Molecular Catalysis
·
2025
·
IF 4.9
Kaili Wang,Mingzhe Wang,Qianzhuo Lei,Tingting Zhou,Xijun Liu,Zhen Cao,Zaiyong Jiang,Jia He
Tuning their strain effect of Pt based alloy electrocatalysts is an efficient strategy to enhance the electrocatalytic performance toward oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs). Herein, an efficient PtCu alloy aerogels (PtCu AAs) with adjustable Pt/Cu atomic ratio form a subtle lattice contraction, as well as the electrochemical dealloying process created surface defects with abundant active sites. The prepared Pt 1 Cu 2 AAs catalysts with optimal strain effects and accessible surface sites displayed much-enhanced mass activity and specific activity of 1.65 A/mg Pt and 3.96 mA/cm 2 , which are higher than those of the Pt 1 Cu 1 AAs, Pt 1 Cu 3 AAs and commercial Pt/C catalysts, respectively, originating from the optimal strain effect with the moderate degree of lattice shrinkage. Meanwhile, Pt 1 Cu 2 AAs displayed a remarkable stability. This work offers a new strategy to design an efficient ORR electrocatalyst with surface strain and defects by controlling atomic compositions and electrochemical dealloying process for PEMFCs.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Tuya Naren,Guojuan Jing,Lei Xue,Qi Wang,Yuansong Zhao,Caixia Li,Suhong Lu,Jinfang Wu,Shanghong Zeng
The development of superior catalysts for preferential oxidation of CO has always maintained challenging in heterogeneous catalysis . Herein it is found that the Pt 0.05 /CuO–CeO 2 catalyst exhibited high activity and selectivity for preferential oxidation of CO at working temperature of proton-exchange membrane fuel cells (~80 °C). The studies indicate that the presence of platinum and cerium promote the generation of oxygen vacancy and the dissociation of O 2 molecules. Meanwhile, the introduction of platinum facilitates the reduction of copper and cerium species as well as enhances the quantity of lattice oxygen. The timely update of lattice oxygen promotes CO oxidation with the help of oxygen vacancy. The finding may provide new ideas for developing the excellent ternary catalyst for preferential oxidation of CO at the proton-exchange membrane fuel cells working temperature.
研究领域:
催化
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材料科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Pengfei Yao,Jing Cao,Xue Gong,Ce Han,Mingbo Ruan,Ping Song,Weilin Xu
The development of catalysts free of platinum-group metals with a high performance for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells is a grand challenge. Herein, we report zeolitic imidazolate framework-8-based Co, N, and S tridoped carbon frameworks (Co–N–S CFs) with high ORR catalytic activity and remarkable durability in an alkaline medium. Results indicate that the high ORR performance of the Co–N–S CFs could be attributed to the unique 3D structure of carbon frames, the synergistic effect among Co, N, and S, and its high electron conductivity. It is also found that the N and S doped heteroatoms can anchor Co atoms by forming CoNx and CoSx active sites for a highly efficient ORR. The results obtained here can help in the design and understanding of the cost-effective highly active Pt-free electrocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Geng Zhang,Wangting Lu,Longsheng Cao,Xiaoping Qin,Fei Ding,Shun Tang,Zhi-Gang Shao,Baolian Yi
The reduction of Pt content together with the improvement of the durability of the catalyst for oxygen reduction reaction (ORR) is required to the large-scale commercialization of proton exchange membrane fuel cells. In this work, a novel ORR catalyst consisting of large Pd nanocrystal as the core with small Pt nanoparticles supported on the Pd core is prepared by a facile one-step synthesis method . The Pd substrate is presented in the form of well-defined cuboctahedrons and icosahedrons. The type of metal precursors and Pt/Pd molar ratio are important factors to obtain this Pd-supporting-Pt structure. The Pd 2 -s-Pt 1 catalyst with a nominal Pt/Pd atomic ratio at 1/2 shows improved ORR activity: its mass specific activity and area specific activity is 2.5 and 3.5 times that of commercial Pt/C, respectively. More importantly, the Pd 2 -s-Pt 1 catalyst demonstrates outstanding durability against potential cycling which can be ascribed to the slow dissolution of Pd core and the structure transformation from Pd@Pt to hollow PdPt alloyed nanocages . This exciting result provides a new pathway to the design of ORR catalyst with excellent durability.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Muhammad Tuoqeer Anwar,Xiaohui Yan,Muhammad Rehman Asghar,Naveed Husnain,Shuiyun Shen,Liuxuan Luo,Xiaojing Cheng,Guanghua Wei,Junliang Zhang
Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting the durability of the fuel cells. Meanwhile, carbon corrosion would also weaken the linkage between Pt and the support material, which causes Pt agglomeration, and consequently, deterioration of the cell performance. To overcome the drawbacks of a Pt/C electrocatalyst, a hybrid support material comprising molybdenum disulfide and reduced graphene oxide is proposed and synthesized in this study to exploit the graphitic nature of graphene and the availability of the exposed edges of MoS 2 . TEM results show the uniform dispersion of Pt nanoparticles over the MoS 2 -rGO surface. Electrochemical measurements indicate higher ECSA retention and better ORR activity after 10000 potential cycles for Pt/MoS 2 -rGO as compared to Pt/C, demonstrating the improved durability for this hybrid support material.
