Journal of Energy Chemistry最新文献

Catalytic production of high-energy-density spiro polycyclic jet fuel with biomass derivatives 用生物质衍生物催化生产高能量密度螺多环喷气燃料

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-30 DOI: 10.1016/j.jechem.2024.10.024

Wen-Jing Zhang , Yan-Cheng Hu , Yan-Hong Tan , Jia Li , Ning Li , Jing-Pei Cao

High-energy-density (HED) fuel (e.g. widely used JP-10 and RJ-4), featuring compact 3D polycyclic structure with high strain, is of critical importance for volume-limited military aircraft, since their high density and combustion heat can provide more propulsion energy. To reduce the reliance on petroleum source, it is highly desirable to develop renewable alternatives for the production of strained polycyclic HED fuel, but which remains a big challenge because of the inaccessibility caused by the high strain. We herein demonstrate a three-step catalytic route towards highly strained C₁₇ and C₁₈ spirofuel with biomass feedstocks. The process includes catalytic aldol condensation of renewable cyclohexanone/cyclopentanone with benzaldehyde, catalytic spiro Diels-Alder (D-A) reaction of aldol adduct with isoprene, and catalytic hydrodeoxygenation. The key spiro D-A reaction is enabled by the catalysis of heterogeneous Lewis acidic ionic liquid. The chloroaluminate IL, formed by benign urea and AlCl₃, exhibits good catalytic performance and reusability for this step. An eventual hydrodeoxygenation (HDO) over Pd/C and H-Y produces strained tricyclic spirofuel with density >0.93 g/mL, combustion heat >41 MJ/L and freezing point < −40 °C, which are better than the properties of tactical fuel RJ-4. Therefore, it is anticipated that the as-prepared renewable fuels have the potential to replace traditional petroleum-derived HED fuels.

高能量密度（HED）燃料（如广泛使用的 JP-10 和 RJ-4）具有高应变的紧凑三维多环结构，对体积有限的军用飞机至关重要，因为其高密度和燃烧热可提供更多推进能量。为了减少对石油资源的依赖，开发生产应变多环 HED 燃料的可再生替代品是非常可取的，但由于高应变造成的不可获取性，这仍然是一个巨大的挑战。在此，我们展示了利用生物质原料生产高应变 C17 和 C18 螺烷燃料的三步催化路线。该工艺包括可再生环己酮/环戊酮与苯甲醛的催化醛缩合反应、醛加合物与异戊二烯的催化螺 Diels-Alder (D-A) 反应以及催化加氢脱氧反应。关键的螺 D-A 反应是由异相路易斯酸离子液体催化实现的。由良性脲和 AlCl3 生成的氯铝酸盐离子液体在这一步骤中表现出良好的催化性能和重复使用性。最终在 Pd/C 和 H-Y 上进行加氢脱氧（HDO）生成了拉伸三环螺环燃料，其密度为 0.93 g/mL，燃烧热为 41 MJ/L，凝固点为 -40 °C，优于战术燃料 RJ-4。因此，预计制备的可再生燃料具有替代传统石油衍生 HED 燃料的潜力。

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引用次数: 0

Metallized polymer current collector as “stress acceptor” for stable micron-sized silicon anodes 金属化聚合物集流器作为稳定的微米级硅阳极的 "应力接收器

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.jechem.2024.09.071

Ziyi Cao , Haoteng Sun , Yi Zhang , Lixia Yuan , Yaqi Liao , Haijin Ji , Shuaipeng Hao , Zhen Li , Long Qie , Yunhui Huang

Micron-sized silicon (μSi) is a promising anode material for next-generation lithium-ion batteries due to its high specific capacity, low cost, and abundant reserves. However, the volume expansion that occurs during cycling leads to the accumulation of undesirable stresses, resulting in pulverization of silicon microparticles and shortened lifespan of the batteries. Herein, a composite film of Cu-PET-Cu is proposed as the current collector (CC) for μSi anodes to replace the conventional Cu CC. Cu-PET-Cu CC is prepared by depositing Cu on both sides of a polyethylene terephthalate (PET) film. The PET layer promises good ductility of the film, permitting the Cu-PET-Cu CC to accommodate the volumetric changes of silicon microparticles and facilitates the stress release through ductile deformation. As a result, the μSi electrode with Cu-PET-Cu CC retains a high specific capacity of 2181 mA h g⁻¹, whereas the μSi electrode with Cu CC (μSi/Cu) exhibits a specific capacity of 1285 mA h g⁻¹ after 80 cycles. The stress relieving effect of Cu-PET-Cu was demonstrated by in-situ fiber optic stress monitoring and multi-physics simulations. This work proposes an effective stress relief strategy at the electrode level for the practical implementation of μSi anodes.

