Nature Catalysis
·
2025
·
IF 44.6
Zhou Hang,Li Huan,Wang Liang,Chu Shengqi,Liu Lujie,Liu Lu,Qi Jizhen,Ren Zhouhong,Cai Anyu,Hui Yu,Qin Yucai,Song Lijuan,Qin Xuedi,Shi Jiaqi,Hou Jue,Ding Yongqi,Ma Jiabi,Xu Shaodan,Tao Xin,Li Lina,Yang Qi,Hu Bingwen,Liu Xi,Chen Liwei,Xiao Jianping,Xiao Feng-Shou
Propane dehydrogenation has been used industrially as a non-oil-based propylene production process, but it strongly depends on precious-metal catalysts such as supported Pt materials, which dominate most propane dehydrogenation processes currently used in industry. Catalysts with earth-abundant metals have been explored with a view to replacing Pt, but their performances remain inadequate. Here we report a cobaltosilicate zeolite catalyst, which has solely tetrahedral cobalt sites and none of the unstable cobalt species in the zeolite crystals that are characteristic of conventional cobaltosilicate materials. This catalyst exhibits properties that could be attractive for industrial application, including sufficient propylene productivity, high stability and facile regenerability. Moreover, this system outperforms the benchmark supported Pt–Sn catalysts under equivalent conditions.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4825-4833
·
IF 2.8
Yu Dan,Dong Seng,Liu Qian,Jia Weiyi,Gao Faming,Wang Yatao
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass activity of the series of Pd-based catalysts followed the descending order: PdNi NWs/C > commercial Pt/C > PdCo NWs/C > PdFe NWs/C > pure Pd NWs/C. The optimal half-wave (E 1/2 ) of PdNi NWs/C (839 mV) is positive shift 138 and 25 mV compared with pure Pd NWs/C (701 mV) and commercial Pt/C (814 mV), respectively. The mass activity (MA) of PdNi NWs/C only dropped 28% after 10,000 potential cycles between 0.6 and 1.1 V versus RHE in acid medium. This work provides a promising and reliable strategy to synthesize high performance Pd-based electrocatalyst, which is promising alternative to expensive Pt-based electrocatalysts for fuel cells. Graphical Abstract TOC: We prepared bimetallic PdNi nanowires, which ORR mass activity higher than pure Pd nanowires and commercial Pt/C in acidic medium.
研究领域:
材料科学
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电化学
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能源催化
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
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IF 1.5
Xiaofeng Xie,Lanshan Liu,Shusheng Chen,Yuanquan Zhou,Xiaohong Hu
Proton electrolyte membrane water electrolysis (PEMWE) is a promising hydrogen generation method limited by the high cost, such as those costs associated with noble electrocatalysts. Herein, we investigate commercial tungsten carbide (WC), a potential substitute for Pt, as a hydrogen evolution reaction (HER) electrocatalyst in PEMWE. We adopted two sizes of WC, 400 nm and 1 μm, optimized the electrode fabrication method and running conditions. The results show that the smaller WC does not provide stable performance and operating at high current density and low temperature is more competitive with Pt-based electrolysis. In addition, the most serious drawback is the increased cell voltage on restart after long-term power-off due to considerable WC oxidation, which leads to a decrease in the catalytic carbide carbon. Luckily, this can be offset by effective O 2 isolation in the cathode, such as H 2 O sealing or pumping with H 2 . WC is an economic alternative as a HER electrocatalyst in PEMWE with optimized conditions and an O 2 isolation strategy during an interrupted operation. We provide a practical method to reduce the cost of the HER electrocatalyst.
研究领域:
材料科学
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电化学
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可再生能源
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
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IF 6.97
Kexin Huang,Wanqing Zhang,Jia Li,Youjun Fan,Bo Yang,Chuyan Rong,Jiuhui Qi,Wei Chen,Jun Yang
Carbon nanomaterials doped with nitrogen/transition metals (metal–N–C) are promising to substitute platinum (Pt) for catalyzing the oxygen reduction reaction (ORR). Metal–N–C can be effectively derived from pyrolysis of metal–organic frameworks but usually suffers from microscale aggregation. Herein, we report an in situ approach to anchor zeolite imidazole framework (ZIF-67)-derived Co, N-doped porous carbon on multiwalled carbon nanotubes (MWCNTs), labeled CNTs@Co–N–PC, and investigate its performance as electrocatalysts for the ORR in alkaline medium. This strategy combines pyrolysis with acid etching of ZIF-67 to convert its Co–N4 frames into stable and dense Co, N-doped porous carbon on the surface of MWCNTs. In the core–shell-like CNTs@Co–N–PC hybrid catalysts, the MWCNTs serving as supports effectively inhibit the aggregation of Co–N–PC and therefore guarantee sufficient active sites available for the occurrence of the ORR. Consequently, these CNTs@Co–N–PC electrocatalysts exhibit comparable activity to commercial Pt/C and are featured with favorable long-term durability and superior methanol tolerance.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2022
·Vol. 28
·期 5
·414-422
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IF 0
Shao Wu,Wu Wenjun
Ensuring high power conversion efficiency, partially or completely replacing Pt electrodes with inexpensive materials is one of the important development directions of dye-sensitized solar cells (DSSCs). In this work, we have developed a three-component (MWCNTs, carbon black and graphite) carbon (tri-carbon) electrode material for DSSC devices combined with the advantages of high electron transfer kinetics of MWCNTs, plentiful catalytic sites in crystal edges of carbon black and superior electrical conductivity and catalytic activity of graphite. Using a tri-carbon electrode, a Pt electrode, and two N719-sensitized photoanodes, a parallel tandem dye-sensitized solar cells are assembled obtaining a high PCE of 10.26% ( V oc = 0.70 V, J sc = 19.99 mA/cm 2 , FF = 73.33%). It opens up a new avenue for the development of low-cost and high-performance DSSCs.
