Journal of Energy Chemistry最新文献_第2页

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

Efficient and stable hydrogen evolution and antibiotic degradation in all-pH-scale water/alkaline seawater using Fe-Co phosphide hollow nanocages fabricated from metallurgical solid waste 利用冶金固体废弃物制备的磷化铁-钴空心纳米笼在全 PH 级水/碱性海水中实现高效稳定的氢进化和抗生素降解

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.064

Zekun Zhao , Suqin Li , Yongkui Li , Qingqing Xia , Haiping Lei , Hao Zhang , Shuqiang Jiao

The utilization of seawater, a plentiful and cost-effective resource, instead of freshwater for H₂ production through electrolysis has garnered significant attention. Herein, we present the synthesis of open-structured Fe-Co phosphide (FCP) nanocages for the overall seawater electrolysis, employing metallurgical solid waste (steel rolling sludge, SRS) as the precursor material. The FCP nanocages demonstrate exceptional catalytic activity for the hydrogen evolution reaction (HER) in all pH scales, achieving performance comparable to that of Pt/C catalysts at high current densities. The electrolyzer assembled with FCP||FCP requires 1.57 and 1.68 V to achieve current densities of 10 and 100 mA cm⁻², respectively. Furthermore, the assembled FCP electrolyzer showcases over 100 h of cycling stability and nearly 100% Faradaic efficiency. Crucially, it can be powered by commercially available silicon solar panels, operating under an intensity of 100 mW cm⁻², and by wind-driven sources, rendering it highly promising for real-world applications. The seawater hydrogen evolution system coupled with levofloxacin (LEV) degradation was constructed for the first time. The oxidation potential of LEV oxidation reaction (LEVOR) was significantly lower than that of oxygen evolution reaction (OER), indicating that the LEV degradation reaction occurred preferentially and achieved a removal efficiency of 98.57% within 60 min. This study provides effective strategies for valorizing SRS and offers insights into the fabrication of high-performance catalysts.

海水资源丰富且成本低廉，利用海水代替淡水进行电解生产 H2 已引起广泛关注。在此，我们以冶金固体废弃物（轧钢污泥，SRS）为前驱体材料，合成了用于整体海水电解的开放结构磷化铁-钴（FCP）纳米笼。FCP 纳米电容器在所有 pH 值范围内对氢进化反应（HER）都表现出卓越的催化活性，在高电流密度下可达到与 Pt/C 催化剂相媲美的性能。使用 FCP||FCP 组装的电解槽分别需要 1.57 和 1.68 V 的电压才能达到 10 和 100 mA cm-2 的电流密度。此外，组装后的 FCP 电解槽具有超过 100 小时的循环稳定性和近 100% 的法拉第效率。最重要的是，它可以使用市售的硅太阳能电池板（工作强度为 100 mW cm-2）和风力资源供电，因此在实际应用中大有可为。首次构建了结合左氧氟沙星（LEV）降解的海水氢进化系统。左氧氟沙星氧化反应（LEVOR）的氧化电位明显低于氧进化反应（OER）的氧化电位，表明左氧氟沙星降解反应优先发生，并在 60 分钟内实现了 98.57% 的去除效率。这项研究为 SRS 的增值提供了有效策略，并为高性能催化剂的制造提供了启示。

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引用次数: 0

Electronic interactions between neighboring functionalized guest Sb single atoms and Pt clusters enhance CO tolerance 相邻功能化客体锑单原子与铂团簇之间的电子相互作用增强了对一氧化碳的耐受性

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.013

Wenkang Miao , Ronghui Hao , Lu Gan , Wanyin Xu , Zihan Wang , Wenxin Lin , Heguang Liu , Yinchun Lyu , Qianqian Li , Jinyang Xi , Anmin Nie , Jinsong Wu , Hongtao Wang

