Highly Efficient Transfer of Quantum State and Robust Generation of Entanglement State Around Exceptional Lines

Exceptional points (EPs) are non-Hermitian degeneracies or branch points where eigenvalues and their corresponding eigenvectors coalesce. Due to the complex non-trivial topology of Riemann surfaces associated with non-Hermitian Hamiltonians, the dynamical encirclement or proximity of EPs in parameter space has been shown to lead to topological mode conversions and some novel physical phenomena. In fact, degeneracies can also form continuous line geometries, which are called exceptional lines (ELs). The problem is whether the state transfer around the ELs can show different characteristics from the EPs, which is less explored. Here, novel properties of quantum state transfer around the ELs based on a quantum walk platform are explored. It is found that the evolutionary state around the ELs is independent of the initial state and evolution direction, and the transfer of quantum state is more efficient than the case around the EPs. Furthermore, based on such a property, an entangled state generation insensitive to the incident state is realized experimentally. The work opens up a new way for the application of non-Hermitian physics in the field of quantum information.     

用反相离子对色谱-蒸发光散射检测法研究阿仑膦酸钠及其相关物质的分离

采用反相离子对色谱-蒸发光散射检测法,研究了阿仑膦酸钠及相关物质的色谱分离。选择的色谱条件是:固定相为Intersil C8(150×4.6 mm i.d.,5μm)柱,以52mmol.L-1正戊胺水溶液(用乙酸调节pH至7.0)-甲醇(98∶2,V/V)为流动相,流速为1.0 mL.min-1,柱温为室温。在该色谱条件下,阿仑膦酸钠与其有关物质(包括合成过程中残余的原料4-氨基丁酸、亚磷酸及分解产物磷酸盐)分离良好。本法简便、快速,为阿仑膦酸钠的常规分析及质量控制提供了一种可靠而有效的手段。     

锂负极失效的全固态薄膜锂电池的直接回收再利用

作为微电子器件的理想电源，全固态薄膜锂电池(TFB)已经被广泛地研究了几十年，并开始进入商业化应用。然而，目前关于失效TFB的回收与再利用的研究几乎没有，这将会阻碍TFB的可持续发展。本工作针对因金属锂负极失效而造成电池失效的TFB，提出了一种简单的基于最常见LiCoO₂ (LCO)/LiPON/Li TFB (F-TFB)的直接回收再利用的方法。研究发现，F-TFB中的金属锂负极薄膜在循环过程会被部分氧化从而造成电池失效。我们提出利用无水乙醇溶液有效地溶解并去除F-TFB上失效的金属锂负极部分，从而快速地回收底层的LCO/LiPON薄膜。结构分析和表面分析结果表明，回收的LCO/LiPON薄膜中的LCO正极的晶体结构、LCO/LiPON的界面结构以及LiPON电解质的表面保持完好，使其再利用成为了可能。进一步地，我们在回收的LCO/LiPON薄膜上依次沉积了LiPON和Li薄膜，构建得到了电化学性能恢复的LCO/LiPON/Li TFB，并获得了与新制备的TFB相一致的比容量(0.223 mAh∙cm⁻²)、良好的倍率性能和循环寿命(500次循环后容量保持率为77.3%)。这种简单而有效的回收再利用方法有望延长固态电池的使用寿命，减少能源和资源消耗，促进固态电池的可持续发展。     

Unveiling the Critical Role of Ion Coordination Configuration of Ether Electrolytes for High Voltage Lithium Metal Batteries

Albeit ethers are favorable electrolyte solvents for lithium (Li) metal anode, their inferior oxidation stability (<4.0 V vs. Li/Li⁺) is problematic for high-voltage cathodes. Studies of ether electrolytes have been focusing on the archetype glyme structure with ethylene oxide moieties. Herein, we unveil the crucial effect of ion coordination configuration on oxidation stability by varying the ether backbone structure. The designed 1,3-dimethoxypropane (DMP, C3) forms a unique six-membered chelating complex with Li⁺, whose stronger solvating ability suppresses oxidation side reactions. In addition, the favored hydrogen transfer reaction between C3 and anion induces a dramatic enrichment of LiF (a total atomic ratio of 76.7 %) on the cathode surface. As a result, the C3-based electrolyte enables greatly improved cycling of nickel-rich cathodes under 4.7 V. This study offers fundamental insights into rational electrolyte design for developing high-energy-density batteries.     

Cross-Electrophile Coupling between Two Different Tosylates Enabled by Nickel/Palladium Cooperative Catalysis

Cross-electrophile coupling reactions are efficient for the construction of carbon-carbon bonds under relatively mild conditions, and hence widely used for making new molecules. Among various electrophiles, the cross-electrophile coupling reaction between two different tosylates has been rarely studied. Herein, we present a cross-electrophile coupling of gem-difluoroalkenyl tosylate (C(sp²)−OTs) and α-CF₃ benzyl tosylate (C(sp³)−OTs) by nickel/palladium cooperative catalysis. Mechanistic investigation indicated that the activation of C(sp²)−OTs bond and C(sp³)−OTs bond was facilitated by nickel and palladium respectively.     

Mimicking Photosynthesis: A Natural Z-Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

All-solid-state Z-Scheme photocatalysts have attracted significant attention due to their great potential for solar fuel production. However, delicately coupling two individual semiconductors with a charge shuttle by a material strategy remains a challenge. Herein, we demonstrate a new protocol of natural Z-Scheme heterostructures by strategically engineering the component and interfacial structure of red mud bauxite waste. Advanced characterizations elucidated that the hydrogen-induced formation of metallic Fe enabled the effective Z-Scheme electron transfer from γ-Fe₂O₃ to TiO₂, leading to the significantly boosted spatial separation of photo-generated carriers for overall water splitting. To the best of our knowledge, it is the first Z-Scheme heterojunction based on natural minerals for solar fuel production. Thus our work provides a new avenue toward the utilization of natural minerals for advanced catalysis applications.