JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·116518
·
IF 4.316
Peipei Li,Dan Cheng,Xiaohua Zhu,Meiling Liu,Youyu Zhang
Compared with the traditional Haber-Bosch process, electrochemical N2 to NH3 reduction affords an eco-friendly and sustainable alternative to ambient NH3 synthesis with the aid of efficient electrocatalysts. In this work, partial oxidation of MnS to obtain the MnS-Mn3O4 is proved as a promising noble-free electrocatalysts of N2 to NH3 fixation at ambient conditions. When tested in 0.1 M Na2SO4, the electrochemical N2 reduction reaction performance of MnS-Mn3O4 is improved comparing with the MnS, which achieves large NH3 yield of 16.74 μg h–1 mgcat.–1 and a high Faradaic efficiency of 5.72%. It also exhibits excellent selectivity of N2 to NH3 and strong long-term electrochemical stability.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Yi Li,Shan Yu,Dmitry E. Doronkin,Shiqian Wei,Meng Dan,Fan Wu,Liqun Ye,Jan-Dierk Grunwaldt,Ying Zhou
As an important byproduct during natural gas exploitation, green utilization of hydrogen sulfide (H 2 S) by photocatalysis has offered us the possibility for production of clean hydrogen (H 2 ) from H 2 S with low energy consumption. In this work, we have successfully introduced well-dispersed palladium sulfide (PdS) which is preferably loaded on In 2 S 3 of MnS/In 2 S 3 composite for improved photocatalytic hydrogen evolution from H 2 S aqueous solution. In contrast to binary MnS/In 2 S 3 , ternary MnS/In 2 S 3 /PdS has exhibited a remarkable and stable hydrogen production rate of 22.7 mmol g −1 h −1 with an apparent quantum yield of 34% at around 395 nm. A comprehensive structure characterization of the ternary composite including scanning transmission electron microscopy (STEM) and X-ray absorption spectroscopy (XAS) in combination with theoretical calculations confirm the good dispersion of PdS in the composite. Moreover, we discovered that PdS preferably interact with In 2 S 3 rather than MnS in the composite through Pd-S-In bond on the interface of the two. Photoluminescence (PL) spectra, surface photovoltage (SPV) spectra together with transient photocurrent and electrochemical impedance spectra (EIS) demonstrate the advantage of PdS for promoting the charge separation. This work sheds light on the positive effect on the enhanced activity of the corresponding system resulting from the preferable anchoring of highly dispersed PdS on In 2 S 3 in the composite by chemical Pd-S-In bond. Not only the high dispersion but also the preferable anchoring of the co-catalyst in the composite could hence inspire people for more rational designs of ternary composite in future.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2024
·
IF 10.8
Chen Liang,Mingxu Chen,Dongbing Jiang,Pengkun Hou,Deqiang Zhao,Shoude Wang,Ziyuan Yu,Piqi Zhao,Lingchao Lu
Developing hydrophobic agents that minimize the strength loss of bulk hydrophobic cementitious materials (BHCM) remains a formidable challenge. Substances such as siloxanes can hinder cement mineral hydration and prevent the formation of an initial network structure during the early hydration stages. In this study, a novel hydrophobic emulsion in which polydimethylsiloxane (PDMS) wrapped with modified nano silica (MNS) is designed to enhance the hydrophobic property of cementitious materials while minimizing strength loss. The results show that BHCM exhibits good hydrophobicity (water contact angle 121.8°) while significantly reducing strength loss (decreased by 10.3 %). The presence of MNS effectively shields PDMS from direct contact with cement minerals during the initial stages. Moreover, MNS can react with portlandite (CH) to generate C-S-H phase and optimize the pore structure of hardened cement pastes. This study contributes to promoting the structure-function integration of cement composites and achieving an extended service life for concrete.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Resources Conversion
·
2022
·
IF 0
Abiola Ganiyat Olatoye,Jie Zhang,Qianyu Wang,Erping Cao,Wenli Li,Emmanuel Oluwaseyi Fagbohun,Yanbin Cui