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yunjie Zhou,Feiyang Yu,Zhongling Lang,Haodong Nie,Zhenzhen Wang,Mingwang Shao,Yang Liu,Huaqiao Tan,Yangguang Li,Zhenhui Kang
Platinum (Pt) is practical available candidate for satisfying the requirements of anode catalysts in the proton exchange membrane fuel cells (PEMFCs). Totally dispersed Pt is an ideal way to minimize Pt use, and the develop of Pt-single-atom based hydrogen oxidation reaction (HOR) catalysts should be carried out in a multi-component/-function model system with a clear active site (Pt-single-atom) geometric structure. This work combines the well-defined Na 6 [H 2 PtW 6 O 24 ] clusters and multi-function carbon dots (CDs) to show the highly efficient Pt-single-atom catalyst design for HOR in acid. The mass activity and exchange current density of POMs/CDs (2.18 wt% Pt) achieved 86.72 A mg pt −1 and 3.78 A mg pt −1 , respectively, which were 9.5 and 14 times that of 20% Pt/C. Also, this catalyst exhibits better performance than 20% Pt/C in the test of single cell, including higher open circuit potential (OCP), higher power density and better long-time stability. In particular, CDs can effectively improve the catalytic performance of POMs by enhancing the electron acquisition ability of Pt in POMs, the conductivity of composites, the structure stability, the ability to resist toxicity and accelerating the transfer of H + produced on POMs.
研究领域:
材料科学
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能源化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 4
·904-912
·
IF 8.273
Long Peng,Du Shiqian,Liu Qie,Tao Li,Peng Cong,Wang Tehua,Gu Kaizhi,Xie Chao,Zhang Yiqiong,Chen Ru,Lu Shanfu,Cheng Yi,Feng Wei,Wang Shuangyin
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) bring new opportunities for portable power generation due to their outstanding advantages such as high tolerance to fuel/air impurities and simplified heat/water management. However, carbon-supported nanostructured Pt-based catalysts running at temperatures over 150°C are challenged by the severe aggregation and carbon corrosion, thus leading to poor durability. Herein, we demonstrate that dendritic Pt-Ni nanoparticles supported on fluorinated carbon black (white carbon black) could significantly enhance the performance and durability of HT-PEMFCs as the cathode catalysts running at 160°C due to the strong interaction of the F and Ni atoms to form a Ni x F y interface on Pt-Ni nanoparticles. With the formation of a stable Ni x F y interface, this integrated HT-PEMFC reached peak power densities of 906 mW cm −2 and demonstrated excellent durability at 160°C under anhydrous H 2 /O 2 conditions. This mitigation strategy was applied to Pt-alloy/C electrocatalysts and resulted in the elimination of Pt dissolution in practical fuel cells.