微米级硅 (μSi)具有比容量高、成本低和储量丰富等优点，是下一代锂离子电池的理想负极材料。然而，在循环过程中发生的体积膨胀会导致不良应力的积累，从而导致硅微颗粒的粉碎和电池寿命的缩短。本文提出了一种 Cu-PET-Cu 复合薄膜作为微硅阳极的集流器（CC），以取代传统的 Cu CC。Cu-PET-Cu CC 是通过在聚对苯二甲酸乙二醇酯（PET）薄膜的两面沉积铜来制备的。PET 层保证了薄膜的良好延展性，使 Cu-PET-Cu CC 能够适应硅微颗粒的体积变化，并通过延展变形促进应力释放。因此，带有 Cu-PET-Cu CC 的微硅电极在 80 个循环后仍能保持 2181 mA h g-1 的高比容量，而带有 Cu CC 的微硅电极（μSi/Cu）的比容量为 1285 mA h g-1。原位光纤应力监测和多物理场仿真证明了 Cu-PET-Cu 的应力消除效果。这项研究提出了一种有效的电极应力消除策略，可用于μSi 阳极的实际应用。

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引用次数: 0

Microdynamic modulation through Pt–O–Ni proton and electron “superhighway” for pH-universal hydrogen evolution 通过铂-氧-镍质子和电子 "高速公路 "的微动力调制实现 pH 值通用氢进化

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.jechem.2024.10.020

Dewen Wang , Yuting Chen , Bohan Yao , Tian Meng , Yanchao Xu , Dongxu Jiao , Zhicai Xing , Xiurong Yang

Optimizing the microdynamics in alkaline and neutral conditions is a significant but challenging task in developing pH-universal hydrogen evolution (HER) electrocatalysts. Herein, a unique Pt–O–Ni bridge has been constructed to alter the coordination and electronic environment between Pt nanoparticles (Pt_n) and nickel metaphosphate (NPO) substrate (Pt-NPO). Sufficient electron transfer from NPO to Pt_n to maintain an electron-rich environment and a low valence state of Pt_n. Furthermore, H* is produced from the H₂O dissociation on Ni site and then spillover toward Pt sites to bind into H₂, which makes up for the insufficient H₂O dissociation ability of Pt in Volmer step. Pt-NPO exhibits long-term stability and only need the overpotentials of 22.3, 33.0 and 30.5 mV to attain 10 mA cm⁻² in alkaline, neutral and acidic media, respectively. The anion-exchange membrane (AEM) water electrolyzer catalyzed by Pt-NPO shows high water electrolysis performance that a cell voltage of 1.73 V is needed to obtain the current density of 500 mA cm⁻² in 1 M KOH at 80 °C, at the same time maintains good stability for 350 h. The regulation strategy proposed in this work is helpful for the design and synthesis of highly efficient pH-universal HER electrocatalysts.

优化碱性和中性条件下的微动力学是开发 pH 值通用型氢进化（HER）电催化剂的一项重要而又具有挑战性的任务。在此，我们构建了一种独特的铂-氧-镍桥，以改变铂纳米粒子（Ptn）和偏磷酸镍（NPO）底物（Pt-NPO）之间的配位和电子环境。从 NPO 到 Ptn 的充分电子传递维持了 Ptn 的富电子环境和低价态。此外，镍位点解离出的 H2O 产生 H*，然后溢出到铂位点结合成 H2，这弥补了铂在 Volmer 步骤中解离 H2O 能力的不足。Pt-NPO 具有长期稳定性，在碱性、中性和酸性介质中分别只需 22.3、33.0 和 30.5 mV 的过电位即可达到 10 mA cm-2。由 Pt-NPO 催化的阴离子交换膜（AEM）水电解槽具有很高的水电解性能，在 80 °C 的 1 M KOH 溶液中，需要 1.73 V 的电池电压才能获得 500 mA cm-2 的电流密度，同时还能在 350 h 内保持良好的稳定性。

