Journal of Energy Chemistry最新文献_第5页

Towards circular batteries: A water-soluble, recyclable, self-healing binder for aqueous-processed sulfur cathodes 迈向循环电池：一种水溶性、可回收、自愈的粘合剂，用于水处理的硫阴极

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-02-03 DOI: 10.1016/j.jechem.2026.01.030

Yuchuan Ren , Qian Xue , Liqiang Lu , Canhuang Li , Guanjie Li , Nikolay Kardjilov , Ingo Manke , Jiaqi Zhao , Xuan Lu , Jing Yu , Guifang Zeng , Xiaoyu Bi , Shengnan Zhang , Armando Berlanga-Vázquez , Chen Huang , Xuede Qi , Xueqiang Qi , Jordi Arbiol , Yan Lu , Guoqiang Tan , Andreu Cabot

Sulfur cathodes have attracted considerable attention due to their potential for high energy density and cost-effectiveness. However, their limited stability, in part stemming from volume changes during cycling and the dissolution and migration of metal polysulfides, has hindered their commercialization. Binders play a critical role in preventing electrode delamination, while potentially contributing additional functionalities, such as trapping polysulfides. In this work, we introduce an aqueous-processable sulfur cathode binder composed of polyvinyl alcohol (PVA) and polyethylene glycol (PEG). Multiple hydrogen bonding interactions provided by the PVA/PEG binder hydrogen-bond network enhance metal-ion diffusion and trap polysulfides, thereby reducing their dissolution. Additionally, microcracks generated during the cycling can be healed by the dynamic hydrogen-bond network. Thereby, in lithium-sulfur cells, PVA/PEG-based cathodes exhibit an ultralow per-cycle capacity fade of 0.0023% over 600 cycles at 1C, and deliver up to 677 mAh/g in lean-electrolyte pouch cells (E/S = 4 µL/mg), retaining 99% of the initial capacity after 100 cycles at 0.1C in pouch cell. Theoretical calculations and molecular dynamics simulations confirm the superior adsorption energy and repairability of the PVA/PEG binder, reinforcing its ability to stabilize the cathode. Additionally, PVA/PEG-based cathodes exhibit excellent flame retardancy, support eco-friendly and closed-loop recycling due to the binder’s water solubility, which allows for easy electrode material reutilization.

硫阴极由于其高能量密度和成本效益的潜力而引起了人们的广泛关注。然而，它们有限的稳定性，部分源于循环过程中的体积变化和金属多硫化物的溶解和迁移，阻碍了它们的商业化。粘合剂在防止电极分层方面起着至关重要的作用，同时还具有潜在的附加功能，例如捕获多硫化物。本文介绍了一种由聚乙烯醇（PVA）和聚乙二醇（PEG）组成的可水加工硫阴极粘结剂。PVA/PEG粘结剂氢键网络提供的多重氢键相互作用增强了金属离子的扩散并捕获了多硫化物，从而减少了它们的溶解。此外，循环过程中产生的微裂纹可以通过动态氢键网络修复。因此，在锂硫电池中，PVA/ peg基阴极在1C下的600次循环中表现出0.0023%的超低每循环容量衰减，并且在稀薄电解质袋状电池（E/S = 4 μ L/mg）中提供高达677 mAh/g的容量，在0.1C的袋状电池中进行100次循环后保持99%的初始容量。理论计算和分子动力学模拟证实了PVA/PEG粘合剂优越的吸附能和可修复性，增强了其稳定阴极的能力。此外，PVA/ peg基阴极具有优异的阻燃性，由于粘合剂的水溶性，支持环保和闭环回收，这使得电极材料易于再利用。

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引用次数: 0

A reactor design approach to address the high-loading paradox in high-energy-density flow batteries 解决高能量密度液流电池高负荷悖论的反应器设计方法

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.jechem.2026.01.020

Xinyue Liu, Yuwei Chen, Weicheng Wu, Zijian Guan, Jiankang Yang, Yunxuan Li, Mingyue Zhou, Xingying Lan

