Three-dimensional porous phosphorus-graphdiyne as a universal anode material for both K- and Ca-ion batteries with high performance
JOURNAL OF POWER SOURCES
Authors: Muhammad, Imran; Younis, Umer; Wu, Wei; Xie, Huanhuan; Khaliq, Abdul; Sun, Qiang
Motivated by the recent synthesis of 2D boron-graphdiyne and P-doped graphdiyne, for the first time we report a 3D porous phosphorus-graphdiyne (termed 3D-PGDY) with an ultra-low mass density of 0.48 g cm3, which is stable thermally and dynamically. Moreover, the unique bonding environment of sp-hybridizing provide multiple adsorption sites for K and Ca ions, and the uniformly distributed pores provide the channel for ion transport, exhibiting ultrahigh specific capacity of 1064.56 (2129.12 mAhg 1), low diffusion barriers of 0.1 (0.35 eV), the low open-circuit voltage of 0.27 (0.35 V), and small volume expansion of 2.43 (2.32%) for K (Ca) ion. These outstanding properties demonstrate that assembling graphdiyne into 3D porous structures is very promising for developing novel battery materials. Superscript/Subscript Available
Simultaneous photocatalytic degradation of ibuprofen and H-2 evolution over Au/sheaf-like TiO2 mesocrystals
Authors: Yao, Xiaxi; Hu, Xiuli; Liu, Yi; Wang, Xuhong; Hong, Xuekun; Chen, Xuefeng; Pillai, Suresh C.; Dionysiou, Dionysios D.; Wang, Dawei
Considerable effort has been devoted to the efficient degradation of pharmaceuticals and personal care products (PPCPs), while the chemical energy in these processes has been widely overlooked. In this study, we demonstrated the simultaneous hydrogen production and ibuprofen degradation through heterogeneous photocatalysis. By anchoring Au nanoparticles (NPs) on the (101) surface of sheaf-like TiO2 mesocrystals with  orientation, efficient charge separation is achieved, which is essential for the photocatalytic redox reactions. XPS analysis showed that the binding energies of Ti 2p and O is indicated no shift after Au addition. Peaks observed at 81.8 and 85.5 eV due to Au 4f(7/2) and Au 4f(5/2) of metallic gold on the surface of Au/meso-TiO2, confirmed the formation of Au NPs. The as-synthesized anatase TiO2 mesocrystals are composed of small nanocrystals with a size of 8 nm and exhibit the uniform sheaf-like morphology along  orientation. As expected, the 1 wt% Au/TiO2 mesocrystals shows the largest photocurrent density, highest H-2-evolution rate, and fastest photodegradation rate of ibuprofen under simulated sunlight irradiation among all the studied catalyst. Furthermore, the effect of solution pH, common anions (Cl-, NO3-, and SO42-) and cations (Na+, K+, and Ca2+) on photocatalytic H-2 evolution and degradation of ibuprofen were individually investigated and discussed. A mechanism for the simultaneous photocatalytic hydrogen generation and degradation of ibuprofen has also been proposed. This work opens up new opportunities for the development of energy efficient techniques for PPCPs degradation. (C) 2020 Elsevier Ltd. All rights reserved.