ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yaqing Wei,Jiajun Chen,Siqi Wang,Xingguo Zhong,Rundi Xiong,Lin Gan,Ying Ma,Tianyou Zhai,Huiqiao Li
Many recent efforts on the electrode design for advanced Li-ion batteries (LIBs) are often devoted to increasing the gravimetric capacity, but little attention is paid to the volumetric capacity which is more critical for practical application. Though the alloying-type anode materials are quite attractive, the challenge is that they must be composited with a large amount of carbon materials (e.g., GO, rGO, CNT) to buffer their large volume change, which would undoubtedly sacrifice the volumetric energy density of the whole electrode due to the carbon’s low tap density (∼0.05 g/cm3). Herein, we propose the unique layered Sb2Te3, which possesses high conductivity and a large volumetric capacity (3419 mAh/cm3), to be served as the alternative anode for LIBs. Furthermore, we introduce natural graphite, which is low price and with high density (2.25 g/cm3), into Sb2Te3 to successfully build a novel Sb2Te3@Gra composite in which the Sb2Te3 particles are wrapped by graphite layers. Interestingly, this modified Sb2Te3@Gra exhibits much more superior cycle stability (570 mAh/g after 200 cycles, 96% retention) than pure Sb2Te3 (130 mAh/g after 200 cycles, 22% retention), while keeping its original large volumetric capacity output (∼3200 mAh/cm3) at the same time. More specially, it enables a reversible structure recovery of Sb2Te3, guaranteeing the electrode integrity and cyclability. These extraordinary phenomena are investigated in detail, whose results display that the outer graphite layer plays an important role by facilitating the intimate contact with Sb2Te3 particles and protecting them from pulverization. Besides, such graphite layer greatly promotes the electron-transfer during lithiation, helping to improve the rate capability (372 mAh/g at 2000 mA/g, 60% retention). Consequently, the assembled Sb2Te3//LiCoO2 full cell delivers a large capacity of 500 mAh/g, with stable discharge plateau and cycle stability, revealing its high potential 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Peng Chu,Hailei Zhao,Jie Wang,Hongliang Xie,Chongqi Han,Zhao Yang
Negative current collectors play vital roles in the electrochemical performance of liquid metal batteries (LMBs). Employing a three-dimensional (3D) current collector is an effective approach to host molten lithium and reduce the effective current density. The Ni-Fe foam is a frequently used 3D current collector for the negative electrode. However, the corrosion of molten lithium towards the Ni-Fe foam skeleton devastates the 3D structure of the current collector and so deteriorates seriously the electrochemical performance of LMB. To enhance the corrosion resistivity, herein, the graphite layer coated Ni-Fe foam (Graphite@Ni-Fe) is prepared by the chemical vapor deposition method. The prepared scaly-like graphite layer plays a bifunctional role in chemistry, preventing corrosion as an effective barrier and improving remarkably the surface lithiophilicity of Ni-Fe foam. The assembled Li||Bi batteries with Graphite@Ni-Fe foam as negative current collector exhibit stable cycling performance with capacity retention of 98.10% and high Coulombic efficiencies over 98.3% at 0.4 A cm −2 over 100 cycles at 500 °C. More importantly, outstanding rate capability is achieved and almost no capacity degradation is observed upon current density change from 0.2 to 2.0 A cm −2 . This work highlights the importance of the lithiophilicity and the corrosion resistance ability of the negative current collectors for LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xueming Yang,He Chi,Yuan Cao,Jie Cui,Chang Ji,Jianfei Xie
Phase change materials (PCMs) have advantageous energy storage capacity, but their poor shape stability and low thermal conductivity restrict their practical applications in the field of energy storage. In this study, the graphite flakes were adhered to the waste cotton strips, and the cotton strips were rolled up layer by layer to form a cotton-derived porous carbon skeleton after a high temperature carbonization. The graphite flake and the carbonized cotton cloth were connected to each other to forming a good heat conduction path. Composite phase change materials (CPCMs) were successfully prepared by vacuum impregnation of phase change material stearic acid (SA). The results showed that the thermal conductivity of CPCMs can be greatly improved in terms of forming the cotton-derived porous carbon skeleton. When the content of skeleton filler was 26.46 wt%, the normal thermal conductivity of the prepared CPCMs reached 5.51 W/(m·K), which was 21.19 times higher than that of pure stearic acid, along with a photothermal conversion efficiency of 82.6 % and phase change enthalpy of 148.99 J/g. Moreover, the CPCMs demonstrated great shape stability, obvious anti-leakage characteristic and advanced photothermal conversion capacity. The above results show that the CPCMs prepared by this method have broad application prospects in the field of solar thermal storage and thermal management.