Redox targeting-based flow batteries (RTFBs), which integrate high-capacity solid materials, hold immense promise for breaking the energy density ceiling of conventional flow batteries. However, this promise has been severely hindered by a persistent “high-loading paradox,” where increasing the solid material loading paradoxically diminishes its utilization, preventing meaningful performance gains. Here, we overturn the long-standing assumption that this is an intrinsic material limitation. We demonstrate that the paradox is, in fact, a solvable macroscopic transport problem. By introducing a rational, hydrodynamics-driven reactor engineering paradigm, we successfully shatter this performance barrier. Our optimized architecture eradicates flow stagnation zones, enabling uniform solid–liquid contact and unlocking the full potential of the active material. This strategy achieved an unprecedented simultaneous high solid loading of 0.88 kg L⁻¹ and an outstanding utilization of 83%, resolving the paradox. Consequently, a Zn-PB hybrid flow battery delivered a record-high energy density of 111.6 Wh L⁻¹. This work demonstrates macro-scale reactor engineering as a powerful and previously overlooked design dimension for the [Fe(CN)₆]³⁻-PB electrolyte system, offering a new approach for redox-targeting systems to unlock the true performance of solid-state materials in next-generation, high-energy-density flow batteries.

基于氧化还原靶的液流电池（RTFBs）集成了高容量固体材料，有望突破传统液流电池的能量密度上限。然而，这一前景受到了持续存在的“高负载悖论”的严重阻碍，即增加固体材料负载反而会减少其利用率，从而阻碍了有意义的性能提升。在这里，我们推翻了长期以来的假设，即这是一种内在的物质限制。我们证明了这个悖论实际上是一个可解的宏观输运问题。通过引入一种合理的、流体动力学驱动的反应堆工程范式，我们成功地打破了这一性能障碍。我们优化的结构消除了流动停滞区，实现了均匀的固液接触，释放了活性材料的全部潜力。该策略同时实现了前所未有的高固体载荷0.88 kg L−1和83%的出色利用率，解决了这一矛盾。因此，锌- pb混合液流电池的能量密度达到了创纪录的111.6 Wh L−1。这项工作证明了宏观反应器工程是[Fe(CN)6]3−-PB电解质系统的一个强大的、以前被忽视的设计维度，为氧化还原靶向系统提供了一种新的方法，以解锁下一代高能量密度液流电池中固态材料的真实性能。

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引用次数: 0

Synergy of interfacial Co–S bonds and metal bond-connected Cu–Co dual sites for boosting photocatalytic CO2 reduction into ethylene 界面Co-S键和金属键连接的Cu-Co双位点协同作用促进光催化CO2还原成乙烯

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-12 DOI: 10.1016/j.jechem.2026.01.003

Qingling Huang , Jie Lin , Jianqiang Hu , Yi Luo , Yicheng Yang , Guobing Zhou , Zhen Yang , Yong Zhou

Photocatalytic CO₂ reduction into valuable C₂₊ products remains a significant challenge, primarily due to inefficient electron transfer and utilization, along with sluggish kinetics in C–C coupling. Herein, we designed and fabricated CoS/CuCo₂S₄ (CS/CCS) hollow-nanosphere heterostructured photocatalysts bridged by interfacial Co–S bonds and containing rich S vacancies (V_S). The interfacial Co–S bonds act as atomic-level channels, facilitating the separation and transfer of photoinduced carriers and concentrating photogenerated electrons mainly on CuCo₂S₄ (CCS) surfaces, significantly enhancing CO₂ photoreduction activity. Moreover, the V_S induces a highly delocalized electron distribution, resulting in increased charge accumulation on the nearby Cu and Co atoms and a consequent shortening of their distance from 3.3 to 2.7 Å. This contributes to the formation of Cu–Co metallic bonds via local metallization. The resulting Cu–Co dual-metal active sites not only transform the endergonic rate-determining step (*CO dimerization to *COCO) on pure CCS into an exergonic one to promote C–C coupling, but also reduce the overall activation energy barrier, synergistically boosting C₂H₄ production. Employing H₂O vapor (which dissociates on the CS surface) as both hydrogen source and hole scavenger, the optimal CS/CCS photocatalyst (CS/CCS-10) achieves a C₂H₄ production rate of 28.79 μmol g⁻¹h⁻¹ with 93.95% electron selectivity (corresponding to 72.14% product selectivity), outperforming most reported photocatalysts under comparable conditions. This work demonstrates a synergistic strategy combining interfacial chemical bonds and metal bond-connected dual-metal sites with the asymmetric charge distribution to fabricate high-performance photocatalysts for CO₂ reduction to C₂₊ products.

