Journal of Power Sources最新文献_第3页

Improved electrochemical performance of Li-ion pouch cells with boron nitride nanotube-coated separators 氮化硼纳米管涂层对锂离子袋电池电化学性能的改善

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-29 DOI: 10.1016/j.jpowsour.2024.235938

Jung-Hwan Jung , Numan Yanar , Min-Ji Yang , Syam Kandula , Dolly Yadav , Thomas You-Seok Kim , Jae-Hyun Shim , Seokgwang Doo , Jaewoo Kim

The performance of the Li-ion pouch cells can be greatly enhanced by using boron nitride nanotubes (BNNT) coated on the polyethylene (PE) separators. BNNT coated on the PE separators (BNNT-PE) apparently boost the ionic conductivity (IC) as high as ∼40.7 % at various temperature ranges (−10 °C–60 °C) as compared to Neat-PE due to faster Li-ion transport and wettability offered by BNNT coating on PE. As a result, Li-ion transport can be enhanced at the interface as well as on the entire surface of the separator. For the NCM523//graphite pouch cells designed with the reversible capacity of 464.0 mAh, at 10.0 C, Neat-PE shows capacity of only 27.1 mAh, while BNNT-PE shows 4.3 times higher capacity of 143.2 mAh at room temperature. As a result, the BNNT-PE pouch cells present superior C-rate performance and cycle retention at both room and the low temperature (−10 °C). In addition, the excellent thermal conductivity of BNNT and higher IC of the BNNT-PE can effectively reduce the surface temperature of a single pouch cell about 3–4% during cycling. Upon these properties, BNNT may provide explicit solutions, in a material aspect, for fast charging-discharging, and enhanced safety with fast heat dissipation for advanced LIBs.

将氮化硼纳米管（BNNT）包覆在聚乙烯（PE）隔膜上，可以大大提高锂离子袋电池的性能。与neet -PE相比，涂覆在PE隔膜上的BNNT （BNNT-PE）在不同温度范围（- 10°C - 60°C）下明显提高了离子电导率（IC），高达40.7%，这是由于BNNT涂层在PE上提供了更快的锂离子传输和润湿性。因此，锂离子的输运可以在界面以及整个分离器表面得到增强。对于可逆容量为464.0 mAh的NCM523//石墨袋电池，在10.0℃下，Neat-PE的容量仅为27.1 mAh，而BNNT-PE在室温下的容量为143.2 mAh，是其4.3倍。结果，BNNT-PE袋状电池在室温和低温（- 10°C）下均表现出优异的C率性能和循环保持性。此外，BNNT优异的导热性和BNNT- pe较高的IC可以有效降低单个袋状电池在循环过程中的表面温度约3-4%。基于这些特性，BNNT可以在材料方面为快速充放电提供明确的解决方案，并通过快速散热提高先进锂电池的安全性。

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引用次数: 0

MXene-supported 2D bimetallic chalcogenide electrocatalyst: Enhanced electrochemical seawater splitting mxene负载的二维双金属硫族化物电催化剂：增强电化学海水分裂

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-29 DOI: 10.1016/j.jpowsour.2024.235951

Jeffrey Joseph John Jeya Kamaraj, Acchutharaman Kunka Ravindran, Senthil Pandian Muthu, Ramasamy Perumalsamy

Hydrogen energy holds immense potential for revolutionizing modern energy technologies. Seawater electrolysis is a promising strategy for hydrogen production; however, the lack of effective electrodes limits its widespread application. Therefore, developing high-performance, cost-effective catalysts for water splitting is essential for sustainable energy conversion. In this context, we report a novel hybrid bimetallic selenide (CoMoSe₂) and MXene (Ti₃C₂T_x) electrocatalyst, which exhibits remarkable catalytic performance for seawater electrolysis. The CoMoSe₂@Ti₃C₂T_x electrocatalyst demonstrates outstanding catalytic capabilities, achieving overpotentials of 82 mV for hydrogen evolution reaction (HER) and 329 mV for oxygen evolution reaction (OER) at a current density of 10 mA cm⁻² in alkaline conditions. The Tafel slope values are 124 mV dec⁻¹ for hydrogen evolution and 69 mV dec⁻¹ for oxygen evolution, outperforming their individual components. The enhanced bifunctional catalytic performance of the hybrid catalyst is attributed to the synergistic effect of Mo atoms within the CoSe₂ crystal structure, which modifies the electronic structure and lowers the chemisorption energies of hydrogen and oxygen intermediates. The abundance of oxygen vacancies provides more reactive active sites and improves electrical conductivity. Additionally, the CoMoSe₂@Ti₃C₂T_x composite has demonstrated remarkable bifunctional electrocatalytic performance for seawater splitting, achieving 10 mA cm⁻² at overpotentials of 161 mV for HER and 354 mV for OER in alkaline seawater. The Volmer-Heyrovsky mechanism drives the remarkable long-term stability of the catalyst. This novel approach contributes to sustainable energy solutions by providing a fresh avenue for the development of effective catalysts to produce hydrogen from seawater.

