodium hydroxide as raw materials and compared with those prepared by a conventional batch type reaction. The crystallinity of nickel hydroxide prepared by the Taylor fluid flow reaction was higher than that of nickel hydroxide obtained by batch reaction. The particle size of nickel hydroxide decreased about 2.5 to 3.6 times, and the specific surface area was increased.

Electrochemical Behaviors of the Surface-Treated Nickel Hydroxide Powder and Electrolyte Additive LiGH for Ni-MH Batteries (니켈수소전지용 수산화니켈 입자의 표면처리와 전해액 첨가제 LiOH의 전기화학적 거동)

  • Kim, Ho-Sung;Oh, Ik-Hyun
    • Journal of the Korean Electrochemical Society
    • /
    • v.11 no.2
    • /
    • pp.115-119
    • /
    • 2008
  • Single particle of nickel hydroxide and the surface-treated one with cobalt element were performed to review the effect of LiOH additive in alkaline electrolyte for Ni-MH batteries using microelectrode test system. As a result of cyclic voltammetry, the electrochemical behaviors such as the oxidation/reduction and oxygen evolution reaction are clearly observed for a single particle of nickel hydroxide, respectively. Furthermore, the reduction current peak of nickel hydroxide added with LiOH in electrolyte was very low and broad compared with the normal nickel hydroxide without an additive LiOH, which had a bad effect to the crystallization structure of nickel hydroxide. However, it was found that capacity and cycle properties of the nickel hydroxide treated with cobalt greatly increased by the addition of LiOH.

Fabrication of High-Density Nickel Hydroxide Powder-I (고밀도 수산화니켈 분말의 제조에 관한 연구-I)

  • 신동엽;조원일;신치범;조병원;강탁;윤경석
    • Journal of the Korean institute of surface engineering
    • /
    • v.28 no.2
    • /
    • pp.92-100
    • /
    • 1995
  • To increase the capacity of positive electrode materials for matching the high capacity negative electrode materials in alkaline rechargeable batteries, high-density nickel hydroxide powders were made through a continuous process from nickel sulfate reacted with ammonia and sodium hydroxidc. The effect of operating conditions on structure, shape, size distribution, apparent density and tap density of powders were investigated. Crystal structure of nickel hydroxide powder was hcp according to Bravais Lattice. The increase of mean residence time promoted the growth of (101) plane. The shape of powder was nearly spherical. Their size was in the range of $2~50\mu\textrm{m}$. The size distribution of the powders prepared was narrower than that of commercially obtained nickel hydroxide. Apparent density and tap density were 1.6~1.7g/cc and 2.0~2.1g/cc, respectively.

  • PDF

PREPARATION OF NICKEL HYDROXIDE FOR NICKEL-CADMIUM CELL

  • Sasaki, Yasushi;Yamashita, Tsugito
    • Journal of the Korean institute of surface engineering
    • /
    • v.29 no.6
    • /
    • pp.724-727
    • /
    • 1996
  • Electrolytic impregnation of nickel hydroxide into porous sintered nickel plaque from various nickel solutions were carried out at room or high temperatures and current density range of 2.5mA $cm^{-2}$ to 25mA $cm^{-2}$. The morphology of the deposited surface was observed with an electron microscope and the surface products were analyzed by means of X-ray diffraction method. Nickel hydroxide was deposited in nickel nitrate electrolyte, while deposits from sulphate or chloride solutions were almost metallic nickel. The loading level of nickel hydroxide from nitrate solutions was 1.6g$cm^{-3}$ void volume and the appearance of the surface was good quality. Discharge capacity of prepared electrodes in nickel nitrate electrolyte was larger than that of the others bath. It was considered that the cell capacity was dependent on the surface roughness of active material.

  • PDF

Enhanced Electrochromic Switching Performance in Nickel Hydroxide Thin Film by Ultra-Thin Ni Metal (니켈금속 박막에서 수산화 니켈 박막의 전기변색속도 개선)

  • Kim, Woo-Seong;Seong, Jeong-Sub
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.7 no.2
    • /
    • pp.163-167
    • /
    • 2002
  • Improved optical switching property of electrochromic nickel hydroxide/nickel glass thin film is reported. Nickel metal film was deposited on glass by e-beam evaporation before following electrochemical redox cycling to form nickel hydroxide for electrochromic activation. Without ITO (indium tin oxide) layer as electrical conductor, this electrode showed more rapid coloration rate than nickel hydroxide film on ITO substrate in the change of the electric voltage and optical transmittance. XPS analysis confirmed the existence of ultra-thin nickel metal layer (${\sim}10{\AA}$) between electrochemically grown nickel hydroxide and the glass substrate. It is concluded that the remained nickel metal nano-layer attribute to the conduction layer and the enhanced response time.

