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The low-temperature deposition of a zincophilic carbon layer on the Zn foil for long-life zinc metal batteries 低温沉积在长寿命锌金属电池用锌箔上的亲锌碳层
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60947-4
Chun-yu LI, Ming-hui ZHANG, Xin-yue LANG, Ye CHEN, Yan-feng DONG
Aqueous zinc metal batteries (ZMBs) which are environmentally benign and cheap can be used for grid-scale energy storage, but have a short cycling life mainly due to the poor reversibility of zinc metal anodes in mild aqueous electrolytes. A zincophilic carbon (ZC) layer was deposited on a Zn metal foil at 450 °C by the up-stream pyrolysis of a hydrogen-bonded supramolecular substance framework, assembled from melamine (ME) and cyanuric acid (CA). The zincophilic groups (C=O and C=N) in the ZC layer guide uniform zinc plating/stripping and eliminate dendrites and side reactions. so that assembled symmetrical batteries (ZC@Zn//ZC@Zn) have a long-term service life of 2500 h at 1 mA cm−2 and 1 mAh cm−2, which is much longer than that of bare Zn anodes (180 h). In addition, ZC@Zn//V2O5 full batteries have a higher capacity of 174 mAh g−1 after 1200 cycles at 2 A g−1 than a Zn//V2O5 counterpart (100 mAh g−1). The strategy developed for the low-temperature deposition of the ZC layer is a new way to construct advanced zinc metal anodes for ZMBs.
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水锌金属电池(zmb)是一种环保、廉价的电池,可用于电网规模的储能,但其循环寿命较短,主要原因是锌金属阳极在温和的水溶液中可逆性差。采用由三聚氰胺(ME)和三聚氰尿酸(CA)组成的氢键超分子骨架,在450℃的高温下,在锌金属箔上沉积了亲锌碳(ZC)层。ZC层中的亲锌基团(C=O和C=N)引导均匀的锌镀/剥离,消除枝晶和副反应。因此,组装的对称电池(ZC@Zn//ZC@Zn)在1ma cm - 2和1mah cm - 2下的长期使用寿命为2500 h,远远超过裸锌阳极(180 h)。此外,ZC@Zn//V2O5电池在2a g- 1下循环1200次后的容量为174 mAh g- 1,高于Zn//V2O5电池(100 mAh g- 1)。所开发的低温沉积ZC层的策略为zmb制备高级锌金属阳极提供了一条新途径。下载:下载高分辨率图片(157KB)下载:下载全尺寸图片
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引用次数: 0
A B,N co-doped carbon nanotube array with anchored MnO2 nanosheets as a flexible cathode for aqueous zinc-ion batteries 锚定 MnO2 纳米片的 B、N 共掺杂碳纳米管阵列作为水性锌离子电池的柔性阴极
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60945-0
Yan-bing YUAN , Zong-bin ZHAO , Hong-hui BI , Run-meng ZHANG , Xu-zhen WANG , Jie-shan QIU
For rechargeable aqueous zinc-ion batteries (ZIBs), the design of nanocomposites comprised of electrochemically active materials and carbon materials with novel structures has great promise in addressing the issue of electrical conductivity and structural stability in the electrode materials during electrochemical cycling. We report the production of a novel flexible electrode material, by anchoring MnO2 nanosheets on a B,N co-doped carbon nanotube array (BNCNTs) grown on carbon cloth (BNCNTs@MnO2), which was fabricated by in-situ pyrolysis and hydrothermal growth. The generated BNCNTs were strongly bonded to the surface of the carbon fibers in the carbon cloth which provides both excellent electron transport and ion diffusion, and improves the stability and durability of the cathode. Importantly, the BNCNTs offer more active sites for the hydrothermal growth of MnO2, ensuring a uniform distribution. Electrochemical tests show that BNCNTs@MnO2 delivers a high specific capacity of 310.7 mAh g−1 at 0.1 A g−1, along with excellent rate capability and outstanding cycling stability, with a 79.7% capacity retention after 8000 cycles at 3 A g−1.
