Currently, Pt single atoms as promising electrocatalysts have been applied to electrocatalysis aiming significantly improve performance and remarkably lower usage of the noble metal. Herein, we propose a photochemical solid-phase reduction method fabricate well-defined isolated on nitrogen-doped porous carbon (Pt1/NPC). Using this simple fast synthesis strategy, formed are well-dispersed without clusters or nanoparticles. The loading is up 3.8 wt % relative carbon. Pt1/NPC catalyst displays...

Tb 3 + – Yb codoped transparent oxyfluoride glass ceramics containing CaF2 nanocrystals were synthesized. The formation of in the was confirmed by x-ray diffraction and high resolution transmission electron microscopy. incorporation Tb3+ Yb3+ into nanocrystal lattice energy dispersive spectroscopy. Infrared quantum cutting involving 950–1100nm (F5∕22→F7∕22) emission achieved upon excitation D45 level at 484nm. photoluminescence properties have been studied for these ceramics. concentration...

Ferromagnetic Mn5Ge3 thin films were grown on Ge(111) with solid-phase epitaxy. The epitaxial relationship between the alloy film and substrate is Mn5Ge3(001)//Ge(111) [100]Mn5Ge3//[11̄0]Ge. exhibit metallic conductivity strong ferromagnetism up to Curie temperature, TC=296 K. These are promising candidates for germanium-based spintronics.

The formation processes of barrier anodic alumina (BAA) and porous (PAA) are discussed in detail. anodizing current J(T) within the oxide includes ionic j(ion) electronic j(e) during process. is used to form an give rise oxygen gas or sparking. results from impurity centers oxide. For a given electrolyte, dependent on independent J(T). nanopores can be ascribed evolution Oxygen will begin released at critical thickness d(c). manner development PAA accordance with that BAA. differences...

Abstract One-dimensional anodic titanium oxide (ATO) nanotube arrays hold great potential as photoanode for photoelectrochemical (PEC) water splitting. In this work, we report a facile and eco-friendly electrochemical hydrogenation method to modify the electronic PEC properties of ATO films. The hydrogenated (ATO-H) electrodes present significantly improved photocurrent 0.65 mA/cm 2 in comparison with that pristine nanotubes (0.29 ) recorded under air mass 1.5 global illumination. incident...

Here we propose amorphous CuPt alloy hollow nanotubes as efficient catalysts for the methanol oxidation reaction (MOR) prepared by Na2S2O3-assisted galvanic replacement reaction. The formation mechanism can be explained nanoscale Kirkendall-effect-induced hollowing process of electrochemical tests suggest that exhibits better MOR activity and stability than crystalline commercial Pt/C catalysts, which ascribed to enhanced CO tolerance ability alloy. XPS measurements demonstrate anti-CO...

One-dimensional anodic titanium oxide (ATO) nanotube arrays hold great potential as electrode materials for high-performance electrochemical supercapacitors. However, their poor electronic conductivity limits practical applications. Here, we develop a hydrogen (H2) plasma treatment method to greatly improve the performance of ATO electrodes. Compared with pristine ATO, nanotubes treated by H2 illumination (ATO-H) present rough and amorphous layer at surface simultaneously incorporated Ti3+...

One-dimensional anodic titanium oxide nanotube (TONT) arrays provide a direct pathway for charge transport, and thus hold great potential as working electrodes electrochemical energy conversion storage devices. However, the prominent surface recombination due to large amount defects hinders performance improvement. In this work, states of TONTs were passivated by conformal coating high-quality Al2O3 onto tubular structures using atomic layer deposition (ALD). The modified TONT films...

Achieving synergy between inexpensive metals and metal oxides is a key challenge for the development of highly active, economical composites as next-generation catalysts oxygen reduction reaction (ORR). We have synthesized dispersed Ag Mn3O4 nanocrystals covalently coupled with carbon black via simple thermal decomposition AgNO3 Mn(NO3)2 precursors at elevated temperatures. The resulting are located separately on carbon, but in close proximity to each other. Electrocatalysis experiments an...

Near-infrared quantum cutting involving the emission of near-infrared photons by downconversion cooperative energy transfer from Eu2+ to Yb3+ in borate glasses was reported. Electron spin resonance spectra and absorption were measured prove existence glasses. Excitation, emission, fluorescence decay measurements performed examine occurrence ions. concentration dependent efficiency calculated maximum approaches 164.19%.

Magnetoelectric materials which simultaneously exhibit electric polarization and magnetism have attracted more attention due to their novel physical properties promising applications for next-generation devices. Exploring new with outstanding magnetoelectric performance, especially the manipulation of magnetization by field, is great importance. Here, we demonstrate cross-coupling between magnetic orders in polycrystalline Co4Nb2O9, not only magnetic-field-induced but also field control...

Constructing nanoscale hybrid materials with unique interfacial structures by using various metal oxides and carbon supports as building blocks are of great importance to develop highly active, economical catalysts for oxygen reduction reaction (ORR). In this work, La2O2CO3 encapsulated La2O3 nanoparticles on a black (La2O2CO3@La2O3/C) were fabricated via chemical precipitation in an aqueous solution containing different concentrations cetyltrimethyl ammonium bromide (CTAB), followed...

Anodic TiO2 nanotubes have been studied extensively for many years. However, the growth kinetics still remains unclear. The systematic study of current transient under constant anodizing voltage has not mentioned in original literature. Here, a derivation and its corresponding theoretical formula are proposed to overcome this challenge. In paper, expressions time dependent ionic electronic derived explore process Ti. current-time curves different voltages temperatures experimentally...

Spherical perovskite-type bismuth ferritic nanocrystals with diameters of 10–50 nm and hexagonal-shaped sillenite-type ones sizes 18–33 were synthesized at low temperatures by microwave hydrothermal process. Their structural, optical, photocatalytic properties investigated. The single-crystalline nature the as-synthesized was confirmed X-ray diffraction, selected area electron high-resolution transmission microscopy. photoelectron spectroscopy investigations show that Fe element exists as...

Anodic TiO2 nanotubes (NTs) have been studied extensively for many years. However, the growth kinetics still remains unclear, because it is hardly derived by direct in situ methods. Here, an interesting approach proposed to overcome this challenge. A combinatorial anodization was exploited monitor pore initiation and nanotube under a preformed compact surface layer (CSL). The CSL NTs (UCSL-NTs) were formed fluoride-free fluoride-containing electrolytes, respectively. forming process of...

To investigate the formation mechanism of anodization and to clarify relationship between reaction process actual structure, we fitted current density–time curve based on MATLAB. A time-varying function C(t) is introduced optimize total fitting equation used describe constant voltage process, which makes more in line with real kinetic model ionic electronic current. Besides, a new algorithm developed trust region method, can effectively improve effect through iteration. In our work, initial...