Showing papers in "Rare Metals in 2020"

TL;DR: In this article, the authors present a comprehensive and critical summary on the recent progress in the Mo-based electrodes for hydrogen evolution reaction (HER) including molybdenum alloys.

TL;DR: In this article, the phase composition, microstructure and mechanical properties of Sialon ceramics were studied and it was shown that the addition of Fe, Co and Ni greatly promoted the nitridation process of Si, Al and Al2O3 powders with the transition metals (Fe, Co, Ni) catalysts.

TL;DR: In this paper, the microstructure and electrochemical performance of hard carbon materials pyrolyzed from different parts of plants at different temperatures is summarized. And a full scope of plant-derived hard carbon anode materials and a guideline for the design of high performance hard carbon for sodium ion anodes for SIBs is provided.

TL;DR: Li et al. as discussed by the authors presented a brief review of the atomic-scale characterization in Li-ion batteries, including Li (de)insertion mechanism (both cations and anions charge-compensation mechanism), migration of transition metal ions, and surface phase transition.

TL;DR: In this paper, a melt polymerization strategy was developed to synthesize iron-polyphthalocyanine (FePPc) metallic-organic frameworks (MOFs) over the carbon black matrix.

TL;DR: In this article, a facile, sustainable and cost-effective strategy for preparing heteroatom-doped porous activated carbon (PAC) derived from biomass palm kernel shell (PKS) was developed for high performance LSB applications.

TL;DR: In this paper, a self-supported three-dimensional NiCoP nanoparticles embedded in NiCoO2 nanowires (NiCoO 2/NiCoP) electrode consisting of nickel cobalt phosphides with high activity and nickel Cobalt oxides with good stability were fabricated by a hydrothermal and phosphorization method.

TL;DR: In this paper, the authors comprehensively summarized important progresses achieved to date in suppressing Li dendrite growth, including porous structured hosts, fabricating artificial solid electrolyte interface (SEI) layers, introducing electrolyte additives, using solid-state electrolytes and applying external fields.

TL;DR: In this article, the authors synthesize nickel oxide nanoparticles (NiO-NPs) by the sol-gel method, which involved the use of salvia macrosiphon Boiss plant extract, Ni(NO3)2·6H2O as a capping agent, and a nickel precursor, respectively.

TL;DR: In this paper, the effect of morphologies and particle sizes, the energy storage mechanisms, and the electrochemical performances of FeS2 as anode for alkali-ion batteries (LIBs, SIBs, and PIBs) are summarized.

TL;DR: In this article, the authors summarized the recent research progresses on alloy-based materials in KIBs and provided new insight into designing of high-activity electrode materials for KIB and beyond.

TL;DR: In this article, the effect of the hierarchically porous loose sponge-like structure on the formation dynamics of solid electrolyte interphase (SEI), and related properties, was studied via cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT), X-ray photoelectron spectroscope (XPS), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroopy (EIS) analysis.

TL;DR: In this article, the latest advance in the related alloy-based anodes for PIBs was overviewed and the correlations among the morphology and potassium storage performance, phase transition mechanisms, the formation of solid electrolyte interphases and ionic transport kinetics were critically discussed.

TL;DR: In this article, a composite of Co3O4 nanoparticles confined in three-dimensional (3D) N-doped porous carbon (Co-NpCs) was prepared by a simple freeze-drying and in situ pyrolysis method.

TL;DR: In this article, N and P-doped carbon-carbon nanotube CoP (NPC-CNTs-CoP) nanoparticles dodecahedra are achieved by multistep calcination of the Zndoped zeolitic imidazolate framework ZIF-67 precursor (ZnCo-ZIF).

TL;DR: In this paper, the authors introduce two types of non-collinear spin structures, i.e., the chiral spin structure that yields real-space Berry phases and the coplanar nonlinear spin structure, and then move to relevant novel physical phenomena including topological Hall effects, anomalous Hall effect, multiferroic, Weyl fermions, spin-polarized current and spin Hall effect without spin-orbit coupling.

TL;DR: In this article, the authors highlight various types of metal catalysts that possess great potential in several catalytic reactions, including metal oxides, nanoporous metals and metal NPs supported on metal-organic frameworks (MOFs) and zeolites.

TL;DR: In this paper, the effects of pin geometry and number of passes on macrostructure, microstructure and wear rate of 6061-T6 aluminum alloy surface composites fabricated via friction stir processing (FSP) were discussed by reinforcement particles of silicon carbide (SiC).

TL;DR: In this paper, the effect of different substrates, including silicon wafers, glass slides and copper plates, on the photothermal catalytic performance of commercial Ni catalysts was investigated.

TL;DR: In this paper, a flexible NO2 gas sensor with porous structure graphene on polyethylene terephthalate substrates operating at room temperature was demonstrated, which exhibited good performance with response of 1.2% and a fast response time within 30 seconds after exposure to 50'×'10−9 NO2.

TL;DR: In this article, the authors summarized the progress in their fabrication techniques and mechanical/thermal properties of typically rare earth-contained T/EBCs, together with their anti-corrosion performance under the condition of molten salts or oxides (such as, Na2SO4, V2O5 and NaVO3), calcium-magnesium-alumina-silicate (CMAS) and high-temperature water vapor.

TL;DR: In this article, several transition metal (TM) atoms doped on phosphorene were studied as N2 fixation electrocatalysts by using density functional theory (DFT) calculations.

TL;DR: In this article, the photocatalytic properties of CeO2-Nb2O5 photocatalyst in heterogeneous photocatalysis (under ultraviolet and visible radiation) and in Fentonlike process were reported.

TL;DR: In this article, an advanced nitrogen-doped mesoporous carbon (NMC) composite (NiCo2O4/CoNx-NMC), formed from a mixture of Co- and Ni-hydroxide-infiltrated phenolic resin and melamine resin, was reported.

TL;DR: In this article, a precipitant-free hydrothermal methodology for mass production of spindle-like CoCO3/reduced graphene oxide (S-CoCo3/rGO) toward advanced lithium-ion batteries as a hybrid anode was explored.

TL;DR: In this article, a small grain size and carbon modification can improve the pseudocapacitive effect of the Ti2Nb10O29/C nanoparticles, leading to an excellent rate capacity, especially at high current rate.

TL;DR: In this article, a LiFePO4-type lithium secondary battery cell of 8Ah capacity with high energy density and power density was developed for hybrid electric vehicle (HEV) applications by optimizing the key raw materials and process design.

TL;DR: In this article, onion-like graphitic carbon materials are obtained by using carbon quantum dots as precursors after sintering, and the effects of alkali metal salts on the structure, morphology and performance of the samples are focused.

TL;DR: In this article, Yang et al. showed that high Na-content P2-type layered oxides exhibit higher capacities as well as great structural stability, which can be attributed to the lower average oxidation state and the raised 3d eg* level of TMs.

TL;DR: In this paper, the authors systematically fabricated 63 Nd0.8Sr0.2NiOx (NSNO) thin films at a wide range of oxygen partial pressures on various oxide substrates and found no signature of superconductivity in all the 63 thin-film samples.