光催化CO2还原成有价值的C2+产品仍然是一个重大挑战，主要是由于电子转移和利用效率低下，以及C-C耦合动力学缓慢。本文设计并制备了以Co-S键为界面桥接并含有丰富S空位（VS）的CoS/CuCo2S4 （CS/CCS）空心纳米球异质结构光催化剂。界面Co-S键作为原子级通道，促进了光诱导载流子的分离和转移，并将光生电子主要集中在CuCo2S4 （CCS）表面，显著增强了CO2光还原活性。此外，VS诱导了高度离域的电子分布，导致附近Cu和Co原子上的电荷积累增加，从而使它们的距离从3.3缩短到2.7 Å。这有助于通过局部金属化形成Cu-Co金属键。由此产生的Cu-Co双金属活性位点不仅将纯CCS上的自能速率决定步骤（*CO二聚到*COCO）转变为自能性步骤，促进C-C耦合，而且还降低了总体活化能垒，协同促进C2H4的产生。采用水蒸气（在CS表面解离）作为氢源和空穴清除剂，最佳CS/CCS光催化剂（CS/CCS-10）的C2H4产率为28.79 μmol g−1h−1，电子选择性为93.95%（对应于72.14%的产物选择性），优于目前报道的大多数同等条件下的光催化剂。这项工作展示了一种结合界面化学键和金属键连接的双金属位点与不对称电荷分布的协同策略，以制造高性能光催化剂，用于将CO2还原为C2+产品。

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引用次数: 0

Orbital-engineered layered MnO2 cathode enabled by Ca2+ interlayer coupling in rechargeable calcium battery 可充电钙电池中Ca2+层间耦合实现的轨道工程层状二氧化锰阴极

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2025-12-16 DOI: 10.1016/j.jechem.2025.12.012

Xiaomin Han , Lihua Wang , Ran Zhao , Luyang Yu , Zhaolin Gou , Jingjing Yang , Zhifan Hu , Mengge Lv , Feng Wu , Ying Bai , Chuan Wu

Developing multivalent-ion storage systems demands cathode materials that combine high structural adaptability with favorable orbital interactions to host sluggish, highly charged carriers such as Ca²⁺. Herein, a multi-synergistic interlayer engineering strategy is proposed via Ca²⁺ interlayer coordination. The pre-coordination of Ca²⁺ ions establishes Mn–O–Ca bridges that not only expand the interlayer distance but also reshape the local orbital field of Mn, thereby stabilizing the high-valence Mn states and suppressing Jahn-Teller distortion. Defect-induced orbital reconfiguration simultaneously enhances electronic delocalization and interlayer polarity by creating localized charge imbalances at oxygen vacancies. As a result, efficient charge transfer and Ca²⁺ diffusion are promoted, and more surface-active sites are exposed. Electrochemical evaluations reveal that Ca-MnO₂ exhibits significantly improved reversible capacity (∼100 mA h g⁻¹ at 0.1 A g⁻¹) and long-term cycling stability (1200 cycles at 1 A g⁻¹), outperforming pristine δ-MnO₂. Kinetic analysis through CV, GITT, and EIS demonstrates enhanced Ca²⁺ diffusion coefficients and reduced polarization in the pre-intercalated material. These results demonstrate an orbital-coupled interlayer engineering route toward high-performance Mn-based hosts for next-generation multivalent batteries.

