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1.
Atomically Thin Mesoporous Co3O4 Layers Strongly Coupled with N‐rGO Nanosheets as High‐Performance Bifunctional Catalysts for 1D Knittable Zinc–Air Batteries
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Yingbo Li Cheng Zhong Jie Liu Xiaoqiao Zeng Shengxiang Qu Xiaopeng Han Yida Deng Wenbin Hu Jun Lu 《Advanced materials (Deerfield Beach, Fla.)》2018,30(4)
Under development for next‐generation wearable electronics are flexible, knittable, and wearable energy‐storage devices with high energy density that can be integrated into textiles. Herein, knittable fiber‐shaped zinc–air batteries with high volumetric energy density (36.1 mWh cm?3) are fabricated via a facile and continuous method with low‐cost materials. Furthermore, a high‐yield method is developed to prepare the key component of the fiber‐shaped zinc–air battery, i.e., a bifunctional catalyst composed of atomically thin layer‐by‐layer mesoporous Co3O4/nitrogen‐doped reduced graphene oxide (N‐rGO) nanosheets. Benefiting from the high surface area, mesoporous structure, and strong synergetic effect between the Co3O4 and N‐rGO nanosheets, the bifunctional catalyst exhibits high activity and superior durability for oxygen reduction and evolution reactions. Compared to a fiber‐shaped zinc–air battery using state‐of‐the‐art Pt/C + RuO2 catalysts, the battery based on these Co3O4/N‐rGO nanosheets demonstrates enhanced and stable electrochemical performance, even under severe deformation. Such batteries, for the first time, can be successfully knitted into clothes without short circuits under external forces and can power various electronic devices and even charge a cellphone. 相似文献
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Xuejin Li Yongchao Tang Jiaxiong Zhu Haiming Lv Lianming Zhao Wenlong Wang Chunyi Zhi Hongfei Li 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(31)
Cathodes of rechargeable Zn batteries typically face the issues of irreversible phase transformation, structure collapse, and volume expansion during repeated charge/discharge cycles, which result in an increased transfer resistance and poor long‐term cycling stability. Herein, a facile F doping strategy is developed to boost the cycling stability of nickel cobalt carbonate hydroxide (NiCo–CH) cathode. Benefiting from the extremely high electronegativity, the phase and morphology stabilities as well as the electrical conductivity of NiCo–CH are remarkably enhanced by F incorporation (NiCo–CH–F). Phase interface and amorphous microdomains are also introduced, which are favorable for the electrochemical performance of cathode. Benefiting from these features, NiCo–CH–F delivers a high capacity (245 mA h g?1), excellent rate capability (64% retention at 8 A g?1), and outstanding cycling stability (maintains 90% after 10 000 cycles). Moreover, the quasi‐solid‐state battery also manifests superior cycling stability (maintains 90% after 7200 cycles) and desirable flexibility. This work offers a general strategy to boost the cycling stability of cathode materials for aqueous Zn batteries. 相似文献
4.
Ze-Nong Zhang Qing-Ling Hong Xiao-Hui Wang Hao Huang Shu-Ni Li Yu Chen 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(27):2300530
Nitrate is a reasonable alternative instead of nitrogen for ammonia production due to the low bond energy, large water-solubility, and high chemical polarity for good absorption. Nitrate electroreduction reaction (NO3RR) is an effective and green strategy for both nitrate treatment and ammonia production. As an electrochemical reaction, the NO3RR requires an efficient electrocatalyst for achieving high activity and selectivity. Inspired by the enhancement effect of heterostructure on electrocatalysis, Au nanowires decorated ultrathin Co3O4 nanosheets (Co3O4-NS/Au-NWs) nanohybrids are proposed for improving the efficiency of nitrate-to-ammonia electroreduction. Theoretical calculation reveals that Au heteroatoms can effectively adjust the electron structure of Co active centers and reduce the energy barrier of the determining step (*NO → *NOH) during NO3RR. As the result, the Co3O4-NS/Au-NWs nanohybrids achieve an outstanding catalytic performance with high yield rate (2.661 mg h−1 mgcat−1) toward nitrate-to-ammonia. Importantly, the Co3O4-NS/Au-NWs nanohybrids show an obviously plasmon-promoted activity for NO3RR due to the localized surface plasmon resonance (LSPR) property of Au-NWs, which can achieve an enhanced NH3 yield rate of 4.045 mg h−1 mgcat−1. This study reveals the structure–activity relationship of heterostructure and LSPR-promotion effect toward NO3RR, which provide an efficient nitrate-to-ammonia reduction with high efficiency. 相似文献
5.
