Figure 2 - uploaded by Meng Li
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Figure 2 (A) Stable structure of CuO (-110) surface with five H atoms adsorption. (B) Adsorption of the sixth H atom leads to the formation of an H2O molecule that spontaneously desorbs from the surface, resulting in an oxygen vacancy. Blue, red, pink, and gray balls represent Cu, O, H, and O vacancy, respectively.
Source publication
In-situ Atomic-scale Visualization of Autocatalytic Reduction of CuO with H2 - Xianhu Sun, Dongxiang Wu, Wenhui Zhu, Meng Li, Wei-Chang Yang, Stephen House, Xiaobo Chen, Renu Sharma, Judith Yang, Guangwen Zhou
Contexts in source publication
Context 1
... upon the oxygen loss from terraces. Densityfunctional theory calculations suggest a favorable sequential pathway of forming oxygen vacancies in the subsurface and the associated diffusion barriers [4]. The accumulation of oxygen vacancies in the subsurface facilitates the diffusion and the following departure of lattice oxygen from terraces (Fig. 2), therefore speeding up the oxide reduction. These results demonstrate the important effect of sub-surface dynamics on the surface reaction kinetics. ...
Context 2
... upon the oxygen loss from terraces. Densityfunctional theory calculations suggest a favorable sequential pathway of forming oxygen vacancies in the subsurface and the associated diffusion barriers [4]. The accumulation of oxygen vacancies in the subsurface facilitates the diffusion and the following departure of lattice oxygen from terraces (Fig. 2), therefore speeding up the oxide reduction. These results demonstrate the important effect of sub-surface dynamics on the surface reaction kinetics. ...
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Citations
... Figure 10 shows the crystal structure of CuO and Cu. During the reduction of CuO, H adsorbs on the surface of CuO, and O in CuO of monoclinic system is taken away by H to form Cu with face-centered cubic structure [35]. The reduction of CuO to Cu results in a 42.3% increase in volume contraction so that decreases lattice size and decline surface coverage. ...
A new evaporative crystallization method was used to plate copper on water-soluble NaCl particles. Cu(NO3)2·3H2O was crystallized on NaCl particles by the heated ethanol volatilization, and then thermally decomposed to obtain CuO coating which was finally reduced to Cu coating. The affecting factors of coating effect and the influence of copper-plated NaCl particles on the pores structure of infiltrated AlSi12 foam were studied. The thermal oxidation pretreatment of NaCl particles increased the number of oxygen-containing functional groups and the uniform distribution of thermal etch pits, which improved the bonding strength between NaCl particles and Cu(NO3)2·3H2O coating. The addition of Tween-60 and PEG-6000 inhibited the micro-dissolution of NaCl particles in ethanol and promoted the formation of complete CuO coating. Infiltrated AlSi12 foam prepared from copper-plated NaCl particles had a more homogeneous pore structure and smaller pore size deviations than infiltrated AlSi12 foam obtained with uncoated NaCl particles, indicating that copper plating significantly improved the wettability of NaCl particles and AlSi12 alloy melt. This paper presents a new and low-cost surface treatment method, which provides a useful reference for the surface modification and application of water-soluble particles.