  • PDF

Quantitative estimation of reversibility of the discharge process undergone by nickel hydroxide film cathodically deposited on pure nickel as a positive supercapacitor electrode using cyclic voltammetry and potential drop method

  • Pyun Su-Il;Moon Sung-Mo
    • Journal of the Korean Electrochemical Society
    • /
    • v.1 no.1
    • /
    • pp.8-13
    • /
    • 1998
  • This work presents the way how to evaluate the degree of reversibility of the discharging process undergone by the nickel hydroxide film cathodically deposited on pure nickel as a positive electrode for electrochemical capacitor using the combined cyclic voltammetry and potential drop method, supplemented by galvanostatic discharge and open-circuit potential transient methods. The time interval necessary just to establish the current reversal of anodic to cathodic direction from the moment just after applying the potential inversion of anodic to cathodic direction, was obtained on cyclic voltammogram. The cathodic charge density passed upon dropping the applied potential, was calculated on potentiostatic current density-time curve. Both the time interval and the cathodic charge density in magnitude can be regarded as being measures of the degree of reversibility of the discharging process undergone by the positive active material for supercapacitor, i.e. , the longer the time interval is, the lower is the degree of reversibility and the greater the cathodic charge density is, the higher is the degree of reversibility. From the applied potential dependences of the time interval and cathodic charge density, discharge at $0.42 V_{SCE}$ was determined to be the most reversible.

Recovery of Nickel from Electroless Plating Wastewater by Electrolysis Method (전기분해법(電氣分解法)을 이용(利用)한 무전해(無電解) 니켈 도금폐액(鍍金廢液)으로부터 니켈 회수(回收))

  • Lee, Hwa-Young
    • Resources Recycling
    • /
    • v.21 no.2
    • /
    • pp.41-46
    • /
    • 2012
  • An investigation on the recovery of nickel from spent electroless plating solutions has been performed using the electrowinning method. For this aim, nickel in spent electroless plating solutions was separated as nickel hydroxide through the addition of caustic soda. Nickel hydroxide was completely dissolved with sulfuric acid and an electrolysis was performed for electrowinning of nickel from nickel solutions. As a result, it was found that more than 99% of nickel in spent electroless plating solutions could be precipitated as nickel hydroxide above pH 10 with the addition of caustic soda. As far as the current efficiency in electrowinning of nickel was concerned, it was decreased with increase in the current density.

Inhalation Exposure to Nickel Hydroxide Nanoparticles Induces Systemic Acute Phase Response in Mice

  • Kang, Gi-Soo;Gillespie, Patricia Anne;Chen, Lung-Chi
    • Toxicological Research
    • /
    • v.27 no.1
    • /
    • pp.19-23
    • /
    • 2011
  • It has been proposed that acute phase response can be a mechanism by which inhaled particles exert adverse effects on the cardiovascular system. Although some of the human acute phase proteins have been widely studied as biomarkers of systemic inflammation or cardiovascular diseases, there are only a few studies that investigated the role of serum amyloid P (SAP), a major acute phase protein in mice. In this study, we investigated the changes in SAP, following inhalation exposure to nickel hydroxide nanoparticles (nano-NH). We conducted 1) acute (4 h) exposure to nano-NH at 100, 500, and $1000\;{\mu}g/m^3$ and 2) sub-acute (4h/d for 3d) exposure at $1000\;{\mu}g/m^3$, then measured serum SAP protein levels along with hepatic Sap mRNA levels. The results show that inhaled nano-NH can induce systemic acute phase response indicated by increased serum SAP levels and hepatic Sap mRNA levels. To the best of our knowledge, this is the first study showing induction of SAP in response to repeated particle exposure, and the results suggest that SAP can be used as a biomarker for systemic inflammation induced by inhaled particles.

Surface observation of Ni(OH)2 nanosheets fabricated by electrodeposition method (전착법에 의해 제작된 Ni(OH)2 나노 시트의 표면 관찰 및 분석)

  • Kim, Dong Yeon;Son, Injoon;Choi, Mun-Hyun
    • Journal of the Korean institute of surface engineering
    • /
    • v.54 no.3
    • /
    • pp.152-157
    • /
    • 2021
  • The pseudocapacitor has a high energy density characteristic because it accumulates charges through a paradic redox reaction. However, due to its strong insulation properties, metal hydroxides should be designed as structural systems optimized for charge transfer to support fast electron transport. Also, Nickel material is weak to heat and is easily deformed when used as a cathode material, so stability must be secured. In this study, nickel hydroxide was produced by electrodeposition to secure the stability of nickel. Electrodeposition is a synthetic method suitable for growing optimized nickel hydroxide because it allows fine control. Nickel hydroxide (Ni(OH)2) is a metal hydroxide used as a pseudocapacitor anode due to its high capacitance, electrical conductivity and resistance. Therefore, in order to determine how Ni(OH)2 nanosheets are formed and what are the optimization conditions, various measurement methods were used to focus on structural growth of nanosheets produced by electrodeposition.