氢能具有革新现代能源技术的巨大潜力。海水电解是一种很有前途的制氢方法；然而，缺乏有效的电极限制了它的广泛应用。因此，开发高性能、低成本的水分解催化剂是实现可持续能源转换的关键。在此背景下，我们报道了一种新型的双金属硒化物（CoMoSe2）和MXene （Ti3C2Tx）杂化电催化剂，该催化剂在海水电解中表现出优异的催化性能。CoMoSe2@Ti3C2Tx电催化剂表现出出色的催化能力，在碱性条件下，电流密度为10 mA cm⁻2时，析氢反应（HER）的过电位为82 mV，析氧反应（OER）的过电位为329 mV。Tafel斜率值为124 mV dec - 1（氢的发展）和69 mV dec - 1（氧的发展），超过了它们各自的组成部分。杂化催化剂双功能催化性能的增强是由于CoSe2晶体结构内Mo原子的协同作用，改变了电子结构，降低了氢和氧中间体的化学吸附能。丰富的氧空位提供了更多的活性位点，提高了电导率。此外，CoMoSe2@Ti3C2Tx复合材料在海水分裂中表现出了显著的双功能电催化性能，在碱性海水中，HER的过电位为161 mV， OER的过电位为354 mV，达到10 mA cm⁻2。Volmer-Heyrovsky机制驱动了催化剂显著的长期稳定性。这种新方法为开发从海水中产生氢的有效催化剂提供了一条新的途径，有助于实现可持续能源解决方案。

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引用次数: 0

Fluorine-doped carbon coating of LiFe0.5Mn0.5PO4 enabling high-rate and long-lifespan cathode for lithium-ion batteries 掺氟碳涂层 LiFe0.5Mn0.5PO4，实现锂离子电池的高倍率和长寿命正极

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235892

Hong Chen, Yuchen Wu, Hanyu Xu, Jiaqing Zhao, Ji Wang, Chaojie Ren, Chao Zhao, Ruizhi Yang

The limited electron and ionic conductivity, along with the sluggish kinetics caused by the Jahn-Teller effect of Mn³⁺, impose constraints on the electrochemical performance of LiFe_xMn_1-xPO₄. Herein, the surface of LiFe_0.5Mn_0.5PO₄ (LFMP) is modified with a F-doped carbon using the solvothermal and calcination methods. The incorporation of F-doped carbon coating, along with the formation of interfacial F-Li, F-Fe and F-Mn bonds between the carbon layer and LFMP nanoparticles, significantly mitigates charge transfer resistance, facilitates rapid electron transfer, as well as enhances Li⁺ diffusion kinetics. The LFMP@C-F2 cathode prepared in this study exhibits an unexceptionable capacity retention of 90.5 % after 300 cycles at a low rate of 0.2C and a capacity retention of 78.8 % over 1000 cycles at a high rate of 1C. When incorporated into the solid battery configuration (Li/PEO-LATP CSE/LFMP@C-F2), it exhibits an initial discharge specific capacity of 148 mAh g⁻¹ and maintains a capacity retention of 85.8 % after 60 cycles at 0.1C, thereby offering an innovative approach to enhance the performance of LFMP in terms of cycling stability and rate capacity in lithium-ion batteries, as well as to apply LFMP into solid-state lithium batteries.

