INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yue Zhang,Haoyang Huang,Lijie Cui,Yongsheng Han
Electrochemical hydrodesulfurization technology is a promising approach to remove sulfur compounds from fossil fuels, having the advantages of moderate operating condition, low energy consumption, and high automation. This method is still in the research and development stage, and the desulfurization efficiency needs to be improved. Here, we report an attempt to improve the desulfurization efficiency by increasing the active sites of catalysts. The amorphous MoSx are chosen as the catalysts and synthesized by the electrodeposition method at diffusion-limited conditions, which is regulated by either increasing the deposition potential or by adding glycerol into the electrolyte. With the decrease of chemical diffusion, the morphology of MoSx catalysts changes from continuous lamellae to dispersed nanoparticles on the surface of carbon cloth. Owing to the extensive exposure of the bridging sulfur groups S22– and undercoordinated Mo(V) regions, the MoSx particles exhibit a more than two times increase of the desulfurization efficiency, reaching 22.5% in the electrochemical hydrodesulfurization. This study shows that structure optimization of catalysts by diffusion control is a facile and general strategy to improve reaction efficiency, which may be applied to various catalysts.
研究领域:
材料科学
·
催化化学
·
能源技术
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 12
·1455
·
IF 3.52
Qi Li,Wanli Liu,Xuejian Xie,Xianglong Yang,Xiufang Chen,Xiangang Xu
Co-catalyst deposition is used to improve the surface and electrical properties of photocatalysts. In this work, MoSx/CdIn2S4nanocomposites were prepared by a facile hydrothermal and photodeposition route. The basic crystalline phases and morphology of the as-prepared samples were determined, and these results showed that MoSxwas tightly anchored onto CdIn2S4by sharing the same S atom. In the hydrogen production experiments, MoSx/CdIn2S4-40 displayed the optimal photocatalytic hydrogen production yield in 4 h. The H2evolution rate reached 2846.73 μmol/g/h, which was 13.6-times higher than that of pure CdIn2S4. Analyzing the photocatalytic enhancement mechanisms revealed that this unique structure had a remarkable photogenerated electron-hole pair separation efficiency, rapid charge carrier transfer channels, and more abundant surface reaction sites. The use of co-catalyst (MoSx) greatly improved the photocatalytic activity of CdIn2S4.Keywords:co-catalyst;photocatalyst;hydrogen production;CdIn2S4;MoSx
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ming Li,Xiandong Wang,Haoran Ruan,Qingyan Zhang,Zhenjun Wu,Yongping Liu,Zhenhuan Lu,Jiefeng Hai
Constructing heterojunction is one of the methods for improving the photocatalytic activity by restraining the electron-hole recombination. In this work, a simple cation-exchange approach was employed to grow amorphous MoS x (a-MoS x ) on PbS surface to fabricate PbS/a-MoS x heterojunction for the first time. The formation of a-MoS x has been confirmed by XRD, Raman, TEM, EDS and XPS analysis . PbS/a-MoS x composites showed improved light harvesting ability compared with pristine PbS. The optimized composite exhibited greatly enhanced photocatalytic activity using methylene blue as the target of elimination, and displayed a photocurrent about 9 times higher than pristine PbS due to the efficient separation of photogenerated electron-hole pairs.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Taotao Zhao,Yuchi Liu,Chenyang Shen,Gui Liu,Jun Yao,Xiaofeng Qian,Qiang He,Feifei Mei,Deming Meng,Xuefeng Guo,Luming Peng,Nianhua Xue,Yan Zhu,Yuming Zhou,Weiping Ding
Here, we report a high-performance catalyst MoS x @HSSZ-39 for conversion of CO x to C 2–4 hydrocarbons, in which MoS x clusters for CO x hydrogenation at the first to intermediate methanol and then the zeolitic acid sites surrounding for further conversion of methanol to hydrocarbons. For CO 2 hydrogenation, C 2–4 hydrocarbons of ∼90% selectivity in organic products at 32.7% of CO 2 conversion and excellent stability of 1000 h on stream are obtained. For CO hydrogenation, 95% of C 2–4 hydrocarbons, 83% of LPG or 74% of propane selectivities at > 22% CO conversion and stable more than 200 h on stream are obtained. The cooperation among the MoS x clusters and the zeolitic acid sites constitutes the catalyst of intimate bifunction, which is the key to the high catalytic performance for CO x hydrogenation.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 45
·39137-39143
·
IF 3.289
Jiajun Wei,Zhigang Yin,Shan-Ci Chen,Dongdong Cai,Qingdong Zheng
Here we employed a simple solution-processed method to prepare MoSx films as hole-transport layers (HTLs) in polymer solar cells (PSCs). Impressive performance was achieved with a power conversion efficiency (PCE) of 7.50%, which is comparable to those of the conventional devices with PEDOT:PSS HTLs. The surface and optoelectronic characteristics of MoSx films obtained from different conditions were investigated. The results reveal that the annealing temperature of MoSx is one of the most important factors on determining the device performance. PSCs based on MoSx films exhibited much better device stability compared to the counterpart based on PEDOT:PSS, suggesting that the MoSx film is a promising alternative HTL for PSCs.
