Surface engineering on MnO - Springer
2024年5月23日 · Transmission electron microscopy (TEM) images of MnO 2 (Fig. S1) and La SAs@MnO 2 (Fig. 1d) display similar morphology in nanorods with tens of nanometers in diameter and hundreds of nanometers in length, demonstrating unchanged morphology after surface engineering.
Adjacent single-atom irons boosting molecular oxygen activation on MnO
2021年9月14日 · In this study, we demonstrate that dual adjacent Fe atoms anchored on MnO 2 can assemble into a diatomic site, also called as MnO 2 -hosted Fe dimer, which activates molecular oxygen to form an...
Energy-driven surface evolution in beta-MnO 2 structures
2017年6月8日 · Here, combining aberration-corrected scanning transmission electron microscopy (STEM) and high-resolution TEM, we revealed a mutual energy-driven mechanism between beta-MnO2 nanowires and microstructures that dominated the evolution of …
In-situ reconstructed Ru atom array on α-MnO
2021年12月17日 · Here, we report an electrocatalyst with Ru-atom-array patches supported on α-MnO 2 (Ru/MnO 2) for the oxygen evolution reaction following a mechanism that involves only *O and *OH species as...
MnO 2 Nanowire/Biomass-Derived Carbon from Hemp Stem for …
2017年5月8日 · Here we report a facile, inexpensive, and scalable strategy for the fabrication of hierarchical porous 3D structure as electrode materials for supercapacitors based on MnO 2 nanowires and hemp-derived activated carbon (HC).
Cations controlled growth of β-MnO2 crystals with tunable facets …
2018年6月1日 · Combining aberration-corrected scanning transmission electron microscopy (STEM), ultramicrotomy, and dynamic functional theory (DFT) simulation, we clarified that the β-MnO 2 crystals were formed through a direct solid-state phase transition process.
Ordering Heterogeneity of [MnO6] Octahedra in Tunnel
2019年2月20日 · In situ STEM of a Na + insertion experiment also reveals for the first time the non-uniform ion transport kinetics within one MnO 2 nanoparticle featuring tunnel intergrowths. Findings of this work reveal the existence of tunnel structural heterogeneity and the variation of energy storage properties at single-nanoparticle level.
密歇根理工大学NanoEnergy可控合成具有不同晶面的MnO2晶体用 …
结合球差扫描透射电子显微镜（STEM），超薄切片和DFT模拟，发现β-MnO2晶体是通过固态相变过程直接形成的。 增加前驱体中钾离子的浓度可逐渐将β-MnO2从双锥体棱镜（ {100} {111}面）转变为八面体结构（ {111}面）。 钾离子是通过影响α-K0.5Mn4O8中间产物的形核和随后的相变来控制β-MnO2的形态。 利用β-MnO2晶体作为锂离子电池的正极，结果表明高度暴露的 {111}面使β-MnO2晶体具有更好的倍率性. 能。 这一工作揭示了一种新的调控过渡金属氧化物晶体形态的 …
原位TEM动态揭示氧化锰原子尺度隧道结构中锂存储机制 – 化学慧
本文通过调整实验方法，首次证明了所合成的 Mg 2+ 掺杂的 τ-MnO 2 纳米棒 4×3 隧道结构，并通过球差校正透射电子显微镜（TEM）进行揭示。 随后，利用原位透射电子显微镜观察 τ-MnO 2 纳米棒锂化-去锂化的循环过程。 通过高分辨技术实时动态追踪锂化行为，并用电子衍射（ED）和电子能量损失谱（EELS）来确定反应相的微观结构。 同时，采用相场模拟揭示了嵌锂和脱锂的相结构演变动力学。 图文解析. 首先，使用 HAADF-STEM 鉴定了 τ-MnO 2 横向和轴向的基本原子 …
STEM analysis of discharged α-MnO2 nanowires a–d
Rechargeable aqueous Zn–MnO2 technology combines one of the oldest battery chemistries with favourable sustainability characteristics, including safety, cost and environmental compatibility....