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对于可充电水性锌离子电池,由电化学活性材料和结构新颖的碳材料组成的纳米复合材料的设计对于解决电极材料在电化学循环过程中的导电性和结构稳定性问题具有很大的前景。我们报道了一种新型柔性电极材料的生产,通过原位热解和水热生长,将二氧化锰纳米片锚定在生长在碳布(BNCNTs@MnO2)上的B,N共掺杂碳纳米管阵列(BNCNTs)上。生成的BNCNTs在碳布中与碳纤维表面紧密结合,提供了良好的电子传递和离子扩散,提高了阴极的稳定性和耐久性。重要的是,BNCNTs为MnO2的水热生长提供了更多的活性位点,确保了其均匀分布。电化学测试表明,BNCNTs@MnO2在0.1 a g−1下可提供310.7 mAh g−1的高比容量,同时具有出色的倍率能力和出色的循环稳定性,在3a g−1下循环8000次后容量保持率为79.7%。下载:下载高清图片(181KB)下载:下载全尺寸图片
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引用次数: 0
Advances in the use of biomass-derived carbons for sodium-ion batteries 生物质碳用于钠离子电池的研究进展
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60953-X
Mei-ci SUN , Shuo-lin QI , Yun-he ZHAO , Chun-xia CHEN , Li-chao TAN , Zhong-li HU , Xiao-liang WU , Wen-li ZHANG
Sodium-ion batteries (SIBs) have emerged as a promising alternative to commercial lithium-ion batteries because of the similar properties of Li and Na as well as the abundance and accessibility of sodium resources. The development of anode materials with a high capacity, excellent rate performance, and long cycle life is the key to the industrialization of SIBs. Biomass-derived carbon (BDC) anode materials synthesized from resource-rich, low-cost, and renewable biomass have been extensively researched and their excellent sodium storage performance has been proven, making them the most promising new low-cost and high-performance anode material for SIBs. This review first introduces the sources of BDCs, including waste biomass such as plants, animals, and microorganisms, and then describes several methods for preparing BDC anode materials, including carbonization, chemical activation, and template methods. The storage mechanism and kinetic process of Na+ in BDCs are then considered as well as their structure control. The electrochemical properties of sodium-ion storage in BDCs with different structures are examined, and suggestions for future research are made.
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钠离子电池(SIBs)已成为商用锂离子电池的一个有前途的替代品,因为锂和钠具有相似的性质,以及钠资源的丰富和可获得性。开发高容量、高倍率、长循环寿命的负极材料是sib产业化的关键。以资源丰富、低成本、可再生的生物质为原料合成的生物质衍生碳(BDC)负极材料得到了广泛的研究,其优异的储钠性能已被证明是最有前途的低成本、高性能sib负极材料。本文首先介绍了BDC的来源,包括植物、动物和微生物等废弃生物质,然后介绍了制备BDC阳极材料的几种方法,包括炭化法、化学活化法和模板法。研究了Na+在bdc中的储存机理、动力学过程及其结构控制。考察了不同结构bdc中钠离子存储的电化学性能,并对今后的研究提出了建议。下载:下载高清图片(181KB)下载:下载全尺寸图片
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引用次数: 0
The use of a ternary metal sulfide loading on carbon fibers as the sulfur host for high performance low-temperature lithium sulfur batteries 在碳纤维上负载三元金属硫化物作为高性能低温硫锂电池的硫宿主
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(24)60942-X
Xin HE , Huai-yang ZUO , Ru XIAO , Zhuo-yan QU , Zhen-hua SUN , Bao WANG , Feng Li
The use of lithium-sulfur (Li-S) batteries is limited by sulfur redox reactions involving multi-phase transformations, especially at low-temperatures. To address this issue, we report a material (FCNS@NCFs) consisting of nitrogen-doped carbon fibers loaded with a ternary metal sulfide ((Fe, Co, Ni)9S8) for use as the sulfur host in Li-S batteries. This material was prepared using transfer blot filter paper as the carbon precursor, thiourea as the source of nitrogen and sulfur, and FeCl3·6H2O, CoCl2·6H2O and NiCl2·6H2O as the metal ion sources. It was synthesized by an impregnation method followed by calcination. The nitrogen doping significantly increased the conductivity of the host, and the metal sulfides have excellent catalytic activities. Theoretical calculations, and adsorption and deposition experiments show that active sites on the surface of FCNS@NCFs selectively adsorb polysulfides, facilitate rapid adsorption and conversion, prevent cathode passivation and inhibit the polysulfide shuttling. The FCNS@NCFs used as the sulfur host has excellent electrochemical properties. Its initial discharge capacity is 1639.0 mAh g−1 at 0.2 C and room temperature, and it remains a capacity of 1255.1 mAh g−1 after 100 cycles. At −20 ~C, it has an initial discharge capacity of 1578.5 mAh g−1 at 0.2 C, with a capacity of 867.5 mAh g−1 after 100 cycles. Its excellent performance at both ambient and low temperatures suggests a new way to produce high-performance low-temperature Li-S batteries.
