2023年9月2日 · Herein, an all-non-noble W/WO 2 metallic heterostructure serving as an efficient solid-acid catalyst exhibits remarkable hydrogen evolution reaction performance with an ultra-low overpotential of...

In this work, a facile oxidation strategy was developed to prepare novel tungsten disulfide/tungsten trioxide (WS2/WO3) heterostructures for adsorbing organic dyes efficiently by combining the...

1995年12月29日 · The catalytic activity of WO2 is attributed to the presence of a certain density of states of the 5d, 6s electrons present at the Fermi-level on the W4+ cation and observed in the XPS of the valence band energy region of WO2.

2022年9月1日 · In this work, we developed a 3D porous WO 2 /WS 2 -rGO network while urchin-like microspheres self-assembled by WO 2 /WS 2 heterogeneous nanosheets and wrapped by rGO network, demonstrating superior rate properties and cycling stability as the anode of sodium-ion batteries (SIBs).

XPS 光谱解读. W4f 区域具有明显的自旋轨道分裂峰 (Δ 金属 =2.17 eV)。 钨金属的能量损失特征峰出现在 37 eV 处，WO 3 的能量损失特征峰出现在 42 eV 处。钨金属的能量损失特征峰与 WO3 4f 峰重叠。 钨金属 W4f 区域的谱峰峰形不对称。 钨化合物（如钨氧化物）的 W4f 峰 ...

报告了 WO3、WO2、W (0)、WC、W (0) + O2 和 WC + O2 在不同实验条件下的 XPS。 在相对纯的 W (0) 和 WC 表面上观察到产生甲烷的主要产品的 2-甲基戊烷的广泛氢解反应。 在 WO2 或部分氧化的 W (0) 和 WC 表面上观察到相同反应物的异构化反应，而本体 WO3 在反应开始时没有表现出任何催化反应性。 WO2 的催化活性归因于在 W4+ 阳离子的费米能级上存在一定密度的 5d、6s 电子，并在 WO2 价带能区的 XPS 中观察到。 这种通过 H2 和本体 WO3 或存在于 W (0) 或 …

1997年1月1日 · Rich oxygen vacancies (OVs) in WO2 NRs play a fundamental role in MOA induced catalytic H2 evolution reaction, because they guarantee the favorable chemisorption of molecular O2 on catalyst...

It was revealed that these commercial MoO 2 and WO 2 samples are partially oxidized on the surface to the more stable MoO 3 and WO 3 states respectively, with the presence of Mo (V) and W (V) in the interfaces. In Situ reduction of these samples, by hydrogen at different temperatures enabled to reduce MoO 3 or WO 3 to lower oxidation states.

2016年1月13日 · We demonstrate that the introduction of hydrogen to the argon carrier gas dramatically improves the optical quality and increases the growth area of WS 2, resulting in films exhibiting mm 2...

W4f X-ray photoelectron spectroscopy (XPS) spectra of WO2.72 prepared by reduction at 650 °C under CO atmosphere. [...] In this work, novel WO3-x/polyurethane (PU) nanocomposites were prepared...