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Wang Yanzong,Ma Yihan,Zhang Qinfang,Huang Rui,Gao Benling,Li Zhongwen,Li Guannan,Liang Feng 한국물리학회 2022 Current Applied Physics Vol.41 No.-
The electrochemical performances of the V2CSe2 MXene as anode materials for Na, K, Mg, Ca, and Al-ion batteries have been systematically investigated by the first-principles method. The adsorption energies of metal atoms show that Na, K, and Ca atoms can effectively adsorb on the V2CSe2, except for Mg and Al atoms. The large diffusion constants for Na, K, and Ca atoms calculated by the diffusion energy barriers (0.098 eV for Na, 0.066 eV for Ca, and 0.24 eV for Ca) indicate the high mobility on the V2CSe2 surface. Significantly, the maximum theoretical capacities of V2CSe2 reach up to 394.12 mA h/g for Na and Ca ions. Furthermore, the low average open-circuit voltage (OCV) (0.150 V for Na, 0.175 V for K, and 0.072 V for Ca) indicates the V2CSe2 is a suitable anode material. These results provide fundamental guidance for the V2CSe2 monolayer as anode materials of non-lithium metal-ion batteries.
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Nguyen, Dinh Cung Tien,Zhu, Lei,Zhang, Qinfang,Cho, Kwang Youn,Oh, Won-Chun Elsevier 2018 Materials research bulletin Vol.107 No.-
<P><B>Abstract</B></P> <P>To promote outstanding qualities of mesoporous silica and enhance photocatalytic activity of CdSe and silica nanoparticles, the combination of SiO<SUB>2</SUB> nanoparticles from silica precursor with CdSe-graphene nanoparticles was processed under catering of cetyltrimethylammonium bromide (CTAB) and sodium lauryl sulfate (SLS) as the surfactant template. The as-synthesized sample exhibited highly efficient photocatalytic effects for treatment of MB and RBB organic dye solutions at optimum conditions for this study, including pH and catalyst dosage, were at pH 11 for MB dye solution case and pH 3 for RBB dye solution case and initial amount was 0.05 g catalyst for both cases. Besides, hydrogen generation of SiO<SUB>2</SUB>/CdSe-graphene was markedly higher than that of binary CdSe-graphene nanocomposite under ambient conditions with/without methanol 20% sacrificing reagents at room temperature. The SiO<SUB>2</SUB>/CdSe-graphene nanocomposite is capable of photocatalytic degradation of different organic dyes under visible light irradiation as well as for developing efficient hetero-system for hydrogen production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The SiO<SUB>2</SUB>/CdSe-graphene material is capable of photocatalytic degradation of different organic dyes under visible light irradiation. </LI> <LI> The large surface area of silica was provided a large response surface with a large quantity of reactions centers that needed H<SUB>2</SUB> generation. </LI> <LI> High H<SUB>2</SUB> generation can be attributed to the effective charge carrier system and a good charge transferability of graphene decorated with SiO<SUB>2</SUB>, and CdSe semiconductors. </LI> <LI> The ternary catalyst holds promise to become a new potential photocatalyst for developing efficient hetero-system for hydrogen production. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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