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引用次数: 0

High-areal-capacity and long-life sulfide-based all-solid-state lithium battery achieved by regulating surface-to-bulk oxygen activity 通过调节表层与内层之间的氧活度实现高铝容量和长寿命硫化物全固态锂电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-29 DOI: 10.1016/j.jechem.2024.10.022

Yanchen Liu , Yang Lu , Zongliang Zhang , Bin Xu , Fangbo He , Yang Liu , Yongle Chen , Kun Zhang , Fangyang Liu

Sulfide-based all-solid-state lithium batteries (ASSLBs) with nickel-rich oxide cathodes are emerging as primary contenders for the next generation rechargeable batteries, owing to their superior safety and energy density. However, the all-solid-state batteries with nickel-rich oxide cathodes suffer from performance degradation due to the reactions between the highly reactive surface oxygen of the cathode and the electrolyte, as well as the instability of the bulk oxygen structure in the cathode. Herein, we propose a synergistic modification design scheme to adjust the oxygen activity from surface to bulk. The LiBO₂ coating inhibits the reactivity of surface lattice oxygen ions. Meanwhile, Zr doping in the bulk phase forms strong Zr–O covalent bonds that stabilize the bulk lattice oxygen structure. The synergistic effect of these modifications prevents the release of oxygen, thus avoiding the degradation of the cathode/SE interface. Additionally, the regulation of surface-to-bulk oxygen activity establishes a highly stable interface, thereby enhancing the lithium ion diffusion kinetics and mechanical stability of the cathode. Consequently, cathodes modified with this synergistic strategy exhibit outstanding performance in sulfide-based ASSLBs, including an ultra-long cycle life of 100,000 cycles, ultra-high rate capability at 45C, and 85% high active material content in the composite cathode. Additionally, ASSLB exhibits stable cycling under high loading conditions of 82.82 mg cm⁻², achieving an areal capacity of 17.90 mA h cm⁻². These encouraging results pave the way for practical applications of ASSLBs in fast charging, long cycle life, and high energy density in the future.

具有富氧化镍阴极的硫化物全固态锂电池（ASSLBs）因其卓越的安全性和能量密度，正在成为下一代可充电电池的主要竞争者。然而，由于阴极高活性表面氧与电解质之间的反应以及阴极中大量氧结构的不稳定性，采用富镍氧化物阴极的全固态电池存在性能下降的问题。在此，我们提出了一种协同改性设计方案，以调整从表面到体积的氧活性。LiBO2 涂层抑制了表面晶格氧离子的反应活性。同时，在体相中掺杂 Zr 可形成强 Zr-O 共价键，从而稳定体相晶格氧结构。这些改性的协同效应阻止了氧的释放，从而避免了阴极/SE 界面的降解。此外，通过调节表层到体层的氧活性，可建立一个高度稳定的界面，从而提高锂离子扩散动力学和阴极的机械稳定性。因此，采用这种协同策略改性的阴极在硫化物基 ASSLB 中表现出卓越的性能，包括 100,000 次的超长循环寿命、45℃ 时的超高速率能力以及复合阴极中 85% 的高活性材料含量。此外，ASSLB 还能在 82.82 mg cm-2 的高负载条件下稳定循环，实现 17.90 mA h cm-2 的等效容量。这些令人鼓舞的结果为 ASSLB 未来在快速充电、长循环寿命和高能量密度方面的实际应用铺平了道路。

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引用次数: 0

Building Li–S batteries with enhanced temperature adaptability via a redox-active COF-based barrier-trapping electrocatalyst 通过基于氧化还原活性 COF 的势垒捕获电催化剂，构建具有更强温度适应性的锂-S 电池

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-24 DOI: 10.1016/j.jechem.2024.10.019

Jie Xu , Acheng Zhu , Zhangyu Zheng , Yiming Qi , Yuwen Cheng , Yongjie Cao , Bo Peng , Lianbo Ma , Yonggang Wang