有限的电子和离子传导性以及 Mn3+ 的 Jahn-Teller 效应导致的迟缓动力学限制了 LiFexMn1-xPO4 的电化学性能。在此，采用溶热法和煅烧法用掺杂 F 的碳修饰 LiFe0.5Mn0.5PO4（LFMP）的表面。掺杂 F 的碳涂层的加入，以及碳层与 LFMP 纳米颗粒之间形成的 F-Li、F-Fe 和 F-Mn 界面键，大大减轻了电荷转移阻力，促进了电子的快速转移，并增强了 Li+ 扩散动力学。本研究制备的 LFMP@C-F2 阴极在 0.2C 的低倍率条件下循环 300 次后的容量保持率为 90.5%，在 1C 的高倍率条件下循环 1000 次后的容量保持率为 78.8%。当将其纳入固态电池配置（Li/PEO-LATP CSE/LFMP@C-F2）时，它的初始放电比容量为 148 mAh g-1，在 0.1C 下循环 60 次后容量保持率为 85.8%，从而为提高 LFMP 在锂离子电池中的循环稳定性和速率容量性能，以及将 LFMP 应用于固态锂电池提供了一种创新方法。

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引用次数: 0

Self-floating Janus hydrovoltaics for sustainable electricity generation 自漂浮Janus水力发电可持续发电

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235934

Zheng Liu , Jinliang Xu , Ting Chen , Qingyuan Liu , Xinzhe Liu , Guohua Liu

Water is widely available in nature that attracts increasing interesting in simulating transpiration effect to induce the electricity. However, it faces great challenges in establishing continues moisture gradient rather than periodic wetting behaviors. Here, we propose a self-floating Janus generator containing the hydrophilic and hydrophobic regions to induce the continues electricity. The self-floating and hydrophilic behavior ensures a continuous water supply. The asymmetric Janus structure forms a distinct wet/dry interface to create a significant water gradient with evaporation equilibrium state. At wetting region, the electric double layer (EDL) is formed due to the interaction of water and carbon black particles. Attributed to the large water gradient and fast contact line evaporation, proton accumulates across the capillary front that induces a potential difference. As a result, the Janus generator achieves 0.46 V open circuit voltage lasting for 40 h. It also demonstrates the potential applications of Janus generator in power supply, moisture detection and sweat monitoring et al. The proposed Janus generators show great potential in ocean energy development and be of great significance to the sensing of rescue signals in the sea.

水在自然界中是广泛存在的，因此人们对模拟蒸腾效应诱导电的研究越来越感兴趣。然而，在建立连续的水分梯度而不是周期性的润湿行为方面面临着巨大的挑战。在这里，我们提出了一个自漂浮的Janus发电机包含亲水性和疏水性区域来诱导持续电。自浮和亲水性保证了连续的供水。不对称Janus结构形成了明显的干湿界面，形成了具有蒸发平衡状态的显著水梯度。在润湿区，由于水和炭黑粒子的相互作用，形成电双层（EDL）。由于大的水梯度和快速的接触线蒸发，质子在毛细锋上积累，引起电位差。结果表明，Janus发电机的开路电压可达0.46 V，持续40小时。这也证明了Janus发电机在电源、湿度检测和汗液监测等方面的潜在应用。所提出的Janus发电机在海洋能源开发方面具有很大的潜力，对海上救援信号的感知具有重要意义。

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引用次数: 0

Analysis of CO2 bubble growth detachment kinetics in direct methanol fuel cell flow channels 直接甲醇燃料电池流道中二氧化碳气泡生长脱离动力学分析

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235880

Yu Tong, Hongxiu Zhou, Zemu Tian, Junhao Zhu, Jingyu Zhu

CO₂ bubbles flow in the anode flow channel is an important issue in the commercialization process of direct methanol fuel cells (DMFC). A T-channel model is built in COMSOL using the phase field method to investigate the CO₂ bubbles flow at the anode side of the DMFC. The factors and mechanisms of single bubble detachment are discussed by analyzing the methanol inlet velocity (U_l), CO₂ inlet velocity (U_g), contact angle of the diffusion layer, and the Weber number during bubble detachment. The research findings indicate that increasing the liquid flow rate leads to the generation of smaller bubbles that detach more rapidly due to the increases of drag force (F_D) and the shear-life force (F_SL) to overcome the surface tension on the bubble. The CO₂ inlet velocity can promote the bubble detachment due to the increase in F_SL, but also leads to a larger detachment diameter. Compared to hydrophobic surfaces, hydrophilic surfaces are more conducive to bubble detachment and removal. In all case We (Weber number) is significantly less than 0.6, indicating that liquid momentum dominated the bubble detachment process. Once the ratio of the gas momentum to the liquid one is greater than 1, the bubble is hard to detach. The contour map of bubble flow patterns and the bubble detachment diameters distribute with the ratio of U_g/U_l can further indicate that the bubble detachment is connected with the ratio of U_g/U_l closely, which will have guiding significance for the selection of inlet velocity of DMFC.