Platinum-based (Pt) catalysts are notoriously susceptible to deactivation in industrial chemical processes due to carbon monoxide (CO) poisoning. Overcoming this poisoning deactivation of Pt-based catalysts while enhancing their catalytic activity, selectivity, and durability remains a major challenge. Herein, we propose a strategy to enhance the CO tolerance of Pt clusters (Pt_n) by introducing neighboring functionalized guest single atoms (such as Fe, Co, Ni, Cu, Sb, and Bi). Among them, antimony (Sb) single atoms (SAs) exhibit significant performance enhancement, achieving 99% CO selectivity and 33.6% CO₂ conversion at 450 °C. Experimental results and density functional theory (DFT) calculations indicate the optimization arises from the electronic interaction between neighboring functionalized Sb SAs and Pt clusters, leading to optimal 5d electron redistribution in Pt clusters compared to other functionalized guest single atoms. The redistribution of 5d electrons weaken both the σ donation and π backdonation interactions, resulting in a weakened bond strength with CO and enhancing catalyst activity and selectivity. In situ environmental transmission electron microscopy (ETEM) further demonstrates the exception thermal stability of the catalyst, even under H₂ at 700 °C. Notably, the functionalized Sb SAs also improve CO tolerance in various heterogenous catalysts, including Co/CeO₂, Ni/CeO₂, Pt/Al₂O₃, and Pt/CeO₂-C. This finding provides an effective approach to overcome the primary challenge of CO poisoning in Pt-based catalysts, making their broader applications in various industrial catalysts.

在工业化学过程中，铂基（Pt）催化剂很容易因一氧化碳（CO）中毒而失活。克服铂基催化剂的这种中毒失活现象，同时提高其催化活性、选择性和耐久性，仍然是一项重大挑战。在此，我们提出了一种策略，通过引入邻近的功能化客体单原子（如铁、钴、镍、铜、锑和铋）来增强铂簇（Ptn）对 CO 的耐受性。其中，锑（Sb）单原子（SAs）表现出显著的性能提升，在 450 °C 时实现了 99% 的 CO 选择性和 33.6% 的 CO2 转化率。实验结果和密度泛函理论（DFT）计算表明，与其他功能化客体单原子相比，这种优化来自于相邻功能化锑单原子和铂团簇之间的电子相互作用，导致铂团簇中的 5d 电子重新分布达到最佳状态。5d 电子的重新分布削弱了 σ 捐献和 π 反拨相互作用，从而削弱了与 CO 的键强度，提高了催化剂的活性和选择性。原位环境透射电子显微镜（ETEM）进一步证明了催化剂的超强热稳定性，即使在 700 °C 下的 H2 条件下也是如此。值得注意的是，官能化 Sb SA 还提高了各种异质催化剂（包括 Co/CeO2、Ni/CeO2、Pt/Al2O3 和 Pt/CeO2-C）对 CO 的耐受性。这一发现为克服铂基催化剂中 CO 中毒这一主要难题提供了有效方法，使其在各种工业催化剂中得到更广泛的应用。

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引用次数: 0

Effective stress dissipation by multi-dimensional architecture engineering for ultrafast and ultralong sodium storage 通过多维结构工程有效消散应力，实现超快和超长钠储存

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.008

Man Zhang , Jing Zhu , Qianqian Li , Fenghua Zheng , Sijiang Hu , Youguo Huang , Hongqiang Wang , Xing Ou , Qichang Pan , Qingyu Li

Stress accumulation is a key factor leading to sodium storage performance deterioration for NiSe₂-based anodes. Therefore, inhibiting the concentrated local stress during the sodiataion/desodiation process is crucial for acquiring stable NiSe₂-based materials for sodium-ion batteries (SIBs). Herein, a stress dissipation strategy driven by architecture engineering is proposed, which can achieve ultrafast and ultralong sodium storage properties. Different from the conventional sphere-like or rod-like architecture, the three-dimensional (3D) flower-like NiSe₂@C composite is delicately designed and assembled with one-dimensional nanorods and carbon framework. More importantly, the fundamental mechanism of improved structure stability is unveiled by simulations and experimental results simultaneously. It demonstrates that this designed multidimensional flower-like architecture with dispersed nanorods can balance the structural mismatch, avoid concentrated local strain, and relax the internal stress, mainly induced by the unavoidable volume variation during the repeated conversion processes. Moreover, it can provide more Na⁺-storage sites and multi-directional migration pathways, leading to a fast Na⁺-migration channel with boosted reaction kinetic. As expected, it delivers superior rate performance (441 mA h g⁻¹ at 5.0 A g⁻¹) and long cycling stability (563 mA h g⁻¹ at 1.0 A g⁻¹ over 1000 cycles) for SIBs. This work provides useful insights for designing high-performance conversion-based anode materials for SIBs.

