Nickel cobalt sulfide anchored in crumpled and porous graphene framework for electrochemical energy storage

Tiruneh, Sintayehu Nibret,Kang, Bong Kyun,Kwag, Sung Hoon,Humayoun, Usama Bin,Yoon, Dae Ho ELSEVIER 2018 CURRENT APPLIED PHYSICS Vol.18 No.supp

<P>Energy storage is becoming highly important as renewable generation sources are added to the mix in electrical power generation and distribution systems. Supercapacitors and batteries could allow renewables to overcome intermittency difficulties by regulating the voltage, frequency, and phase angle of the power. Transition-metal oxide, hydroxide, and sulfide forms, carbonaceous materials, and conducting polymers can be used as electrodes for supercapacitors. Graphene is considered to be a promising material for supercapacitors because of its high surface area and theoretical gravimetric capacitance. However, aggregation of graphene sheets severely decreases the accessible surface area and theoretical gravimetric capacitance. Here we report a unique synthesis route of a hybrid nickel cobalt sulfide anchored in a crumpled and porous graphene framework to address the aforementioned problem. The hybrid sample, a nickel cobalt sulfide/crumpled-porous graphene framework, delivered higher specific capacitance and better electronic conductivity than the porous graphene framework when used as a supercapacitor electrode. (C) 2017 Elsevier B.V. All rights reserved.</P>

Influence of Nickel Layer on Electromagnetic Interference Shielding Effectiveness of CuS-Polyacrylonitrile Fibers

임윤지,백윤미,박수진 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.12

In this study, highly conductive nickel/copper sulfide-polyacrylonitrile (Ni/CuS-PAN) fibers were prepared by electroless nickel plating on CuS-PAN fibers. The electromagnetic interference (EMI) shielding properties of the Ni/CuS-PAN fibers were investigated as a function of nickel-plating time. X-ray photoelectron spectroscopy and X-ray diffraction analyses were performed to examine the surface properties of the prepared Ni/CuS-PAN. The surface morphology of the Ni/CuS-PAN fibers was observed using scanning electron microscopy. The volume resistivity of the samples was measured using a four-point probe electrical resistivity tester, and the EMI shielding effectiveness (EMI-SE) was tested using an EMI shielding analyzer. The EMI-SE of the Ni/CuS-PAN fibers was significantly improved compared with those of the as-received CuS-PAN fibers. In addition, the EMI-SE generally increased as the nickel-plating time increased, with the highest EMI-SE of the 50-Ni/CuS-PAN being approximately 45?dB at 2.05?GHz. The nickel layer was a key factor in determining the EMI-SE of the Ni/CuS-PAN fibers.

Morphology controlled synthesis of 2-D Ni–Ni3S2 and Ni3S2 nanostructures on Ni foam towards oxygen evolution reaction

CHAUDHARINITIN KADUBA,Oh Aram,Sa Young Jin,Jin Haneul,백현석,Kim Sang Gu,이석중,주상훈,Lee Kwangyeol 나노기술연구협의회 2017 Nano Convergence Vol.4 No.7

Catalysts for oxygen evolution reactions (OER) are at the heart of key renewable energy technologies, and development of non-precious metal catalysts with high activity and stability remain a great challenge in this field. Among various material candidates, metal sulfides are receiving increasing attention. While morphology-dependent catalytic performances are well established in noble metal-based catalysts, relatively little is known for the morphology‒catalytic performance relationship in metal sulfide catalysts. In this study, uniform spider web-like Ni nanosheets–Ni3S2 and honeycomb-like Ni3S2 structures are deposited on nickel foam (Ni3S2/NF) by a facile one-step hydrothermal synthetic route. When used as an oxygen evolution electrode, the spider web-like Ni–Ni3S2/NF with the large exposed surface area shown excellent catalytic activity and stability with an overpotential of ~310 mV to achieve at 10 mA/cm2 and a Tafel slope of 63 mV/dec in alkaline media, which is superior to the honeycomb-like structure without Ni nanosheet. The low Tafel slope of the spider web-like Ni–Ni3S2/NF represents one of the best OER kinetics among nickel sulfide-based OER catalysts. The results point to the fact that performance of the metal sulfide electrocatalysts might be fine-tuned and optimized with morphological controls.

The addition of iron to Ni₃S₂ electrode for sodium secondary battery

Kim, Jong-Seon,Cho, Gyu-Bong,Kim, Ki-Won,Ahn, Jou-Hyeon,Wang, Guoxiu,Ahn, Hyo-Jun Elsevier 2011 CURRENT APPLIED PHYSICS Vol.11 No.1