阳极流道中的二氧化碳气泡流动是直接甲醇燃料电池（DMFC）商业化过程中的一个重要问题。在 COMSOL 中使用相场法建立了一个 T 型通道模型，以研究 DMFC 阳极侧的二氧化碳气泡流动。通过分析气泡分离过程中的甲醇入口速度 (Ul)、二氧化碳入口速度 (Ug)、扩散层接触角和韦伯数，讨论了单个气泡分离的因素和机制。研究结果表明，增加液体流速会导致产生更小的气泡，由于克服气泡表面张力的阻力（FD）和剪切力（FSL）的增加，气泡分离得更快。由于 FSL 的增加，二氧化碳入口速度可促进气泡分离，但也会导致分离直径变大。与疏水表面相比，亲水表面更有利于气泡的分离和去除。在所有情况下，We（韦伯数）都明显小于 0.6，表明液体动量在气泡分离过程中占主导地位。一旦气体动量与液体动量之比大于 1，气泡就很难脱离。气泡流态等值线图和气泡脱落直径随Ug/Ul比值的分布可以进一步说明气泡脱落与Ug/Ul比值关系密切，这对DMFC入口速度的选择具有指导意义。

{"title":"Analysis of CO2 bubble growth detachment kinetics in direct methanol fuel cell flow channels","authors":"Yu Tong, Hongxiu Zhou, Zemu Tian, Junhao Zhu, Jingyu Zhu","doi":"10.1016/j.jpowsour.2024.235880","DOIUrl":"10.1016/j.jpowsour.2024.235880","url":null,"abstract":"<div><div>CO<sub>2</sub> bubbles flow in the anode flow channel is an important issue in the commercialization process of direct methanol fuel cells (DMFC). A T-channel model is built in COMSOL using the phase field method to investigate the CO<sub>2</sub> bubbles flow at the anode side of the DMFC. The factors and mechanisms of single bubble detachment are discussed by analyzing the methanol inlet velocity (<em>U</em><sub>l</sub>), CO<sub>2</sub> inlet velocity (<em>U</em><sub>g</sub>), contact angle of the diffusion layer, and the Weber number during bubble detachment. The research findings indicate that increasing the liquid flow rate leads to the generation of smaller bubbles that detach more rapidly due to the increases of drag force (<em>F</em><sub>D</sub>) and the shear-life force (<em>F</em><sub>SL</sub>) to overcome the surface tension on the bubble. The CO<sub>2</sub> inlet velocity can promote the bubble detachment due to the increase in <em>F</em><sub>SL</sub>, but also leads to a larger detachment diameter. Compared to hydrophobic surfaces, hydrophilic surfaces are more conducive to bubble detachment and removal. In all case <em>We</em> (Weber number) is significantly less than 0.6, indicating that liquid momentum dominated the bubble detachment process. Once the ratio of the gas momentum to the liquid one is greater than 1, the bubble is hard to detach. The contour map of bubble flow patterns and the bubble detachment diameters distribute with the ratio of <em>U</em><sub>g</sub>/<em>U</em><sub>l</sub> can further indicate that the bubble detachment is connected with the ratio of <em>U</em><sub>g</sub>/<em>U</em><sub>l</sub> closely, which will have guiding significance for the selection of inlet velocity of DMFC.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"628 ","pages":"Article 235880"},"PeriodicalIF":8.1,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modifying buried interface via 6-aminonicotinic acid molecule dipolar layer for efficient and stable inorganic perovskite solar cells 利用6-氨基烟酸分子偶极层修饰埋藏界面制备高效稳定的无机钙钛矿太阳能电池