Zinc–Air Batteries: Atomically Thin Mesoporous Co3O4 Layers Strongly Coupled with N‐rGO Nanosheets as High‐Performance Bifunctional Catalysts for 1D Knittable Zinc–Air Batteries (Adv. Mater. 4/2018)
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Yingbo Li Cheng Zhong Jie Liu Xiaoqiao Zeng Shengxiang Qu Xiaopeng Han Yida Deng Wenbin Hu Jun Lu 《Advanced materials (Deerfield Beach, Fla.)》2018,30(4)
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Hyun Wook Go Thanh Tuan Nguyen Quynh Phuong Ngo Rongrong Chu Nam Hoon Kim Joong Hee Lee 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(10):2206341
Rechargeable zinc-air batteries (ZABs) are promising energy storage systems due to their low-cost and safety. However, the working principle of ZABs is based on oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), which display sluggish kinetic and low stability. Herein, this work proposes a novel method to design a heterogeneous CoP/CoO electrocatalyst on mesopore nanobox carbon/carbon nanotube (CoP/CoO@MNC-CNT) that enriched active sites and synergistic effect. Moreover, the well-defined heterointerfaces could lower the energy barrier for intermediate species adsorption and promote OER and ORR electrochemical performances. The CoP/CoO@MNC-CNT electrocatalyst presents a high half-wave potential of 0.838 V for ORR and a small overpotential of 270 mV for OER. The ZABs-based CoP/CoO@MNC-CNT air-cathode shows an open-circuit voltage of 1.409 V, the long-term cycle life of 500 h with a small voltage difference change of 7.7%. Additionally, the flexible ZABs exhibit highly mechanical stability, demonstrating their application potential in wearable electronic devices. 相似文献
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An Aqueous Rechargeable Zn//Co3O4 Battery with High Energy Density and Good Cycling Behavior
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Xiaowei Wang Faxing Wang Liying Wang Minxia Li Yanfang Wang Bingwei Chen Yusong Zhu Lijun Fu Liusheng Zha Lixin Zhang Yuping Wu Wei Huang 《Advanced materials (Deerfield Beach, Fla.)》2016,28(24):4904-4911
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Zahra Bayhan Jehad K. El-Demellawi Jian Yin Yusuf Khan Yongjiu Lei Eman Alhajji Qingxiao Wang Mohamed N. Hedhili Husam N. Alshareef 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(36):2208253
MXenes, a fast-growing family of two-dimensional (2D) transition metal carbides/nitrides, are promising for electronics and energy storage applications. Mo2CTx MXene, in particular, has demonstrated a higher capacity than other MXenes as an anode for Li-ion batteries. Yet, such enhanced capacity is accompanied by slow kinetics and poor cycling stability. Herein, it is revealed that the unstable cycling performance of Mo2CTx is attributed to the partial oxidation into MoOx with structural degradation. A laser-induced Mo2CTx/Mo2C (LS-Mo2CTx) hybrid anode has been developed, of which the Mo2C nanodots boost redox kinetics, and the laser-reduced oxygen content prevents the structural degradation caused by oxidation. Meanwhile, the strong connections between the laser-induced Mo2C nanodots and Mo2CTx nanosheets enhance conductivity and stabilize the structure during charge–discharge cycling. The as-prepared LS-Mo2CTx anode exhibits an enhanced capacity of 340 mAh g−1 vs 83 mAh g−1 (for pristine) and an improved cycling stability (capacity retention of 106.2% vs 80.6% for pristine) over 1000 cycles. The laser-induced synthesis approach underlines the potential of MXene-based hybrid materials for high-performance energy storage applications. 相似文献
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Ji Chan Park Shin Wook Kang Jeong-Chul Kim Jae In Kwon Sanha Jang Geun Bae Rhim Mijong Kim Dong Hyun Chun Ho-Tae Lee Heon Jung Hyunjoon Song Jung-II Yang 《Nano Research》2017,(3):1044-1055
A cobalt-silica hybrid nanocatalyst bearing small cobalt particles of diameter ~5 nm was prepared through a hydrothermal reaction and hydrogen reduction.The resulting material showed very high CO conversion (>82%) and high hydrocarbon productivity (~1.0 gHc·g-1cat,·h-11) with high activity (~8.5 x 10-5 molco·g-1Co·S-1) in the Fischer-Tropsch synthesis reaction. 相似文献
