Journal of Energy Chemistry最新文献_第3页

Magnetically-responsive phase change thermal storage materials: Mechanisms, advances, and beyond 磁响应相变蓄热材料：机理、进展及其他

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.09.055

Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials (PCMs). Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems, enabling PCMs to perform unprecedented functions (such as green energy utilization, magnetic thermotherapy, drug release, etc.). The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite PCMs. However, a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still missing. Herein, we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite PCMs. We delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions, meticulously scrutinizing the intricate interplay between their architectures and thermophysical attributes. Moreover, we prognosticate future research trajectories, delineate alternative stratagems, and illuminate prospective avenues. This review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.

热管理技术的飞速发展和多能源转换需求的不断增加，对下一代形状稳定的复合相变材料（PCM）提出了严格的能效要求。磁响应相变储热材料被认为是储能系统的新兴概念，可使 PCMs 发挥前所未有的功能（如绿色能源利用、磁热疗法、药物释放等）。多功能磁性纳米材料与 PCM 的结合是创造先进多功能复合 PCM 的里程碑。然而，关于基于磁性纳米粒子改性的复合 PCM 的及时而全面的综述仍然缺失。在此，我们将详尽阐述磁响应复合 PCM 的前沿进展。我们深入探讨了不同纳米粒子在不同尺寸的复合 PCM 中扮演的各种角色，仔细研究了它们的结构和热物理属性之间错综复杂的相互作用。此外，我们还预测了未来的研究轨迹，勾勒了替代策略，并阐明了前瞻性的研究途径。本综述旨在激发跨学科领域更广泛的学术兴趣，并为下一代磁响应复合 PCM 的开发提供有价值的见解。

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引用次数: 0

Hybrid conductive-lithophilic-fluoride triple protection interface engineering: Dendrite-free reverse lithium deposition for high-performance lithium metal batteries 混合导电-嗜石-氟化物三重保护界面工程：用于高性能锂金属电池的无枝晶反向锂沉积技术

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.10.002

Lithium metal batteries (LMBs) with high energy density are impeded by the instability of solid electrolyte interface (SEI) and the uncontrolled growth of lithium (Li) dendrite. To mitigate these challenges, optimizing the SEI structure and Li deposition behavior is the key to stable LMBs. This study novelty proposes a facile synthesis of MgF₂/carbon (C) nanocomposite through the mechanochemical reaction between metallic Mg and polytetrafluoroethylene (PTFE) powders, and its modified polypropylene (PP) separator enhances LMB performance. The in-situ formed highly conductive fluorine-doped C species play a crucial role in facilitating ion/electron transport, thereby accelerating electrochemical kinetics and altering Li deposition direction. During cycling, the in-situ reaction between MgF₂ and Li leads to the formation of LiMg alloy, along with a LiF-rich SEI layer, which reduces the nucleation overpotential and reinforces the interphase strength, leading to homogeneous Li deposition with dendrite-free feature. Benefiting from these merits, the Li metal is densely and uniformly deposited on the MgF₂/C@PP separator side rather than on the current collector side. Furthermore, the symmetric cell with MgF₂/C@PP exhibits superb Li plating/stripping performance over 2800 h at 1 mA cm⁻² and 2 mA h cm⁻². More importantly, the assembled Li@MgF₂/C@PP|LiFePO₄ full cell with a low negative/positive ratio of 3.6 delivers an impressive cyclability with 82.7% capacity retention over 1400 cycles at 1 C.

固态电解质界面（SEI）的不稳定性和锂（Li）枝晶的不可控生长阻碍了高能量密度的锂金属电池（LMB）的发展。为了缓解这些挑战，优化 SEI 结构和锂沉积行为是获得稳定 LMB 的关键。本研究通过金属镁和聚四氟乙烯（PTFE）粉末之间的机械化学反应，新颖地提出了一种简便的 MgF2/carbon (C) 纳米复合材料的合成方法，其改性聚丙烯（PP）隔膜提高了 LMB 的性能。原位形成的高导电性掺氟 C 物种在促进离子/电子传输方面发挥了关键作用，从而加速了电化学动力学并改变了锂沉积方向。在循环过程中，MgF2 和锂之间的原位反应会形成锂镁合金以及富含 LiF 的 SEI 层，从而降低了成核过电位并增强了相间强度，导致锂沉积均匀且无枝晶。得益于这些优点，锂金属密集而均匀地沉积在 MgF2/C@PP 分离器一侧，而不是集流器一侧。此外，带有 MgF2/C@PP 的对称电池在 1 mA cm-2 和 2 mA h cm-2 下的 2800 小时内表现出卓越的锂镀层/剥离性能。更重要的是，组装好的 Li@MgF2/C@PP|LiFePO4 全电池的负极/正极比低至 3.6，在 1 C 温度下循环 1400 次，容量保持率达到 82.7%，循环性能令人印象深刻。

