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Symmetrical dicyano-based imidazole molecule-assisted crystallization and defects passivation for high-performance perovskite solar cells 高性能钙钛矿太阳能电池的对称二氰基咪唑分子辅助结晶和缺陷钝化
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-10-13 DOI: 10.1016/j.jelechem.2023.117857
Xumeng Hu , Shaolin Chen , Shiqi Huang , Minghuang Guo , Jingwei Zhu , Ping Hu , Yafeng Li , Mingdeng Wei

Benefiting from the simple and low-cost fabrication of the one-step anti-solvent spin-coating process, the perovskite solar cells (PSCs) have a boost development. However, a great number of defects are generated during solution-fabrication process, retarding the development of PSCs seriously. In this study, the utilization of 4,5-dicyanoimidazole (DCI) as an additive for perovskite precursor solution was investigated. The presence of the double –CN groups in DCI facilitated the formation of Lewis acid-base coordination with unsaturated Pb2+ ions, as well as interaction with I- anions by the –NH- moiety, resulting in the enhanced perovskite film crystallinity, the reduced grain boundaries, and a significant reduction in the defects density of the perovskite film. The decreased trap-assisted recombination and voltage open circuit (VOC) losses in the PSC resulted in the improved photovoltaic performance of device treated by DCI molecule, the PCE increased from 19.59 % to 21.87 % significantly. Moreover, the unencapsulated device with DCI additive exhibited a remarkable 87.8 % retention of its initial PCE after exposure under 10–20 % relative humidity for 60 days, demonstrating an excellent stability than control device.

得益于一步反溶剂旋涂工艺的简单和低成本制造,钙钛矿太阳能电池(PSC)得到了发展。然而,在溶液制备过程中会产生大量的缺陷,严重阻碍了PSCs的发展。在本研究中,研究了4,5-二氰基咪唑(DCI)作为钙钛矿前体溶液的添加剂的应用。DCI中双-CN基团的存在促进了与不饱和Pb2+离子形成Lewis酸碱配位,以及通过-NH-部分与I-阴离子的相互作用,从而增强了钙钛矿膜的结晶度,减少了晶界,并显著降低了钙钛矿膜中的缺陷密度。PSC中陷阱辅助复合和电压开路(VOC)损失的降低导致DCI分子处理的器件的光伏性能提高,PCE从19.59%显著提高到21.87%。此外,含有DCI添加剂的未封装装置在10–20%相对湿度下暴露60天后,其初始PCE的保留率为87.8%,表现出比对照装置优异的稳定性。
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引用次数: 0
4,4′-Biphenyldicarboxylic acid as an anode for sodium-ion batteries: Different electrochemical behaviors in ester and ether-based electrolytes 4,4′-联苯二羧酸作为钠离子电池阳极:在酯基和醚基电解质中的不同电化学行为
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-10-11 DOI: 10.1016/j.jelechem.2023.117852
Siyao Li , Huijia Wu , Chunjie Wu , Meng Jin , Huan Yi , Shi-Yu Lu , Yan Zhang

Organic electrode materials have been regarded as sustainable alternatives for sodium-ion batteries (SIBs) due to their high theoretical specific capacity, large reserves and wide sources from biomass. However, the variety of presently reported organic electrode materials is very limited and their essential electrochemical sodium storage behaviors also deserve further investigating. In this paper, we explore the electrochemical sodium storage behavior of a conjugated aromatic acid (4,4′-biphenyldicarboxylic acid, H2bpdc) in esters and ethers-based electrolytes. The results illustrate that in esters-based electrolytes, H2bpdc just shows limited capacity and poor electrochemical sodium storage kinetics. By contrast, in ethers-based electrolytes, H2bpdc experiences a process similar to conversion type mechanism from pristine acid to sodium salt, displaying fast kinetics and delivers a high reversible capacity of 280 mA h g−1. This research would provide basic and novel insights to the electrochemical sodium storage behaviors of promising organic electrode materials and accelerate the new materials exploration process for SIBs.

