Journal of the Japan Institute of Energy
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 99 (2020), No. 8

  • Preparation of Graphene-based Conductive Ink from Spent Zinc-carbon Batteries

    pp. 82-87

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.82

    Demands for batteries have been increasing each year globally. This results in an enormous number of waste batteries, especially non-rechargeable types. It can pose severe environmental and health hazards if disposed of improperly. The consumers are generally not aware of how waste batteries should be properly disposed, thus, they usually end up in landfills worsening its risks. Hence, determining a more valuable alternative usage is a sustainable solution. In this study, graphite rods from the waste primary (zinc-carbon) batteries were utilized to produce conductive ink. Graphite rods were systematically removed from the spent batteries, cleaned with acetone to remove the plastic coating, and dried. It was then electrochemically exfoliated by applying 10 V and 2 A while submerged in an H2SO4 solution (1 M). The resulting powders were filtered, rinsed with distilled water until neutral pH, and oven-dried (80 °C). These were then dispersed in silver-ammonia solution and hydrothermally reacted at 150 °C for 5 h. Sodium silicate solution was used as a dispersing medium for the reduced graphene oxide (rGO) powder producing conductive ink. The ink demonstrated a good surface adhesivity, very low resistivity (<30 μΩ∙m), and consistent even after 500 bending cycles. Also, Ag@rGO powder’s morphology, surface characteristics, and physicochemical properties have been evaluated using XRD, Raman, and FE-SEM.
  • Low Sun Spectrum on Simulation of a Thin Film Photovoltaic, Heat Absorber, and Thermoelectric Generator System

    pp. 88-93

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.88

    The research presents the simulation results with Matlab on combining of a type of thin-film photovoltaic module (a-Si), a copper plate heat absorber with thermoelectric generators (TEG) utilizing the standard low-sun spectrum AM1.5G at 0.05, 0.06, 0.07, 0.08, 0.09 and 0.1 Sun as a source of radiation. Amorphous silicon is a type of thin-film solar cell that is more suitable for indoor use so that by using a source of low-intensity light radiation from the sun will still generate electrical energy conversion. Spectrum splitting is used as a cold mirror, which reflects the spectrum of light to the a-Si module in the form of photon energy while transmitting to the TEG module the spectrum of near-infrared light radiation in the form of heat. On the hot side of the TEG, a copper plate was placed to accommodate the heat from light radiation to increase convection heat transfer and temperature differences between the hot and cold sides of the TEG. The simulation results show that the highest efficiency of a-Si module is 3.46% achieved at the lowest spectrum of 0.05 Sun, vice versa TEG is at the highest spectrum at 0.1 Sun and 10.05% its efficiency. This low sun spectrum will be a milestone in the utilization of bulb radiation energy in general domestic needs.
  • One-step Ammonia Synthesis by In-liquid Plasma under Ordinary Temperature and Pressure

    pp. 94-98

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.94

    One-step ammonia synthesis under ordinary temperature and pressure has been attempted by introducing a nitrogen source (pure nitrogen gas or air) to hydrogen production reaction field of in-liquid plasma. As a result of the experiment, it was confirmed that ammonia can be synthesized by this method. However, the amount of ammonia synthesized was small. Most of the produced hydrogen is as pure. Also, the introduced nitrogen source is almost released outside of the reactor. This indicates low ammonia selectivity, study is required to improve the selectivity. The findings of this study are that the hydrogen production efficiency (HPE) and the C O balance of the raw materials affect the amount of ammonia synthesized. It was found that the higher HPE the better. A one to one ratio of C and O was found to be the optimal condition.
  • Methylene Blue Decomposition Via Various In-liquid Plasma Methods

    pp. 99-103

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.99

    At present, the two main wastewater treatment methods are biological treatment and coagulation sedimentation treatment. However, wastewater discharged from dyeing factories cannot be adequately treated because it contains persistent organic substances. The purpose of this study is to develop a treatment for dye wastewater using plasma under atmospheric pressure. The decolorization processing characteristics were investigated using a methylene blue (MB) solution as a model for dye wastewater. The study revealed that an MB solution could be decolorized using plasma treatment, and the conversion rate was correlated to the MB concentration. The discharge method and liquid temperature affected the conversion of MB, and the conversion rates and energy efficiencies were compared for each condition. Additionally, flow-type plasma that took in air from the side of the reaction vessel could treat MB the most efficiently and could be stably operated for considerable time. This process may eventually be used to treat dye wastewater discharged from actual dyeing factories.
  • Comparison of Hydrogen Production Through In-liquid Plasma Methods

    pp. 104-107

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.104

    In this study, hydrogen production by the in-liquid plasma methods reported thus far was compared, to find the optimal method and condition. Because the in-liquid plasma is a type of plasma generated within bubbles in a liquid, an ingredient with a small evaporation enthalpy (EE) is found to be more advantageous. In addition, it is necessary to select an ingredient with a high thermodynamic ideal efficiency (IE), as calculated using the enthalpy of the formation. The actual hydrogen production efficiency (HPE) of water (IE, 0.28 Nm3-H2/kWh; EE, 44 kJ/mol), methanol (IE, 1.26 Nm3-H2/kWh; EE, 38 kJ/mol), n-dodecane (IE, 2.99 Nm3-H2/kWh; EE, 62 kJ/mol), were found to be 0.02, 0.28, and 0.13 Nm3-H2/kWh, respectively. The highest HPE was obtained for the methanol decomposition, indicating that ingredients with low EE and high IE are advantageous for hydrogen production. Moreover, the HPE reduced because most of the energy of the plasma diffused to the surroundings. Therefore, it is essential to develop efficient heat recovery methods and heat insulation systems.
  • Study on Mass Transfer of Ash during Bamboo Powder Combustion