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Peng Yu Lei Wang Fanfei Sun Ying Xie Xu Liu Jingyuan Ma Xiuwen Wang Chungui Tian Jinghong Li Honggang Fu 《Advanced materials (Deerfield Beach, Fla.)》2019,31(30)
Developing non‐precious‐metal bifunctional oxygen reduction and evolution reaction (ORR/OER) catalysts is a major task for promoting the reaction efficiency of Zn–air batteries. Co‐based catalysts have been regarded as promising ORR and OER catalysts owing to the multivalence characteristic of cobalt element. Herein, the synthesis of Co nanoislands rooted on Co–N–C nanosheets supported by carbon felts (Co/Co–N–C) is reported. Co nanosheets rooted on the carbon felt derived from electrodeposition are applied as the self‐template and cobalt source. The synergistic effect of metal Co islands with OER activity and Co–N–C nanosheets with superior ORR performance leads to good bifuctional catalytic performances. Wavelet transform extended X‐ray absorption fine spectroscopy and X‐ray photoelectron spectroscopy certify the formation of Co (mainly Co0) and the Co–N–C (mainly Co2+ and Co3+) structure. As the air‐cathode, the assembled aqueous Zn–air battery exhibits a small charge–discharge voltage gap (0.82 V@10 mA cm?2) and high power density of 132 mW cm?2, outperforming the commercial Pt/C catalyst. Additionally, the cable flexible rechargeable Zn–air battery exhibits excellent bendable and durability. Density functional theory calculation is combined with operando X‐ray absorption spectroscopy to further elucidate the active sites of oxygen reactions at the Co/Co–N–C cathode in Zn–air battery. 相似文献
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Jiajia Xia Yurong Zhou Jian Zhang Tianyu Lu Wenbin Gong Dengsong Zhang Xiaona Wang Jiangtao Di 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(37):2301906
Aqueous zinc-ion batteries (ZIBs) have attracted extensive attention in recent years because of its high volumetric energy density, the abundance of zinc resources, and safety. However, ZIBs still suffer from poor reversibility and sluggish kinetics derived from the unstable cathodic structure and the strong electrostatic interactions between bivalent Zn2+ and cathodes. Herein, magnesium doping into layered manganese dioxide (Mg–MnO2) via a simple hydrothermal method as cathode materials for ZIBs is proposed. The interconnected nanoflakes of Mg–MnO2 possess a larger specific surface area compared to pristine δ-MnO2, providing more electroactive sites and boosting the capacity of batteries. The ion diffusion coefficients of Mg–MnO2 can be enhanced due to the improved electrical conductivity by doped cations and oxygen vacancies in MnO2 lattices. The assembled Zn//Mg–MnO2 battery delivers a high specific capacity of 370 mAh g−1 at a current density of 0.6 A g−1. Furthermore, the reaction mechanism confirms that Zn2+ insertion occurred after a few cycles of activation reactions. Most important, the reversible redox reaction between Zn2+ and MnOOH is found after several charge–discharge processes, promoting capacity and stability. It believes that this systematic research enlightens the design of high-performance of ZIBs and facilitates the practical application of Zn//MnO2 batteries. 相似文献
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Carbon Nanotube–CoF2 Multifunctional Cathode for Lithium Ion Batteries: Effect of Electrolyte on Cycle Stability
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Xinran Wang Wentian Gu Jung Tae Lee Naoki Nitta Jim Benson Alexandre Magasinski Mark W. Schauer Gleb Yushin 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(38):5164-5173