应力累积是导致基于 NiSe2 的阳极储钠性能下降的关键因素。因此，在钠离子电池（SIB）的钠硒基材料中，抑制钠硒基阳极在钠化/解钠过程中的局部应力集中至关重要。本文提出了一种由结构工程驱动的应力消散策略，可实现超快和超长的钠存储特性。与传统的球状或棒状结构不同，三维（3D）花朵状 NiSe2@C 复合材料经过精心设计，并与一维纳米棒和碳框架组装在一起。更重要的是，模拟和实验结果同时揭示了提高结构稳定性的基本机制。实验结果表明，这种带有分散纳米棒的多维花状结构设计可以平衡结构失配，避免局部应变集中，并放松内应力，内应力主要是由反复转换过程中不可避免的体积变化引起的。此外，它还能提供更多的 Na+ 储存位点和多向迁移途径，从而形成快速的 Na+ 迁移通道，并提高反应动力学。正如预期的那样，它为 SIB 提供了卓越的速率性能（5.0 A g-1 时为 441 mA h g-1）和长期循环稳定性（1.0 A g-1 时为 563 mA h g-1，循环 1000 次）。这项工作为设计用于 SIB 的高性能转换型阳极材料提供了有益的启示。

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引用次数: 0

Quantification of solvent-mediated host-ion interaction in graphite intercalation compounds for extreme-condition Li-ion batteries 量化极端条件下锂离子电池石墨插层化合物中溶剂介导的宿主离子相互作用

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.014

Jia-Zhen Zhao , Fu-Da Yu , Ji-Huai Wu , Zhang Lan , Yi-Ming Xie , Le-Qing Fan , Lan-Fang Que , Zhen-Bo Wang

Achieving simultaneous fast-charging capabilities and low-temperature adaptability in graphite-based lithium-ion batteries (LIBs) with an acceptable cycle life remains challenging. Herein, an ether-based electrolyte with temperature-adaptive Li⁺ solvation structure is designed for graphite, and stable Li⁺/solvent co-intercalation has been achieved at subzero. As revealed by in-situ variable temperature (−20 °C) X-ray diffraction (XRD), the poor compatibility of graphite in ether-based electrolyte at 25 °C is mainly due to the continuous electrolyte decomposition and the in-plane rearrangement below 0.5 V. Former results in a significant irreversible capacity, while latter maintains graphite in a prolonged state of extreme expansion, ultimately leading to its exfoliation and failure. In contrast, low temperature triggers the rearrangement of Li⁺ solvation structure with stronger Li⁺/solvent binding energy and shorter Li⁺–O bond length, which is conducive for reversible Li⁺/solvent co-intercalation and reducing the time of graphite in an extreme expansion state. In addition, the co-intercalation of solvents minimizes the interaction between Li-ions and host graphite, endowing graphite with fast diffusion kinetics. As expected, the graphite anode delivers about 84% of the capacity at room temperature at −20 °C. Moreover, within 6 min, about 83%, 73%, and 43% of the capacity could be charged at 25, −20, and −40 °C, respectively.

在石墨基锂离子电池（LIB）中同时实现快速充电能力和低温适应性，并达到可接受的循环寿命，仍然是一项挑战。在此，我们为石墨设计了一种具有温度适应性 Li+ 溶胶结构的醚基电解质，并在零度以下实现了稳定的 Li+ / 溶剂共掺合。原位变温（-20 °C）X 射线衍射（XRD）显示，石墨在 25 °C醚基电解质中的相容性较差，主要是由于电解质在 0.5 V 以下的持续分解和面内重排。前者会导致大量不可逆容量，后者会使石墨长期处于极度膨胀状态，最终导致石墨剥落和失效。相反，低温会引发 Li+ 溶解结构的重新排列，使 Li+ 与溶剂的结合能增强，Li+-O 键长度缩短，有利于 Li+ 与溶剂的可逆共掺杂，缩短石墨处于极度膨胀状态的时间。此外，溶剂的共掺杂将锂离子与寄主石墨之间的相互作用降至最低，使石墨具有快速扩散动力学。正如预期的那样，石墨阳极在-20 °C的室温下可提供约84%的容量。此外，在 25 ℃、-20 ℃ 和 -40 ℃ 下，6 分钟内可分别充入约 83%、73% 和 43% 的容量。

