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Nano Energy
Elsevier
Nano Energy

Elsevier

2211-2855

Nano Energy/Journal Nano EnergyEISCIISTP
正式出版
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    Modulation of pore-size in N, S-codoped carbon/Co9S8 hybrid for a stronger O2 affinity toward rechargable zinc-air battery

    Zheng, QiXiong, YingTang, KunWu, Mingzai...
    8页
    查看更多>>摘要：The architecture of the electrode material is a significant factor during the optimization of electrocatalyst. To determine the role of architecture, we synthesize a series of interconnected N, S-codoped Carbon/Co9S8 carbon catalysts (NSC/Co9S8), which have uniform mesopores or macropores. After introducing porosity into the carbon structure, electrocatalytic activity for oxygen reduction reaction was promoted, which can be attributed to the improvement of the wetting property and the interaction with O2. It was found that the NSC/Co9S8 sample with average pores size of 200 nm denoted as the best catalytic activities toward ORR and OER, and was used as air electrodes in rechargeable liquid zinc-air batteries (ZAB), which shows significantly improved ORR/OER activities and excellent durability during cycling (power density: 176 mW cm-2 and excellent stability: 120 h (360 cycles). This contribution demonstrates a common and ingenious strategy for the regulation of advanced electrocatalytic materials, thus facilitates their applications in flexible, secure energy storage and conversion devices.
      原文链接:
    • NSTL
    • Elsevier

    Solvation-protection-enabled high-voltage electrolyte for lithium metal batteries

    Su, Chi-CheungHe, MeinanCai, MeiShi, Jiayan...
    7页
    查看更多>>摘要：To facilitate the practical application of lithium metal batteries (LMBs), stable interfaces between the electrolyte and the lithium metal must be achieved. Herein, we introduce a solvation protection strategy for designing a functional electrolyte for high-voltage LMBs. Fluoroethylene carbonate (FEC) was introduced as a solvation protection solvent for the difluoroethylene carbonate (DFEC)/trifluoroethyl methyl carbonate (FEMC) electrolyte system to enable the cycling of lithium metal anode. The addition of FEC alters the structures of lithium complexes in solution because of its relatively high solvating power. Through the precise control of the solvation number (> 1) of fluorinated cyclic carbonate (i.e., FEC:DFEC > critical ratio), lithium complexes with Li+ solvated solely by FEMC, which decompose on the lithium surface to form detrimental by-products, can be effectively eliminated. The new ternary FEC/DFEC/FEMC system not only maintains the beneficial effect of DFEC in forming a robust solid-electrolyte interphase on the lithium anode, but also confers outstanding anodic stability provided by FEMC, while eliminating detrimental FEMC decomposition through the solvation protection effect of FEC. Clearly, this ternary system outperforms the FEC/FEMC and DFEC/FEMC binary systems in facilitating the stable cycling of LMBs.
      原文链接:
    • NSTL
    • Elsevier

    COFs-based electrolyte accelerates the Na+ diffusion and restrains dendrite growth in quasi-solid-state organic batteries

    Zhao, GenfuXu, LufuJiang, JingwenAn, Qi...
    11页
    查看更多>>摘要：Solid-state sodium-ion batteries exhibit a great promising opportunity for the future energy storage, and thus exploring a high-efficiency sodium-ion conductor is the urgent challenge. Covalent organic frameworks (COFs) have accurately directional and well-defined ion channels and are a promising and optimal platform for solid-state Na-ion conductor. In this work, we study the first example of carboxylic acid sodium functionalized polyarylether linked COF (denoted as NaOOC-COF) as an advanced Na-ion quasi-solid-state conductor film. Benefiting from the well-defined ion channels, the functionalized NaOOC-COF exhibits an outstanding Na+ conductivity of 2.68 x 10(-4) S cm(-1) at room temperature, low activation energy (Ea) with 0.24 eV and high transference number of 0.9. Particularly, the NaOOC-COF shows long-time cycling performance in the assembled quasi-solid-state battery, and can restrain dendrite growth through interface regulation. Furthermore, the Na+ diffusion mechanism in whole-cell system is investigated thoroughly. Such extraordinary Na-ion transport result based on COFs is achieved for the first time. This novel strategy may exploit the new area of Na-ion quasi-solid-state electrolytic devices, and simultaneously accelerate the progress of functionalized COFs.
      原文链接:
    • NSTL
    • Elsevier