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引用次数: 0

Reversible Li plating regulation on graphite anode through a barium sulfate nanofibers-based dielectric separator for fast charging and high-safety lithium-ion battery 通过基于硫酸钡纳米纤维的电介质隔膜对石墨负极进行可逆锂电镀调节，实现快速充电和高安全性锂离子电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.08.053

Poor Li plating reversibility and high thermal runaway risks are key challenges for fast charging lithium-ion batteries with graphite anodes. Herein, a dielectric and fire-resistant separator based on hybrid nanofibers of barium sulfate (BS) and bacterial cellulose (BC) is developed to synchronously enhance the battery’s fast charging and thermal-safety performances. The regulation mechanism of the dielectric BS/BC separator in enhancing the Li⁺ ion transport and Li plating reversibility is revealed. (1) The Max-Wagner polarization electric field of the dielectric BS/BC separator can accelerate the desolvation of solvated Li⁺ ions, enhancing their transport kinetics. (2) Moreover, due to the charge balancing effect, the dielectric BS/BC separator homogenizes the electric field/Li⁺ ion flux at the graphite anode-separator interface, facilitating uniform Li plating and suppressing Li dendrite growth. Consequently, the fast-charge graphite anode with the BS/BC separator shows higher Coulombic efficiency (99.0% vs. 96.9%) and longer cycling lifespan (100 cycles vs. 59 cycles) than that with the polypropylene (PP) separator in the constant-lithiation cycling test at 2 mA cm⁻². The high-loading LiFePO₄ (15.5 mg cm⁻²)//graphite (7.5 mg cm⁻²) full cell with the BS/BC separator exhibits excellent fast charging performance, retaining 70% of its capacity after 500 cycles at a high rate of 2C, which is significantly better than that of the cell with the PP separator (retaining only 27% of its capacity after 500 cycles). More importantly, the thermally stable BS/BC separator effectively elevates the critical temperature and reduces the heat release rate during thermal runaway, thereby significantly enhancing the battery’s safety.

镀锂可逆性差和热失控风险高是石墨负极快速充电锂离子电池面临的主要挑战。本文开发了一种基于硫酸钡（BS）和细菌纤维素（BC）混合纳米纤维的电介质耐火隔膜，以同步提高电池的快速充电性能和热安全性能。揭示了 BS/BC 介电隔膜在增强锂离子传输和锂电镀可逆性方面的调节机制。(1）电介质 BS/BC 隔离层的 Max-Wagner 极化电场可加速溶解的 Li+ 离子的解溶解，增强其传输动力学。(2) 此外，由于电荷平衡效应，电介质 BS/BC 分离器可使石墨阳极-分离器界面上的电场/Li+ 离子通量均匀化，从而促进锂的均匀电镀并抑制锂枝晶的生长。因此，在 2 mA cm-2 的恒定锂化循环测试中，使用 BS/BC 隔离层的快充石墨阳极比使用聚丙烯（PP）隔离层的阳极具有更高的库仑效率（99.0% 对 96.9%）和更长的循环寿命（100 次对 59 次）。使用 BS/BC 隔膜的高负载磷酸铁锂（15.5 毫克/厘米-2）/石墨（7.5 毫克/厘米-2）全电池具有出色的快速充电性能，在 2C 的高倍率下循环 500 次后仍能保持 70% 的容量，明显优于使用 PP 隔膜的电池（循环 500 次后仅能保持 27% 的容量）。更重要的是，热稳定的 BS/BC 隔膜有效地提高了临界温度，降低了热失控时的热释放率，从而大大提高了电池的安全性。

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引用次数: 0

Enhanced battery life prediction with reduced data demand via semi-supervised representation learning 通过半监督表征学习减少数据需求，提高电池寿命预测能力

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-16 DOI: 10.1016/j.jechem.2024.10.001