    pp. 108-116

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.108

    In this study, mass transfer of ash during bamboo powder combustion on a flat flame is investigated experimentally and numerically. The bamboo powder combustion consisted of volatiles emission, volatiles combustion, char formation, char combustion, and finally ash formation. The mass of ash formed was about 3 wt% that of raw bamboo powder. The mass of ash decreased with the equivalence ratio Φ for flat flame combustion. Part of the ash fused and then adhered to the Inconel mesh for wrapping of bamboo powder as bottom ash, flowing through the mesh. The mass adhered to the Inconel mesh depended strongly on the equivalence ratio Φ. The fusion tendency of the atmospheric oxidization ash agreed qualitatively with Liu’s standard bamboo ash fusion test. On the other hand, as ash fusion started locally in this work, it suggests that the concentration of metal oxides of the atmospheric oxidization ash was not uniform. For the atmospheric oxidization ash at 600 °C, K2Si2O5, KAlSiO4, Na2CaP2O7, Mg2SiO4, K2SO4, and Fe2O3 were predicted to be the major eutectic materials. At 1120 °C, only Fe2O3 remained and the liquid components accounted for about 95%. On the other hand, the major eutectic materials for the combustion ashes of Φ = 0.85 and Φ = 1.0 at 1260 °C were MgO and Fe2O3, respectively. Therefore, the predicted eutectic materials of the combustion ash were changed appropriately in comparison with those for the atmospheric oxidization ash because of the fusion and disappearance of some metal oxide components during combustion.
  • Effect of Seawater Immersion on Impact Strength of Composites Reinforced Ramie Fiber

    pp. 117-122

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.117

    Composites have absorption properties, namely the ability to absorb water at a specific time. The nature of absorption is a problem because this can reduce the mechanical strength of composites. This study aims to determine the effect of seawater immersion on the impact strength of the composite. The composites used are made of epoxy resin as matrices and ramie fiber as reinforcement. Variation in the orientation of the fibers is given, i.e., continuous and woven fibers. Ramie fiber composites are expected to be able to provide consideration for the primary raw material for shipbuilding so that the composite is carried out on a scale-scale seawater immersion to determine the effect of immersion on impact strength, and immersion is carried out for 0, 2, 4, 6, 8 and 10 weeks. Impact strength testing refers to the ASTM D 5942-96 standard. The results obtained show that the impact strength of unidirectional ramie fiber composites decreased by 30.76% and stronger than ramie’s woven strength composites which decreased by 17.08%. Still, the impact strength on unidirectional ramie fiber composites (150.14 kJ/m2) is more when compared to ramie woven composites (83.26 kJ/m2).
  • Development of De-Oiled Cashew Nut Shell as Fuel Briquettes

    pp. 123-128

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.123

    Converting the de-oiled cashew nut shell into usable products (e.g. briquettes) will address the problem of waste disposal. The study was conducted to develop an environment-friendly fuel briquette sufficient to resist impact during handling and transport and produce the required heat for domestic cooking and also for industrial application. Piston-type and screw-type briquetting machines and three levels of binding agent were used in the production of de-oiled spent cashew shell-based fuel briquettes. The produced briquettes were subject for physicochemical, mechanical and thermal properties tests. Results showed that the best formulation that is required to produce a good quality de-oiled cashew nut shell fuel briquettes using both piston-type and screw type briquetting machines is 10 % binding agent with briquette density, shatter resistance and compressive strength of 0.87 g/cm3 and 0.83 g/cm3, 99.54 and 99.89 % and 43.97 and 101.82 kPa, respectively. The total electricity consumption is 150.91 kWh per ton of briquettes while LPG consumption is 1.32 kg. It is concluded that the energy values and combustion qualities of the briquettes produced in this study are sufficient enough to produce the required heat for domestic cooking and a potential for industrial application.
  • Table of Contents (in English)

    p. 9908tce_1

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.9908tce_1

  • Table of Contents (in Japanese)

    p. 9908tcj_1

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.9908tcj_1

  • Guest editors for Special articles: JCREN

    p. GEJCREN_1

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.99.GEJCREN_1

Article Access Ranking

03 Dec. (Last 30 Days)

  1. Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath ISIJ International Advance Publication
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Determination of Facet Plane and Cleavage Fracture Plane of the Top Dross Formed in a Molten Zinc Bath ISIJ International Advance Publication
  4. Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter ISIJ International Advance Publication
  5. Effect of Microstructure at Coating Layer on Fatigue Strength in Hot-Dip Galvanized Steel ISIJ International Vol.60(2020), No.11
  6. Identification of Cracking Issues and Process Improvements through Plant Monitoring and Numerical Modelling of Secondary Cooling during Continuous Casting of HSLA Steels ISIJ International Advance Publication
  7. Contributions of Grain Size and Crystal Orientation to Fatigue Crack Deflection and Branching Behavior in Low Carbon Steel Plates ISIJ International Advance Publication
  8. Crystal Structure Analysis of Top Dross in Molten Zinc Bath by First Principles Calculation and Synchrotron X-ray Diffraction ISIJ International Advance Publication
  9. Volumetric Strain Dependence of Quantum Diffusion of Hydrogen in bcc Iron ISIJ International Advance Publication
  10. Reaction Behaviors of Mixed Burdens Consisting of Pellets and Sintered Ores in an Experimental Blast Furnace ISIJ International Vol.60(2020), No.11

Search Phrase Ranking

03 Dec. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. steel
  5. bearing 52100 100cr6 rolling contact fatigue
  6. toshihiko emi
  7. toshihiro kitamura
  8. dwtt pressed notch
  9. electromagnetic stirring
  10. fatigue crack path prediction in udimet 720 nickel-based alloy single crystals