<P><B>Abstract</B></P><P>In order to investigate the role of iron additive in the Ni<SUB>3</SUB>S<SUB>2</SUB> electrode, the Ni<SUB>3</SUB>S<SUB>2</SUB> electrode was prepared by addition of iron. The discharge properties of Na/Ni<SUB>3</SUB>S<SUB>2</SUB> cells using 1M NaCF<SUB>3</SUB>SO<SUB>3</SUB> in tetra(ethylene glycol)dimethyl ether liquid electrolyte were investigated at room temperature. The Na/Ni<SUB>3</SUB>S<SUB>2</SUB> cell had an initial discharge capacity of 400 mAh g<SUP>−1</SUP> with a plateau potential at 0.84 V versus Na/Na<SUP>+</SUP>. The discharge capacity decreased to 255 mAh g<SUP>−1</SUP> after 15 cycles. Iron additive in Ni<SUB>3</SUB>S<SUB>2</SUB> electrode played a role as a conductive agent and did not form iron sulfide during charging.</P> <P><B>Highlights</B></P><P>► It was reported that Na/Ni<SUB>3</SUB>S<SUB>2</SUB> cell showed a high capacity and good cycle life. ► Since iron is an electric conductor and iron-sulfide is a good active material for sodium battery, we prepare Ni<SUB>3</SUB>S<SUB>2</SUB> electrode by addition of iron powder. ► Iron powder in the Ni<SUB>3</SUB>S<SUB>2</SUB> electrode plays a role as a conductive agent and does not form iron sulfides.</P>

Efficient hydrogen evolution performance of phase-pure NiS electrocatalysts grown on fluorine-doped tin oxide-coated glass by facile chemical bath deposition

Rahman, Gul,Chae, Sang Youn,Joo, Oh-shim Elsevier 2018 International journal of hydrogen energy Vol.43 No.29

<P><B>Abstract</B></P> <P>The production of hydrogen, the future fuel, on stable, efficient, and robust electrocatalysts represents an attractive approach for the conversion and storage of carbon-free energy resources. In this study, earth-abundant nickel sulfide (NiS) electrocatalyst were grown on fluorine-doped tin oxide (FTO) substrate by a simple and cost-effective chemical bath deposition for hydrogen evolution reaction (HER). Energy dispersive X-ray analysis and X-ray photoelectron spectra indicated the presence of highly pure NiS. The HER performance of the catalyst was examined in alkaline solution (1.0 M NaOH; pH = 13.5). Notably, NiS film prepared at 100 °C demonstrated superior HER activity with an overpotential of 290 mV to afford a current density of 10 mA/cm<SUP>2</SUP> and a Tafel slope of 143.4 mV/dec which are among the promising results obtained for sulfide-based HER electrocatalysts. The catalyst exhibited 100% faradaic efficiency and electrochemical stability which indicate its potential as noble-metal-free HER electrocatalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Earth-abundant NiS electrocatalysts were grown via simple chemical bath deposition. </LI> <LI> Their HER activity was tested in alkaline electrolyte. </LI> <LI> The prepared NiS showed high H<SUB>2</SUB> production at low applied potential. </LI> <LI> The catalyst were found to be stable and efficient when tested for 5 h electrolysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Earth-abundant NiS catalysts were prepared via cost-effective and facile chemical bath deposition that demonstrated efficient electrocatalytic response at low overpotential for hydrogen evolution reaction (HER).</P> <P>[DISPLAY OMISSION]</P>

High Temperature Oxidation and Sulfidation of Ni-15at.%W Coatings

Chanwou Kim,Teayoul You,Yuriy Shapovalov,Jaehwang Ko,Dongbok Lee,Kyuhwan Lee,Doyon Chang,Dongsoo Kim,Sikchol Kwon 한국표면공학회 2005 한국표면공학회지 Vol.38 No.1

Ni-15at. %W coatings with film thicknesses of 20-40 ㎛ were electroplated on a steel substrate, and their oxidation behavior was investigated at 700 and 800℃ in air. For comparison, a pure Ni coating and a bulk Ni were also oxidized. The Ni-15at. %W coating displayed the worst oxidation resistance, due to the formation of less-protective NiO, Fe₂O₃, NiFe₂O₄and NiWO₄. The corrosion behavior Ni-15at.%W coatings electroplated on a steel substrate was similarly investigated at 700 and 800℃ in the Ar-1%SO₂ atmosphere. For comparison, the uncoated steel substrate was also corrosion-tested in the Ar-1%SO₂ atmosphere. Severe scale spallation and the internal corrosion of the steel that occurred in the uncoated substrate were not observed in the coated specimen. However, it seemed that the Ni-15at.%W coating cannot be a potential candidate as a sulfidation-resistant coating, due to the formation of less-protective NiO, NiS, WO₃ and NiWO₄.