Covalent organic frameworks (COFs) are promising materials for mitigating polysulfide shuttling in lithium-sulfur (Li–S) batteries, but enhancing their ability to convert polysulfides across a wide temperature range remains a challenge. Herein, we introduce a redox-active COF (RaCOF) that functions as both a physical barrier and a kinetic enhancer to improve the temperature adaptability of Li–S batteries. The RaCOF constructed from redox-active anthraquinone units accelerates polysulfide conversion kinetics through reversible C=O/C-OLi transformations within a voltage range of 1.7 to 2.8 V (vs. Li⁺/Li), optimizing sulfur redox reactions in ether-based electrolytes. Unlike conventional COFs, RaCOF provides bidentate trapping of polysulfides, increasing binding energy and facilitating more effective polysulfide management. In-situ XRD and ToF-SIMS analyses confirm that RaCOF enhances polysulfide adsorption and promotes the transformation of lithium sulfide (Li₂S), leading to better sulfur cathode reutilization. Consequently, RaCOF-modified Li–S batteries demonstrate low self-discharge (4.0% decay over a 7-day rest), excellent wide-temperature performance (stable from −10 to + 60 °C), and high-rate cycling stability (94% capacity retention over 500 cycles at 5.0 C). This work offers valuable insights for designing COF structures aimed at achieving temperature-adaptive performance in rechargeable batteries.

共价有机框架（COF）是减轻锂硫（Li-S）电池中多聚硫化物穿梭现象的理想材料，但提高其在宽温度范围内转化多聚硫化物的能力仍是一项挑战。在此，我们介绍一种氧化还原活性 COF（RaCOF），它既是物理屏障，又是动力学增强剂，可提高锂-硫电池的温度适应性。由具有氧化还原活性的蒽醌单元构建而成的 RaCOF 可在 1.7 至 2.8 V（相对于 Li+/Li）的电压范围内通过 C=O/C-OLi 的可逆转化加速多硫化物的转化动力学，从而优化醚基电解质中的硫氧化还原反应。与传统的 COF 不同，RaCOF 提供了对多硫化物的双齿捕集，增加了结合能，有利于更有效地管理多硫化物。原位 XRD 和 ToF-SIMS 分析证实，RaCOF 可增强对多硫化物的吸附，促进硫化锂（Li2S）的转化，从而提高硫阴极的再利用率。因此，RaCOF 改性锂-S 电池表现出较低的自放电率（静置 7 天衰减 4.0%）、优异的宽温性能（在 -10 至 + 60 °C 范围内稳定）和高倍率循环稳定性（在 5.0 C 下循环 500 次，容量保持率 94%）。这项研究为设计 COF 结构以实现充电电池的温度适应性能提供了宝贵的见解。

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引用次数: 0

Introducing strong metal–oxygen bonds to suppress the Jahn-Teller effect and enhance the structural stability of Ni/Co-free Mn-based layered oxide cathodes for potassium-ion batteries 引入强金属氧键以抑制贾恩-泰勒效应并增强用于钾离子电池的无镍/无钴锰基层状氧化物阴极的结构稳定性

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-24 DOI: 10.1016/j.jechem.2024.10.017

Yicheng Lin , Shaohua Luo , Pengyu Li , Jun Cong , Wei Zhao , Lixiong Qian , Qi Sun , Shengxue Yan

Mn-based layered oxides (KMO) have emerged as one of the promising low-cost cathodes for potassium-ion batteries (PIBs). However, due to the multiple-phase transitions and the distortion in the MnO₆ structure induced by the Jahn-Teller (JT) effect associated with Mn-ion, the cathode exhibits poor structural stability. Herein, we propose a strategy to enhance structural stability by introducing robust metal–oxygen (M–O) bonds, which can realize the pinning effect to constrain the distortion in the transition metal (TM) layer. Concurrently, all the elements employed have exceptionally high crustal abundance. As a proof of concept, the designed K_0.5Mn_0.9Mg_0.025Ti_0.025Al_0.05O₂ cathode exhibited a discharge capacity of approximately 100 mA h g⁻¹ at 20 mA g⁻¹ with 79% capacity retention over 50 cycles, and 73% capacity retention over 200 cycles at 200 mA g⁻¹, showcased much better battery performance than the designed cathode with less robust M–O bonds. The properties of the formed M–O bonds were investigated using theoretical calculations. The enhanced dynamics, mitigated JT effect, and improved structural stability were elucidated through the in-situ X-ray diffractometer (XRD), in-situ electrochemical impedance spectroscopy (EIS) (and distribution of relaxation times (DRT) method), and ex-situ X-ray absorption fine structure (XAFS) tests. This study holds substantial reference value for the future design of cost-effective Mn-based layered cathodes for PIBs.