Accurate prediction of the remaining useful life (RUL) is crucial for the design and management of lithium-ion batteries. Although various machine learning models offer promising predictions, one critical but often overlooked challenge is their demand for considerable run-to-failure data for training. Collection of such training data leads to prohibitive testing efforts as the run-to-failure tests can last for years. Here, we propose a semi-supervised representation learning method to enhance prediction accuracy by learning from data without RUL labels. Our approach builds on a sophisticated deep neural network that comprises an encoder and three decoder heads to extract time-dependent representation features from short-term battery operating data regardless of the existence of RUL labels. The approach is validated using three datasets collected from 34 batteries operating under various conditions, encompassing over 19,900 charge and discharge cycles. Our method achieves a root mean squared error (RMSE) within 25 cycles, even when only 1/50 of the training dataset is labelled, representing a reduction of 48% compared to the conventional approach. We also demonstrate the method’s robustness with varying numbers of labelled data and different weights assigned to the three decoder heads. The projection of extracted features in low space reveals that our method effectively learns degradation features from unlabelled data. Our approach highlights the promise of utilising semi-supervised learning to reduce the data demand for reliability monitoring of energy devices.

准确预测剩余使用寿命（RUL）对于锂离子电池的设计和管理至关重要。虽然各种机器学习模型都能提供有前景的预测，但一个关键但经常被忽视的挑战是，这些模型需要大量的运行至失效数据进行训练。收集这些训练数据会导致测试工作令人望而却步，因为从运行到失效的测试可能会持续数年之久。在此，我们提出了一种半监督表示学习方法，通过从无 RUL 标签的数据中学习来提高预测准确性。我们的方法基于复杂的深度神经网络，该网络由一个编码器和三个解码头组成，可从短期电池运行数据中提取随时间变化的表征特征，而无需考虑是否存在 RUL 标签。我们使用从 34 个在不同条件下工作的电池中收集的三个数据集对该方法进行了验证，这些数据集包含超过 19,900 个充放电周期。即使只有 1/50 的训练数据集被标记，我们的方法也能在 25 个周期内实现均方根误差 (RMSE)，与传统方法相比减少了 48%。我们还展示了该方法在使用不同数量的标记数据和分配给三个解码器头的不同权重时的鲁棒性。低空间提取特征的投影显示，我们的方法能有效地从未标明的数据中学习退化特征。我们的方法凸显了利用半监督学习减少能源设备可靠性监测数据需求的前景。

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引用次数: 0

Bioinspired smart dual-layer hydrogels system with synchronous solar and thermal radiation modulation for energy-saving all-season temperature regulation 具有太阳能和热辐射同步调制功能的生物启发智能双层水凝胶系统，可实现节能型四季温度调节

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-11 DOI: 10.1016/j.jechem.2024.09.051

All-season thermal management with zero energy consumption and emissions is more crucial to global decarbonization over traditional energy-intensive cooling/heating systems. However, the static single thermal management for cooling or heating fails to self-regulate the temperature in dynamic seasonal temperature condition. Herein, inspired by the dual-temperature regulation function of the fur color changes on the backs and abdomens of penguins, a smart thermal management composite hydrogel (PNA@H-PM Gel) system was subtly created though an “on-demand” dual-layer structure design strategy. The PNA@H-PM Gel system features synchronous solar and thermal radiation modulation as well as tunable phase transition temperatures to meet the variable seasonal thermal requirements and energy-saving demands via self-adaptive radiative cooling and solar heating regulation. Furthermore, this system demonstrates superb modulations of both the solar reflectance (ΔR = 0.74) and thermal emissivity (ΔE = 0.52) in response to ambient temperature changes, highlighting efficient temperature regulation with average radiative cooling and solar heating effects of 9.6 °C in summer and 6.1 °C in winter, respectively. Moreover, compared to standard building baselines, the PNA@H-PM Gel presents a more substantial energy-saving cooling/heating potentials for energy-efficient buildings across various regions and climates. This novel solution, inspired by penguins in the real world, will offer a fresh approach for producing intelligent, energy-saving thermal management materials, and serve for temperature regulation under dynamic climate conditions and even throughout all seasons.