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锂硫(Li-S)电池的使用受到硫氧化还原反应涉及多相转化的限制,特别是在低温下。为了解决这个问题,我们报告了一种材料(FCNS@NCFs),该材料由氮掺杂碳纤维组成,负载三元金属硫化物((Fe, Co, Ni)9S8),用于Li-S电池中的硫宿主。该材料以转移印迹滤纸为碳前驱体,硫脲为氮源和硫源,FeCl3·6H2O、CoCl2·6H2O和NiCl2·6H2O为金属离子源制备。采用浸渍-煅烧法制备。氮的掺杂显著提高了载体的导电性,金属硫化物具有优异的催化活性。理论计算和吸附沉积实验表明,FCNS@NCFs表面活性位点选择性吸附多硫化物,有利于快速吸附转化,防止阴极钝化,抑制多硫化物穿梭。FCNS@NCFs作为硫主体具有优异的电化学性能。在0.2℃和室温下,其初始放电容量为1639.0 mAh g−1,循环100次后,其放电容量仍为1255.1 mAh g−1。在−20℃时,0.2℃时的初始放电容量为1578.5 mAh g−1,循环100次后的放电容量为867.5 mAh g−1。它在环境和低温下的优异性能为生产高性能低温锂电池提供了一条新途径。下载:下载高清图片(82KB)下载:下载全尺寸图片
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引用次数: 0
Ultra-stable lithium-sulfur batteries using nitrogen-doped porous carbon nanosheets implanted with both Fe and Ni 利用氮掺杂多孔碳纳米片植入铁和镍的超稳定锂硫电池
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60944-9
Reddeppa Nadimicherla , You-chen TANG , Yu-heng LU , Ru-liang LIU
The major problem with lithium-sulfur (Li-S) batteries is their poor cycling stability because of slow redox kinetics in the cathode and the growth of lithium dendrites on the anode. We report the production of 2D porous carbon nanosheets doped with both Fe and Ni (Fe/Ni-N-PCNSs) by an easy and template-free approach that solve this problem. Because of their ultrathin porous 2D structure and uniform distribution of Fe and Ni dopants, they capture polysulfides, speed up the sulfur redox reaction, and improve the material’s lithiophilicity, greatly suppressing the shuttling of polysulfides and dendrite growth on the lithium anode. As a result, it has an exceptional performance as a stable host for elemental sulfur and metallic lithium, producing a record long life of 1000 cycles with a very small capacity decay of 0.00025% per cycle in a Li-S battery and an excellent cycling stability of over 850 h with a small overpotential of >72 mV in a lithium metal battery. This work suggests the use of multifunctional-based 2D porous carbon nanosheets as a stable host for both elemental sulfur and metallic lithium to improve the Li-S battery performance.