研究领域:
能源存储
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhenyu Wang,Jinyang Li,Fuxi Peng,Hanpeng Deng,Jiayang Li,Wei Wei,Zuowan Zhou
It remains a significant challenge to develop a photothermal adsorbent with a heating response as fast as a joule-heating adsorbent and simultaneously possessing excellent mechanical stability and reusability for rapid oil cleaning. Here, we report a novel monolithic design to fabricate a photothermal hybrid sponge for rapid oil cleaning by integrating graphite interlayer compounds as photothermal units into the three-dimensional photothermal network of carbon nanotubes . This unique monolithic design enabled the hybrid sponge to present excellent photothermal performance: firstly, the superhydrophobic hybrid sponge has low thermal resistance resulting from the defectless surface; secondly, the photothermal units were weaved in the photothermal network, preventing detachment in the cycling and providing ultrafast photothermal heating rate. The hybrid sponge rises to 81 °C in merely 25 s under irradiation (1 Sun), superior to most photothermal oil adsorbents reported so far. This study provides a new structural design for constructing photothermal adsorbents with a fast-heating response for rapid crude oil cleaning.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Lin Chen,Qiuyue Duan,Wei Dong,Aodong Zhu,Ao Zhang,Xinxin Zhang,Jie Zhong,Fuzhi Huang,Yi-bing Cheng,Junyan Xiao
As an alternative of evaporated metal top electrode in perovskite solar cells , the transferred top electrode technique has the outstanding advantage of simple process. And in the case of carbon based transferred top electrode, the efficiency of corresponding perovskite devices can be higher than 20%. During the solid-to-solid electrode transferring process, it is essential to achieve effective contact and to avoid damage of bottom functional layers for an improved device performance. In this work, a sprayed graphite layer on conductive substrate is employed as transferred top electrode for perovskite solar cells. A simple mechanical polishing treatment is further adopted to modify the surface status of graphite layer. Compared with as sprayed graphite electrode , polished electrode shows better electrical property and optimized interface contact with hole-transporting layer. Thus, the average efficiency of perovskite device with mechanical modified electrode can significantly increase from 16.3% to 19.2%.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Yangzhi Bai,Baolian Yi,Jia Li,Shangfeng Jiang,Hongjie Zhang,Zhigang Shao,Yujiang Song
The development of a non-precious metal electrocatalyst (NPME) with a performance superior to commercial Pt/C for the oxygen reduction reaction (ORR) is important for the commercialization of fuel cells. We report the synthesis of a NPME by heat-treating Co-based metal organic frameworks (ZIF-67) with a small average size of 44 nm. The electrocatalyst pyrolyzed at 600 °C showed the best performance and the performance was enhanced when it was supported on BP 2000. The resulting electrocatalyst was composed of 10 nm Co nanoparticles coated by 3–12 layers of N doped graphite layers which as a whole was embedded in a carbon matrix. The ORR performance of the electrocatalyst was tested by rotating disk electrode tests in O 2 -saturated 0.1 mol/L KOH under ambient conditions. The electrocatalyst (1.0 mg/cm 2 ) showed an onset potential of 1.017 V (vs. RHE) and a half-wave potential of 0.857 V (vs. RHE), which showed it was as good as the commercial Pt/C (20 μg Pt /cm 2 ). Furthermore, the electrocatalyst possessed much better stability and resistance to methanol crossover than Pt/C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Luo Zhishan,Wan Qiang,Yu Zhiyang,Lin Sen,Xie Zailai,Wang Xinchen
Styrene is one of the most important industrial monomers and is traditionally synthesized via the dehydrogenation of ethylbenzene. Here, we report a photo-induced fluorination technique to generate an oxidative dehydrogenation catalyst through the controlled grafting of fluorine atoms on nanodiamonds. The obtained catalyst has a fabulous performance with ethylbenzene conversion reaching 70% as well as styrene yields of 63% and selectivity over 90% on a stream of 400 °C, which outperforms other equivalent benchmarks as well as the industrial K−Fe catalysts (with a styrene yield of 50% even at a much higher temperature of ca. 600 °C). Moreover, the yield of styrene remains above 50% after a 500 h test. Experimental characterizations and density functional theory calculations reveal that the fluorine functionalization not only promotes the conversion of sp 3 to sp 2 carbon to generate graphitic layers but also stimulates and increases the active sites (ketonic C=O). This photo-induced surface fluorination strategy facilitates innovative breakthroughs on the carbocatalysis for the oxidative dehydrogenation of other arenes.
研究领域:
化学工程
·
材料科学
·
催化
·
有机化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Katam Srinivas,Zhuo Chen,Anran Chen,Fei Ma,Ming-qiang Zhu,Yuanfu Chen
The development of efficient single-atom catalysts (SACs) for the oxygen reduction reaction (ORR) remains a formidable challenge, primarily due to the symmetric charge distribution of metal single-atom sites (M-N 4 ). To address such issue, herein, Fe-N x sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution, thus enhancing the intrinsic catalytic activity. Precisely, atomically dispersed Fe-N x sites supported on N/S-doped mesoporous carbon (NSC) coupled with FeS@C core-shell nanoparticles (FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent pyrolysis. Due to the presence of an in situ-grown conductive graphitic layer (shell), the FeS nanoparticles (core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling interactions. Consequently, FAS-NSC@950 displays a more positive half-wave potential ( E 1/2 ) of 0.871 V with a significantly boosted ORR kinetics (Tafel slope = 52.2 mV dec −1 ), outpacing the commercial Pt/C ( E 1/2 = 0.84 V and Tafel slope = 54.6 mV dec −1 ). As a bifunctional electrocatalyst, it displays a smaller bifunctional activity parameter (Δ E ) of 0.673 V, surpassing the Pt/C-RuO 2 combination (Δ E = 0.724 V). Besides, the FAS-NSC@950-based zinc-air battery (ZAB) displays superior power density, specific capacity, and long-term cycling performance to the Pt/C-Ir/C-based ZAB. This work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR, with potential implications for energy conversion and storage technologies.
研究领域:
电化学
·
材料科学
·
能量转换与存储
✓ 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）