与传统的高能耗制冷/制热系统相比，零能耗和零排放的四季热管理对全球去碳化更为重要。然而，静态的单一制冷或制热热管理无法在动态的季节性温度条件下实现温度的自我调节。在此，受企鹅背部和腹部毛色变化的双重温度调节功能启发，通过 "按需 "双层结构设计策略，巧妙地创建了一种智能热管理复合水凝胶（PNA@H-PM Gel）系统。PNA@H-PM 凝胶系统具有同步太阳辐射和热辐射调制以及可调相变温度的特点，可通过自适应辐射冷却和太阳加热调节来满足不同季节的热需求和节能要求。此外，该系统还能根据环境温度的变化对太阳反射率（ΔR = 0.74）和热辐射率（ΔE = 0.52）进行出色的调节，从而实现高效的温度调节，其夏季平均辐射制冷和冬季平均辐射供暖效果分别为 9.6 °C和 6.1 °C。此外，与标准建筑基线相比，PNA@H-PM 凝胶为不同地区和气候条件下的节能建筑提供了更大的节能制冷/制热潜力。这种从现实世界中的企鹅获得灵感的新型解决方案将为生产智能节能热管理材料提供一种全新的方法，并可用于动态气候条件下的温度调节，甚至四季皆宜。

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引用次数: 0

A review of over-discharge protection through prelithiation in working lithium-ion batteries 工作锂离子电池中通过预锂化实现过放电保护的综述

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-10 DOI: 10.1016/j.jechem.2024.09.050

The demand for high safety and high reliability lithium-ion batteries (LIBs) is strongly considered for practical applications. However, due to their inherent self-discharge properties or abuse, LIBs face the threat of over-discharge, which induces premature end of life and increased risk of thermal runaway. In addition, a strong demand for batteries with zero-volt storage is strongly considered for aerospace and implantable medical devices. In this review, we firstly introduce the necessity and the importance of over-discharge and zero-volt protection for LIBs. The mechanism of damage to the Cu current collectors and SEI induced by potential changes during over-discharge is presented. The current over-discharge protection strategies based on whether the zero-crossing potential of the electrodes is summarized. Finally, the fresh insights into the material design of cathode prelithiation additives are presented from the perspective of over-discharge protection.

在实际应用中，对高安全性和高可靠性锂离子电池（LIBs）的需求日益强烈。然而，由于其固有的自放电特性或滥用，锂离子电池面临着过放电的威胁，这会导致电池过早报废，并增加热失控的风险。此外，航空航天和植入式医疗设备对零伏特存储电池的需求也非常强烈。在本综述中，我们首先介绍了锂离子电池过放电和零伏保护的必要性和重要性。介绍了过放电过程中电位变化对铜集流器和 SEI 造成损害的机理。总结了当前基于电极过零电位的过放电保护策略。最后，从过放电保护的角度介绍了阴极预锂化添加剂材料设计的新见解。

引用次数: 0

Exploring catalyst developments in heterogeneous CO2 hydrogenation to methanol and ethanol: A journey through reaction pathways 探索异相二氧化碳加氢制甲醇和乙醇的催化剂发展：反应路径之旅

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-10 DOI: 10.1016/j.jechem.2024.08.069

The pursuit of alternative fuel generation technologies has gained momentum due to the diminishing reserves of fossil fuels and global warming from increased CO₂ emission. Among the proposed methods, the hydrogenation of CO₂ to produce marketable carbon-based products like methanol and ethanol is a practical approach that offers great potential to reduce CO₂ emissions. Although significant volumes of methanol are currently produced from CO₂, developing highly efficient and stable catalysts is crucial for further enhancing conversion and selectivity, thereby reducing process costs. An in-depth examination of the differences and similarities in the reaction pathways for methanol and ethanol production highlights the key factors that drive C–C coupling. Identifying these factors guides us toward developing more effective catalysts for ethanol synthesis. In this paper, we explore how different catalysts, through the production of various intermediates, can initiate the synthesis of methanol or ethanol. The catalytic mechanisms proposed by spectroscopic techniques and theoretical calculations, including operando X-ray methods, FTIR analysis, and DFT calculations, are summarized and presented. The following discussion explores the structural properties and composition of catalysts that influence C–C coupling and optimize the conversion rate of CO₂ into ethanol. Lastly, the review examines recent catalysts employed for selective methanol and ethanol production, focusing on single-atom catalysts.