锰基层氧化物（KMO）已成为钾离子电池（PIB）中一种前景广阔的低成本阴极。然而，由于多相转变以及与锰离子相关的贾恩-泰勒（JT）效应引起的 MnO6 结构畸变，该阴极的结构稳定性较差。在此，我们提出了一种增强结构稳定性的策略，即引入稳健的金属氧（M-O）键，从而实现针销效应，限制过渡金属（TM）层的畸变。同时，所采用的所有元素都具有极高的地壳丰度。作为概念验证，所设计的 K0.5Mn0.9Mg0.025Ti0.025Al0.05O2 阴极在 20 mA g-1 下的放电容量约为 100 mA h g-1，在 50 次循环中的容量保持率为 79%，在 200 mA g-1 下的 200 次循环中的容量保持率为 73%。我们通过理论计算研究了所形成的 M-O 键的特性。通过原位 X 射线衍射仪 (XRD)、原位电化学阻抗光谱 (EIS)（和弛豫时间分布 (DRT) 方法）和原位 X 射线吸收精细结构 (XAFS) 测试，阐明了 M-O 键的动态增强、JT 效应减弱和结构稳定性提高。这项研究对今后设计具有成本效益的锰基层状阴极用于 PIB 具有重要的参考价值。

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引用次数: 0

Realizing interfacial coupled electron/ion transport through reducing the interfacial oxygen density of carbon skeletons for high-performance lithium metal anodes 通过降低高性能锂金属阳极碳骨架的界面氧密度实现界面耦合电子/离子传输

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.063

Yao-Lu Ye , Yan Zhou , Huan Ye , Fei-Fei Cao

Lithium plating/stripping occurs at the anode/electrolyte interface which involves the flow of electrons from the current collector and the migration of lithium ions from the solid-electrolyte interphase (SEI). The dual continuous rapid transport of interfacial electron/ion is required for homogeneous Li deposition. Herein, we propose a strategy to improve the Li metal anode performance by rationally regulating the interfacial electron density and Li ion transport through the SEI film. This key technique involves decreasing the interfacial oxygen density of biomass-derived carbon host by regulating the arrangement of the celluloses precursor fibrils. The higher specific surface area and lower interfacial oxygen density decrease the local current density and ensure the formation of thin and even SEI film, which stabilized Li⁺ transfer through the Li/electrolyte interface. Moreover, the improved graphitization and the interconnected conducting network enhance the surface electronegativity of carbon and enable uninterruptible electron conduction. The result is continuous and rapid coupled interfacial electron/ion transport at the anode/electrolyte reaction interface, which facilitates uniform Li deposition and improves Li anode performance. The Li/C anode shows a high initial Coulombic efficiency of 98% and a long-term lifespan of over 150 cycles at a practical low N/P (negative-to-positive) ratio of 1.44 in full cells.

锂镀层/剥离发生在阳极/电解质界面上，涉及来自集流器的电子流和来自固体-电解质间相（SEI）的锂离子迁移。界面电子/离子的双重连续快速传输是均匀锂沉积所必需的。在此，我们提出了一种通过合理调节界面电子密度和锂离子在 SEI 薄膜中的传输来提高锂金属负极性能的策略。这项关键技术包括通过调节纤维素前体纤维的排列来降低生物质衍生碳宿主的界面氧密度。较高的比表面积和较低的界面氧密度降低了局部电流密度，确保了形成薄而均匀的 SEI 膜，从而稳定了 Li+ 通过锂/电解质界面的转移。此外，改进的石墨化和相互连接的导电网络增强了碳的表面电负性，实现了不间断的电子传导。其结果是在阳极/电解质反应界面上实现了连续、快速的耦合界面电子/离子传输，从而促进了锂的均匀沉积，提高了锂阳极的性能。锂/碳阳极的初始库仑效率高达 98%，在全电池中的实际低 N/P（负极与正极）比为 1.44 时，其长期寿命超过 150 个循环。

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引用次数: 0

P-tuned FeN2 binuclear sites for boosted CO2 electro-reduction 用于促进二氧化碳电还原的 P 调节型 FeN2 双核位点