开发多价离子存储系统需要阴极材料结合高结构适应性和有利的轨道相互作用，以承载缓慢的高电荷载流子，如Ca2+。本文提出了一种基于Ca2+层间协同的多协同层间工程策略。Ca2+离子的预配位建立了Mn - o - ca桥，不仅扩大了层间距离，而且重塑了Mn的局部轨道场，从而稳定了Mn的高价态，抑制了Jahn-Teller畸变。缺陷引起的轨道重构通过在氧空位处产生局域电荷不平衡，同时增强了电子离域和层间极性。因此，促进了有效的电荷转移和Ca2+扩散，并暴露了更多的表面活性位点。电化学评价表明，Ca-MnO2表现出明显改善的可逆容量（在0.1 A g−1下约100 mA h g−1）和长期循环稳定性（在1 A g−1下1200次循环），优于原始δ-MnO2。通过CV、GITT和EIS进行的动力学分析表明，预插层材料中的Ca2+扩散系数增强，极化降低。这些结果为下一代多价电池的高性能锰基宿主提供了轨道耦合层间工程路线。

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引用次数: 0

Tailoring V–O–Ti heterointerfaces to enhance ion kinetics in Na3V2(PO4)2F3 cathode for durable sodium-ion storage 定制V-O-Ti异质界面以增强Na3V2(PO4)2F3阴极中的离子动力学，用于持久的钠离子存储

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-04 DOI: 10.1016/j.jechem.2025.12.049

Yihong Gao , Pengcheng Shi , Xiaolong Cheng , Daochuan Jiang , Xinping Tao , Shikuo Li , Hui Zhang , Fangzhi Huang , Yu Jiang

Na₃V₂(PO₄)₂F₃ (NVPF) is regarded as an attractive cathode for sodium ion batteries (NIBs). However, NVPF suffers from low intrinsic electronic conductivity and unsatisfactory diffusion kinetics, which restrict its rate capability and long cycling lifespan. Herein, we propose that a two-dimensional heterostructure consists of uniform NVPF nanoparticles (denoted as n-NVPF) implanted on ultrathin Ti₃C₂ MXene nanosheets (denoted as n-NVPF-TC), featuring enriched V–O–Ti covalent bonds at the heterointerface, where Ti₃C₂ MXene nanosheets not only provide an efficient conductive network for electrons/ions but alleviate stress concentration caused by volume expansion during cycling. Furthermore, the V–O–Ti covalent bonds can stabilize the heterostructure and promote the Na⁺ storage kinetics. Consequently, n-NVPF-TC exhibits remarkable rate capability (64 mAh g⁻¹ at 40 C) and ultralong cycling lifespan of 2500 cycles with capacity retention of 80% at 15 C. When coupled with a hard carbon anode, the full cell delivers a high energy density (406 Wh kg⁻¹) and good cyclability. This work provides new insights into understanding the effect of morphology and heterointerface on sodium storage kinetics of cathodes and tremendously promotes the high-rate performance of NIBs.

Na3V2(PO4)2F3 （NVPF）是一种极具吸引力的钠离子电池阴极材料。然而，NVPF的本征电导率低，扩散动力学不理想，这限制了它的速率能力和较长的循环寿命。在此，我们提出了一种二维异质结构，由均匀的NVPF纳米粒子（n-NVPF）植入超薄Ti3C2 MXene纳米片（n-NVPF- tc）组成，在异质界面上具有丰富的V-O-Ti共价键，Ti3C2 MXene纳米片不仅为电子/离子提供了有效的导电网络，而且减轻了循环过程中体积膨胀引起的应力集中。此外，V-O-Ti共价键可以稳定异质结构，促进Na+的储存动力学。因此，n-NVPF-TC具有卓越的倍率性能（40℃时为64 mAh g−1）和2500次的超长循环寿命，在15℃时容量保持率为80%。当与硬碳阳极相结合时，整个电池具有高能量密度（406 Wh kg−1）和良好的可循环性。这项工作为理解形态和异质界面对阴极钠储存动力学的影响提供了新的见解，并极大地促进了nib的高速率性能。

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引用次数: 0

Dual-interface charge migration polarization boosting broadband electromagnetic wave absorption 双界面电荷迁移极化促进宽带电磁波吸收

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-04 DOI: 10.1016/j.jechem.2025.12.047