In the present work, nanoporous carbon (NPC) was prepared from a metal–organic framework (zeolite imidazolate framework 8, ZIF-8). Different concentrations of graphene oxide (GO) were used to make NPC/reduced graphene oxide (NPC/rGO-x, x = 0.5, 1.0, 1.5, and 2.0) composites, and then γ-MnS/NPC/rGO-1 composite was synthesized via a simple hydrothermal technique. The electrochemical characteristics of porous carbon composites (NPC/rGO-x) and γ-MnS/NPC/rGO-1 electrodes were investigated by galvanostatic charge and discharge, cyclic voltammetry, and electrochemical impedance spectroscopy. NPC/rGO-1 showed the highest specific capacitance of 207 F/g at 0.5 A/g. Also, the γ-MnS/NPC/rGO-1 electrode demonstrates exceptional electrochemical performance with a high specific capacitance of 300 F/g at 0.5 A/g and impressive cyclic stability of 70% capacitance retention after 10,000 cycles at 1 A/g. As a result, this study demonstrates that γ-MnS/NPC/rGO-1 electrode can be considered a promising candidate for high-performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ming Zhao,Shan Zhang,Jian Lin,Weihua Hu,Chang Ming Li
The high overpotential of oxygen evolution reaction (OER) is the main limitation of electrolytic water splitting efficiency for hydrogen production . Herein, Fe doped Ni 3 S 2 /MnS heterostructured nanosheets were grown on Ni foam (Fe-Ni 3 S 2 /MnS@NF) via a simple one-step solvothermal reaction. As-synthesized Fe-Ni 3 S 2 /MnS@NF exhibits excellent OER electrocatalytic activity in 1 M KOH, with an extremely low overpotential of 259 mV at 50 mA cm −2 as well as a small Tafel slope (39 mV dec −1 ), much better than Ni 3 S 2 -, Fe-doped Ni 3 S 2 -, and Ni 3 S 2 /MnS- nanosheets grown on NF. Results clearly reveal that the better electrocatalytic performance of Fe-Ni 3 S 2 /MnS@NF than its rivals is mainly due to the synergistic effect of Fe-doping and Ni 3 S 2 /MnS heterojunctions. In details, heterojunction combination with Fe-doping not only improves the conductivity of catalysts but also modulates the electronic configuration of active sites and optimizes the adsorption capacity of oxygen-containing intermediates, thus achieving rapid reaction kinetics and high electrocatalytic performance. This work provides insights into the synergistic regulation of electrocatalytic activity of non-noble catalysts toward high efficiency energy conversion.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 25
·期 9
·2201526
·
IF 4.122
Xiaoyu Tian,Yueyue Wang,Jingjing Wang,Zhonglu Guo,Long Hu,Chengchun Tang,Guifeng Chen,Yi Fang
As a typical 2D transition metal dichalcogenide (TMD), molybdenum disulfide (MoS 2 ) has received widespread attention in the field of microwave absorption (MA). However, pure MoS 2 still has disadvantages in achieving the target of excellent MA performance due to its weak ability in electromagnetic wave (EMW) energy attenuation, in addition to the complicated preparation process of MoS 2 -based composites. It is highly significant to develop functionalized MoS 2 with a low-cost, high-efficiency, and facile preparation process. Herein, a novel core–shell MnS@MoS 2 composite with spherical flower-like structure is developed by a one-pot hydrothermal method. The morphological and performance characterization demonstrates the existence of numerous heterogeneous interfaces, which dramatically enhance the dielectric loss capability of the composites. By adjusting the ratio of Mo 4+ and Mn 2+ , the minimum reflection loss (RL min ) of MnS@MoS 2 -40 composite reaches −65.19 dB and the effective absorption bandwidth (EAB) reaches 6.72 GHz. At the same time, MnS@MoS 2 -60 composite can achieve the RL min value of −53.58 dB and an EAB of up to 6.16 GHz (from 11.44 to 17.6 GHz) at a thickness of only 1.78 mm. These outstanding performances are based on microwave absorbers formed by transition metal sulfide heterojunctions, pioneering the first combination of α-MnS and MoS 2 for MA applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 12
·5416-5426
·
IF 3.5