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锂硫(li -硫)电池的主要问题是由于阴极氧化还原动力学缓慢和阳极锂枝晶生长而导致循环稳定性差。我们报道了用一种简单且无模板的方法生产掺杂Fe和Ni的二维多孔碳纳米片(Fe/Ni- n - pcnss),从而解决了这一问题。由于其超薄的二维多孔结构和均匀分布的Fe和Ni掺杂剂,可以捕获多硫化物,加快硫的氧化还原反应,提高材料的亲锂性,大大抑制了多硫化物在锂阳极上的穿梭和枝晶生长。因此,它作为单质硫和金属锂的稳定宿主具有优异的性能,在Li-S电池中产生创纪录的1000次循环的长寿命,每次循环的容量衰减极小,为0.00025%,在锂金属电池中具有850小时以上的优异循环稳定性,过电位为>;72 mV。这项工作表明,使用基于多功能的二维多孔碳纳米片作为元素硫和金属锂的稳定宿主,可以提高Li-S电池的性能。下载:下载高分辨率图片(65KB)下载:下载全尺寸图片
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引用次数: 0
A review of high thermal conductivity carbon-based materials for microwave absorption materials 高导热碳基微波吸收材料研究进展
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60948-6
Zheng-xuan LI , Xi WU , Bo JIANG , Wang YANG , Jun-yan DONG , Zhong-zhen DING , Chen ZHANG , Shao-xiong DU , Si-yuan LI , Ruo-yao FENG , Yong-feng LI
The ever-increasing integration of electronic devices has inevitably caused electromagnetic interference and heat accumulation problems, and dual-function materials with both a high thermal conductivity and high electromagnetic wave absorption (EWA) are regarded as an effective strategy for solving these problems. Carbon materials are widely used as thermal and EWA fillers due to their excellent conductivity and outstanding thermal conduction properties, and have become a research hotspot in the field of high thermal conductivity, microwave absorbing materials in recent years. The status of current research progress on carbon-based high thermalconduction microwave absorption materials, including carbon fibers, carbon nanotubes, graphene and amorphous carbon, is reviewed, and the influence of the structure of the materials on their absorption and thermal conductivity properties, such as core-shell structure, three-dimensional network structure, and heteroatom doping, is also elaborated. Feasible solutions for the current problems with these materials are proposed, with the aim of providing valuable guidance for the future design of carbon-based high thermal conduction microwave absorbing materials.
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随着电子器件集成度的不断提高,不可避免地会产生电磁干扰和热积累问题,而兼具高导热性和高电磁波吸收(EWA)的双功能材料被认为是解决这些问题的有效策略。碳材料以其优异的导电性和优异的导热性能被广泛应用于热工和EWA填料,成为近年来高导热吸波材料领域的研究热点。综述了碳纤维、碳纳米管、石墨烯、非晶碳等碳基高热导微波吸收材料的研究现状,并阐述了核壳结构、三维网络结构、杂原子掺杂等材料结构对其吸收和导热性能的影响。针对这些材料目前存在的问题,提出了可行的解决方案,旨在为未来碳基高导热吸波材料的设计提供有价值的指导。下载:下载高分辨率图片(119KB)下载:下载全尺寸图片
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引用次数: 0
A review of carbon-based hybrid materials for supercapacitors 超级电容器用碳基混合材料综述
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60943-7
Theodore Azemtsop Manfo , Hannu Laaksonen
Supercapacitors are gaining popularity due to their high cycling stability, power density, and fast charge and discharge rates. Researchers are exploring electrode materials, electrolytes, and separators for cost-effective energy storage systems. Advances in materials science have led to the development of hybrid nanomaterials, such as combining filamentous carbon forms with inorganic nanoparticles, to create new charge and energy transfer processes. Notable materials for electrochemical energy-storage applications include MXenes, 2D transition metal carbides, and nitrides, carbon black, carbon aerogels, activated carbon, carbon nanotubes, conducting polymers, carbon fibers, and nanofibers, and graphene, because of their thermal, electrical, and mechanical properties. Carbon materials mixed with conducting polymers, ceramics, metal oxides, transition metal oxides, metal hydroxides, transition metal sulfides, transition metal dichalcogenide, metal sulfides, carbides, nitrides, and biomass materials have received widespread attention due to their remarkable performance, eco-friendliness, cost-effectiveness, and renewability. This article explores the development of carbon-based hybrid materials for future supercapacitors, including electric double-layer capacitors, pseudocapacitors, and hybrid supercapacitors. It investigates the difficulties that influence structural design, manufacturing (electrospinning, hydrothermal/ solvothermal, template-assisted synthesis, electrodeposition, electrospray, 3D printing) techniques and the latest carbon-based hybrid materials research offer practical solutions for producing high-performance, next-generation supercapacitors.