Lanlan Xu , Xiao Liu , Zhike Si , Haixia Liao , Daguang Li , Guanghui Zhan , Gengping Wan , Lihong Wu , Guizhen Wang

Heterostructured materials, featuring multilevel dielectric polarization and synergistic magnetic-dielectric effects, offer a promising strategy for improving electromagnetic wave (EMW) absorption performance. Nevertheless, fully exploiting these functionalities requires precise nanoscale control over interfacial architecture, which remains a significant challenge in material design. Herein, we report the simultaneous growth of uniformly distributed Ni-decorated bamboo-like carbon nanotubes (CNTs) on both the inner and outer surfaces of carbon foam (CF) via heterogeneous nucleation. By precisely controlling the Ni/CNTs coverage on both surfaces, the relative contributions of interfacial polarization and conduction loss are effectively balanced. Space-charge regions formed at the Ni-CNTs and CNTs-CF heterointerfaces facilitate substantial charge transfer and asymmetric charge redistribution, thereby endowing the hierarchical foam with outstanding EMW absorption capacity. The resulting Ni/CNTs/CF composite achieves a minimum reflection loss of −61.73 dB and an effective absorption bandwidth of 5.52 GHz at an ultrathin thickness of 1.89 mm. This study provides a promising strategy for designing lightweight, broadband, and high-efficiency heterogeneous EMW absorbers.

异质结构材料具有多层介质极化和协同磁介电效应，是提高电磁波吸收性能的一种很有前途的方法。然而，充分利用这些功能需要对界面结构进行精确的纳米级控制，这仍然是材料设计中的一个重大挑战。在此，我们报道了通过非均相成核在泡沫碳（CF）的内外表面同时生长均匀分布的ni装饰竹状碳纳米管（CNTs）。通过精确控制Ni/CNTs在两个表面的覆盖，可以有效地平衡界面极化和传导损失的相对贡献。在Ni-CNTs和CNTs-CF异质界面处形成的空间电荷区促进了大量电荷转移和不对称电荷再分布，从而使分层泡沫具有出色的EMW吸收能力。制备的Ni/CNTs/CF复合材料在1.89 mm的超薄厚度下，反射损耗最小为- 61.73 dB，有效吸收带宽为5.52 GHz。该研究为设计轻量、宽带、高效的异质EMW吸波器提供了一种有前景的策略。

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引用次数: 0

Molecular sieving and skeletal engineering of a pitch precursor to overcome reaction heterogeneity for high-performance hard carbon anodes in sodium-ion batteries 钠离子电池中高性能硬碳阳极沥青前驱体的分子筛分和骨架工程以克服反应非均质性

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-12 DOI: 10.1016/j.jechem.2026.01.004

Zenghao Wang , Bin Lou , Jun Li , Luning Chai , Ning Xiang , Shifu Cheng , Zhichen Zhang , Xiangen Shan , Rongheng Gou , Dong Liu

Pitch-derived hard carbons (HC) are promising anodes for sodium-ion batteries (SIBs) due to their high carbonization yield and low cost. However, the inherent compositional heterogeneity of pitch induces non-uniform oxidative cross-linking during conventional pre-oxidation, which not only renders the microstructure of HC difficult to regulate but also significantly degrades its sodium storage performance. Here, we identify the “shielding effect” of oxidation-inert components in pitch as the root cause of this structural inhomogeneity. To overcome this limitation, we propose a novel “sieving-and-reinforcement strategy”. This involves liquid-phase crosslinking to construct a polar three-dimensional (3D) carbon skeleton, followed by stepwise extraction as a molecular sieving process to remove inert components and expose the reactive skeleton, and finally, oxygen etching as a reinforcement step to drastically enhance the crosslinking density and defect population. This controllably engineered carbon skeleton in-situ evolves into an HC with a uniform hierarchical porous structure, featuring abundant ultra-micropores, optimally sized closed pores (∼2.15 nm), and ultrathin pore walls during carbonization. The resulting HC anode delivers a high reversible capacity of 363.3 mAh g⁻¹ at 50 mA g⁻¹, with an impressive plateau capacity contribution of 71.5%. It also demonstrates exceptional cycling stability, retaining 203.1 mAh g⁻¹ after 500 cycles at a high current density of 1000 mA g⁻¹. This work provides a fundamental understanding of precursor engineering, paving the way for the rational design of advanced carbon materials for next-generation energy storage.