Carbon Sphere@Nickel sulfide core-shell nanocomposite for high performance supercapacitor application

A. Simon Justin,P. Vickraman,B. Joji Reddy 한국물리학회 2019 Current Applied Physics Vol.19 No.3

The Carbon sphere@Nickel sulfide core-shell nanocomposites for different mole ratios of Carbon sphere (0:1; 0.5:1 and 1:1) have been synthesized by a facile low temperature water-bath method without any further calcination. XRD studies on the core-shell nanocomposites show that characteristic peaks associated with rhombohedral phase structure of nickel sulfide have been retained. TEM morphology presents the interlinked coreshell of Carbon sphere@Nickel sulfide composite with grass-leaf dexterity for better ionic diffusion. BET study confirms the formation of mesoporous structure with high surface area. The existence of elements and its electronic configuration is noted through XPS. The electrochemical studies on pristine nickel sulfide and its Carbon sphere@Nickel sulfide core-shell composites reveal that Carbon sphere@Nickel sulfide (0.5:1) exhibits high specific capacitance of 1022 F g−1 at a current density of 1 A g−1. It shows good cyclic performance even beyond 4000 consecutive charge/discharge cycles at a relatively high current density of 20 A g−1 with the ∼83% of retention.

Highly effective nickel sulfide counter electrode catalyst prepared by optimal hydrothermal treatment for quantum dot-sensitized solar cells

Gopi, Chandu V.V.M.,Srinivasa Rao, S.,Kim, Soo-Kyoung,Punnoose, Dinah,Kim, Hee-Je Elsevier 2015 Journal of Power Sources Vol.275 No.-

<P><B>Abstract</B></P> <P>Nickel sulfide (NiS) thin film has been deposited on a fluorine-doped tin oxide substrate by a hydrothermal method using 3-mercaptopropionic acid and used as an efficient counter electrode (CE) for polysulfide redox reactions in quantum dot-sensitized solar cells (QDSSCs). NiS has low toxicity and environmental compatibility. In the present study, the size of the NiS nanoparticle increases with the hydrothermal deposition time. The performance of the QDSSCs is examined in detail using polysulfide electrolyte with the NiS CE. A TiO<SUB>2</SUB>/CdS/CdSe/ZnS-based QDSSC using the NiS CE shows enhanced photovoltaic performance with a power conversion efficiency (PCE) of 3.03%, which is superior to that of a cell with Pt CE (PCE 2.20%) under one sun illumination (AM 1.5, 100 mW cm<SUP>−2</SUP>). The improved photovoltaic performance of the NiS-based QDSSC may be attributed to a low charge transfer resistance (5.08 Ω) for the reduction of polysulfide on the CE, indicating greater electrocatalytic activity of the NiS. Electrochemical impedance spectroscopy, cyclic voltammetry, and Tafel-polarization measurements were used to investigate the electrocatalytic activity of the NiS and Pt CEs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nickel sulfide is used as counter electrode of quantum dots-sensitized solar cell. </LI> <LI> Nickel sulfide shows superior electro-catalytic activity than Pt. </LI> <LI> The content of sulfur in nickel sulfide thin film depends on the deposition time. </LI> <LI> The QDSSC using NiS CE yield a high PCE value of 3.03%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Rapid growth of NiSx by atomic layer infiltration and its application as an efficient counter electrode for dye-sensitized solar cells

조상호,김홍범,성명모 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-

Nickel sulfide (NiSx) was grown by atomic layer infiltration using bis(dimethylamino-2-methyl-2-butoxo)nickel(II) [Ni(dmamb)2] and hydrogen sulfide (H2S) as a metal precursor and a sulfur source. Thesteady-state growth rate of thefilm was 3.7 Å/cycles at 160–190 C which was much faster compared tothose by conventional atomic layer deposition method (<0.7 Å/cycles). This nickel sulfide thinfilms werecharacterized by taking X-ray photoelectron spectroscopy, scanning electron microscopy, X-raydiffraction, and hall measurements. The depositedfilms on Si wafer was single-phase polycrystallinewith multiple domains. The NiSx film grown onfluorine-doped tin oxide (FTO)-coated glass was appliedto a counter electrode in dye-sensitized solar cells, which performed a high catalytic activity for thereduction of I3to I and the comparable cell efficiency of 7.12% with cells using conventional Pt-coatedFTO counter electrode.

Enhancement of Elemental Sulfur Recovery from Wastewater Biogas Using Nickel (II)-(5,10,15,20)-tetrakis-phenylcarboxylporphyrin

Chun-Yin Lau,Jianyu Guan,Ho-Yin TSE,Chi Shun Yeung,Chiu Wing Shum,Shao-Yuan Leu 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.5

Sulfide control is a vital issue affecting the regional air quality and operational safety in sewage treatment processes. The conventional sulfide removal techniques are sophisticated industrial processes which require large operational footprint or are related to hazardous chemicals. In this study, the performance of elemental sulfur recovery from a simple micro-aeration process with metal-TCPP ((5,10,15,20)-tetrakis-p-carboxyphenylporphyrin) was investigated through laboratory experiments. A minimum of fourfold enhancement of elemental sulfur recovery was achieved from sulfide dissolved wastewater with the addition of nickel (II) TCPP, which demonstrated the highest among seven various types of transition metal-porphyrin complexes in the 3d block elements. The optimized reaction conditions resulted in 72.53% sulfur recovery with the addition of only 4.5 ppm nickel into the solution. The catalyst significantly improves the recyclability and life-cycle of the water-based absorbent and provides benefits to odor control and resource recovery.