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引用次数: 0

Electronic modulation towards MOFs as template derived CoP via engineered heteroatom defect for a highly efficient overall water splitting 通过设计杂原子缺陷对作为模板衍生 CoP 的 MOFs 进行电子调制，实现高效整体水分离

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.10.010

Meijie Ding , Zhiqiang Wei , Dexue Liu , Wenhua Zhao , Qiang Lu , Zhiming Li , Qingsong Yu , Chenggong Lu , Hua Yang

The reasonable design of material morphology and eco-friendly electrocatalysts are essential to highly efficient water splitting. It is proposed that a promising strategy effectively regulates the electronic structure of the d‐orbitals of CoP using cerium doping in this paper, thus significantly improving the intrinsic property and conductivity of CoP for water splitting. As a result, the as-synthesize porous Ce-doped CoP micro-polyhedron composite derived from Ce-ZIF-67 as bifunctional electrocatalytic materials exhibits excellent electrocatalytic performance in both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), overpotentials of about 152 mV for HER at 10 mA cm⁻² and about 352 mV for OER at 50 mA cm⁻², and especially it shows outstanding long-term stability. Besides, an alkaline electrolyzer, using Ce_0.04Co_0.96P electrocatalyst as both the anode and cathode, delivers a cell voltage value of 1.55 V at the current density of 10 mA cm⁻². The calculation results of the density functional theory (DFT) demonstrate that the introduction of an appropriate amount of Ce into CoP can enhance the conductivity, and can induce the electronic modulation to regulate the selective adsorption of reaction intermediates on catalytic surface and the formation of O* intermediates (CoOOH), which exhibits an excellent electrocatalytic performance. This study provides novel insights into the design of an extraordinary performance water-splitting of the multicomponent electrocatalysts.

合理的材料形态设计和环保型电催化剂是高效水分离的关键。本文提出了一种可行的策略，即利用铈掺杂有效调节 CoP 的 d 轨道电子结构，从而显著改善 CoP 的本征性能和电导率，以实现水的分离。因此，以 Ce-ZIF-67 为原料合成的多孔掺铈 CoP 微多面体复合材料作为双功能电催化材料，在氧进化反应（OER）和氢进化反应（HER）中均表现出优异的电催化性能，在 10 mA cm-2 的条件下，HER 的过电位约为 152 mV，在 50 mA cm-2 的条件下，OER 的过电位约为 352 mV，尤其是它表现出突出的长期稳定性。此外，使用 Ce0.04Co0.96P 电催化剂作为阳极和阴极的碱性电解槽在 10 mA cm-2 的电流密度下可产生 1.55 V 的电池电压值。密度泛函理论（DFT）的计算结果表明，在 CoP 中引入适量的 Ce 可以提高电导率，并能诱导电子调制调节反应中间产物在催化表面的选择性吸附和 O* 中间产物（CoOOH）的形成，从而表现出优异的电催化性能。这项研究为设计性能优异的多组分电催化剂分水器提供了新的见解。

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引用次数: 0

Tailoring BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3−δ electrolyte through strategic Cu doping for low temperature proton conducting fuel cells: Envisioned theoretically and experimentally 通过策略性掺铜为低温质子传导燃料电池定制 BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3-δ电解质：理论和实验设想

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.067

Zaheer Ud Din Babar , Muhammad Bilal Hanif , Yan’an Li , Wan-Ting Wang , Hanchen Tian , Cheng-Xin Li

This study addresses the challenge of high sintering temperatures in proton-conducting fuel cells (PCFCs) with BaCeO₃-doped electrolytes. We demonstrate that 1 mol% copper (Cu) doping at the B-site of BaCe_0.7Zr_0.1(Dy_0.1|Yb_0.1)_0.2O₃₋_δ (BCZDYb) improves sintering behavior, enabling densification at 1400 °C. However, Cu doping disrupts stoichiometry, creating barium vacancies and reducing proton-accepting cations, affecting overall conductivity. This mechanism is confirmed through density functional theory (DFT) calculations and various experimental techniques, including crystal structure analysis using X-ray diffraction (XRD) and morphology and elemental analysis via field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS). Electrochemical measurements are performed using the electrochemical impedance spectroscopy (EIS). The ionic conductivity of 1 mol% Cu-doped BCZDYb (BCZDYb-1) is 1.49 × 10⁻² S cm⁻¹ at 650 °C, which is ∼3.58 times higher than that of BCZDYb sintered at 1200 °C. The BCZDYb-1 exhibits ∼16 times higher grain boundary conductivity when sintered at 1400 °C, compared to undoped BCZDYb. The single cell employing BCZDYb-1 as the electrolyte achieved a power density of ∼606 mW cm⁻² at 550 °C. These results indicate that a controlled amount of Cu doping can enhance densification while maintaining high ionic conductivity, making it suitable for practical applications in PCFCs operating at lower temperatures.