研究领域:
材料科学
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可再生能源
✓ 已验证
产品关联
DOI
SOLAR ENERGY
·
2017
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IF 4.018
Kang Zhang,Jixin Yao,Qun Yang,Xueqin Zuo,Huaibao Tang,Feng Du,Guang Li,Wenqi Wang
A novel cotton shells-like composite of uniform MoS 2 with the carbon coated is prepared by a simple and efficient route. This particular MoS 2 @C hybrid is beneficial for a dye-sensitized solar cell (DSSC) as an inexpensive but high efficient platinum-free counter electrode. Meanwhile, the synergistic effects of catalytically active MoS 2 flower-morphology and conductive carbon supports are conducive to improve charge transfer resistance, electrocatalytic activity and fast reaction kinetics of the reduction of triiodide. The DSSC assembled with this original MoS 2 @C counter electrode (CE) indicates superior photoelectric conversion efficiency (6.93%), which exceeds that of the DSSC with a Pt counter electrode (6.68%).
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
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IF 4.674
Shuang Lu,Yinglin Wang,Chunxia Wu,Yichun Liu,Xintong Zhang
Searching for large-scale, non-Pt, efficient counter electrode (CE) materials is still a key challenge to realize the applications of high-performance dye-sensitized solar cells (DSSCs). Herein, we report the spray fabrication of stable, uniform and efficient CoS counter electrode at temperature no higher than 100 °C from CoS nanoparticles prepared by the ultrasonic spray pyrolysis (USP) method. The as-fabricated USP-assisted CoS CEs exhibit comparable electrocatalytic activity to the traditional thermolyzed Pt CE, generating a power conversion efficiency of 8.6% for unoptimized DSSCs. This CoS CEs also exhibited prominent electrochemical and mechanical stability, uniform electrocatalytic activity at the size of 10 × 10 cm, and good bending durability when deposited on flexible ITO/PEN conductive substrates, manifesting the merits of this USP-based strategy for the development of high-performance non-Pt electrocatalysts.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Wei Zhao,Jincheng Liu,Zhongxiang Ding,Jinhong Zhang,Xiaoyu Wang
CdS nanophotocatalysts generally require precious metal Pt as a cocatalyst to enhance photocatalytic hydrogen production performance, but precious metal Pt reserves are scarce and expensive. Therefore, this study hopes to prepare CdS/MoS 2 (CM) composites by uniformly distributing MoS 2 nanosheets on the surface of CdS nanowires by a two-step method. After a series of tests, CM composite can expand the absorption range of visible light and improve the separation and transmittance of photogenerated electrons and holes. The results show the highest hydrogen production rate of 1.79 mmol•g −1 •h −1 was obtained with the CdS/MoS 2 ratio of 0.3, which is 35.8 times that of bare CdS nanowires. The excessive MoS 2 nanosheets will block light adsorption of CdS and inhibit the hydrogen production performance of the CM composite. This study provides a new research direction for finding cheap cocatalysts to replace precious metal Pt.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
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IF 7.723
Xiaoyong Xu,Lou Pan,Qiutong Han,Chengzhong Wang,Peng Ding,Jing Pan,Jingguo Hu,Haibo Zeng,Yong Zhou
Molybdenum sulfide (MoS 2 ) has attracted considerable attention as one of noble-metal-free co-catalysts of hydrogen evolution reaction (HER) for artificial photosynthetic water splitting. There are well-known challenges in optimizing its catalytic activity to pursue the replacement of platinum (Pt) for HER, owing to the edge-limited active sites and intrinsically poor conductivity. Herein, we prepared metallic MoS 2 nanodots (MNDs) with 1T-phase occupation and edge-exposure maximum to achieve the simultaneous optimization of electric conductivity and active sites. When integrated as co-catalysts with graphitic carbon nitride (g-CN) for sunlight-driven HER in alkaline electrolyte, the outstanding photocatalytic activity with hydrogen evolution rate of 5.62 mmol g −1 h −1 , over 280 times higher than that of pure g-CN, demonstrates the excellent co-catalytic performance of 1T-MoS 2 NDs (1T-MNDs) that even comparable to state-of-the-art Pt. The photo-induced charge dynamics describe the role of 1T-MNDs in facilitating charge separation as well as surface catalytic reaction, suggesting a promising potential of 1T-MNDs with more active sites and higher conductivity as Pt-alternative co-catalysts for solar hydrogen production.
