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- 주제어 : Mesoporous Ni-NiO (검색결과 5 건)
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Cost-Effective Fabrication of Biomorphic Mesoporous Ni-NiO Microtube for Pseudocapacitors
Binbin Chang,Hang Yin,Zhengyan Gu,Zhikun Li,Baocheng Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
In this paper, a biomorphic mesoporous Ni-NiO microtube was successfully prepared by a facile and cost-effective synthesis strategy using cotton as a biotemplate. The morphology and textural characterization of as-obtained Ni-NiO materials were analyzed by X-ray diffraction patterns, scanning electron microscopy and nitrogen adsorption–desorption technology. The results suggested the as-prepared Ni-NiO samples owned uniform micro-tubular morphology and prominent mesoporous structure. Meanwhile, the effect of annealing temperature on morphology and porosity of Ni-NiO was also investigated. The optimal sample, Ni-NiO-4, exhibited a uniform microtube morphology with an ideal mesoporous structure of a high surface area (15.8 m2 g-1) and suitable mesopore size (9.28 nm). Furthermore, these as-obtained Ni-NiO materials showed enhanced electrochemical property as electrodes for pseudocapacitors. Especially, the Ni-NiO-4 electrode displayed the outstanding capacitive performance, including a high specific capacitance of 98.7 F g-1 at 0.5 A g-1 and satisfactory rate capacity. More importantly, Ni-NiO-4 electrode owned an excellently long-term cycling stability.
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자성에 의해 분리 가능한 메조포러스 카본의 소프트 주형 합성
박성수 ( Sung Soo Park ),하창식 ( Chang-sik Ha ) 한국접착및계면학회 2017 접착 및 계면 Vol.18 No.2
본 연구에서는 잘 배열된 나노세공 구조와 자성체 나노입자를 포함하는 메조포러스 카본(Carbonized Ni-FDU-15)을 합성하였다. Carbonized Ni-FDU-15는 구조형성 주형으로 트리블럭 공중합체(F127)를 이용하고, 카본 세공벽 형성 물질로 resol 전구체를 사용하며 질산 니켈(nickel(II) nitrate)을 금속이온 원으로 사용하여 증발유도 자기조립(Evaporation-Induced Self-Assembly, EISA)과 직접 탄화과정을 거쳐서 합성되었다. 메조포러스 카본은 잘 배열된 이차원적 육방체 구조(2D-hexagonal structure)를 가진다. 한편, 세공벽 내 자성체 나노입자는 니켈(Ni) 금속과 니켈 산화물(NiO)이 생성되었다. 나노입자의 크기는 약 37nm이었다. 그리고 Carbonized Ni-FDU-15의 표면적, 세공크기, 세공부피는 각각 558 m<sup>2</sup>g<sup>-1</sup>, 22.5 A 그리고 0.5 cm<sup>3</sup>g<sup>-1</sup>이었다. Carbonized Ni-FDU-15는 외부에서 자력을 가하였을 때 자력이 가해지는 방향으로 이동함을 확인하였다. 이러한 자성체 담지 메조포러스 카본 물질은 흡착/분리, 자기 저장 매체, 자성 유체(ferrofluid), 자기 공명 영상(MRI) 및 약물 타겟팅 등의 광범위한 응용 분야에 높은 응용성을 가질 것으로 기대된다. In this study, we synthesized mesoporous carbon (Carbonized Ni-FDU-15) containing nanoporous structures and magnetic nanoparticles. Carbonized Ni-FDU-15 was synthesized via evaporation-induced self-assembly (EISA) and direct carbonization by using a triblock copolymer (F127) as a structure-directing agent, a resol precursor as a carbon-pore wall forming material, and nickel (II) nitrate as a metal ion source. The mesoporous carbon has a well-ordered two-dimensional hexagonal structure. Meanwhile, nickel (Ni) metal and nickel oxide (NiO) were produced in the magnetic nanoparticles in the pore wall. The size of the nanoparticles was about 37 nm. The surface area, pore size and pore volume of Carbonized Ni-FDU-15 were 558 m<sup>2</sup>g<sup>-1</sup>, 22.5 A and 0.5 cm<sup>3</sup>g<sup>-1</sup>, respectively. Carbonized Ni-FDU-15 was found to move in the direction of magnetic force when magnetic force was externally applied. The magnetic nanoparticle-bearing mesoporous carbons are expected to have high applicability in a wide variety of applications such as adsorption/separation, magnetic storage media, ferrofluid, magnetic resonance imaging (MRI) and drug targeting, etc.