由于化石燃料储量的不断减少以及二氧化碳排放量的增加导致全球变暖，人们对替代燃料生成技术的追求日益高涨。在提出的各种方法中，利用二氧化碳加氢生产甲醇和乙醇等适销对路的碳基产品是一种实用的方法，具有减少二氧化碳排放的巨大潜力。虽然目前已利用二氧化碳生产了大量甲醇，但开发高效稳定的催化剂对于进一步提高转化率和选择性，从而降低工艺成本至关重要。通过深入研究甲醇和乙醇生产反应途径的异同，可以发现推动 C-C 偶联的关键因素。找出这些因素有助于我们开发更有效的乙醇合成催化剂。在本文中，我们探讨了不同催化剂如何通过产生各种中间产物来启动甲醇或乙醇的合成。本文总结并介绍了通过光谱技术和理论计算（包括操作X射线方法、傅立叶变换红外分析和DFT计算）提出的催化机理。接下来的讨论探讨了影响 C-C 偶联和优化二氧化碳转化为乙醇的转化率的催化剂结构特性和组成。最后，本综述探讨了最近用于选择性甲醇和乙醇生产的催化剂，重点是单原子催化剂。

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引用次数: 0

Understanding the iodine electrochemical behaviors in aqueous zinc batteries 了解锌水电池中的碘电化学行为

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-05 DOI: 10.1016/j.jechem.2024.09.049

Iodine is widely used in aqueous zinc batteries (ZBs) due to its abundant resources, low cost, and active redox reactions. In addition to the active material in zinc-iodine batteries, iodine also plays an important role in other ZBs, such as regulating the electrochemical behavior of zinc ions, promoting the reaction kinetic and reversibility of other redox pairs, catalytic behaviors related to iodine reactions, coupling with other halogen ions, shuttle behaviors of polyiodides, etc. However, there is currently a lack of comprehensive discussion on these aspects. Here, this review provides a comprehensive overview of the electrochemical behaviors of iodide in the aqueous ZBs. The effect of iodine ions on the Zn²⁺ desolvation behaviors and the interfacial behaviors of Zn anode was summarized. Iodine redox pairs boosting other redox pairs, such as MnO₂/Mn²⁺ redox pair and vanadium redox pair to obtain high reversibility and capacity was also discussed. Moreover, the catalytic behaviors related to iodine reactions in aqueous ZBs, synergistic reaction with other halogen ions and suppression of shuttle behaviors for high performance zinc-iodine batteries were systematically analyzed. Finally, future prospects for designing effective iodine electrochemical behaviors with practicability are proposed, which will provide scientific guidance for the practical application of iodine-related aqueous ZBs.

碘因其资源丰富、成本低廉、氧化还原反应活跃而被广泛应用于水性锌电池（ZBs）中。除了作为锌碘电池的活性材料，碘在其他锌电池中也发挥着重要作用，如调节锌离子的电化学行为、促进其他氧化还原对的反应动力学和可逆性、与碘反应有关的催化行为、与其他卤素离子的偶联、聚碘化物的穿梭行为等。然而，目前还缺乏对这些方面的全面讨论。在此，本综述全面概述了碘化物在水性 ZBs 中的电化学行为。总结了碘离子对 Zn2+ 脱溶行为和 Zn 阳极界面行为的影响。还讨论了碘氧化还原对促进其他氧化还原对（如 MnO2/Mn2+ 氧化还原对和钒氧化还原对）以获得高可逆性和高容量的问题。此外，还系统分析了水性锌碘电池中与碘反应有关的催化行为、与其他卤素离子的协同反应以及抑制高性能锌碘电池的穿梭行为。最后，对设计具有实用性的有效碘电化学行为提出了展望，这将为碘相关水性锌碘电池的实际应用提供科学指导。

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引用次数: 0

A seaweed-inspired separator for high performance Zn metal batteries: Boosting kinetics and confining side-reactions 用于高性能锌金属电池的海藻启发式隔膜：促进动力学和限制副反应

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-04 DOI: 10.1016/j.jechem.2024.09.047

Uncontrolled dendrite growth, sluggish reaction kinetics, and drastic side reactions on the anode-electrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion batteries. Traditional glass fiber (GF) separator with chemical inertness is almost ineffective in restricting these challenges. Herein, inspired by the ionic enrichment behavior of seaweed plants, a facile biomass species, anionic sodium alginate (SA), is purposely decorated on the commercial GF separator to tackle these issues towards Zn anode. Benefiting from the abundant zincophilic functional groups and superior mechanical strength properties, the as-obtained SA@GF separator could act as ion pump to boost the Zn²⁺ transference number (0.68), reduce the de-solvation energy barrier of hydrated Zn²⁺, and eliminate the undesired concentration polarization effect, which are verified by experimental tests, theoretical calculations, and finite element simulation, respectively. Based on these efficient modulation mechanisms, the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic side-reactions. Therefore, the Zn||Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h (1 mA cm⁻² and 1 mAh cm⁻²), exhibiting favorable competitiveness with previously reported separator modification strategies. Impressively, the Zn-MnO₂ full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance, further verifying its practical application effect. This work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.