有机电极材料由于其高理论比容量、大储量和广泛的生物质来源,被认为是钠离子电池的可持续替代品。然而,目前报道的有机电极材料的种类非常有限,其基本的电化学钠存储行为也值得进一步研究。在本文中,我们探索了共轭芳香酸(4,4′-联苯二羧酸,H2bpdc)在基于酯和醚的电解质中的电化学钠存储行为。结果表明,在酯类电解质中,H2bpdc的容量有限,电化学储钠动力学较差。相比之下,在基于醚的电解质中,H2bpdc经历了类似于从原始酸到钠盐的转化型机制的过程,表现出快速的动力学,并提供280 mA h g−1的高可逆容量。这项研究将为有前景的有机电极材料的电化学钠存储行为提供基础和新的见解,并加速SIBs的新材料探索过程。
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引用次数: 0
Decoration of Bi2O3NPs-AgNPs-ErGO as a first electrochemical nanosensor for sensitive determination of nelarabine in pharmaceutical dosage form and human serum samples 修饰Bi2O3NPs-AgNPs-ErGO作为首个电化学纳米传感器用于药物剂型和人血清样品中奈拉宾的灵敏测定
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117651
Md. Zahirul Kabir , Cem Erkmen , Sevinc Kurbanoglu , Gözde Aydogdu Tig , Bengi Uslu

In view of the unquestionable necessity for rapid and accurate analysis of drug molecules to monitor patient overdose, numerous nanosensor-based technologies have been developed in addition to quality control of pharmaceutical manufacture and drug administration. In this regard, sensitive detection of a potent anticancer agent, nelarabine (NEL) was examined at the bare and modified glassy carbon electrode (GCE) with the help of differential pulse (DP) and cyclic voltammetry (CV) techniques. A unique and highly effective nanosensor was developed using a combination of bismuth (III) oxide nanoparticles (Bi2O3NPs), silver nanoparticles (AgNPs), and electrochemically reduced graphene oxide (ErGO) onto the GCE surface. The modified Bi2O3NPs-AgNPs-ErGO/GCE was characterized by scanning electron microscopy (SEM), CV, and electrochemical impedance spectroscopy (EIS) investigations. Influences of various parameters viz., loading of Bi2O3NPs, AgNPs, and GO on the modified GCE, electrolyte pH (PBS 7.0), accumulation potential (–0.2 V), and time (60 s), and scan rate (50 mV s−1) were optimized for NEL response. An enhancement in the current responses toward the oxidation of NEL was observed with the Bi2O3NPs-AgNPs-ErGO/GCE compared to that noticed with bare GCE. The modified GCE affirmed high sensitivity, low limit of detection (LOD), excellent reproducibility, repeatability, and storage stability that clearly indicated the effective accuracy of the developed nanosensor. The linear behavior in the concentration range was found to be 0.02–1.0 µM, with LOD values of 0.003 nM in PBS 7.0 and 0.065 nM in serum samples. The electrochemical mechanism of NEL at the bare and modified GCEs were revealed as diffusion-controlled and adsorption-controlled mechanism processes, respectively. The linear calibration curves at both the bare and modified GCEs were noticed for increasing NEL concentrations, as constructed from the DPV measurements. Applications of the Bi2O3NPs-AgNPs-ErGO/GCE for NEL detection in pharmaceutical dosage form and human serum sample showed well-accepted recovery results of 98–99 %. The effect of interfering agents was checked on the selectivity of the developed method, and the modified electrode was found to be selective toward NEL in the presence of these interfering agents.

鉴于对药物分子进行快速和准确的分析以监测患者服药过量的必要性,除了对药品生产和药物管理进行质量控制外,还开发了许多基于纳米传感器的技术。在这方面,利用差分脉冲(DP)和循环伏安法(CV)技术,研究了一种有效的抗癌药物奈拉宾(NEL)在裸露和修饰的玻璃碳电极(GCE)上的敏感检测。将铋(III)氧化物纳米粒子(Bi2O3NPs)、银纳米粒子(AgNPs)和电化学还原氧化石墨烯(ErGO)结合在GCE表面,开发了一种独特且高效的纳米传感器。通过扫描电镜(SEM)、CV和电化学阻抗谱(EIS)对改性Bi2O3NPs-AgNPs-ErGO/GCE进行了表征。优化了Bi2O3NPs、AgNPs和GO负载等参数对改性GCE、电解液pH (PBS 7.0)、积累电位(-0.2 V)、时间(60 s)和扫描速率(50 mV s−1)的影响。与纯GCE相比,Bi2O3NPs-AgNPs-ErGO/GCE对NEL氧化的电流响应增强。改进后的GCE具有高灵敏度、低检出限(LOD)、良好的重现性、可重复性和存储稳定性,表明所开发的纳米传感器具有有效的准确性。在浓度范围内线性行为为0.02 ~ 1.0µM,在PBS 7.0中LOD值为0.003 nM,在血清样品中LOD值为0.065 nM。结果表明,NEL在裸gce和改性gce上的电化学机制分别为扩散控制机制和吸附控制机制。根据DPV测量结果,在裸gce和修饰gce处的线性校准曲线都注意到NEL浓度的增加。应用Bi2O3NPs-AgNPs-ErGO/GCE检测药物剂型和人血清样品的NEL,回收率为98 ~ 99%。研究了干扰剂对该方法选择性的影响,发现在干扰剂存在的情况下,修饰电极对NEL具有选择性。
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引用次数: 0
A novel host–guest recognition electrochemiluminescence system for phenylalanine detection based on Ir@ZnO nanocomposites and cucurbit[8]uril 基于Ir@ZnO纳米复合材料和瓜类化合物的新型主客识别电化学发光检测系统[8]
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117670
Yuhua Luo, Yahui Zhang, Qidong Cao, Yongping Dong