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Abbas, Syed Asad,Jung, Kwang-Deog Elsevier 2016 ELECTROCHIMICA ACTA Vol.193 No.-
<P><B>Abstract</B></P> <P>Nickel oxide with a high surface area showing high capacitance is reported here. Mesoporous microspheres (MMS) of 250NiO, 300NiO, 350NiO, 400NiO and 500NiO are synthesized by calcining mesoporous α-Ni(OH)<SUB>2</SUB> at 250°C, 300°C, 350°C, 400°C, and 500°C, respectively. The mesoporous α-Ni(OH)<SUB>2</SUB> was prepared by a hydrothermal method. 250NiO has the highest specific surface area of 295m<SUP>2</SUP>/g, and a high specific capacitance of 1,140Fg<SUP>⿿1</SUP> at a current density of 10Ag<SUP>⿿1</SUP> from galvanostatic discharge measurements. The cyclic voltammetry, galvanostatic discharge measurement and electrochemical impedance analysis exhibited that the pseudocapacitive behavior is more clarified for NiO prepared at higher calcination temperature. Apparently, the high specific capacitance of 250NiO results from the mesoporous pores and high specific surface area enhancing the transportation of ions during the charging and discharging process to store high energy. The power density and energy density of the 250NiO are 2.5kWkg<SUP>⿿1</SUP> and 59W h kg<SUP>⿿1</SUP> respectively at the current density of 10Ag<SUP>⿿1</SUP>.</P>
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Jeong, M.G.,Kim, D.H.,Lee, S.K.,Lee, J.H.,Han, S.W.,Park, E.J.,Cychosz, K.A.,Thommes, M.,Hwang, Y.K.,Chang, J.S.,Kim, Y.D. Elsevier 2016 Microporous and mesoporous materials Vol.221 No.-
<P>Mesoporous chromium terephthalate MIL-101 was modified with NiO via atomic layer deposition (ALD) process using bis(cyclopentadienyl)nickel (Ni(Cp)(2)) as a metal precursor and O-2 as an oxidizing agent, respectively. Based on the results of transmission electron microscopy (TEM), N-2 and Ar isotherms, X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-atomic emission spectroscopy (ICPAES), we show that the deposited NiO nanoparticles were distributed inside internal mesoporous cages as well as on the external surface of MIL-101(Cr). Studies using in situ X-ray photoelectron spectroscopy show that NiO selectively occupied ligand sites without affecting metal sites of MIL-101. The NiO deposition using ALD enhanced thermal stability of MIL-101 compared to that without NiO and provided catalytic activity for CO oxidation, i.e., ALD provided novel chemical functionality to the metal-organic frameworks (MOFs). (C) 2015 Elsevier Inc. All rights reserved.</P>
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Facile Route to an Efficient NiO Supercapacitor with a Three-Dimensional Nanonetwork Morphology
Kim, Sun-I,Lee, Jung-Soo,Ahn, Hyo-Jin,Song, Hyun-Kon,Jang, Ji-Hyun American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.5
<P>NiO nanostructures with three distinct morphologies were fabricated by a sol–gel method and their morphology-dependent supercapacitor properties were exploited. The nanoflower- shaped NiO with a distinctive three-dimensional (3D) network and the highest pore volume shows the best supercapacitor properties. The nanopores in flower-shaped nanostructures, offering advantages in contact with and transport of the electrolyte, allow for 3D nanochannels in NiO structure, providing longer electron pathways. The XPS and EIS data of the NiO nanostructure confirm that the flower-shaped NiO, which has the lowest surface area among the three morphologies, was effectively optimized as a superior electrode and yielded the greatest pseudocapacitance. This study indicates that forming a 3D nanonetwork is a straightforward means of improving the electrochemical properties of a supercapacitor.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-5/am3021894/production/images/medium/am-2012-021894_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am3021894'>ACS Electronic Supporting Info</A></P>
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