沥青衍生硬碳（HC）具有炭化率高、成本低等优点，是钠离子电池（sib）极具发展前景的阳极材料。然而，沥青固有的组成不均一性导致常规预氧化过程中氧化交联不均匀，不仅使HC的微观结构难以调控，而且显著降低了其储钠性能。在这里，我们确定沥青中氧化惰性成分的“屏蔽效应”是这种结构不均匀的根本原因。为了克服这一限制，我们提出了一种新的“筛分加固策略”。这包括液相交联构建极性三维（3D）碳骨架，随后逐步提取作为分子筛选过程，以去除惰性成分并暴露活性骨架，最后，氧蚀刻作为强化步骤，以大幅提高交联密度和缺陷数量。这种可控工程碳骨架在原位演化成具有均匀分层多孔结构的HC，在碳化过程中具有丰富的超微孔、最佳尺寸的封闭孔（~ 2.15 nm）和超薄孔壁。由此产生的HC阳极在50 mA g - 1时提供363.3 mAh g - 1的高可逆容量，具有令人印象深刻的71.5%的平台容量贡献。它还表现出卓越的循环稳定性，在1000 mA g−1的高电流密度下，500次循环后保持203.1 mAh g−1。这项工作为前体工程提供了基本的理解，为下一代储能先进碳材料的合理设计铺平了道路。

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引用次数: 0

Multi-scale coherent interfaces in core–shell Sr0.875La0.1TiO3-based textured ceramics for enhanced high temperature thermoelectric performance sr0.875 la0.1 tio3基织构陶瓷的多尺度相干界面增强高温热电性能

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-02 DOI: 10.1016/j.jechem.2025.12.044

Zhihao Lou , Ziyao Wei , Xiaoyu Xu , Ping Zhang , Jingji Zhang , Jie Xu , Feng Gao

SrTiO₃-based thermoelectric ceramics show potential for high-temperature energy harvesting but face challenges from inefficient carrier transport and high thermal conductivity. This work presents a multi-scale structural engineering strategy to address these challenges, fabricating textured Sr_0.875La_0.1TiO₃/nm Ti/10 wt% Bi₂O₃ (SLTTB) ceramics via plate-like SrTiO₃ templates. Through this design, the ceramics form a unique core–shell architecture, where template seeds act as growth cores for epitaxially aligned <100> oriented grains, forming coherent interfaces with a precipitate-rich interlayer and a precipitate-free shell. In the interlayer, uniformly distributed “peanut-shaped” Bi-Ti_nO₂_n₋₁ nanoparticle pairs enhance electron mobility and phonon scattering. The hierarchical microstructure creates multi-scale coherent interfaces that reduce electron grain boundary scattering, enabling preferential electron transport pathways parallel to the casting direction. This architecture enables the decoupling of electrical and thermal properties, with a power factor reaching 1815 μW/m/K² at 1073 K with thermal conductivity suppressed by interfacial and nanoparticle scattering. Consequently, the SLTTB textured ceramic achieves a notable ZT of 0.64 at 1073 K, a significant enhancement over conventional counterparts. This work demonstrates a multi-scale structural strategy integrating template-induced texture, core–shell design, and nanoscale interface modulation to decouple the electrical and thermal properties of SrTiO₃-based materials, and provides a roadmap for tailoring the electrical-thermal transport properties of thermoelectric textured ceramics.

