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| 1 | Probing the active sites of 2D nanosheets with Fe-N-C carbon shell encapsulated Fe_(x)C/Fe species for boosting sodium-ion storage performances显示文摘Developing stable but high active metal-nitrogen-carbon(M-N-C)-based hard carbon anode is a promising way to be the alternatives to graphene and blank hard carbon for sodium-ion batteries(SIBs),requiring the precise tailoring of the electronic structure for optimizing the Na+intercalation behavior,yet is greatly challenging.Herein,Fe-N-C graphitic layer-encapsulating Fe3C species within hard carbon nanosheets(Fe-N-C/Fe3C@HCNs)are rationally engineered by pyrolysis of self-assembled polymer.Impressively,the Fe-N-C/Fe3C@HCNs exhibit outstanding rate capacity(242 mAh·g^(−1)at 2,000 mA·g^(−1)),which is 2.1 and 4.2 times higher than that of Fe-N-C and N-doped carbon(N-C),respectively,and prolonged cycling stability(176 mAh·g^(−1)at 2,000 mA·g^(−1)after 2,000 cycles).Theoretical calculations unveil that the Fe3C species enhance the electronic transfer from Na to Fe-N-C,resulting in the charge redistribution between the interfaces of Fe3C and Fe-N-C.Thus,the optimized adsorption behavior towards Na+reduces the thermodynamic energy barriers.The synergistic effect of Fe3C and Fe-N-C species maintains the structural integrity of electrode materials during the sodiation/desodiation process.The in-depth insight into the advanced Na+storage mechanisms of Fe3C@Fe-N-C offers precise guidance for the rational establishment of confinement heterostructures in SIBs. | Huicong Xia Pengfei Yuan Lingxing Zan Gan Qu Yunchuan Tu Kaixin Zhu Yifan Wei Zeyu WeiFangying Zheng Mo Zhang Yongfeng Hu Dehui Deng Jianan Zhang | 2022 | Nano Research2022，15，8： | 1 |
| 2 | Mechanism of interfacial effects in sodium-ion storage devices显示文摘Rechargeable sodium-ion batteries(SIBs)are considered as the next-generation secondary batteries.The performance of SIB is determined by the behavior of its electrode surface and the electrode–electrolyte interface during charging and discharging.Thus,the characteristics of these surfaces and interfaces should be analyzed to realize large-scale energy storage systems with high energy density and long-cycle stability.Although various studies have investigated the properties of electrode materials,few studies have focused on the construction of stable and efficient SIB interfaces,and even fewer have explored the mechanisms of interfacial effects;however,the strategies of regulating interfacial effects are yet to be completely developed.Moreover,the results obtained thus far are insufficient to draw systematic conclusions.The present study reviews the literature on the mechanism of interfacial effects in Na+storage devices.The interfaces in a sodium-ion storage device include a heterogeneous interface between electrode materials,a solid electrolyte interphase,and a cathode electrolyte interphase.The interfacial effects during the intercalation,transformation,and alloy reactions and the resulting overall battery performance were theoretically analyzed.In this review,we aim to provide a theoretical basis for optimizing the structures of electrode surface and electrode–electrolyte interface to optimize the performance of SIBs.In addition,the challenges of investigating interfacial effects and several possible helpful methods and opportunities for studying the mechanisms of interfacial effects in SIBs will be presented. | Yifan Wei Lingxing Zan Huicong Xia Wenfu Yan Jia-Nan Zhang | 2024 | Nano Research2024，17，3： | 0 |
| 3 | Antioxidant induced bulk passivation for efficient and stable hole transport layer-free carbon electrode perovskite solar cells显示文摘Defect passivation is one of the important strategies to improve the efficiency and stability of perovskite solar cells.In this work,2,6-di-tert-butyl-4-methylphenol(BHT)as antioxidant was introduced into the perovskite precursor solution to improve the quality of the prepared perovskite films,so that these films performed a larger and uniform grain size.Moreover,the-OH functional group in BHT interacts with I-,thus reducing the density of defect states and inhibiting the non-radiative recombination.The presence of hydrophobic groups in BHT protects the film from moisture erosion and improves the long-term stability of PSCs devices.The maximum photoelectric conversion efficiency of the constructed ITO/SnO_(2)/BHTMAPbI_(3)/Carbon device is 16.88%,and the unpackaged cell maintains the initial efficiency of 99.3%after698 h of storage under the environmental condition of 30%humidity.This work provides an efficient approach to improve the performance of printable hole transport layer-free carbon electrode perovskite solar cells. | Yetai Cheng Qingbo Wei Nannan Wang Zhangwen Ye Yanbin Zhao Qiongyao Wang Depeng Chu Lingxing Zan Feng Fu Yucheng Liu | 2023 | Chinese Chemical Letters2023，34，6： | 0 |
| 4 | Direct conversion of N_(2) and O_(2):status,challenge and perspective显示文摘As key components of air,nitrogen(N_(2))and oxygen(O_(2))are the vital constituents of lives.Synthesis of NO_(2),and C-N-O organics direct from N_(2) and O_(2),rather than from an intermediate NH_(3)(known as the Haber-Bosch process),is tantalizing.However,the extremely strong N≡N triple bond(945 kJ mol-1)and the nonpolar stable electron configuration of dinitrogen lead to its conversion being extensively energy demanding.The further selective synthesis of high-value C-N-O organics directly from N_(2),O_(2) and C-containing molecules is attractive yet greatly challenging from both scientific and engineering perspectives.Enormous efforts have been dedicated to the direct conversion of N2 and O2 via traditional and novel techniques,including thermo chemical,plasma,electrochemical,ultrasonic and photochemical conversion.In this review,we aim to provide a thorough comprehension of the status and challenge of the direct conversion of N2,O2 and C-containing molecules(particularly N2 and O2).Moreover,we will propose some future perspectives to stimulate more inspiration from the scientific community to tackle the scientific and engineering challenges. | Di Li Lingxing Zan Shiming Chen Zhang-Jie Shi Ping Chen Zhenfeng Xi Dehui Deng | 2022 | National Science Review2022，9，12： | 0 |
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