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超级电容器由于其高循环稳定性,功率密度和快速充放电速率而越来越受欢迎。研究人员正在探索具有成本效益的储能系统的电极材料、电解质和分离器。材料科学的进步导致了混合纳米材料的发展,例如将丝状碳形式与无机纳米颗粒相结合,以创造新的电荷和能量转移过程。电化学储能应用中值得注意的材料包括MXenes、二维过渡金属碳化物和氮化物、炭黑、碳气凝胶、活性炭、碳纳米管、导电聚合物、碳纤维和纳米纤维以及石墨烯,因为它们具有热、电和机械性能。与导电聚合物、陶瓷、金属氧化物、过渡金属氧化物、金属氢氧化物、过渡金属硫化物、过渡金属二硫化物、金属硫化物、碳化物、氮化物和生物质材料混合的碳材料因其优异的性能、生态友好性、成本效益和可再生性而受到广泛关注。本文探讨了用于未来超级电容器的碳基杂化材料的发展,包括双层电电容器、伪电容器和杂化超级电容器。它研究了影响结构设计、制造(静电纺丝、水热/溶剂热、模板辅助合成、电沉积、电喷涂、3D打印)技术的困难,以及最新的碳基混合材料研究,为生产高性能、下一代超级电容器提供了实用的解决方案。下载:下载高分辨率图片(158KB)下载:下载全尺寸图片
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引用次数: 0
N/O co-doped microporous carbon as a high-performance electrode for supercapacitors N/O共掺杂微孔碳作为超级电容器的高性能电极
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60951-6
Jing-jing YAN , Xiao-hao FANG , De-zhou YAO , Cheng-wei ZHU , Jian-jun SHI , Shan-shan QIAN
Carbon materials with adjustable porosity, controllable heteroatom doping and low-cost have been received considerable attention as supercapacitor electrodes. However, using carbon materials with abundant micropores, a high surface area and a high-dopant content for an aqueous supercapacitor with a high energy output still remains a challenge. We report the easy synthesis of interconnected carbon spheres by a polymerization reaction between p-benzaldehyde and 2,6-diaminopyridine. The synthesis involves adjusting the mass ratio of the copolymer and KOH activator to achieve increased charge storage ability and high energy output, which are attributed to the high ion-accessible area provided by the large number of micropores, high N/O contents and rapid ion diffusion channels in the porous structure. At a PMEC∶KOH mass ratio of 1∶1, the high electrolyte ion-adsorption area (2599.76 m2 g−1) and the N/O dopant atoms of the conductive framework of a typical carbon electrode produce a superior specific capacity (303.2 F g−1@0.5 A g−1) giving an assembled symmetric capacitor a high energy delivery of 11.3 Wh kg−1@250 W kg−1. This study presents a simple strategy for synthesizing microporous carbon and highlights its potential use in KOH-based supercapacitors.
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孔隙率可调、杂原子掺杂可控、成本低的碳材料作为超级电容器电极受到广泛关注。然而,使用具有丰富微孔、高表面积和高掺杂含量的碳材料制造具有高能量输出的水性超级电容器仍然是一个挑战。我们报道了通过对苯甲醛和2,6-二氨基吡啶的聚合反应,简单地合成了相互连接的碳球。该合成通过调节共聚物和KOH活化剂的质量比来提高电荷存储能力和高能量输出,这是由于多孔结构中大量的微孔、高N/O含量和快速的离子扩散通道提供了高离子可达面积。在PMEC∶KOH质量比为1∶1时,典型碳电极的导电框架的高电解质离子吸附面积(2599.76 m2 g−1)和N/O掺杂原子产生了优越的比容量(303.2 F g−1@0.5 a g−1),使组装的对称电容器具有11.3 Wh kg−1@250 W kg−1的高能量输送。本研究提出了一种简单的合成微孔碳的策略,并强调了其在koh基超级电容器中的潜在应用。下载:下载高分辨率图片(53KB)下载:下载全尺寸图片
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引用次数: 0
The use of an oxidized carbon nanotube film to control Zn deposition and eliminate dendrite formation in a Zn ion battery 利用氧化碳纳米管薄膜控制锌离子电池中锌的沉积和消除枝晶的形成
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60950-4
Pin-xiang LI , Zhe-han YI , Ye-xing WANG , Chang HE , Ji LIANG , Feng HOU
Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy storage due to their high safety, cost-effectiveness, and environmental friendliness. However, uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the stability of Zn batteries. We report the synthesis of an air-oxidized carbon nanotube (O-CNT) film by chemical vapor deposition followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth. The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface. The porous structure of the O-CNT film homogenizes the Zn2+ ion flux and the electric field on the surface of the Zn foil, leading to the uniform deposition of Zn. As a result, a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm−2 with a capacity of 1 mAh cm−2, and values of more than 2000 h and 1 mAh cm−2 at 5 mA cm−2. In addition, a O-CNT@Zn || Mn2+ inserted hydrated vanadium pentoxide (MnVOH) full cell has a better rate performance than a Zn || MnVOH cell, achieving a high discharge capacity of 194 mAh g−1 at a high current density of 8 A g−1. In a long-term cycling test, the O-CNT@Zn || MnVOH full cell has a capacity retention of 58.8% after 2000 cycles at a current density of 5 A·g−1.