Iridium complexes have been considered as potential promising electrochemiluminescent (ECL) reagents in recent years. However, the instability of ECL signal and easy leaching from the electrode severely limit their applications. In this work, iridium complex doped zinc oxide (ZnO) nanocomposites (Ir@ZnO) were synthesized, which could not only increase the loading amount of iridium complex, but also improve the stability of ECL signal. A sensitive ECL sensor for the detection of phenylalanie (Phe) was proposed via the host–guest recognition of cucurbit[8]uril (Q[8]) and Phe with Ir@ZnO nanocomposites as a signal probe. Q[8] was combined with Ir@ZnO nanocomposites via coordinate bond between carbonyl group of Q[8] and Ir and Zn atoms, which could quench the ECL intensity due to the accommodating ability of Q[8] for dissolved oxygen. In the presence of Phe, Q[8] could be released from the electrode surface through the strong host–guest interaction, and the ECL intensity was restored. The ECL system performed high sensitivity and low detection limit, indicating that the proposed ECL strategy was suitable for the detection of amino acids. Moreover, this work provided a new avenue for the application of water insoluble Ir complexes in ECL sensing field.

近年来,铱配合物被认为是一种很有前途的电化学发光试剂。然而,ECL信号的不稳定性和易从电极中浸出严重限制了其应用。本文合成了铱配合物掺杂氧化锌(ZnO)纳米复合材料(Ir@ZnO),不仅可以增加铱配合物的负载量,还可以提高ECL信号的稳定性。以Ir@ZnO纳米复合材料为信号探针,通过对瓜[8]、脲(Q[8])和苯丙氨酸的主客识别,提出了一种检测苯丙氨酸(Phe)的灵敏ECL传感器。Q[8]通过Q[8]羰基与Ir和Zn原子之间的配位键与Ir@ZnO纳米复合材料结合,由于Q[8]对溶解氧的容纳能力,可以淬灭ECL强度。在苯丙氨酸存在的情况下,Q[8]可以通过强烈的主客体相互作用从电极表面释放出来,并恢复ECL强度。ECL系统灵敏度高,检出限低,表明该方法适用于氨基酸的检测。为水不溶性Ir配合物在ECL传感领域的应用开辟了新的途径。
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引用次数: 1
Competitive electrochemical immunosensors by immobilization of hexahistidine-rich recombinant proteins on the signal labels 通过将富含六组氨酸的重组蛋白固定在信号标签上的竞争性电化学免疫传感器
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117662
Yong Chang , Meiling Liu , Tong Wu , Ruting Lin , Lin Liu , Qijun Song

Most of proteins in the commercial ELISA kits are recombinant with hexahistidine (His6) tags. Based on this fact, we proposed a simple procedure for the preparation of signal labels and the design of competitive immunosensors. The signal labels were fabricated through the high-affinity interaction between the His6 tails on the surface of recombinant proteins and the coordinatively unsaturated copper ions on the surface of pristine Cu-based metal organic framework (Cu-MOF). The recombinant protein-modified MOF could be captured by the sensor electrode, thus producing a strong differential pulse voltammetry signal through the electrochemical reduction of Cu2+ ions in MOF. However, the target protein in sample solution could compete with the His6-tagged protein on the surface of Cu-MOF to bind the antibody attached on the electrode, thus leading to the decrease in the electrochemical signal. The peak current showed an inversely relationship with the concentration of target protein. The competitive immunosensor exhibited a linear range of 1 pg/mL to 1 ng/mL with SARS-CoV-2 nucleocapsid protein (N-protein) as the target analyte. We believe that the method can be used to detect other proteins by utilizing the characteristic of recombinant proteins in commercial kits.