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.011

Cao Guo , Sanshuang Gao , Jun Li , Menglin Zhou , Abdukader Abdukayum , Qingquan Kong , Yingtang Zhou , Guangzhi Hu

The recycling of CO₂ through electrochemical processes offers a promising solution for alleviating the greenhouse effect; however, the activation of CO₂ and desorption of *CO in electrocatalytic CO₂ reduction (ECR) frequently encounter high energy barriers and competitive hydrogen evolution reactions (HERs), which are urgent problems that need to be addressed. In this study, a catalyst (P₁₀₀–Fe–N/C) with homogeneous P–tuned FeN₂ binuclear sites (N₂PFe-FePN₂) was successfully synthesised, demonstrating satisfactory performance in the ECR to CO. P₁₀₀–Fe–N/C attains a peak FE_CO of 98.01% and a normalized TOF of 664.7 h⁻¹ at −0.7 V_RHE, surpassing the performance of the Fe binuclear catalyst without P and single-atoms catalysts. In the MEA cell, a FE_CO exceeding 90% can still be achieved. Density functional theory analysis indicates that the asymmetric coordination configuration induced by the incorporation of P facilitates a reduction in the system’s energy. The modulation of P results in the d-band centre of the catalyst being positioned closer to the Fermi level, which facilitates the interaction of the catalyst with CO₂, allowing more electrons to be injected into the CO₂ molecule at the Fe binuclear sites and inhibiting the HER. The P–tuned FeN₂ binuclear sites effectively lower the *CO desorption barrier.

通过电化学过程回收利用二氧化碳为缓解温室效应提供了一种前景广阔的解决方案；然而，在电催化二氧化碳还原（ECR）过程中，二氧化碳的活化和*CO的解吸经常会遇到高能量障碍和竞争性氢进化反应（HERs），这些都是亟待解决的问题。本研究成功合成了一种具有均相 P 调谐 FeN2 双核位点（N2PFe-FePN2）的催化剂（P100-Fe-N/C），在电催化 CO 还原中表现出令人满意的性能。P100-Fe-N/C 的峰值 FECO 为 98.01%，在 -0.7 VRHE 条件下的归一化 TOF 为 664.7 h-1，超过了不含 P 的 Fe 双核催化剂和单原子催化剂的性能。在 MEA 单元中，FECO 仍可超过 90%。密度泛函理论分析表明，P 的加入引起的不对称配位构型有助于降低系统能量。P 的调制使催化剂的 d 波段中心更接近费米级，从而促进了催化剂与 CO2 的相互作用，使更多的电子在 Fe 双核位点注入 CO2 分子，抑制了 HER。P调谐的 FeN2 双核位点有效降低了*CO 解吸障碍。

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引用次数: 0

Sulfur atom occupying surface oxygen vacancy to boost the charge transfer and stability for aqueous Bi2O3 electrode 硫原子占据表面氧空位，促进水性 Bi2O3 电极的电荷转移和稳定性

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.012

Guangmin Yang , Jianyan Lin , Guanwu Li , Tian Li , Dong Wang , Weitao Zheng

Oxygen vacancies (O_v) within metal oxide electrodes can enhance mass/charge transfer dynamics in energy storage systems. However, construction of surface O_v often leads to instability in electrode structure and irreversible electrochemical reactions, posing a significant challenge. To overcome these challenges, atomic heterostructures are employed to address the structural instability and enhance the mass/charge transfer dynamics associated with phase conversion mechanism in aqueous electrodes. Herein, we introduce an atomic S–Bi₂O₃ heterostructure (sulfur (S) anchoring on the surface O_v of Bi₂O₃). The integration of S within Bi₂O₃ lattice matrix triggers a charge imbalance at the heterointerfaces, ultimately resulting in the creation of a built-in electric field (BEF). Thus, the BEF attracts OH⁻ ions to be adsorbed onto Bi within the regions of high electron cloud overlap in S–Bi₂O₃, facilitating highly efficient charge transfer. Furthermore, the anchored S plays a pivotal role in preserving structural integrity, thus effectively stabilizing the phase conversion reaction of Bi₂O₃. As a result, the S–Bi₂O₃ electrode achieves 72.3 mA h g⁻¹ at 10 A g⁻¹ as well as high-capacity retention of 81.9% after 1600 cycles. Our innovative S–Bi₂O₃ design presents a groundbreaking approach for fabricating electrodes that exhibit efficient and stable mass and charge transfer capabilities. Furthermore, it enhances our understanding of the underlying reaction mechanism within energy storage electrodes.