Xuan Liao,Xiaolong Hou,Caini Yi,Guimiao Wang,Shuo Wang,Ying Yang,Changguo Chen,Danmei Yu,Yuping Liu,Xiaoyuan Zhou
The development of an electrochemical energy storage system with exceptional performance is an important way to address the energy crisis and environmental pollution of the modem world. In this study, an NiCo2O4@MnS composite with a unique hierarchical structure has been successfully synthesized on an NF substrate using the hydrothermal–electrodeposition method. The results indicate that NiCo2O4@MnS possesses superior specific capacitance and excellent cycling stability. At a current density of 2 A g−1, its specific capacitance can reach 2100 F g−1, while the capacitance retention is still 76% after 10 000 cycles at 10 A g−1. Moreover, when the current density is 1 A g−1, the assembled NiCo2O4@MnS//AC device can deliver a specific capacitance of 203 F g−1, and the energy density is up to 55 W h kg−1 at a power density of 697 W kg−1. These outstanding electrochemical properties of NiCo2O4@MnS can be ascribed to the increase in ion diffusion, specific surface area and electronic conductivity due to its unique hierarchical structure and introduction of MnS.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Lizhong He,Zengpeng Guo,Najeeb ur Rehman Lashari,Gexi Wang,Mengbin Li
To cater to the mushrooming advanced energy storage devices need, designing and preparing novel electrode materials with excellent electrochemical properties (including high capacitance and prominent cycling stability) are urgent but challenging. Here, we successfully synthesized 3D hierarchical NiCo 2 O 4 @Co 3 S 4 @MnS@PPy (NC@CS@MS@PPy) core-sheath nanowire arrays grown on highly conductive carbon cloth using a multistage process. Owing to a lot of synergy between the multiple components in the as-obtained composite, the prepared electrode material indicates an excellent specific capacitance of 2.67 F cm −2 at 1 mA cm −2 or 2557.58 F g −1 at 1 A g −1 and high cycling stability (83.64 % capacitance retention after 20,000 cycles even at a high current density of 20 mA cm −2 ). When coupled with the activated carbon (AC, as a negative electrode), the assembled all-solid-state NC@CS@MS@PPy//AC asymmetric supercapacitor (ASC) device showed outstanding electrochemical properties with a high area specific capacitance 684.38 mF cm −2 at 3 mA cm −2 and better long-term cycling stability (96.76 % retention of the initial capacitance after 20,000 cycles). More importantly, by taking advantaging of the multiple compositional merits and structural features of the positive electrode , the device delivered the highest energy density of 81.1 Wh kg −1 at 800 W kg −1 and retained 26.2 Wh kg −1 at the highest power density of 16 KW kg −1 . Furthermore, two ASCs connected in series powered 20 red light-emitting diodes (LEDs) for >10 min. This work manifests that the prepared hierarchical NC@CS@MS@PPy core-sheath nanowire arrays have impressive potential as high-performance electrodes for supercapacitor.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Kaiyue Chen,Xingkun Wang,Canhui Zhang,Ren Xu,Huanlei Wang,Lei Chu,Minghua Huang
Breakthroughs in the design of robust bifunctional oxygen reduction/evolution reaction (ORR/OER) catalysts could put Zn–air batteries performance to the summit but remain full of challenges. In this work, the MnS phase was deliberately introduced into the Mott–Schottky Co/Co 9 S 8 for engineering a three-phases Co/Co 9 S 8 /MnS heterojunction on defect-rich N-doped mesoporous carbon substrate (Co/Co 9 S 8 /MnS-NMC). It affords abundant three-phases heterostructure interfaces that effectively accelerate the electron transfer and trigger further electronic structure reconfiguration, thus advancing the bifunctional ORR/OER activities. Benefiting from these structures, the Co/Co 9 S 8 /MnS-NMC possesses a half-wave potential of 0.84 V toward ORR and a low overpotential of 330 mV toward OER at a current density of 10 mA/cm 2 , catching up with those of commercial Pt/C and RuO 2 catalysts. It also endows the Zn–air batteries with a good power density, round-trip efficiency, and robust stability over 750 h, showcasing the promising potential in practical applications. This work not only provides a facile strategy to construct the three-phases heterojunction catalysts but also sheds light on developing the efficient and robust nonprecious metal-based bifunctional ORR/OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2016