本研究解决了质子传导燃料电池 (PCFC) 中掺杂 BaCeO3 电解质的高烧结温度难题。我们证明，在 BaCe0.7Zr0.1(Dy0.1|Yb0.1)0.2O3-δ（BCZDYb）的 B 位掺杂 1 摩尔% 的铜（Cu）可改善烧结行为，使其在 1400 ℃ 下实现致密化。然而，掺杂铜会破坏化学计量，产生钡空位并减少质子接受阳离子，从而影响整体导电性。通过密度泛函理论（DFT）计算和各种实验技术，包括利用 X 射线衍射（XRD）进行晶体结构分析，以及通过场发射扫描电子显微镜（FESEM）和能量色散 X 射线光谱（EDS）进行形貌和元素分析，证实了这一机制。电化学测量采用电化学阻抗光谱法（EIS）进行。在 650 °C 时，掺杂 1 mol% Cu 的 BCZDYb（BCZDYb-1）的离子电导率为 1.49 × 10-2 S cm-1，是在 1200 °C 下烧结的 BCZDYb 的 3.58 倍。与未掺杂的 BCZDYb 相比，BCZDYb-1 在 1400 ℃ 烧结时的晶界电导率高出 16 倍。采用 BCZDYb-1 作为电解质的单电池在 550 ℃ 时的功率密度达到了 ∼606 mW cm-2。这些结果表明，可控的铜掺杂量可在保持高离子导电性的同时提高致密性，使其适用于在较低温度下工作的 PCFC 中的实际应用。

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引用次数: 0

Selenate oxyanion-intercalated NiFeOOH for stable water oxidation via lattice oxygen oxidation mechanism 通过晶格氧氧化机制实现稳定水氧化的硒氧阴离子互掺 NiFeOOH

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.066

Yijie Zhang , Weiyi Zhang , Xiaowen Zhang , Jinping Li , Guang Liu

Transition metal-based compounds can serve as pre-catalysts to obtain genuine oxygen evolution reaction (OER) electrocatalysts in the form of oxyhydroxides through electrochemical activation. However, the role and existence form of leached oxygen anions are still controversial. Herein, we selected iron selenite-wrapped hydrated nickel molybdate (denoted as NiMoO/FeSeO) as a pre-catalyst to study the oxyanion effect. It is surprising to find that SeO₄²⁻ exists in the catalyst in the form of intercalation, which is different from previous studies that suggest that anions are doped with residual elements after electrochemical activation, or adsorbed on the catalyst surface. The experiment and theoretical calculations show that the existence of SeO₄²⁻ intercalation effectively adjusts the electronic structure of NiFeOOH, promotes intramolecular electron transfer and O–O release, and thus lowers the reaction energy barrier. As expected, the synthesized NiFeOOH-SeO only needs 202 and 285 mV to attain 100 and 1000 mA cm⁻² in 1 M KOH. Further, the anion exchange membrane water electrolyzer (AEMWE) consisting of NiFeOOH-SeO anode and Pt/C cathode can reach 1 A cm⁻² at 1.70 V and no significant attenuation within 300 h. Our findings provide insights into the mechanism, by which the intercalated oxyanions enhance the OER performance of NiFeOOH, thereby facilitating large-scale hydrogen production through AEMWE.