金属氧化物电极中的氧空位（Ov）可增强储能系统中的质量/电荷转移动力学。然而，表面氧空位的形成往往会导致电极结构的不稳定性和不可逆的电化学反应，从而带来巨大的挑战。为了克服这些挑战，我们采用原子异质结构来解决结构不稳定问题，并增强水电极中与相转化机制相关的质量/电荷转移动力学。在此，我们介绍一种原子 S-Bi2O3 异质结构（硫（S）锚定在 Bi2O3 的表面 Ov 上）。S 在 Bi2O3 晶格基质中的整合引发了异质界面的电荷不平衡，最终导致内置电场（BEF）的产生。因此，内置电场吸引 OH 离子在 S-Bi2O3 的高电子云重叠区域内吸附到 Bi 上，从而促进了高效的电荷转移。此外，锚定的 S 在保持结构完整性方面起着关键作用，从而有效地稳定了 Bi2O3 的相转化反应。因此，S-Bi2O3 电极在 10 A g-1 的条件下可达到 72.3 mA h g-1，并在 1600 个循环后实现 81.9% 的高容量保持率。我们创新的 S-Bi2O3 设计为制造具有高效稳定的质量和电荷转移能力的电极提供了一种开创性的方法。此外，它还加深了我们对储能电极内部基本反应机制的理解。

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引用次数: 0

Cu3.21Bi4.79S9: Bimetal superionic strategy boosts ultrafast dynamics for Na-ion storage/extraction Cu3.21Bi4.79S9：双金属超离子策略提升了纳离子存储/萃取的超快动力学性能

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.061

Xu Han , Guoping Liu , Weiqiang Kong , Wenruo Li , Shun Liu , Luzheng Zhao , Haoyuan Zhu , Jiancong Guo , Zhongsheng Wen

Traditional metal sulfides used as anodes for sodium-ion batteries are hindered by sluggish kinetics, which limits their rate performance. Previous attempts to address this issue focused on nanostructured configurations with conductive frameworks. However, these nanomaterials often suffer from low packing density and the tendency for nanoparticles to agglomerate, posing significant challenges for practical applications. To overcome these limitations, this study presents a novel bimetal superionic anode material Cu_3.21Bi_4.79S₉, which effectively resolves the conflict between sluggish kinetics and micrometer-scale particle size. By leveraging the vacancies created by free Cu and Bi atoms, this material forms rapid migration channels during sodium insertion and extraction, significantly reducing the migration barriers for sodium ions. The development of micrometer-scale Cu_3.21Bi_4.79S₉ enables ultrafast charging-discharging capabilities, achieving a reversible capacity of 325.5 mAh g⁻¹ after 4000 cycles at a high rate of 45 C (15 A g⁻¹). This work marks a significant advancement in the field by offering a solution to the inherent trade-off between high capacity and rate performance in coarse-grained materials, reducing the need for reliance on nanostructured configurations for next-generation high-capacity anode materials.

用作钠离子电池阳极的传统金属硫化物因动力学缓慢而受到阻碍，从而限制了其速率性能。以往解决这一问题的尝试主要集中在具有导电框架的纳米结构配置上。然而，这些纳米材料往往存在堆积密度低和纳米颗粒容易团聚的问题，给实际应用带来了巨大挑战。为了克服这些局限性，本研究提出了一种新型双金属超离子阳极材料 Cu3.21Bi4.79S9，它有效地解决了缓慢的动力学和微米级粒度之间的矛盾。通过利用游离铜原子和铋原子产生的空位，这种材料在钠离子插入和提取过程中形成了快速迁移通道，大大降低了钠离子的迁移障碍。微米级 Cu3.21Bi4.79S9 的开发实现了超快充放电能力，在 45 C（15 A g-1）的高速率下循环 4000 次后，可逆容量达到 325.5 mAh g-1。这项工作标志着该领域的重大进展，它为粗粒度材料在高容量和速率性能之间的固有权衡提供了解决方案，减少了下一代高容量负极材料对纳米结构配置的依赖。

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引用次数: 0