阳极-电解质界面不受控制的枝晶生长、缓慢的反应动力学和剧烈的副反应是限制锌离子水电池应用前景的主要障碍。具有化学惰性的传统玻璃纤维（GF）隔膜几乎无法有效限制这些挑战。本文受海藻植物离子富集行为的启发，特意在商用玻璃纤维隔膜上装饰了一种简便的生物质物种--阴离子海藻酸钠（SA），以解决锌阳极的这些问题。得益于丰富的亲锌官能团和优越的机械强度特性，所获得的 SA@GF 分离器可作为离子泵提高 Zn2+ 迁移数（0.68），降低水合 Zn2+ 的脱溶能障，并消除不希望出现的浓度极化效应，这些都分别通过实验测试、理论计算和有限元模拟得到了验证。基于这些高效的调制机制，SA@GF 分离器可以同步实现锌的均匀沉积和抑制寄生副反应。因此，集成了 SA@GF 分离器的 Zn||Zn 纽扣电池可延长日历寿命超过 1230 h（1 mA cm-2 和 1 mAh cm-2），与之前报道的分离器改性策略相比，表现出良好的竞争力。令人印象深刻的是，与 SA@GF 分离器组装在一起的 Zn-MnO2 全电池和袋式电池还具有优异的循环稳定性和速率性能，进一步验证了其实际应用效果。这项工作从分离器方面为稳定锌阳极提供了一种新的设计理念。

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引用次数: 0

MOF-derived Ni3Fe/Ni/NiFe2O4@C for enhanced hydrogen storage performance of MgH2 MOF 衍生的 Ni3Fe/Ni/NiFe2O4@C，用于提高 MgH2 的储氢性能

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-04 DOI: 10.1016/j.jechem.2024.09.048

Magnesium hydride (MgH₂) is an important material for hydrogen (H₂) storage and transportation owing to its high capacity and reversibility. However, its intrinsic properties have considerably limited its industrial application. In this study, the NiFe-800 catalyst as metal-organic framework (MOF) derivative was first utilized to promote the intrinsic properties of MgH₂. Compared to pure MgH₂, which releases 1.24 wt% H₂ in 60 min at 275 °C, the MgH₂-10 NiFe-800 composite releases 5.85 wt% H₂ in the same time. Even at a lower temperature of 250 °C, the MgH₂-10 NiFe-800 composite releases 3.57 wt% H₂, surpassing the performance of pure MgH₂ at 275 °C. Correspondingly, while pure MgH₂ absorbs 2.08 wt% H₂ in 60 min at 125 °C, the MgH₂-10 NiFe-800 composite absorbs 5.35 wt% H₂ in just 1 min. Remarkably, the MgH₂-10 NiFe-800 composite absorbs 2.27 wt% H₂ in 60 min at 50 °C and 4.64 wt% H₂ at 75 °C. This indicates that MgH₂-10 NiFe-800 exhibits optimum performance with excellent kinetics at low temperatures. Furthermore, the capacity of the MgH₂-10 NiFe-800 composite remains largely stable after 10 cycles. Moreover, the Mg₂Ni/Mg₂NiH₄ acts as a “hydrogen pump”, providing effective diffusion channels that enhance the kinetic process of the composite during cycling. Additionally, Fe⁰ facilitates electron transfer and creates hydrogen diffusion channels and catalytic sites. Finally, carbon (C) effectively prevents particle agglomeration and maintains the cyclic stability of the composites. Consequently, the synergistic effects of Mg₂Ni/Mg₂NiH₄, Fe⁰, and C considerably improve the kinetic properties and cycling stability of MgH₂. This work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH₂.