Transition metal fluorides (MFx) offer remarkably high theoretical energy density. However, the low cycling stability, low electrical and ionic conductivity of metal fluorides have severely limited their applications as conversion‐type cathode materials for lithium ion batteries. Here, a scalable and low‐cost strategy is reported on the fabrication of multifunctional cobalt fluoride/carbon nanotube nonwoven fabric nanocomposite, which demonstrates a combination of high capacity (near‐theoretical, ) and excellent mechanical properties. Its strength and modulus of toughness exceed that of many aluminum alloys, cast iron, and other structural materials, fulfilling the use of MFx‐based materials in batteries with load‐bearing capabilities. In the course of this study, cathode dissolution in conventional electrolytes has been discovered as the main reason that leads to the rapid growth of the solid electrolyte interphase layer and attributes to rapid cell degradation. And such largely overlooked degradation mechanism is overcome by utilizing electrolyte comprising a fluorinated solvent, which forms a protective ionically conductive layer on the cathode and anode surfaces. With this approach, 93% capacity retention is achieved after 200 cycles at the current density of 100 mA g−1 and over 50% after 10 000 cycles at the current density of 1000 mA g−1. 相似文献
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Yajun Zhao Wenhao Tang Wenhong Liu Xianghua Kong Dawei Zhang Hao Luo Kewei Teng Ruiping Liu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(3):2205532
A major issue with Li-O2 batteries is their slow oxygen reduction and evolution kinetics, necessitating catalysts with high catalytic activity to improve reaction kinetics and cycle stability. Herein, a nano-heterostructured catalyst composed of Co3O4 and Fe2O3 (Co3O4/Fe2O3) with a porous rod morphology is achieved through an interfacial engineering strategy by constructing Fe2O3 on the Co3O4 surface, which can function as a high-performance cathode in order to efficiently encourage the oxygen reduction and evolution while also reduce the battery polarization during charging and discharging. The density functional theory (DFT) calculations show the differences in charge density at the interface of nano-heterostructures, demonstrating the occurrence of an electron transfer process in the interface region of Co3O4 and Fe2O3, implying a strong electronic coupling transfer, and in turn changing the electronic structure of the Co3O4. This significantly reduces the adsorption energy of LiO2 intermediates, thereby effectively lowering the overpotential. The resultant Li-O2 battery has larger discharge specific capacity, lower overpotential for the efficient oxygen evolution/reduction, as well as good cycling stability of 280 cycles. This work demonstrates an effective method to fabricate the nano-heterostrucutred materials with enhanced catalytic efficiency for advanced energy applications. 相似文献
15.
Sampath Prabhakaran Jayaraman Balamurugan Nam Hoon Kim Joong Hee Lee 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(19)
The development of hierarchical nanostructures with highly active and durable multifunctional catalysts has a new significance in the context of new energy technologies of water splitting and metal–air batteries. Herein, a strategy is demonstrated to construct a 3D hierarchical oxygenated cobalt molybdenum selenide (O‐Co1?xMoxSe2) series with attractive nanoarchitectures, which are fabricated by a simple and cost‐effective hydrothermal process followed by an exclusive ion‐exchange process. Owing to its highly electroactive sites with numerous nanoporous networks and plentiful oxygen vacancies, the optimal O‐Co0.5Mo0.5Se2 could catalyze the hydrogen evolution reaction and oxygen evolution reaction effectively with a low overpotential of ≈102 and 189 mV, at a current density of 10 mA cm?2, respectively, and exceptional durability. Most importantly, the O‐Co0.5Mo0.5Se2||O‐Co0.5Mo0.5Se2 water splitting device only entails a voltage of ≈1.53 V at a current density of 10 mA cm?2, which is much better than benchmark Pt/C||RuO2 (≈1.56 V). Furthermore, O‐Co0.5Mo0.5Se2 air cathode‐based zinc–air batteries exhibit an excellent power density of 120.28 mW cm?2 and exceptional cycling stability for 60 h, superior to those of state‐of‐art Pt/C+RuO2 pair‐based zinc–air batteries. The present study provides a strategy to design hierarchical 3D oxygenated bimetallic selenide‐based multifunctional catalysts for energy conversion and storage systems. 相似文献
16.