srtio3基热电陶瓷显示出高温能量收集的潜力，但面临着载流子输运效率低和热导率高的挑战。这项工作提出了一种多尺度结构工程策略来解决这些挑战，通过板状SrTiO3模板制造有纹理的Sr0.875La0.1TiO3/nm Ti/10 wt% Bi2O3 （SLTTB）陶瓷。通过这种设计，陶瓷形成了独特的核壳结构，其中模板种子作为外延排列的<；100>；取向晶粒的生长核心，与富含沉淀的中间层和无沉淀的壳形成相干界面。在中间层中，均匀分布的“花生状”Bi-TinO2n−1纳米粒子对增强了电子迁移率和声子散射。分层微观结构创造了多尺度相干界面，减少了电子晶界散射，使优先的电子传递路径平行于铸造方向。该结构实现了电学和热性能的解耦，在1073 K时功率因数达到1815 μW/m/K2，热导率受到界面和纳米颗粒散射的抑制。因此，SLTTB织构陶瓷在1073 K时达到了0.64的ZT，比传统陶瓷有了显著的提高。这项工作展示了一种集成模板诱导织构、核壳设计和纳米级界面调制的多尺度结构策略，以解耦srtio3基材料的电学和热性能，并为定制热电织构陶瓷的电学和热输运特性提供了路线图。

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引用次数: 0

Distortions induced by Cu-doping enable accelerated oxygen reduction kinetics in Co-free SrFe0.9Nb0.1O3−δ for metal-supported SOFCs cu掺杂引起的畸变加速了金属负载SOFCs中无co的SrFe0.9Nb0.1O3−δ的氧还原动力学

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-19 DOI: 10.1016/j.jechem.2026.01.013

Fei-Fei Lu , Ru-Yi Hou , Qi Ma , Jia-Hong Li , Chang-Jiu Li , Venkataraman Thangadurai , Cheng-Xin Li

Metal-supported solid oxide fuel cells (MS-SOFCs) offer superior mechanical strength and fast start-up, but the mismatch between metal and cathode (oxygen electrode) components poses challenges for developing compatible, high-activity cathodes at intermediate-to-low temperatures (IL-T). Recently, cobalt-free cathode materials have attracted significant attention, especially donor-doped SrFeO₃₋_δ. To further improve their redox performance at IL-T, density functional theory (DFT) calculations were employed in this study to design Cu-doped SrFe_0.9Nb_0.1O₃₋_δ cathodes, revealing the correlation between Cu-doping and lattice distortion. DFT results indicate that moderate Cu-doping at the B site promotes defect formation and effectively reduces the oxygen vacancy formation energy of the parent SrFe_0.9Nb_0.1O₃₋_δ, while excessive Cu-doping limits the oxygen vacancy formation. Guided by theoretical insights, SrFe_0.9−_xNb_0.1Cu_xO₃₋_δ (SFNCx, x = 0, 0.05, 0.10, 0.15, and 0.20) materials were synthesized, and experimental results further support the DFT conclusions. The optimized SFNC10 composition exhibited the highest oxygen vacancy concentration and achieved a polarization resistance of 0.15 Ω cm² at 650 °C. Moreover, this work provides the first demonstration of the SFNC10 cathode applied in an MS-SOFC, with the configuration of FeCr||NiO-GDC||CoGDC||SFNC10, operating stably at 200 mA cm⁻² for over 60 h and delivering a peak power density of 728.9 mW cm⁻² at 700 °C.

金属支撑固体氧化物燃料电池（MS-SOFCs）具有优异的机械强度和快速启动能力，但金属和阴极（氧电极）组件之间的不匹配为开发兼容的中低温高活性阴极（IL-T）带来了挑战。近年来，无钴正极材料引起了人们的极大关注，尤其是供体掺杂SrFeO3−δ。为了进一步提高它们在IL-T下的氧化还原性能，本研究采用密度泛函理论（DFT）计算设计了cu掺杂的SrFe0.9Nb0.1O3−δ阴极，揭示了cu掺杂与晶格畸变之间的关系。DFT结果表明，在B位适度掺杂cu促进了缺陷的形成，有效降低了母材SrFe0.9Nb0.1O3−δ的氧空位形成能，而过量掺杂cu则限制了氧空位的形成。在理论指导下，合成了SrFe0.9−xNb0.1CuxO3−δ （SFNCx, x = 0, 0.05, 0.10, 0.15和0.20）材料，实验结果进一步支持了DFT的结论。优化后的SFNC10在650℃时氧空位浓度最高，极化电阻为0.15 Ω cm2。此外，这项工作首次展示了SFNC10阴极在MS-SOFC中的应用，其结构为FeCr||NiO-GDC||CoGDC||SFNC10，在200 mA cm - 2下稳定工作超过60小时，在700°C下提供728.9 mW cm - 2的峰值功率密度。

