Carbon-rich boron carbide in the eutectic product synthesized by resistance heating of B2CN in graphite

He, Julong; Shen, Zeyu; Wu, E.; Liu, Z.Y.; He, Liu; Guo, Licong; Wu, Qinghua; Luo, Xiaoguang; Hu, Qicheng; Li, D.C.; Yanagisawa, Osamu; Tian, Yongjun

doi:10.1016/j.jallcom.2006.07.097

Cited by 18 publications

(6 citation statements)

References 35 publications

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“…All the samples having HCN were annealed at 900°C for 20h showed a sharp graphitized (or graphitic) carbon peak at ∼26°2θ degree, which is well-known peak assigned to the (002) diffraction of graphitic carbons and having a hexagonal structure with P63/mmc space group, indexed with PDF# 04-015-2407). [40][41][42] The sulfur peak at ∼26°2θ degree, overlaps with the carbon peak (25.93°2θ degree) in the all three samples. MnO 2 coated S@HCN1 and S@HCN2 cathode samples showed a typical MnO 2 having a tetragonal symmetry with a P42/mnm space group (indexed by PDF#04-005-4881).…”

Section: Resultsmentioning

confidence: 79%

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

Yong

Dünya

Küçük

et al. 2019

J. Electrochem. Soc.

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When comes to very high energy density energy storage systems, the prospect of lithium-sulfur battery (LSB) technology is very promising. The major problem that prevents the commercial production of LSBs is their poor cycling life caused by the migration of polysulfide intermediates from the cathode structure to the anode. Confining sulfur and the discharged polysulfide intermediates inside conductive porous carbon matrices is regarded as a promising and effective strategy to overcome this problem. In this study, a new class of MnO 2 -coated sulfur-filled hollow carbon nanosphere (HCN)-based cathode materials has been prepared to improve the electrochemical performance of Li-S Cells. The cathode materials constructed with silica nanoparticle hard templates displayed a high initial capacity of 834 mAh g −1 with a capacity fading rate of 0.080% per cycle. This material also showed superior redox kinetics, which enabled the Li-S cells to run at a higher charging-discharging current density.

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Section: Resultsmentioning

confidence: 79%

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

Yong

Dünya

Küçük

et al. 2019

J. Electrochem. Soc.

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“…This dynamic equilibrium results in a high concentration of the In 3 Pd 2 −InPd/In 2 O 3 interface in contact with the gas phase, 38 InPd, 43 In 3 Pd 2 , 50 and graphite. 51 The graphite reflections after catalysis are caused by graphite used to dilute the active material.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…The insets show the magnified reflections in the shown 2 theta range. Additionally shown are the calculated patterns of In 2 O 3 ,38 InPd,43 In 3 Pd 2 ,50 and graphite 51. The graphite reflections after catalysis are caused by graphite used to dilute the active material.…”

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confidence: 99%

Proving a Paradigm in Methanol Steam Reforming: Catalytically Highly Selective In_xPd_y/In₂O₃ Interfaces

et al. 2020

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Methanol steam reforming provides clean hydrogen by onboard production, which can directly be used for fuel cell applications−while using appropriate catalysts. In x Pd y /In 2 O 3 aerogels exhibit excellent CO 2 selectivities of 99%. This is caused by the active participation of chemically bound oxygen from the material as proven by isotope-labeling experiments. In addition, the dynamic, temperature-dependent equilibrium between intermetallic and oxidic species has a strong impact on the catalytic properties of the material. Thus, the intermetallic compounds in close proximity to a supporting reducible oxide act as selectivity-decisive redox centers, enabling a Mars-van Krevelen mechanism, which is responsible for the excellent selectivity toward CO 2 .

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“…(b) XRD patterns of the material after being subjected to MSR at 400 °C with a non-stoichiometric reactant composition. Additionally shown are the calculated patterns of In 2 O 3 , In 2 Pt, In 3 Pt 2 , In 7 Pt 3 ,In,45 and graphite,46 which was used as a diluent.…”

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confidence: 99%

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

et al. 2021

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Hydrogen storage in the form of small molecules and subsequent release are foreseen to play a fundamental role in future energy systems or carbon cycles. Methanol is an ideal hydrogen carrier due to the high H/C ratio, the lack of C–C bonds, and being liquid under ambient conditions. Methanol steam reforming is an advantageous reaction for the release of the chemically bound hydrogen. Pd- or Pt-based intermetallic compounds have shown to be CO2-selective and long-term stable catalytic materials. However, an intrinsic understanding of the underlying processes is still lacking. In this study, we show that the redox activity in the In–Pt system can be steered by gas-phase changes and leads to highly active catalytic materials at 300 °C [1500 mol (H2)/(mol (Pt) × h)] with an excellent CO2 selectivity of 99.5%, thus clearly outperforming previous materials. Reactive transformations between In2Pt, In3Pt2, and In2O3 have been identified to cause the high selectivity. Redox activity of intermetallic compounds as part of the catalytic cycle was previously unknown and adds an understanding to the concept of different adsorption sites.

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Carbon-rich boron carbide in the eutectic product synthesized by resistance heating of B2CN in graphite

Cited by 18 publications

References 35 publications

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

Proving a Paradigm in Methanol Steam Reforming: Catalytically Highly Selective In_xPd_y/In₂O₃ Interfaces

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

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Carbon-rich boron carbide in the eutectic product synthesized by resistance heating of B2CN in graphite

Cited by 18 publications

References 35 publications

MnO2-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

MnO2-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

Proving a Paradigm in Methanol Steam Reforming: Catalytically Highly Selective InxPdy/In2O3 Interfaces

Unprecedented Catalytic Activity and Selectivity in Methanol Steam Reforming by Reactive Transformation of Intermetallic In–Pt Compounds

Contact Info

Product

Resources

About

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

MnO₂-Coated Sulfur-Filled Hollow Carbon Nanosphere-Based Cathode Materials for Enhancing Electrochemical Performance of Li-S Cells

Proving a Paradigm in Methanol Steam Reforming: Catalytically Highly Selective In_xPd_y/In₂O₃ Interfaces