研究领域:
材料科学
·
能源科学
·
光电技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Wang,Heng Guan,Yizhuo Fan,Jian Fang,Duo Sun,Yu Chen,Shengping Ruan
Manganese tungstate (MnWO 4 ) is a novel catalytic semiconductor metal oxide with untapped potential for acetone-sensing applications. The construction of amorphous-crystalline heterojunctions shows promising prospects for developing new high-performance gas-sensitive materials. Here, an amorphous-MoS x /crystalline-MnWO 4 composite material was constructed, and the acetone-sensing properties were explored. Due to the abundant surface hanging bonds and defects of amorphous molybdenum sulfide as gas adsorption and reaction sites, the MoS x /MnWO 4 material has a richer surface adsorption oxygen and acetone sensing properties. Combined with carrier regulation effect of the p-n heterojunction, the optimum operating temperature of the MoS x /MnWO 4 composite is reduced (120 °C) and the response towards acetone is improved, reaching a value of 10.54 (100 ppm), which is approximately 4.5 times higher than that of the pure MnWO 4 material. This work is of reference significance for the application of amorphous MoS x in the field of gas sensing and the construction of high-performance acetone sensors.
研究领域:
材料科学
·
传感技术
·
纳米技术
·
半导体物理
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Rui-Yuan Li,Yu-Xin Guo,Xiao-Yu Yang,Zhan Liu,Xiaoyun Li,Yu Li,Yiyong Huang,Jinping Liu,Shen Yu,Ming-Hui Sun,Li-Hua Chen,Bao-Lian Su,Yilong Wang
Designing the MoSx-based materials to simultaneously realize high intrinsic activity and reliable stability remains quite challenging since there is a contradictory relationship between them. For example, high intrinsic activity or efficient charge transfer indicates that the MoSx-based materials can provide abundant electron-rich sulfur atoms for hydrogen evolution reaction (HER); lots of H* will attack these sulfur atoms; thus, this results in the massive missing of sulfur atoms and poor electrochemical stability. Instead, electron-deficient sulfur atoms lead to an unsatisfactory HER activity regardless of high stability. Herein, a feasible strategy for spin-state regulation is proposed to promote charge transfer, strengthen the Mo-S bond and activate sulfur atoms of MoSx toward efficient HER. In our strategy, the spin transition of the Co-doped species increases the unpaired electrons, favors wide spin channels and accelerates localized electrons transfer; additionally, Co-doping decreases the band-gap of electrocatalyst. These factors collectively improve charge transfer during HER. Second, the spin- and electronegativity-induced electron redistribution decreases the Mo-S bond length, which efficiently inhibits the massive missing of bridging or apical sulfur atoms. Third, introducing Co species into [Mo3S13]2- nanoclusters activates the terminal sulfur atoms owing to reasonable charge accumulation to favor the absorption of H*. With these benefits, the optimized electrocatalyst demonstrates high intrinsic activity and reliable stability. Our work provides a feasible strategy to design and synthesize the outstanding MoSx-based materials from the spin effect, and presents an insightful understanding of the possible mechanism on hydrogen spillover as well as enhancing their durability and structural stability toward efficient electrocatalysis.