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引用次数: 0

CeO2 regulated vacancies and coordination environment of δ-MnO2 cathode for durable flexible zinc-ion batteries CeO2调控柔性锌离子电池δ-MnO2正极的空位和配位环境

IF 14.9 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2026-05-01 Epub Date: 2026-01-19 DOI: 10.1016/j.jechem.2026.01.012

Shang Wang , Meng Xie , Jiayue Wen , Xinxin Wang , Xinyang Ma , Geng Li , Qing Sun , Yanhong Tian

Aqueous Zn||MnO₂ batteries have emerged as highly promising for flexible energy storage systems due to their intrinsic safety and environmental benignity. However, their application remains hindered by the limited density of electrochemically active sites, poor structural stability, and ambiguous charge-storage mechanisms of MnO₂ cathodes. Herein, a CeO₂ nanoparticle-modified layered δ-MnO₂ microcrystalline cathode (CeO₂@δ-MnO₂) is rationally designed, and the underlying energy-storage mechanisms of the Zn||CeO₂@δ-MnO₂ battery are systematically investigated. The short-range ordered microcrystalline structure of δ-MnO₂ effectively tailors the coordination environment of Mn centers, inducing abundant oxygen vacancies (V_o) that facilitate synergistic H⁺/Zn²⁺ co-insertion, thereby substantially enhancing charge-storage capability. Meanwhile, the incorporation of CeO₂ nanoparticles not only reinforces the structural integrity of the layered δ-MnO₂ framework but also triggers pronounced Jahn-Teller distortion, which further promotes V_o formation and accelerates electrochemical kinetics. Benefiting from these synergistic effects, the Zn||CeO₂@δ-MnO₂ battery delivers a high reversible capacity of 372.6 mA h g⁻¹ at 0.5 A g⁻¹ and retains 92.14% of its initial capacity after 2000 cycles, markedly outperforming pristine δ-MnO₂. Furthermore, a flexible quasi-solid-state zinc-ion battery with a sandwich configuration exhibits excellent mechanical flexibility and safety, maintaining a high capacity of 240 mA h g⁻¹ after 300 bending cycles. This work provides an effective defect- and distortion-engineering strategy for the rational design of high-performance flexible MnO₂-based cathodes.

由于其固有的安全性和环境友好性，含水锌b| MnO2电池在柔性储能系统中具有很高的应用前景。然而，它们的应用仍然受到电化学活性位点密度有限、结构稳定性差和MnO2阴极电荷存储机制不明确的阻碍。本文合理设计了CeO2纳米粒子修饰层状δ-MnO2微晶阴极（CeO2@δ-MnO2），系统研究了Zn||CeO2@δ-MnO2电池的储能机理。δ-MnO2的短程有序微晶结构有效地调整了Mn中心的配位环境，诱导了丰富的氧空位（Vo），促进了H+/Zn2+的协同插入，从而大大提高了电荷存储能力。同时，CeO2纳米颗粒的掺入不仅增强了层状δ-MnO2框架的结构完整性，而且引发了明显的Jahn-Teller畸变，进一步促进了Vo的形成，加速了电化学动力学。得益于这些协同效应，Zn||CeO2@δ-MnO2电池在0.5 a g - 1下可提供372.6 mA h g - 1的高可逆容量，并且在2000次循环后仍保持其初始容量的92.14%，明显优于原始δ-MnO2电池。此外，具有三明治结构的柔性准固态锌离子电池具有优异的机械灵活性和安全性，在300次弯曲循环后保持240 mA h g−1的高容量。本研究为高性能柔性二氧化锰阴极的合理设计提供了一种有效的缺陷和畸变工程策略。

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引用次数: 0