Co@Co3O4@PPD Core@bishell Nanoparticle‐Based Composite as an Efficient Electrocatalyst for Oxygen Reduction Reaction
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Zhijuan Wang Bing Li Xiaoming Ge F. W. Thomas Goh Xiao Zhang Guojun Du Delvin Wuu Zhaolin Liu T. S. Andy Hor Hua Zhang Yun Zong 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(19):2580-2587
Durable electrocatalysts with high catalytic activity toward oxygen reduction reaction (ORR) are crucial to high‐performance primary zinc‐air batteries (ZnABs) and direct methanol fuel cells (DMFCs). An efficient composite electrocatalyst, Co@Co3O4 core@shell nanoparticles (NPs) embedded in pyrolyzed polydopamine (PPD) is reported, i.e., in Co@Co3O4@PPD core@bishell structure, obtained via a three‐step sequential process involving hydrothermal synthesis, high temperature calcination under nitrogen atmosphere, and gentle heating in air. With Co@Co3O4 NPs encapsulated by ultrathin highly graphitized N‐doped carbon, the catalyst exhibits excellent stability in aqueous alkaline solution over extended period and good tolerance to methanol crossover effect. The integration of N‐doped graphitic carbon outer shell and ultrathin nanocrystalline Co3O4 inner shell enable high ORR activity of the core@bishell NPs, as evidenced by ZnABs using catalyst of Co@Co3O4@PPD in air‐cathode which delivers a stable voltage profile over 40 h at a discharge current density of as high as 20 mA cm?2. 相似文献
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Jiaqi Niu Yuan Liu Xingqi Wang Jiaojiao Liu Zijuan Zhao Xiaoqiang Liu Kostya Ostrikov 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(38):2302727
High-efficiency and low-cost bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as well as gel electrolytes with high thermal and mechanical adaptability are required for the development of flexible batteries. Herein, abundant Setaria Viridis (SV) biomass is selected as the precursor to prepare porous N-doped carbon tubes with high specific surface area and the 900 °C calcination product of SV (SV-900) shows the optimum ORR/OER activities with a small EOER–EORR of 0.734 V. Meanwhile, a new multifunctional gel electrolyte named C20E2G5 is prepared using cellulose extracted from another widely distributed biomass named flax as the skeleton, epichlorohydrin as the cross-linker and glycerol as the antifreezing agent. C20E2G5 possesses high ionic conductivity from −40 to + 60 °C, excellent tensile and compressive resistance, high adhesion, strong freezing and heat resistance. Moreover, the symmetrical cell assembled with C20E2G5 can significantly inhibit Zn dendrite growth. Finally, flexible solid-state Zn–air batteries assembled with SV-900 and C20E2G5 show high open circuit voltage, large energy density, and long-term operation stability between −40 and + 60 °C. This biomass-based approach is generic and can be used for the development of diverse next-generation electrochemical energy conversion and storage devices. 相似文献
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High‐Performance Two‐Ply Yarn Supercapacitors Based on Carbon Nanotube Yarns Dotted with Co3O4 and NiO Nanoparticles
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Yarn supercapacitors are promising power sources for flexible electronic applications that require conventional fabric‐like durability and wearer comfort. Carbon nanotube (CNT) yarn is an attractive choice for constructing yarn supercapacitors used in wearable textiles because of its high strength and flexibility. However, low capacitance and energy density limits the use of pure CNT yarn in wearable high‐energy density devices. Here, transitional metal oxide pseudocapacitive materials NiO and Co3O4 are deposited on as‐spun CNT yarn surface using a simple electrodeposition process. The Co3O4 deposited on the CNT yarn surface forms a uniform hybridized CNT@Co3O4 layer. The two‐ply supercapacitors formed from the CNT@Co3O4 composite yarns display excellent electrochemical properties with very high capacitance of 52.6 mF cm?2 and energy density of 1.10 μWh cm?2. The high performance two‐ply CNT@Co3O4 yarn supercapacitors are mechanically and electrochemically robust to meet the high performance requirements of power sources for wearable electronics. 相似文献
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Naibao Huang Yin Sun Sen Liu Xinyu Wang Junjie Zhang Likui Guo Jiapeng Bi Xiannian Sun 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(35):2300696
Extensive research interest in hybrid battery-supercapacitor (BSH) devices have led to the development of cathode materials with excellent comprehensive electrochemical properties. In this work, carbon nanotube (CNT)-Mn3O4/CoWO4 triple-segment hybrid electrode is synthesized by using a two-step microwave-assisted hydrothermal route. Systematic physical characterization revealed that, with the assistance of microwave, granular Mn3O4 and spheroid-like CoWO4 with preferred orientation, and oxygen vacancies are stacked or arranged on CNTs skeletons to construct a rational designed hybrid nanocomposite with abundant heterointerfaces and interfacial chemical bonds. Electrochemical evaluations show that the synergistic cooperation in CNT-Mn3O4/CoWO4 resulted in an ultra-high specific capacity (1907.5 C g−1/529.8 mA h g−1 at 1 A g−1), a wide operating voltage window (1.15 V), the satisfactory rate capability (capacity maintained at 1016.5 C g−1/282.3 mA h g−1 at 15 A g−1), and excellent cycling stability (117.2% initial capacity retention after 13000 cycles at 15 A g−1). In addition, the assembled CNT-Mn3O4/CoWO4//N doped porous carbon (N C) BSH device delivered a stable working voltage of 2.05 V and superior energy density of 67.5 Wh kg−1 at power density of 1025 W kg−1, as well as excellent stability (92.2% capacity retained at 5 A g−1 for 12600 cycles). This work provides a new and feasible tactic to develop high-performance transition metal oxide-based cathodes for advanced BSH devices. 相似文献