研究领域:
材料科学
·
电催化
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2023
·
IF 9.6
Chao Wang,Jingyi Zhang,Li Wang,Jianmin Feng,Liqun Wang,Lei Dong,Conglai Long,Dejun Li,Feng Hou,Ji Liang
The crucial step for splitting water is the oxygen evolution reaction . The key to promote this reaction lies in the catalyst. Molybdenum disulfide , as a two-dimensional material with molybdenum and sulfur atoms stacked, is especially suitable as a doping platform to develop high-performance OER catalysts. Fe/Co/Ni ternary transition metal combination has always been a highly active catalytic site for OER. Heteroelement of Fe/Co/Ni doping is expected to effectively modify the local electronic configuration of matrix materials and thus enhances their electrocatalytic OER capability. With this in mind, we report a simple in-situ hydrothermal doping of MoS x nanowires on iron‑nickel alloy foam with ternary transition metal of Fe/Co/Ni. This ternary transition metal of Fe/Co/Ni doped f self-supported electrode (denoted Fe/Co/Ni-MoS x /INF) displays outstanding OER performance in terms of small overpotentials of 214 and 263 mV at current densities of 10 and 100 mA/cm 2 , respectively, in alkaline solution. It was far better than the commercial Ir/C catalysts (253 and 434 mV@10 and 100 mA/cm 2 ). The Tafel slope is about 48.1 mV/dec. Moreover, Fe/Co/Ni-MoS x /INF also has an excellent catalytic stability without any obvious performance decay after 20 h operation. This work contributes to the investigation of high-efficiency OER catalysts based on transition metal-doped MoS x and offers a substitute for noble metal catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xing Qian,Chong Xu,Yiqing Jiang,Jie Zhang,Guoxiang Guan,Yixuan Huang
Multi-shelled micro-/nanomaterials with complex hollow structures have been regarded as a promising kind of advanced catalysts for energy conversion owing to their large specific surface, increased active sites, and shortened paths of charge transfer. Herein, a series of double-shelled transition metal chalcogenides (Ni-Co-MoS x , Co-MoS x , and Ni-MoS x ) with ball-in-ball hollow structures have been synthesized by converting corresponding metal-glycerol spherical precursor with the assistance of (NH 4 ) 2 MoS 4 under a facile solvothermal condition. In this process, (NH 4 ) 2 MoS 4 acted as a multifunctional vulcanizator, which could conveniently afford Mo and S elements at the same time, and the mass ratio of the precursor to (NH 4 ) 2 MoS 4 played an indispensable role in preparing the uniform hollow sphere with satisfactory morphology and catalytic performance. Noteworthily, compared with ternary Co-MoS x and Ni-MoS x , the quaternary Ni-Co-MoS x ball-in-ball nanospheres demonstrated much enhanced catalytic properties in accelerating the reduction of triiodide in dye-sensitized solar cells (DSSCs) and the electrochemical hydrogen evolution reactions (HERs) due to the advantages of multi-elements, moderated surface texture, and larger surface area. Specifically, a prominent power conversion efficiency of 9.63% was achieved by the DSSC assembled with Ni-Co-MoS x counter electrode (CE), which was much superior to that of Pt CE (8.28%). Besides, Ni-Co-MoS x showed a low η 10 of 93.4 mV and a small Tafel slope of 55.0 mV dec −1 when employed as electrocatalysts for HER in 0.5 M H 2 SO 4 .