研究领域:
材料科学
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能源化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Cun Hu,Fengyun Ding,Chao Lv,Linsen Zhou,Ning Zeng,Aojie Liu,Jinguang Cai,Tao Tang
Proton exchange membrane (PEM) water electrolysis is crucial for efficient hydrogen isotope separation (HIS) in liquid water. However, current cathode catalysts like platinum (Pt) suffer from scarcity and limited HIS performance. To overcome this challenge, we propose a simple and effective approach involving the synthesis of highly dispersed NiP 2 nanoparticles supported on carbon (NiP 2 /C) through a solid-phase phosphidation reaction, and for the first time report its enhanced HIS performance as the cathode catalyst in PEM electrolyzer. The NiP 2 /C catalyst demonstrates excellent catalytic properties as a cathode catalyst for hydrogen evolution reaction (HER) in an acidic electrolyte, achieving low overpotential of only 157 mV at 10 mA/cm 2 and Tafel slope of 95.6 mV/dec. Meticulous investigations and density functional theory (DFT) calculations reveal the intrinsic factors behind its performance. Furthermore, DFT calculations predict the HIS performance of both NiP 2 /C and Ni/C catalysts, revealing the advantages of NiP 2 /C over Ni/C. Experimental results obtained in practical PEM water electrolysis validate these predictions, as NiP 2 /C exhibits an impressive separation factor α of 6.36, nearly twice that of the Pt/C catalyst. Moreover, NiP 2 /C demonstrates reliable and consistent HIS performance during a 100-hour PEM electrolysis process. Importantly, our calculation model for deuterium enrichment in liquid water reveals that catalysts with higher separation factors α show faster deuterium enrichment and higher deuterium recovery rates. The utilization of NiP 2 /C as a non-noble metal cathode catalyst holds great promise for efficient and sustainable hydrogen isotope separation, addressing the limitations of precious metal catalysts and advancing clean energy technologies.
研究领域:
能源科学
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
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IF 6.337
Hong Yuan,Qingze Jiao,Jia Liu,Xiufeng Liu,Yongjian Li,Daxin Shi,Qin Wu,Yun Zhao,Hansheng Li
A novel nanocomposite of Co 0.85 Se nanotubes with reduced graphene oxide (Co 0.85 Se/RGO) is prepared by a facile hydrothermal approach coupled with in situ selenization, which is applied as counter electrode in dye-sensitized solar cells. Electrochemical analysis shows that the Co 0.85 Se/RGO composite displays a higher electrocatalytic activity for the reduction of triiodide respect to its single components due to the unique hollow structure of Co 0.85 Se as well as the synergistic effects of high catalytically active Co 0.85 Se and conductive RGO. As a consequence, the dye-sensitized solar cell (DSSC) fabricated with the Co 0.85 Se/RGO electrode presents a high photovoltaic conversion efficiency of 7.81%, exceeding the cell based on a Pt electrode (7.55%). Moreover, a considerable electrochemical stability is also achieved when the material was used as a counter electrode in a I − /I 3 − electrolyte. Therefore, the Co 0.85 Se/RGO exhibits a huge potential as efficient and low-cost Pt-free counter electrode material to replace Pt allowing for large-scale fabrication of DSSCs.
研究领域:
材料科学
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能源技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 19
·16329-16334
·
IF 3.201
Jian Cheng,Junhong Ma,Yuhua Ma,Cui Zhou,Yue Qiang,Xiaofeng Zhou,Jianya Yang,Haokun Shi,Yahong Xie
Dye-sensitized solar cells (DSSCs) have many advantages, but the use of expensive platinum counter electrodes (CEs) limits their industrial applications. In this work, a Co–Ni/carbon aerogel composite with a unique three-dimensional network structure and high specific surface area was prepared through simple ion exchange and carbonization of low-cost sodium alginate supramolecular hydrogels. Using this metal/carbon aerogel composite as the CE (hereafter denoted as CAE) of ZnO-based DSSCs, a photoelectric conversion efficiency (PCE) of 5.08% was obtained. This value was 94.44% of the PCE obtained using Pt. Analysis of current–voltage curves, cyclic voltammograms, and electrochemical impedance spectra revealed that the fabricated CAE had higher catalytic activity than a Pt CE and comparable charge-transfer ability. The adhesion of the CAE onto FTO was also strong with carbon paste as an adhesive.
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）