Jinnuo Yang,Wenqiang Ai,Lingke Li,Shilong Dong,Jiahui Lv,Ruiqi Wang,Yang Liu,Lei Zu,Huiqin Lian
Sodium-ion batteries (SIBs) offer great viability for extensive energy storage due to their abundance, low cost, and excellent safety. In this study, we investigate the relationship between P–O–C bonds content and electrochemical performance of black phosphorus–hard carbon–carbon nanotubes (BP-HC-CNTs) composite anode. A series of composites are prepared via ball milling, in which the relative P–O–C bonds content is modulated by varying the HC to CNTs ratio, and the effect of different relative P–O–C bond contents on the electrochemical performance of the materials is systematically investigated. The findings indicate that tuning the HC to CNTs ratio alters the chemical bonding degree between phosphorus and carbon, specifically the P–O–C bond content, which positively correlates with enhanced electrochemical performance. Notably, the composite with the highest P–O–C content (36 %) exhibits superior performance compared to those with lower bond contents: The specific capacity is approximately 2.9 times higher after 600 cycles at 6.0 A g ⁻¹ , and after 2000 cycles at 15.0 A g ⁻¹ , it is about 5.7 times higher. These results demonstrate excellent rate capability and cycling stability. Therefore, we propose that adjusting the hard carbon/carbon nanotubes ratio effectively regulates P–O–C bonds formation, which is essential for improving interfacial stability and electrochemical kinetics.
Lingbo Liu,Ling Lei,Keni Zeng,Kangbing Wu,Nianjun Yang
Red phosphorus (RP) is a promising electrochemical sensing material owing to its abundant surface groups and reactive sites. In this study, a sodium dodecyl sulfate-assisted phosphorus-amine approach is employed to tune surface chemistry of RP nanoparticles. During the transition of the polyphosphorus-amine anion to RP, the cleavage of P O P bond and the formation of P O C bond are monitored by in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy. The formed P O C bonds that are originated from the P O reactive sites are theoretically revealed with the density functional theory calculations, charge density difference, and X-ray photoelectron spectroscopy. The energies of optimized aromatic and aliphatic P O C bonds are −2.51 and −2.65 eV, respectively. To explore electrochemical sensing applications, RP nanoparticles are in situ grown on single-walled carbon nanotube (SWCNT). Such a stable RP/SWCNT suspension is applied to fabricate the RP/SWCNT integrated arrays via a template-filtration method. Such an array is efficient for sensitive and selective monitoring of p-phenylenediamine on hair dyes. This study provides insights into surface chemistry of RP, its roles in electrochemical sensing applications, and an approach to produce high-performance RP sensors at large scales.
危险品化学品经营许可证（带存储）