过渡金属基化合物可作为前催化剂，通过电化学活化以氧氢氧化物的形式获得真正的氧进化反应（OER）电催化剂。然而，浸出氧阴离子的作用和存在形式仍存在争议。在此，我们选择了硒酸铁包裹的水合钼酸镍（记为 NiMoO/FeSeO）作为前催化剂来研究氧阴离子效应。令人惊讶的是，SeO42- 以插层形式存在于催化剂中，这与以往研究认为阴离子是在电化学活化后掺入残余元素或吸附在催化剂表面的观点不同。实验和理论计算表明，SeO42-插层的存在有效地调整了 NiFeOOH 的电子结构，促进了分子内电子转移和 O-O 释放，从而降低了反应能垒。正如预期的那样，在 1 M KOH 中，合成的 NiFeOOH-SeO 只需要 202 和 285 mV 就能达到 100 和 1000 mA cm-2。此外，由 NiFeOOH-SeO 阳极和 Pt/C 阴极组成的阴离子交换膜水电解槽（AEMWE）可在 1.70 V 的电压下达到 1 A cm-2，且在 300 小时内无明显衰减。我们的研究结果深入揭示了插层氧阴离子提高 NiFeOOH 的 OER 性能的机制，从而促进了通过 AEMWE 大规模制氢。

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引用次数: 0

Enhanced dynamics of Al3+/H+ ions in aqueous aluminum ion batteries: Construction of metastable structures in vanadium pentoxide upon oxygen vacancies 水性铝离子电池中 Al3+/H+ 离子的动力学增强：氧空位在五氧化二钒中构建可迁移结构

IF 13.1 1区化学 Q1 Energy

Journal of Energy Chemistry

Pub Date : 2024-10-22 DOI: 10.1016/j.jechem.2024.09.062

Zhibao Wang, Hanqing Gu, Tianci Wu, Wenming Zhang, Zhanyu Li

In recent years, aqueous aluminum ion batteries have been widely studied owing to their abundant energy storage and high theoretical capacity. An in-depth study of vanadium oxide materials is necessary to address the precipitation of insoluble products covered cathode surface and the slow reaction kinetics. Therefore, a method using a simple one-step hydrothermal preparation and oxalic acid to regulate oxygen vacancies has been reported. A high starting capacity (400 mAh g⁻¹) can be achieved by O_vV₂O₅, and it is capable of undergoing 200 cycles at 0.4 A g⁻¹, with a termination discharge capacity of 103 mAh g⁻¹. Mechanism analysis demonstrated that metastable structures (Al_xV₂O₅ and H_xV₂O₅) were constructed through the insertion of Al³⁺/H⁺ during discharging, which existed in the lattice intercalation with V₂O₅. The incorporation of oxygen vacancies lowers the reaction energy barrier while improving the ion transport efficiency. In addition, the metastable structure allows the electrostatic interaction between Al³⁺ and the main backbone to establish protection and optimize the transport channel. In parallel, this work exploits ex-situ characterization and DFT to obtain a profound insight into the instrumental effect of oxygen vacancies in the construction of metastable structures during in-situ electrochemical activation, with a view to better understanding the mechanism of the synergistic participation of Al³⁺ and H⁺ in the reaction. This work not only reports a method for cathode materials to modulate oxygen vacancies, but also lays the foundation for a deeper understanding of the metastable structure of vanadium oxides.

近年来，水性铝离子电池因其储能丰富、理论容量高而被广泛研究。要解决覆盖在阴极表面的不溶产物析出和反应动力学缓慢的问题，有必要对氧化钒材料进行深入研究。因此，一种采用简单的一步水热法制备和草酸调节氧空位的方法得到了报道。OvV2O5 可实现较高的起始容量（400 mAh g-1），并能在 0.4 A g-1 下进行 200 次循环，最终放电容量为 103 mAh g-1。机理分析表明，在放电过程中，通过插入 Al3+/H+ 构建了与 V2O5 存在晶格插层的可迁移结构（AlxV2O5 和 HxV2O5）。氧空位的加入降低了反应能垒，同时提高了离子传输效率。此外，逸散结构允许 Al3+ 与主骨架之间的静电相互作用，从而建立保护并优化传输通道。与此同时，这项工作利用原位表征和 DFT，深入了解了氧空位在原位电化学活化过程中构建陨变结构的工具效应，以期更好地理解 Al3+ 和 H+ 协同参与反应的机理。这项工作不仅报告了一种阴极材料调控氧空位的方法，而且为更深入地理解钒氧化物的陨变结构奠定了基础。

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引用次数: 0