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水锌离子电池因其高安全性、高成本效益和环境友好性被认为是大规模储能最有前途的候选者之一。然而,锌枝晶生长不受控制和锌阳极的副反应降低了锌电池的稳定性。采用化学气相沉积和空气热处理的方法合成了一种空气氧化碳纳米管(O-CNT)薄膜,该薄膜用作锌箔的保护层以抑制锌枝晶的生长。空气氧化导致O-CNT膜亲水性提高,有利于锌在膜与阳极之间沉积,而不是沉积在膜表面。O-CNT薄膜的多孔结构使锌箔表面的Zn2+离子通量和电场均匀化,从而使锌的沉积均匀。因此,O-CNT@Zn对称电池具有更好的循环稳定性,在1ma cm - 2时的寿命超过3000小时,容量为1mah cm - 2,在5ma cm - 2时的值超过2000小时和1mah cm - 2。此外,O-CNT@Zn || Mn2+插入的水合五氧化钒(MnVOH)电池具有比Zn || MnVOH电池更好的倍率性能,在8 a g−1的高电流密度下实现了194 mAh g−1的高放电容量。在长期循环测试中,在5 a·g−1的电流密度下,O-CNT@Zn || MnVOH满电池在2000次循环后的容量保持率为58.8%。下载:下载高清图片(102KB)下载:下载全尺寸图片
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引用次数: 0
P, N co-doped hollow carbon nanospheres prepared by micellar copolymerization for increased hydrogen evolution in alkaline water 用胶束共聚法制备P、N共掺杂中空碳纳米球,提高碱性水中析氢速率
IF 5.7 3区 材料科学 Q2 Materials Science Pub Date : 2025-02-01 DOI: 10.1016/S1872-5805(25)60949-8
Yi-meng HAN, Hao XIONG, Jia-ying YANG, Jian-gan WANG, Fei XU
The design of cost-effective and efficient metal-free carbon-based catalysts for the hydrogen evolution reaction (HER) is of great significance for increasing the production of clean hydrogen by the electrolysis of alkaline water. Precise control of the electronic structure by heteroatom doping has proven to be efficient for increasing catalytic activity. Nevertheless, both the structural characteristics and the underlying mechanism are not well understood, especially for doping with two different atoms, thus limiting the use of these catalysts. We report the production of phosphorus and nitrogen co-doped hollow carbon nanospheres (HCNs) by the copolymerization of pyrrole and aniline at a Triton X-100 micelle-interface, followed by doping with phytic acid and carbonization. The unique pore structure and defect-rich framework of the HCNs expose numerous active sites. Crucially, the combined effect of graphitic nitrogen and phosphorus-carbon bonds modulate the local electronic structure of adjacent C atoms and facilitates electron transfer. As a result, the HCN carbonized at 1100 °C exhibited superior HER activity and an outstanding stability (70 h at a current density of 10 mA cm−2) in alkaline water, because of the large number of graphitic nitrogen and phosphorus-carbon bonds.
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设计经济高效的无金属碳基析氢反应催化剂,对提高碱水电解制氢效率具有重要意义。杂原子掺杂对电子结构的精确控制已被证明是提高催化活性的有效方法。然而,无论是结构特征和潜在的机制都不太清楚,特别是掺杂两种不同的原子,从而限制了这些催化剂的使用。本文报道了吡咯和苯胺在Triton X-100胶束界面上共聚,然后掺杂植酸和碳化制备磷氮共掺杂空心碳纳米球(HCNs)。hcn独特的孔隙结构和富含缺陷的框架暴露了许多活性位点。至关重要的是,石墨氮和磷碳键的联合作用调节了相邻C原子的局部电子结构,促进了电子转移。结果表明,在1100℃下碳化的HCN在碱性水中表现出优异的HER活性和出色的稳定性(在10 mA cm−2电流密度下70 h),这是因为石墨氮和磷碳键的大量存在。下载:下载高清图片(98KB)下载:下载全尺寸图片
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New Carbon Materials
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