研究领域:
材料科学
·
能量转换
·
催化
·
纳米技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Han Zhang,Guoqiang Shen,Xinying Liu,Bo Ning,Chengxiang Shi,Lun Pan,Xiangwen Zhang,Zhen-Feng Huang,Ji-Jun Zou
Developing effective and practical electrocatalyst under industrial electrolysis conditions is critical for renewable hydrogen production . Herein, we report the self-supporting NiFe LDH-MoS x integrated electrode for water oxidation under normal alkaline test condition (1 M KOH at 25 °C) and simulated industrial electrolysis conditions (5 M KOH at 65 °C). Such optimized electrode exhibits excellent oxygen evolution reaction (OER) performance with overpotential of 195 and 290 mV at current density of 100 and 400 mA·cm −2 under normal alkaline test condition. Notably, only overpotential of 156 and 201 mV were required to achieve the current density of 100 and 400 mA·cm −2 under simulated industrial electrolysis conditions. No significant degradations were observed after long-term durability tests for both conditions. When using in two-electrode system, the operational voltages of 1.44 and 1.72 V were required to achieve a current density of 10 and 100 mA·cm −2 for the overall water splitting test (NiFe LDH-MoS x /INF || 20% Pt/C). Additionally, the operational voltage of employing NiFe LDH-MoS x /INF as both cathode and anode merely require 1.52 V at 50 mA·cm −2 at simulated industrial electrolysis conditions. Notably, a membrane electrode assembly (MEA) for anion exchange membrane water electrolysis (AEMWEs) using NiFe LDH-MoS x /INF as an anode catalyst exhibited an energy conversion efficiency of 71.8% at current density of 400 mA·cm −2 in 1 M KOH at 60 °C. Further experimental results reveal that sulfurized substrate not only improved the conductivity of NiFe LDH, but also regulated its electronic configurations and atomic composition, leading to the excellent activity. The easy-obtained and cost-effective integrated electrodes are expected to meet the large-scale application of industrial water electrolysis.
研究领域:
材料科学
·
电化学
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Xing Qian,Hongyu Liu,Yixuan Huang,Zejia Ren,Yating Yu,Chong Xu,Linxi Hou
Transition metal chalcogenides with yolk-shell nanostructures are a family of promising electrocatalytic materials with complex interior construction and remarkable structural tenability. In this work, a sequence of yolk-shell transition metal sulfide nanospheres (Co-Ni-MoS x , Co-MoS x and Ni-MoS x ) are prepared as superior Pt-free catalysts for dye-sensitized solar cells. This yolk-shell structure, consisting of a thin shell and an inner porous core, exposes more active sites and provides more contact regions between the electrolyte and catalyst. By comparing with the ternary Co-MoS x and Ni-MoS x nanospheres , the quaternary Co-Ni-MoS x nanospheres have advantages of the relatively larger surface area , favourable chemical composition , higher conductivity and excellent catalytic performance for expediting the reduction of I 3 − in solar cells. Particularly, as for Co-Ni-MoS x , a splendid power conversion efficiency of 9.76% is achieved under a standard irradiation, which is much better than that of Pt (8.24%).
研究领域:
材料科学
·
纳米技术
·
太阳能
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 88
·期 1
·227-235
·
IF 1.745
Gao Qiuyue,Jin Yani,Jin Yiming,Wang Xiaoqing,Ye Ziran,Hong Zhanglian,Zhi Mingjia
Abstract This work reported the preparation of amorphous MoS x aerogel and MoS x /carbon nanotubes composite aerogels by a modified epoxide addition sol–gel method. In this process, propylene epoxide scavenged the protons from a S–H-contained organic acid ( dl -Mercaptosuccinic acid) and promoted the interactions between (NH 4 ) 6 Mo 7 O 24 •4H 2 O and the functional groups in the organic acid to form a gel. The sulfur and molybdenum contained a wet gel turned into an amorphous MoS x aerogel after supercritical drying in ethanol. Carbon nanotubes can be further incorporated into the aerogel backbone, which can extend the specific surface area and alter the pore structures in the composite aerogels. Such composite aerogels showed good catalytic performance in electrochemical hydrogen evolution reactions.
MoS x aerogels can be prepared by the modified epoxide-adding method and showed good catalytic activity toward HER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）