    Water wave vibration-promoted solar evaporation with super high productivity

    Deng, WeiFan, TianzhuLi, Ying
    10页
    查看更多>>摘要：Interfacial solar evaporation holds great potential for water desalination; other sustainable energy resources naturally coexisting with solar energy (e.g., wind and water wave), however, have rarely been exploited to augment solar evaporation, especially in closed conditions. Herein, we developed a novel system that had an interfacial solar evaporator integrated with an angularly vibrating cantilever beam, harnessing both solar and water wave energies when floating on water surfaces for efficient water desalination. Super high evaporation rates of similar to 3.1 and 1.9 kg m(-2) h(-1) under simulated sunlight and vibrations were obtained in open and closed conditions, respectively. In outdoor tests floating on lake water surfaces, the cantilever beam effectively responded to realistic water waves of varying low frequencies and amplitudes, and the system delivered a high condensate collection rate of similar to 1.8 kg m(-2)h(-1). Mechanism studies revealed that the vibrating cantilever beam promoted vapor flow and condensation on selective surfaces. The cantilever beam enabled the direct mechanical energy transfer from water waves to moisture flow without using any electronics, resulting in great systemoperation-maintenance simplicity. This work provides new insights on advancing solar desalination with the simultaneous and rational utilization of multiple sustainable energy resources.
      原文链接:
    • NSTL
    • Elsevier

    On-wire axial perovskite heterostructures for monolithic dual-wavelength laser

    Yang, QianLi, PuYu, Kin ManLiu, Da...
    11页
    查看更多>>摘要：All-inorganic lead halide perovskites have attracted tremendous attention for their tunable bandgaps, excellent photoluminescence efficiency and robust stability. Here, we report on a direct vapor-phase growth of highquality CsPbCl3/CsPbI3 axial perovskite heterostructure and multi-heterojunction nanowires using a newly developed magnetic-pulling chemical vapor deposition approach. Microstructural characterization and optical investigations reveal that these structures are crystalline with abrupt heterojunctions. Micro-photoluminescence spectra and mapping at the heterojunctions exhibit dual-wavelength emissions at 417 nm and 698 nm, from the adjacent two disparate perovskites, respectively, further demonstrating the formation of unique heterostructures. Additionally, under a focused laser illumination, asymmetrical waveguide behavior along a single CsPbCl3/ CsPbI3 wire is clearly observed. Taking a step further, we fabricated a monolithic dual-wavelength laser using an on-wire axial perovskite heterostructure and successfully realized blue and red emissions (425.5 nm and 687.4 nm). The capability to synthesize on-wire heterostructures represents a major step toward high-integration optoelectronic circuits and nanophotonics.
      原文链接:
    • NSTL
    • Elsevier

    Bandgap engineering of lead-free ternary halide perovskites for photovoltaics and beyond: Recent progress and future prospects

    Ishaq, MuhammadShah, Usman AliChen, ShuoZheng, Zhuang-Hao...
    34页
    查看更多>>摘要：Hybrid lead-halide perovskite materials have attracted enormous attention due to their remarkable optoelectronics properties. Within just a few years of research efforts, lead-based perovskite solar cells have attained power conversion efficiencies (PCEs) comparable to that of current-state-of-the-art silicon-based counterparts. However, their further development is hindered by threatening human health owing to toxic lead and severe instability issues. To address these challenges, numerous low toxic substitutes have been reported. Among them, antimony (Sb) and bismuth (Bi) ternary halide perovskites (THPs) with a composition of A(3)M(2)X(9) are mostly focused for photovoltaic applications due to their long-term stability and high absorption coefficient. This emerging family of THPs is considered highly feasible for next-generation photovoltaics technology. However, these perovskites encounter two main issues: large bandgap and dimer phase, which are unfavorable for single junction solar cells. We take this as an incentive to review the approaches for reducing the bandgap of THPs and making them more promising for photovoltaic applications. Moreover, choosing appropriate charge transport layers could further boost the device performance. We highlighted other potential applications of THPs in various fields such as photodetectors, x-rays detection, and light emitting diode. With the perspective of their properties and recent challenges, we provide an outlook for the future development of A(3)M(2)X(9) THPs to achieve high-quality layered-phase devices for a broader range of fundamental research and their potential in single-junction or tandem solar cells.
      原文链接:
    • NSTL
    • Elsevier

    Piezo-phototronic effect promoted carrier separation in coaxial p-n junctions for self-powered photodetector

    Du, XinxinTian, WeiliangHui, BinSun, Jianhua...
    9页
    查看更多>>摘要：Sustainable and flexible photodetectors that simultaneously achieve sufficient responsivity and ultrafast speed is urgently needed to meet the booming of big data and portable electronics in our daily life. Herein, we demonstrate fiber-shaped photodetectors constructed by vertical organic-inorganic heterostructures, which achieves self-powered behavior and promoted photoresponse under series of coaxial p-n junctions and piezophototronic mechanism. Tunable photoresponse and ultrafast response and recovery (< 40 ms) are realized at zero bias by controlling bend-induced piezo-potentials of the photodetector. For the bended device with 1.96% strain, the photoresponse is enhanced 81.2% by the piezo-phototronic effect compared to the device under no strain. FEM simulation indicates that the non-uniform strain and piezo-potential distribution on the bended fiber device promotes carrier separation in the coaxial interfaces of p-n junctions, and thus improving the light detection ability. The present work provides a promising strategy for improving fiber-shaped photodetectors as well as a new idea for self-powered and ultrafast light detection in portable and wearable applications.
      原文链接:
    • NSTL
    • Elsevier