·
IF 2.299
Hui Xu,Xiaohui Chen,Saihu Pan,Yong Qin,Xiaosong Chen,Yongxin Tao,Yong Kong
Sulfur and nitrogen codoped three-dimensional graphene-MnS (MnS/S,N-3DG) hybrids are facilely synthesized via a hydrothermal method followed by freeze-drying and pyrolysis treatment. The obtained MnS/S,N-3DG as an electrocatalyst for oxygen reduction reaction (ORR) shows excellent electrocatalytic performance. The codoped S and N as well as the introduced MnS significantly promote the electrocatalytic activity of graphene and efficiently catalyze the ORR process through a mixture of two-electron transfer pathway and four-electron transfer pathway (electron transfer number equals to 3.8 or 3.9), which is even better than the commercial Pt (5%)/C catalyst. Moreover, the developed MnS/S,N-3DG electrocatalyst possesses excellent long-term stability and methanol tolerance, and could be a promising cathode electrocatalyst in future energy conversion and storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 15
·7156-7169
·
IF 2.302
He Suyu,Qiu Weiwei,Wang Liheng,Gao Feng,Wang Wei,Hu Zhengshui,Wang Qingxiang
Monodispersed hollow MnS nanospheres have been prepared through a solvothermal method using an imidazoline derivative as the morphology-directing reagent. The composition and morphology of synthesized MnS were characterized by powder XRD, SEM, and TEM. The MnS nanospheres were then mixed with chitosan and used as an immobilization matrix for redox protein of hemoglobin. UV–vis and FT-IR spectra showed that the configuration of hemoglobin in the composite film was well maintained. Electrochemical experiments demonstrated that the charge transfer process of Hb was greatly promoted by the MnS. The modified electrode also showed good electrocatalysis toward hydrogen peroxide with the linear range from 0.8 to 15.2 µM. The detection limit and Michaelis–Menten constant were determined to be 0.092 and 4.33 µM, respectively. When the biosensor was utilized for the detection of hydrogen peroxide in contact lens care solution, satisfactory results were obtained.
研究领域:
材料科学
·
电化学
·
生物传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 17
·7403-7416
·
IF 3.553
Zhou Xing-hai,Su Kun-mei,Kang Wei-min,Cheng Bo-wen,Li Zhen-huan
To buffer the unavoidable volume expansion and structure collapse problems of transitional metal sulfides during lithiation process, herein, nanosized α-MnS homogenously embedded in axial multichannel carbon nanofibers was well designed and directly used as freestanding anodes for lithium-ion batteries (LIBs). The obtained carbon nanofibers were interwoven into a flexible and cross-linked film, which offered a 3D successive conductive networks and guaranteed sufficient contact interface for electrode/electrolyte. The nanosized α-MnS was homogenously embedded into the carbon nanofiber framework and surrounded with a thin protective carbon layer, which effectively maintained the structural integrity for a satisfied cycling performance. The high aspect ratio carbon nanofibers with axial open channels supplied sufficient active sites and formed long-range electronic pathways along the axial carbon wall. Meanwhile, the radial voids provided enormous accommodation space to alleviate volume expansion and shortened diffusion paths for faster ionic transfer. Benefitting from the above unique merits, the freestanding electrodes delivered excellent lithium storage performances and remarkable long-term cycling stability, including a high initial reversible capacity of 772 mAh g −1 and excellent cycling capacity retention of 93.4% after 100 cycles at a current density of 0.5 A g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）