商用ELISA试剂盒中的大多数蛋白质都带有六组氨酸(His6)标签。基于这一事实,我们提出了一种简单的制备信号标签和竞争性免疫传感器的方法。通过重组蛋白表面的His6尾部与原始cu基金属有机骨架(Cu-MOF)表面的配位不饱和铜离子之间的高亲和相互作用制备信号标签。重组蛋白修饰的MOF可以被传感器电极捕获,从而通过电化学还原MOF中的Cu2+离子产生强烈的差分脉冲伏安信号。然而,样品溶液中的靶蛋白会与Cu-MOF表面的his6标记蛋白竞争,与附着在电极上的抗体结合,从而导致电化学信号减弱。峰值电流与靶蛋白浓度呈反比关系。竞争性免疫传感器以SARS-CoV-2核衣壳蛋白(n蛋白)为目标分析物,线性范围为1 pg/mL ~ 1 ng/mL。我们相信该方法可以利用商业试剂盒中重组蛋白的特性来检测其他蛋白质。
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引用次数: 1
Sulphur- and nitrogen-codoped layered double hydroxides with expanded interlayer distance for enhanced overall water splitting 硫氮共掺层状双氢氧化物,扩大层间距离,增强整体水分解
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117640
Changgan Lai , Zhiliang Guo , Liu Nie , Donghuai Zhang , Fajun Li , Shuai Ji

Developing highly active, durable, and non-noble electrocatalysts for water-splitting is critical for efficient renewable energy conversion. Nickel-iron layered double-hydroxide (NiFe-LDH) materials show potential in achieving good catalytic performance, however, which was restricted by the scarce active sites and poor conductivity. Herein, we report a series of NiFe-LDH-based materials of expanded interlayer spacing constructed through S/N co-doping with rich active sites, used as a high-efficient bifunctional electrocatalyst for the oxygen and hydrogen evolution reactions (OER and HER). The experimental results indicate that the intercalation/decoration on the interlayer structure of NiFe-LDH can efficiently reduce the energy barrier and accelerate reaction kinetics. Combining with the structural advantages, including the expanded lattice spacing and exposed active surface sites, the resulting S-N/NiFe-LDH anchored in nickel foam (NF) drives an alkaline electrolyzer with a cell voltage of 1.67 V at a current density of 100 mA cm−2, as well as robust stability over 100 h, which is much superior to the state-of-the-art Pt/C-RuO2 electrocatalysts.

开发高效、耐用、非贵重的水分解电催化剂是实现高效可再生能源转化的关键。镍铁层状双氢氧化物(NiFe-LDH)材料具有良好的催化性能,但受到活性位点稀缺和导电性差的限制。在此,我们报道了一系列通过S/N共掺杂构建的具有丰富活性位点的扩展层间距的nfe - ldh基材料,作为氧和氢析出反应(OER和HER)的高效双功能电催化剂。实验结果表明,在NiFe-LDH的层间结构上插入/修饰可以有效地降低能垒,加快反应动力学。结合结构优势,包括扩展的晶格间距和暴露的活性表面位点,所得到的S-N/NiFe-LDH锚定在泡沫镍(NF)中,在100 mA cm - 2的电流密度下驱动碱性电解槽电压为1.67 V,并且在100小时内具有强大的稳定性,这远远优于最先进的Pt/C-RuO2电催化剂。
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引用次数: 1
Difunctional molecularly imprinted polymers and heterostructured CdS nanoparticle-sensitized ZnO nanorod arrays for antibody-free photoelectrochemical alpha-fetoprotein sensor 双功能分子印迹聚合物和异质结构CdS纳米颗粒敏化ZnO纳米棒阵列用于无抗体的光电化学甲胎蛋白传感器
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117631
Yang Zang, Yan Zhang, Ruhua Wei, Huaiguo Xue, Jingjing Jiang

An antibody-free molecularly imprinted photoelectrochemical sensor was developed for alpha-fetoprotein (AFP) detection by means of difunctional polydopamine-based molecular imprinting polymers (PDA-MIP) on CdS nanoparticle-decorated ZnO nanorod arrays (CdS@ZnO NAs). Among them, the heterostructured CdS@ZnO NAs could accelerate the spatial separation of electron-hole pairs; while PDA-MIP not only provided abundant target recognition sites without expensive antibody, but also further increase the systemic photocurrent due to the enhanced light absorption capacity. After removing template molecules from PDA-MIP, the resulting imprinted cavities could be occupied by target AFP, leading to a decreased photocurrent. Moreover, the prepared sensor had a wide linearity in the range from 1 pg mL−1 to 1000 ng mL−1 with a low detection limit of 0.38 pg mL−1, as well as excellent selectivity and good stability. The application of AFP analysis in real human serum was also achieved, and the recoveries ranged from 99.2% to 105.2%.

