JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Xiaojian Jiang,Yuyan Wang,Lishan Yang,Dongwei Li,Huayun Xu,Yi Ding
Mn-contained nano-flowers can be fabricated by dealloying Mn/Al alloys in aqueous NaOH solution in the presence of H 2 O 2 , and upon annealing the resulted samples exhibit a hierarchically porous MnO x microsphere morphology composed of nanoparticles of MnO and Mn 3 O 4 . When tested as anode materials for lithium ion batteries , those MnO x microspheres exhibit a high specific capacity of 1018, 901 and 757 mAh g −1 with nearly 100% retention capacity after 100 cycles at 100, 200 and 500 mA g −1 , respectively. The enhanced storage capacity, impressive cycling performance, and good rate capability for the electrodes are ascribed to the porous structures for buffering the volume change during the discharge/charge processes, and the nano-hybrids for enhancing electronic and ionic transport in the electrode materials .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Yu Wei,Meng Chen,Sheng Guo,Yao Li,Zhenyu Zhang,Yin Xie,Chao Cai,Qingsong Wei
Hierarchically porous photocatalysts exhibit superior light-harvesting capacity and enhanced photocatalytic activity. In this work, a facile method by combining additive manufacturing (AM) and dealloying was employed to prepare a hierarchically porous photocatalyst, namely, nanoporous-TiO2-encapsulating macroporous-double-gyroid-structure photocatalyst (TiO2@DGS). It was found that TiO2@DGS possessed deterministic macropores and interconnected nanopores, which offered efficient mass transfer channels and abundant active sites, respectively. Thus, TiO2@DGS showed excellent photocatalytic capability under ultraviolet–visible (UV–vis) light irradiation and achieved a tetracycline degradation efficiency of over 90% within 60 min (photocatalytic rate constant k = 4.0 × 10–2 min–1). Furthermore, TiO2@DGS exhibited excellent durability and reusability due to its stable three-dimensional structures. This work not only exemplifies the high performance of the prepared TiO2@DGS for environmental remediation but also provides an innovative approach to introduce tailored macrostructures into hierarchically porous photocatalysts through the incorporation of AM and dealloying.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2018
·Vol. 8
·期 4
·252
·
IF 1.704
Zhifeng Wang,Xiaomin Zhang,Yongguang Zhang,Man Li,Chunling Qin,Zhumabay Bakenov
CuS is a metal sulfide anode material used in constructing lithium ion batteries (LIBs) with great promise. However, its practical application is limited by rapid capacity decline, poor cycling, and rate performance. In this work, the CuS nanowire-on-nanoplate network is synthesized through an improved dealloying method under two contrasting reaction temperatures. When used as an LIB anode, the as-obtained CuS network exhibits superior cycling performance (420 mAh·g−1retained after 100 cycles at 0.2 C). When at 3 C, it still delivers a capacity of around 350 mAh·g−1. The improved electrochemical performances of the CuS anode should be attributed to the well-designed nanowire-on-nanoplate network structure in which the introduction of nanowires improves Li storage sites, shortens Li-ion diffusion distance, enhances the conductivity of active materials, and offers multiscale spaces for buffering the volume variation. The fabrication route adopted in this paper has an important significance for developing the dealloying technique and designing more suitable anode structures for LIBs.Keywords:dealloying;CuS;anode;Li-ion battery;metallic glass
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Li Cao,Min Zheng,Jingbo Wang,Songyuan Li,Jiejie Xu,Rongshi Xiao,Ting Huang
Nanosized alloy-type materials (Si, Ge, Sn, etc.) present superior electrochemical performance in rechargeable batteries. However, they fail to guarantee cycling capacity and stability under high mass loading required by industrial applications due to low electric contact and adhesive strength, which has long been a challenge. This work proposes a rational design for an alloy-type anode via facile and versatile laser microcladding and dealloying. The proposed anode features a large-area porous network composed of continuous nano-ligaments, which consist of evenly distributed nanosized alloy-type material metallurgically bonded with conductive material. The fabrication of the structure is validated using Ge–Cu and Sn–Cu anodes, both exhibiting enhanced cycling stability at high areal capacity and rate performance in lithium-ion batteries. The enhancement is attributed to the structural features, which contribute to lithiation–delithiation stability and intact electron/Li ion transference path, as verified by in situ and ex situ transmission electron microscopy observations. More importantly, the critical solidification conditions of laser microcladding are provided by a multiphysics simulation, allowing for a thorough understanding of the structural formation mechanism. The study provides a possible approach to improve mass loading and performance of an alloy-type anode for practical application.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhuxu Xu,Adelakun Moses Erinomo,Zhenhua Dan,Fengxiang Qin,Hui Chang