氢化镁（MgH2）具有高容量和可逆性，是一种重要的氢气（H2）储存和运输材料。然而，其固有特性在很大程度上限制了其工业应用。在本研究中，首先利用 NiFe-800 催化剂作为金属有机框架 (MOF) 衍生物来促进 MgH2 的内在特性。与纯 MgH2 在 275 °C 下 60 分钟内释放 1.24 wt% H2 相比，MgH2-10 NiFe-800 复合材料在相同时间内释放 5.85 wt% H2。即使在 250 °C 的较低温度下，MgH2-10 NiFe-800 复合材料也能释放出 3.57 wt% 的 H2，超过了纯 MgH2 在 275 °C 下的性能。相应地，纯 MgH2 在 125 °C 下 60 分钟内吸收了 2.08 wt% 的 H2，而 MgH2-10 NiFe-800 复合材料仅在 1 分钟内就吸收了 5.35 wt% 的 H2。值得注意的是，MgH2-10 NiFe-800 复合材料在 50 °C 下 60 分钟内吸收 2.27 wt% H2，在 75 °C 下吸收 4.64 wt% H2。这表明，MgH2-10 NiFe-800 在低温条件下表现出最佳性能和出色的动力学特性。此外，MgH2-10 NiFe-800 复合材料的容量在 10 次循环后基本保持稳定。此外，Mg2Ni/Mg2NiH4 起到了 "氢泵 "的作用，提供了有效的扩散通道，增强了复合材料在循环过程中的动力学过程。此外，Fe0 可促进电子转移，并创建氢扩散通道和催化位点。最后，碳（C）可有效防止颗粒团聚，保持复合材料的循环稳定性。因此，Mg2Ni/Mg2NiH4、Fe0 和 C 的协同作用大大改善了 MgH2 的动力学特性和循环稳定性。这项工作为提高 MgH2 商业应用中的储氢效率提供了一种有效而有价值的方法。

{"title":"MOF-derived Ni3Fe/Ni/NiFe2O4@C for enhanced hydrogen storage performance of MgH2","authors":"","doi":"10.1016/j.jechem.2024.09.048","DOIUrl":"10.1016/j.jechem.2024.09.048","url":null,"abstract":"<div><div>Magnesium hydride (MgH<sub>2</sub>) is an important material for hydrogen (H<sub>2</sub>) storage and transportation owing to its high capacity and reversibility. However, its intrinsic properties have considerably limited its industrial application. In this study, the NiFe-800 catalyst as metal-organic framework (MOF) derivative was first utilized to promote the intrinsic properties of MgH<sub>2</sub>. Compared to pure MgH<sub>2</sub>, which releases 1.24 wt% H<sub>2</sub> in 60 min at 275 °C, the MgH<sub>2</sub>-10 NiFe-800 composite releases 5.85 wt% H<sub>2</sub> in the same time. Even at a lower temperature of 250 °C, the MgH<sub>2</sub>-10 NiFe-800 composite releases 3.57 wt% H<sub>2</sub>, surpassing the performance of pure MgH<sub>2</sub> at 275 °C. Correspondingly, while pure MgH<sub>2</sub> absorbs 2.08 wt% H<sub>2</sub> in 60 min at 125 °C, the MgH<sub>2</sub>-10 NiFe-800 composite absorbs 5.35 wt% H<sub>2</sub> in just 1 min. Remarkably, the MgH<sub>2</sub>-10 NiFe-800 composite absorbs 2.27 wt% H<sub>2</sub> in 60 min at 50 °C and 4.64 wt% H<sub>2</sub> at 75 °C. This indicates that MgH<sub>2</sub>-10 NiFe-800 exhibits optimum performance with excellent kinetics at low temperatures. Furthermore, the capacity of the MgH<sub>2</sub>-10 NiFe-800 composite remains largely stable after 10 cycles. Moreover, the Mg<sub>2</sub>Ni/Mg<sub>2</sub>NiH<sub>4</sub> acts as a “hydrogen pump”, providing effective diffusion channels that enhance the kinetic process of the composite during cycling. Additionally, Fe<sup>0</sup> facilitates electron transfer and creates hydrogen diffusion channels and catalytic sites. Finally, carbon (C) effectively prevents particle agglomeration and maintains the cyclic stability of the composites. Consequently, the synergistic effects of Mg<sub>2</sub>Ni/Mg<sub>2</sub>NiH<sub>4</sub>, Fe<sup>0</sup>, and C considerably improve the kinetic properties and cycling stability of MgH<sub>2</sub>. This work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH<sub>2</sub>.</div></div>","PeriodicalId":15728,"journal":{"name":"Journal of Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":13.1,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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