利用双功能聚多巴胺分子印迹聚合物(PDA-MIP)在纳米粒子修饰的ZnO纳米棒阵列(CdS@ZnO NAs)上制备了一种检测甲胎蛋白(AFP)的无抗体分子印迹电化学传感器。其中,异质结构CdS@ZnO NAs能够加速电子-空穴对的空间分离;而PDA-MIP不仅在没有昂贵抗体的情况下提供了丰富的目标识别位点,而且由于光吸收能力的增强,进一步增加了系统光电流。从PDA-MIP中去除模板分子后,得到的印迹腔可以被靶AFP占据,导致光电流降低。该传感器在1 pg mL−1 ~ 1000 ng mL−1范围内具有较宽的线性,检测限为0.38 pg mL−1,具有良好的选择性和稳定性。在人血清中也实现了AFP分析的应用,回收率为99.2% ~ 105.2%。
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引用次数: 0
Solvothermal synthesis of sea urchin-like NaxV2O5 structure for ultra-high stability aqueous zinc ion batteries 超高稳定性锌离子电池用类海胆NaxV2O5结构的溶剂热合成
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117665
Yao Xu , Meng-Xin Bai , Zheng-Hua He , Jing-Feng Hou , Ling-Bin Kong

Vanadium pentoxide, as a low-cost, safe and reliable cathode electrode material. Its structure is prone to collapse during the process of repeated Zn2+ intercalation and deintercalation of aqueous zinc-ion batteries (AZIBs), so enhancing the structural stability of vanadium pentoxide and improving the rate performance has always been a challenge. In this work, sea urchin-like NaxV2O5 vanadate materials are obtained by solvothermal reaction, and the prepared samples exhibit a fast ion transport path during the process of Na+ chemical embedding in V2O5 framework, which is due to the plentiful active sites that nanowires can provide. This paves the way for high magnification performance. In addition, the unique sea urchin-like morphology with a large specific surface can continuously adapt to strain during ion insertion to obtain excellent long cycle performance. The above merits endow NaVO with a highly stable discharge capacity of 250.5 mA g−1 at 0.5 A/g and a long cycle capacity of 100 mA h g−1 maintains for more than 11,000 cycles at 10 A/g. Remarkably, the capacity retention rate up to 85.7%.

五氧化二钒,作为一种低成本、安全可靠的阴极电极材料。水溶液锌离子电池(AZIBs)在反复插入和脱嵌Zn2+的过程中,其结构容易崩溃,因此提高五氧化二钒的结构稳定性和提高倍率性能一直是一个挑战。本研究通过溶剂热反应制备了类似海胆的钒酸钠材料,制备的样品在V2O5框架中化学包埋Na+的过程中表现出快速的离子传输路径,这是由于纳米线可以提供丰富的活性位点。这为高放大性能铺平了道路。此外,独特的海胆样形态具有较大的比表面积,可以在离子插入过程中不断适应应变,从而获得优异的长周期性能。上述优点赋予了NaVO在0.5 a /g下具有250.5 mA g - 1的高度稳定的放电容量和100 mA h g - 1的长循环容量,在10 a /g下保持超过11,000次循环。值得注意的是,容量保留率高达85.7%。
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引用次数: 2
Synergistic engineering of infiltration–coating strategy and interfacial interaction boosts pseudocapacitive kinetics for zinc-ion capacitor 渗涂策略和界面相互作用的协同工程提高了锌离子电容器的赝电容动力学
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117634
Fangyuan Liu, Ling Liu, Yudong Lan, Jiarong Wu, Xinyu Li