Accurate and sensitive surface-enhanced Raman scattering (SERS) substrates are urgently demanded for the various analytic techniques. The SERS substrates with multimodal and gradient porous structure, utilized for the Rhodamine 6G (R6G) detection, have been designed and successfully fabricated from the thermal diffusion couples of Al and Cu foils via chemical dealloying. The structural inheritance of the initial microstructure of thermal diffusion couple precursors governs the formation of the final layer-by-layer gradient porous Cu with different characteristic pore sizes and morphology. An outmost surface layer of disordered lipstick-like porous structure on the SERS substrates enhances SERS effects as has been expected. The SERS activity of R6G Raman probes on gradient porous Cu is evaluated as a SERS enhancement factor of 6.63 × 10 12 and limit of detection of 2.10 × 10 −17 mol/L, higher than other porous SERS substrates. Meanwhile, the present SERS substrates are flexible and exhibit good bending properties due to the unreacted Cu layer as a supporting skeleton and other gradient porous Cu layers. The superior SERS performances are considered to result from the synergetic effects of the surface scattering of porous Cu rods and enhancements of the high electromagnetic fields between the small gaps between the nanopores.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2015
·
IF 10.325
Shuai Liu,Jinkui Feng,Xiufang Bian,Yitai Qian,Jie Liu,Hui Xu
For the first time nanoporous germanium (np-Ge) was prepared by chemical dealloying allowing for mass production of electrodes for LiBs. Nanoporous structure can accommodate volume changes during the lithiation/de-lithiation progress and promote high-rate capability. The np-Ge shows a promising electrochemical performance as an advanced anode materials for LIBs with a specific capacity of 1191 mA h g −1 after 160 cycles at a rate of 160 mA g −1 and good rate capability.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhichao Shang,Man Zhang,Jingjing Qu,Sanjith Udayakumar,Xintan Bai,Xiaohong Wang,Baojing Zhang,Jianzhong Wang,Farshid Pahlevani,Peizhong Feng
Chemical/electrochemical dealloying was applied to porous CoAl intermetallic (IMC) precursors synthesized via a rapid thermal explosion (TE) method, producing Co 3 O 4 (O V ) self-supported materials with rod-like, nano-flower, and honeycomb-like nanostructures. The investigation thoroughly explored the phase composition, exothermic behavior, precursor morphology, electrochemical characteristics of the dealloyed products, and the mechanism of oxygen vacancies that influence the performance of supercapacitors. The diffusion of intermediate phases governs the exothermic behavior and structural integrity of the CoAl IMC precursors, formatting a precursor with a porous material featuring a 3D microstructure. The effect of dealloying time, temperature and, applied potential on the nanostructure of the sample was examined, ultimately enabling the controlled synthesis of nano-flower Co 3 O 4 (O V ) in the dealloying process. The synthesized self-supported Co 3 O 4 (O V ) materials with a relatively high concentration of oxygen vacancies and a high specific surface area (36.69 m²/g). The materials showed high capacitance (11.25 F/cm 2 at 10 mA/cm 2 ) and exceptional cyclic stability (the decay rate per cycle is 0.013 % at 20 mA/cm 2 after 2000 cycles). DFT simulations demonstrated that the O V creates additional unsaturated coordination sites, enhancing the storage capacity by facilitating ion insertion and extraction, thus significantly boosting the specific capacity.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 43
·2003838
·
IF 16.836
Xuan Wu,Wei Zhang,Naiqi Wu,Su-Seng Pang,Guang He,Yi Ding
The exploration of advanced electrode materials with appropriate structures and compositions is the primary task for nonaqueous potassium ion batteries (PIBs). Herein, 3D nanoporous CuBi anodes are fabricated through a facile chemical dealloying process. The ligaments of this nanoporous alloy are composed of interconnected Bi serving as the active material and Cu decoration as a highly conductive matrix. Such a typical bicontinuous ligament-channel structure is beneficial to overcome the slow K-ion diffusion kinetics as well as electrode expansion on cycling, as evidenced by the high discharge capacity and good rate capability in PIBs. Potassium storage mechanisms in the Bi anodes are investigated through combined techniques to identify the multiple step postassiation process and the charge/discharge products at each stage. Furthermore, it is the first time to report the irreversible phase transition of KBi 2 →Bi upon charge, which seems associated with the ligament pulverization process. These results provide critical insights into the capacity degradation mechanisms of Bi anodes in PIBs. Also, dealloying is proved to be an efficient technology for the rational design of metal/alloy materials for high performance PIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Mingjie Xu,Ye Xiao,Jingxi Zhang,Yuting Xia,Tianli Liu,Yanhao Dong,Chang-An Wang
Pt-based alloys are important catalysts in fuel cells, especially for the oxygen reduction reaction (ORR). A key problem to be addressed is to develop high-activity ORR catalysts with low Pt loading or, equivalently, to increase the catalytic activity per Pt amount. Here, we report a Pt–Co alloy catalyst with Pt-enriched skin and a Pt–Co core structure via microwave activation and ethylene glycol reduction. The synthesis route is efficient and controllable, resulting in highly active catalysts with a fine particle size and narrow size distribution. The synthesized catalysts show significant advantages in ORR activity compared to commercial catalysts. We proposed that the improved activity and stability are due to a Pt-enriched surface of the Pt3Co catalysts, and such a surface structure is dynamically formed via selective etching of Co during nonequilibrium synthesis under the harsh environment of acid, ethylene glycol reduction, and microwave treatment.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Lijie Zou,Mingyuan Ge,Jianming Bai,Chonghang Zhao,Hao Wang,Xianghui Xiao,Hui Zhong,Sanjit Ghose,Wah-Keat Lee,Qiang Shen,Fei Chen,Yu-chen Karen Chen-Wiegart