    Facet junction of BiOBr nanosheets boosting spatial charge separation for CO2 photoreduction

    Meng, JiazhiDuan, YouyuJing, ShaojieMa, Jiangping...
    9页
    查看更多>>摘要：Understanding on the photogenerated charge separation from a microscopic level remains a challenge and is highly desirable as it provides a cornerstone for designing high-performance photocatalysts. Herein, facet engineering is chosen as a tool to reveal the relationship between the charge separation/transfer and crystal structure. A series of BiOBr nanosheets with dominantly exposed facet of (001) or (010) as well as different lateral facet exposure ratios are constructed via adjusting pH value during the hydrothermal process. It is found that exposure of anisotropic crystal facets allows the separative transfer of photogenerated electrons and holes onto the lateral facets and dominantly exposed facets, respectively, which is attributed to the junction formed between distinct facets (i.e., facet junction). In the case of BiOBr-5 with (010)/(102) facet junction, the electron transfer rate (k(ET)) and efficiency (eta(ET)) are 3.658 x 10(6)s(-1) and 54.09%, which are superior than the counterpart of BiOBr-1 with (001)/(110) facet junction. The fast electron transfer rate and high transfer efficiency of BiOBr-5 result in the high CO evolution rate from CO2 photoreduction under artificial sunlight. Our work may bring some new insights into the mechanism of facet junction and rational design of photocatalysts with high performance for solar energy storage in future.
      原文链接:
    • NSTL
    • Elsevier

    Bandage based energy generators activated by sweat in wireless skin electronics for continuous physiological monitoring

    Liu, YimingHuang, XingcanZhou, JingkunLi, Jian...
    11页
    查看更多>>摘要：In the past decades, wearable electronics have attracted extensive attention for their excellent electrical performance and superior mechanical characteristics in various applications, including human machine interfaces, clinical treatment, and healthcare monitoring. Powering technology as the indispensable component for intelligent wearable electronics, have raised much concern for bulky size, low energy capacity, and rigid format. Here, we have developed an ultrathin, flexible, conformable sweat activated battery with the high power density (16.3 mW/cm2) and impressive energy capacity (74.4 mAh). Due to the advanced biocompatible materials, the battery is capable of mounting onto human skin for long-term application without any irritation risk. After optimizing the electrical characteristics, the battery@ 0.3 mm Mg layer can yield the high open-circuit voltage and short-circuit current of 1.41 V and 53.4 mA for a long time (over 3.5 hrs). Besides, the battery can stabilize its electrical performance under various mechanical deformations, such as bending, twisting at different angles, which shall lead to the practical applications as mounted onto human body. The high-performance sweat-activated batteries@ 0.1 mm Mg layer enable powering electronic devices for a long-term duration, for instance, continuously lighting 120 LEDs for over 4 hrs, and also offer enough power to support Bluetooth wireless operation for recording of physiological signals for over 1.2 hrs, allowing real-time monitoring of exercising intensity level, skin temperature, pulse rate, and oxygen saturation in blood.
      原文链接:
    • NSTL
    • Elsevier

    Transient physical modeling and comprehensive optimal design of air-breakdown direct-current triboelectric nanogenerators

    Wang, JieYou, ZhengZhang, HeWang, Zhong Lin...
    12页
    查看更多>>摘要：Direct-Current Triboelectric Nanogenerators (DC-TENGs) achieves an direct-current (DC) output instead of traditional alternating-current (AC) output of TENG. Among the various structure designs of DC-TENGs, the airbreakdown DC-TENG has created a record of energy density and an almost constant-current output, which has great potential in practical applications. This paper proposes a transient physical-field model and carries out comprehensive optimal design for air-breakdown DC-TENG. The beneficial breakdown domain (BBD) and harmful breakdown domain (HBD) are introduced to reveal the dynamic mechanism that distinguishes the DCTENGs from AC-TENGs. Indexes of the breakdown charge ratio (BCR) and leading charge density (LCD) are defined to evaluate the extent to which the high-density surface charge is effectively exploited in electricity generation based on the beneficial breakdown effect. The output characteristics of air-breakdown DC-TENGs are theoretically analyzed, revealing the influence of the load resistance, device structure parameters, and initial charge density. Therefore, the optimal design of air-breakdown DC-TENGs is carried out with a high output power and low matching resistance. Finally, these superior performances are verified by experiments, so that the proposed transient physical model and comprehensive optimization method can be reliably extended to the design of all types of air-breakdown DC-TENG, and promote its application in a wide range of fields.
      原文链接:
    • NSTL
    • Elsevier