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235943

Jiayu Bi , Hanqing Liu , Dongsheng Wang, Fanning Meng, Guiqiang Wang

The buried electron-transport layer (ETL)/perovskite interface not only influences the interface charge transport but also directly affects the perovskite crystallization, and thereby is crucial for the efficiency promotion of inorganic CsPbX₃ perovskite solar cells (PSCs). Herein, 6-aminonicotinic acid (ANA) molecule is employed to modify the buried TiO₂ ETL/CsPbIBr₂ perovskite interface through forming a molecule dipolar layer. The formation of ANA molecule dipolar layer passivates the defects at the buried TiO₂ ETL/CsPbIBr₂ perovskite interface, ameliorates the interface contact, and optimizes the interface energy level alignment, which considerably enhances the electron extraction and transport at the buried interface. Meanwhile, the buried interface modified by ANA molecule dipolar layer facilitates fabricating the high-quality CsPbIBr₂ perovskite film. Benefiting from the above favorable features, the assembled carbon-based CsPbIBr₂ PSC achieves a power conversion efficiency of 10.98 %, which is among the highest efficiency of carbon-based CsPbIBr₂ devices reported previously. In addition, the construction of ANA molecule dipolar layer at the buried interface notably enhances the stability of CsPbIBr₂ perovskite and fabricated PSCs. Under ambient conditions, the unencapsulated CsPbIBr₂ device with ANA molecule dipolar layer maintains 90.1 % of its original efficiency after 45-day storage.

埋藏电子输运层(ETL)/钙钛矿界面不仅影响界面电荷输运，而且直接影响钙钛矿的结晶，因此对无机CsPbX3钙钛矿太阳能电池（PSCs）的效率提升至关重要。本文利用6-氨基烟酸（ANA）分子对埋藏的TiO2 ETL/CsPbIBr2钙钛矿界面进行修饰，形成分子偶极层。ANA分子偶极层的形成钝化了埋藏TiO2 ETL/CsPbIBr2钙钛矿界面处的缺陷，改善了界面接触，优化了界面能级排列，显著增强了埋藏界面处的电子提取和输运。同时，ANA分子偶极层修饰的埋藏界面有利于制备高质量的CsPbIBr2钙钛矿膜。得益于以上优点，组装的碳基CsPbIBr2 PSC实现了10.98%的功率转换效率，是此前报道的碳基CsPbIBr2器件效率最高的器件之一。此外，埋藏界面处ANA分子偶极层的构建显著增强了CsPbIBr2钙钛矿和制备的psc的稳定性。在环境条件下，具有ANA分子偶极层的未封装CsPbIBr2器件在储存45天后仍保持其原始效率的90.1%。

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引用次数: 0

Value-added recycling of spent LiFePO4 by a FeCl3 leaching-spray pyrolysis approach 废LiFePO4的FeCl3浸出-喷雾热解法增值回收

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235939

Zhao Zhao, Yan Li, Ziyu Chen, Chengzong Li, Haibin Zeng, Chengming Du, Tao Li

Traditional recycling technologies for spent lithium iron phosphate (LiFePO₄, LFP) usually suffer from issues such as complex procedures, heavy chemical consumption, and limited economic viability. Herein, we propose a method combining FeCl₃ leaching and spray pyrolysis for the high-value-added recycling of spent LFP. Using FeCl₃ as leaching agent, over 99 % of Li is selectively leached out within 30 min with a solid-liquid ratio up to 300 g L⁻¹. The resulting leaching residue (FePO₄) serves as a precursor for the synthesis of new LFP. Subsequently, the Li and Fe-containing leachate undergoes a spray pyrolysis process, yielding a pyrolysis powder comprising LiCl and Fe₂O₃. Through a water-leaching procedure, the separation of LiCl and Fe₂O₃ is achieved based on their distinct solubility in water. The resulting high-purity LiCl solution and Fe₂O₃ residue are directly utilizable for producing battery-grade Li₂CO₃ and LFP cathodes, respectively. LFP/C cathodes, synthesized using the recovered Li₂CO₃ and FePO₄ precursor, exhibit an impressive 99.8 % capacity retention after 200 cycles at a 1C rate. This method holds great economic and environmental benefits by producing high-value-added products while avoiding the consumption of acids or alkalis.