Multiscale porous metals with multiscale porosity from nanometer to micrometer have a high specific surface area and high effective diffusivity for ion transport, thereby enhancing functionalities and extending the applications of porous metals. In this study, the Cu–Fe–Al ternary system was selected as the precursor alloy to construct multiscale, bimodal porous copper by the chemical dealloying method. The effect of the phase composition and initial microstructure of precursor alloys (AlxFe75–xCu25, x = 10–60) on the three-dimensional (3D) morphology of multiscale porous metals was systematically investigated, with a goal to precisely control the multiscale porous structure. The four crystal structure phases (body-centered cubic (BCC), face-centered cubic (FCC), CsCl type (B2), and monoclinic) in precursor alloys were analyzed by synchrotron X-ray diffraction refinement. The 3D morphology, feature size distribution, and tortuosity of four representative porous Cu after dealloying AlxFe75–xCu25 (x = 10, 30, 50, and 60) precursor alloys were directly visualized and quantified via advanced synchrotron X-ray nanotomography. The relationship between the phases/crystal structures of precursor alloys and their corresponding porous morphology was established: the micron-sized pores in bimodal porous Cu are formed by dissolving the CuFeAl phase with BCC and monoclinic crystal structures, and the nano-sized pores are formed by dealloying the CuFeAl phase with FCC and B2 crystal structures. The size of the nanoporous structure depends on the ratio between the more noble and more active components in the precursor alloy, while the size of the microporous structure depends on the corresponding phase size in the precursor alloy. The tortuosity results showed that the multiscale porous structure with both nanoporosity and microporosity exhibits lower tortuosity, which will enhance transport properties for functional applications.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
Advanced Energy Materials
·
2021
·Vol. 11
·期 7
·2003082
·
IF 29.368
Xuan Wu,Wei Zhang,Naiqi Wu,Su-Seng Pang,Yi Ding,Guang He
Dealloying is a powerful technology to fabricate nanoporous materials with tunable structures and compositions for battery applications. Meanwhile, electrochemical dealloying is an intrinsic process for metal anodes that exhibits fundamental correlations with electrode morphologies and structures. In this work, Li-Ag composites are fabricated as a case study to understand the spontaneous structural evolution and the in situ formation of nanoporosity during a reversible lithiation/delithiation process. The rationally designed nanoporous AgLi (NPAgLi) framework with limited Li capacity (10 mAh cm −2 ) enables a dendrite-free anode with marginal volume variation upon long-term cycling, which can be attributed to the spatially confined reaction pattern along with efficient Li alloying/dealloying. Furthermore, full cell tests reveal the NPAgLi anode remains stable under practical conditions such as lean electrolyte (15 µL), large areal capacity (1.6 mAh cm −2 ), and high-loading cathode (12 mg cm −2 ). This work provides new perspectives on the in situ structural evolution of Li-rich alloy electrodes and the results are expected to contribute to the development of alkali metal anodes.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zhuojie Xiao,Yangcheng Jiang,Hao Wu,Huichi Zhong,Huiyu Song,Ali Abdelhafiz,Jianhuang Zeng
Proton exchange membrane fuel cell is a viable technology for clean energy production, however developing a cost-effective and highly efficient catalyst for oxygen reduction reaction (ORR) is a challenge to overcome. A promising strategy is alloying Pt with transition metals where synergistic effects and strain induced on Pt adatoms can lead to unprecedent activity. Controlling alloy composition and particle structure are highly complex as alloying order increases. Herein, we report a facile and simple one-pot synthesis method, to synthesize carbon-supported PtCuFe nanoparticles surpassing DOE technical requirement of ORR catalyst for PEMFC application. After voltammetric dealloying, a Pt-rich shell is exposed on the surface of the PtCuFe nanoparticles. The elemental composition and electronic environment of PtCuFe nanoparticles are characterized using high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The condition of dealloying affects catalytic activity for ORR. Dissolution of non-noble metals exhibits significant improvement of PtCuFe ORR activity, as well as, an enhancement in their stability. D -Pt 2 CuFe/C-150 catalyst shows an ORR mass activity of 0.99 A mg −1 Pt at 0.90 V vs. RHE, records 2.9 fold enhancement over state-of-the-art commercial TKK catalyst. Furthermore, D -Pt 1 CuFe/C-150 exhibits prolonged stability, with a mass activity loss of only 7.6% after 5000 durability cycles, whereas TKK catalyst suffers for a 29.4% loss under the same conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）