Effective adjustment of structure and interface charge transfer ability of composite electrode materials are the key to improve the electrochemical performance of the zinc-ion capacitor. Herein, a novel 3D birdcage-like architecture composed of interactive carbon nanotube (CNT) network confining ZIF-67 is prepared though the infiltration–coating strategy, followed by a photo-assisted method to reinforce the coupling interaction between ZIF-67 and CNTs, which is directly used as an cathode of zinc-ion capacitors (ZICs). In terms of this composite, the birdcage-like structure with abundant voids facilitates the ionic/electrolyte transport and buffers the shrinkage/expansion of pseudocapacitive ZIF-67 during intercalation–conversion–deintercalation reactions. Moreover, the robust connection between the ZIF-67 and CNTs can effectively prevent structural deterioration and ensure the ion/electron transport between ZIF-67 and CNTs, thus resulting in a high Zn ion diffusion coefficient, which synergistically guarantees the rate capability and cyclic stability of ZICs. Consequently, the ZICs exhibit a high specific capacitance of 142.33F g−1 (0.5 A/g) and a high energy density of 44.5 Wh kg−1 (375 W kg−1). Furthermore, the ZICs shows excellent cycling stability (92.5% capacitance retention after 5000 cycles at a current density of 0.5 A/g). Our work provides a novel design tactic to enhance the storage properties of zinc ions.

有效调整复合电极材料的结构和界面电荷转移能力是提高锌离子电容器电化学性能的关键。本文通过渗透涂层策略制备了一种新型的三维鸟笼状结构,该结构由约束ZIF-67的相互作用碳纳米管(CNT)网络组成,然后通过光辅助方法增强ZIF-67与碳纳米管之间的耦合相互作用,并将其直接用作锌离子电容器(ZICs)的阴极。在该复合材料中,具有丰富空隙的鸟笼状结构有利于离子/电解质的传输,并缓冲假电容性ZIF-67在插层-转化-脱层反应中的收缩/膨胀。此外,ZIF-67与CNTs之间的牢固连接可以有效防止结构劣化,保证ZIF-67与CNTs之间的离子/电子传递,从而获得较高的Zn离子扩散系数,协同保证了ZICs的速率能力和循环稳定性。因此,zic具有142.33F g−1 (0.5 a /g)的高比电容和44.5 Wh kg−1 (375 W kg−1)的高能量密度。此外,zic表现出优异的循环稳定性,在0.5 a /g电流密度下,5000次循环后电容保持率为92.5%。我们的工作提供了一种新的设计策略来提高锌离子的储存性能。
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引用次数: 1
Fast solvent evaporation of phase pure CuBi2O4 photocathodes for photoelectrocatalytic water splitting 相纯CuBi2O4光电阴极用于光电催化水分解的快速溶剂蒸发
IF 4.5 3区 化学 Q1 Chemical Engineering Pub Date : 2023-09-01 DOI: 10.1016/j.jelechem.2023.117639
Yiwen Wang , Junhua Hu , Suxiang Liu , Di Zhu , Baofeng Zhao , Angang Song

P-type metal oxide semiconductor CuBi2O4 exhibits excellent energy band structures and photoelectric response characteristics, which are critical for photoelectrocatalytic water splitting. However, the photocurrent densities are still well below the theoretical limit due to poor charge carrier separation and transport properties. In this work, we report a synthetic method for the preparation of phase-pure CuBi2O4 photocathode films via spray pyrolysis by adjusting the evaporation rate of the atomized droplets. An increase in the evaporation rate of the solvent may fix the structure of the deposited film faster and decrease the time available for the establishment of the segregation gradient, thus producing phase-pure semiconductor films. This method reduces process complexity and cost, and the applicability of spray pyrolysis for the preparation of phase-pure CuBi2O4 films is also confirmed. In addition, the photoelectrochemical evaluation of the samples prepared under different treatment conditions reveals that hole transport critically affects the photoelectrocatalytic performance of CuBi2O4 photocathodes. CuO can be used as a hole transport layer to promote the collection and transfer of holes and reduce the recombination of photogenerated carriers.

p型金属氧化物半导体CuBi2O4具有优异的能带结构和光电响应特性,这是光电催化水分解的关键。然而,由于载流子分离和输运性能差,光电流密度仍然远低于理论极限。本文报道了一种通过调节雾化液滴的蒸发速率,通过喷雾热解法制备相纯CuBi2O4光电阴极薄膜的合成方法。溶剂蒸发速率的增加可以更快地固定沉积膜的结构,减少建立偏析梯度的时间,从而产生相纯半导体膜。该方法降低了工艺复杂度和成本,也证实了喷雾热解制备相纯CuBi2O4薄膜的适用性。此外,对不同处理条件下制备的样品进行了光电化学评价,发现空穴输运对CuBi2O4光电阴极的光电催化性能有重要影响。CuO可以作为空穴传输层,促进空穴的收集和转移,减少光生载流子的复合。
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Journal of Electroanalytical Chemistry
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