传统的废磷酸铁锂（LiFePO4， LFP）回收技术通常存在程序复杂、化学品消耗大、经济可行性有限等问题。本文提出了一种将FeCl3浸出与喷雾热解相结合的废LFP高附加值回收方法。以FeCl3为浸出剂，30 min内可选择性浸出99%以上的锂，料液比可达300 g L−1。所得的浸出渣（FePO4）可作为合成新LFP的前体。随后，含Li和fe的渗滤液进行喷雾热解过程，得到由LiCl和Fe2O3组成的热解粉。通过水浸过程，基于LiCl和Fe2O3在水中的独特溶解度，实现了它们的分离。所得的高纯度LiCl溶液和Fe2O3残渣分别可直接用于生产电池级Li2CO3和LFP阴极。使用回收的Li2CO3和FePO4前驱体合成的LFP/C阴极，在1C速率下循环200次后显示出令人印象深刻的99.8%的容量保持率。这种方法在生产高附加值产品的同时避免了酸或碱的消耗，具有很大的经济效益和环境效益。

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引用次数: 0

Iron complex with multiple negative charges ligand for ultrahigh stability and high energy density alkaline all-iron flow battery 用于超高稳定性和高能量密度碱性全铁液流电池的带有多个负电荷配体的铁络合物

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235947

Shuangyan Gui , Hua Jiang , Wendong Yang , Linfeng Wang , Pei Liu , Jintao Meng , Xue Long , Xuan Cai , Yilin Zeng , Yifan Zhang , Jinhua Guo , Jun Wang , Jun Zhou , Jiangjiang Duan

Alkaline all-iron flow batteries (AIFBs) are highly attractive for large-scale and long-term energy storage due to the abundant availability of raw materials, low cost, inherent safety, and decoupling of capacity and power. However, a stable iron anolyte is still being explored to address complex decomposition, ligand crossover, and energy density to improve battery performance. Herein, a promising metal-organic complex, Fe(NTHPS), consisting of FeCl₃ and 3,3′,3″-nitrilotris (2-hydroxypropane-1-sulfonate) (NTHPS), is specifically designed for alkaline all-iron flow battery. The NTHPS exhibits strong binding strength with iron ions, resulting in ultrahigh stability during the charge-discharge process. AIFB based on the [Fe(CN)₆]^4- catholyte and Fe(NTHPS) showcases an exceptionally high capacity retention of 97.8 % after 2000 cycles (0.0011 % per cycle), maintaining high coulombic efficiency near 100 %. Furthermore, with a solubility as high as 1.82 mol⁻¹, the Fe(NTHPS) anolyte demonstrates an ultra-high theoretical capacity of 47.23 Ah L⁻¹. This multiple negative charges ligand not only resolves existing barrier associated with AIFBs, but also provides valuable insight for their commercial application.

碱性全铁液流电池（AIFB）具有原材料丰富、成本低廉、固有安全性高以及容量与功率解耦等优点，对大规模和长期储能具有极大的吸引力。然而，人们仍在探索一种稳定的铁电解质，以解决复杂的分解、配体交叉和能量密度等问题，从而提高电池性能。本文专门为碱性全铁液流电池设计了一种很有前景的金属有机复合物--Fe(NTHPS)，由FeCl3和3,3′,3″-nitrilotris (2-hydroxypropane-1-sulfonate) (NTHPS)组成。NTHPS 与铁离子的结合力很强，因此在充放电过程中具有超高的稳定性。基于[Fe(CN)6]4-电解质和 Fe(NTHPS)的全铁液流电池经过 2000 次循环（每次循环 0.0011%）后，容量保持率高达 97.8%，库仑效率接近 100%。此外，Fe(NTHPS) anolyte 的溶解度高达 1.82 mol-1，显示出 47.23 Ah L-1 的超高理论容量。这种多重负电荷配体不仅解决了与 AIFB 相关的现有障碍，还为其商业应用提供了宝贵的见解。

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引用次数: 0

Regulation strategy of preparation methods for new spherical La-Y-Ni hydrogen storage alloy with ultra-long cycle lives 超长循环寿命新型球形La-Y-Ni贮氢合金制备方法的调控策略

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235928

Shujuan Zhou , Li Wang , Baoquan Li , Xiangyang He , Xu Zhang , Jin Xu , Yuyuan Zhao , Huizhong Yan

La-Y-Ni-based alloys are high-performance superlattice rare-earth H2-storage electrode materials. However, their complex phase structural evolution results in poor electrochemical cycle lives. In this study, a gas atomization method develops to obtain spherical La-Y-Ni-based hydrogen storage alloys with high structural stability. The spherical La-Y-Ni powder exhibits a narrow particle size distribution between 30 and 75 μm and capacity retention over 60 % for 600 cycles. A three-dimensional particle insertion strain model and finite element simulations reveal the direct effects of the particle morphology on the stress distribution during hydrogen embedding. The spherical powder exhibits a uniform strain, good mechanical properties, and resistance against pulverization and damage. The new preparation strategy for spherical powders prominently regulates the [A₂B₄] subunit, decreasing the subunit mismatch and lattice strain, and improving the structural stability during the hydrogen absorption/desorption. In addition, the morphology regulation, phase composition controllability, platform characteristics and electrochemical properties investigate by comparing the use of gas atomization, casting, and rapid quenching. This study provides a new direction for developing high-performance spherical electrode materials.

la - y - ni基合金是一种高性能超晶格稀土h2存储电极材料。但其复杂的相结构演变导致其电化学循环寿命较差。本研究采用气体雾化方法制备了结构稳定的球形la - y - ni基储氢合金。球形La-Y-Ni粉末粒径分布在30 ~ 75 μm之间，循环600次后容量保持率超过60%。三维颗粒嵌入应变模型和有限元模拟揭示了颗粒形态对埋氢过程应力分布的直接影响。球形粉末具有应变均匀、力学性能好、抗粉碎、抗损伤等特点。新的球形粉末制备策略显著调节了[A2B4]亚基，减少了亚基失配和晶格应变，提高了吸氢/解吸过程中的结构稳定性。此外，通过气雾化、铸造和快速淬火的对比，研究了合金的形貌调控、相组成可控性、平台特性和电化学性能。该研究为开发高性能球形电极材料提供了新的方向。

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引用次数: 0

Anion exchange membrane electrolysis at work—Investigating impact of starting parameters and start–stop operation on cold start behavior and degradation 阴离子交换膜电解工作——研究启动参数和启停操作对冷启动行为和降解的影响

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-28 DOI: 10.1016/j.jpowsour.2024.235878

August Gladik , Marc Riedel , Rüdiger-A. Eichel

Water electrolysis is a key technology for the production of green hydrogen, with anion exchange membrane water electrolysis (AEMWE) showing promising properties. Future energy systems will require transient electrolysis operation to combine electrolysis with fluctuating renewably generated power. This study examines and optimizes the cold start process (from ambient temperature and 0 V stack voltage) of an AEMWE stack system in terms of starting time, energy demand and degradation. The influence of relevant parameters such as voltage slope, target voltage, downtime and heating strategy on the starting process is experimentally quantified. A temporary increase in cell voltage during the starting process thereby represents a suitable compromise between acceleration of the startup and maintaining a low degradation. In addition, the start–stop degradation analysis with 150 cold starts per parameter set reveals that the degradation of the AEMWE stack during the starting process is independent of the maximum cell voltage and instead correlates with the steepness of the current slope. Using electrochemical impedance spectroscopy, the degradation is assigned to electrode processes. Under moderate starting conditions, degradation rates of 2–10

μ

V start⁻¹ are observed. This shows that AEMWE is highly compatible with regular operational interruptions.

水电解是绿色制氢的关键技术，阴离子交换膜水电解（AEMWE）具有良好的应用前景。未来的能源系统将需要瞬态电解操作，将电解与波动的可再生能源相结合。本研究从启动时间、能量需求和退化方面考察并优化了AEMWE堆叠系统的冷启动过程（从环境温度和0 V堆叠电压开始）。实验量化了电压斜率、目标电压、停机时间和加热策略等相关参数对启动过程的影响。因此，在启动过程中，电池电压的暂时增加代表了加速启动和保持低退化之间的适当折衷。此外，每个参数集有150次冷启动时的启停退化分析表明，启动过程中AEMWE堆栈的退化与最大电池电压无关，而是与电流斜率的陡峭度相关。利用电化学阻抗谱，降解被分配到电极过程。在中等启动条件下，观察到2-10 μV启动−1的降解率。这表明AEMWE与常规操作中断高度兼容。

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引用次数: 0