研究领域:
材料科学
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能源技术
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Chang Dong,Xin Xu,Jin Zhang,Haining Wang,Yan Xiang,Haijin Zhu,Maria Forsyth,Shanfu Lu
Introduction of porous structure to high temperature polymer electrolyte membranes is one of effective pathways to increase their proton conductivity under elevated temperature. However, the effect of the porous structure on the proton diffusion mechanism of these membranes is still unclear. In this work, the proton transport behaviour of a series of porous triazole-polysulfone (PSf) membranes under elevated temperature is comprehensively investigated. The functional triazole ring in the framework of porous triazole-PSf acts a proton acceptor to form acid-base pair with phosphoric acid (PA). In addition, the proton diffusion coefficient and proton conductivity of PA-doped porous triazole-PSf is an order of magnitude higher than that of the PA-doped dense triazole-PSf membrane. Percolation theory calculation convinces that the high proton conductivity of PA-doped porous triazole-PSf is due to the formation of continuous long-range proton diffusion channels under high pore connectivity and porosity. On the contrary, excessive pore connectivity also results in high gas permeability , leading to decrease of the open circuit voltage and cell performance of the single cell. Consequently, the optimum porosity for the PA-doped porous triazole-PSf membrane is 75% for fuel cell operating with the maximum peak power density of 550 mW·cm −2 and great durability for 120 h under 140 °C.
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 MATERIALS SCIENCE
·
2020
·Vol. 55
·期 11
·4558-4569
·
IF 3.553
Li Tianya,Wang Kejian,Wang Jihao,Liu Yueqi,Han Yufen,Song Jinghui,Hu Hengwei,Lin Guangyi,Liu Yong
Proton exchange membrane fuel cell (PEMFC) is a promising automotive power source that has been gradually applied due to its many advantages such as pollution-free and low-temperature start-up. The gas diffusion layer (GDL) is a key component for water and gas management in PEMFC. It can directly affect the performance of PEMFC. In this paper, we prepared a new type of GDL with hierarchical pores to improve the performance of PEMFC at high current density. The new GDL mainly includes a commercial carbon paper layer and two microporous layers on the same side of carbon paper. The microporous layer near carbon paper was modified with pore former, and another layer was produced without pore former. The pore size of the middle microporous layer was controlled by the content of pore former and times of sonication. From the results of the polarization curve, electrochemical impedance spectroscopy, water contact angle, conductivity, and pore size distribution, it was found that GDL with hierarchical pores shows obvious advancement than commercial GDL. The PEMFC performance was tested to compare the new and commercial GDL. The results show that the peak power of our GDL at 100% humidity reaches 1.24 W/cm 2 and the limit current density is 3.500 A/cm 2 . The modification of the pore size of the microporous layer near the carbon paper side can improve the water management ability of the fuel cell.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 7
·1775-1780
·
IF 4.154
Xinyue Zhang,Qingtao Liu,Jianglan Shui
Graphical Balancing act : Polytetrafluoroethylene (PTFE) is added to different positions of the Fe−N−C catalyst layer by using three methods to adjust its hydrophobicity. An appropriate amount of PTFE in the Fe−N−C catalyst layer is beneficial to the power density of the PEM fuel cell. However, the hydrophobicity of the Fe−N−C catalyst layer does not affect the long-term durability of the fuel cells, although high hydrophobicity will improve the fuel cell initial durability. The hydrophobicity of the cathode catalyst layer (CCL) affects the performance of the proton exchange membrane fuel cell (PEMFC) by adjusting the water management of the catalyst layer, which has been extensively studied in Pt-based catalysts. Here, the effect of the hydrophobicity of Fe−N−C CCL on the performance of the PEMFC is investigated. The hydrophobicity of the Fe−N−C CCL is tuned by polytetrafluoroethylene (PTFE) by using three addition methods: 1) coat PTFE on Fe−N−C powder and heat-treat; 2) mix PTFE emulsion with Fe−N−C ink and then brush the electrode; and 3) transfer a ground PTFE/Fe−N−C composite film onto the gas diffusion layer by the decal method. For each PTFE addition method, the optimized PTFE amount can increase the power density of Fe−C−N PEMFC by 15.1 %, 26.6 %, and 87.2 %, respectively. At the same time, it is found that enhanced hydrophobicity reduces the initial current decay rate of the Fe−N−C CCLs, but their residual current densities are close after a 50 h durability test at 0.5 V in a H 2 -O 2 PEMFC. It can be concluded that the hydrophobicity of the Fe−N−C CLL has a great influence on the power density of the fuel cell, but the influence on the long-term durability of the fuel cell is negligible.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Jian Wang,Guoliang Liu,Ailian Wang,Wenxi Ji,Longgui Zhang,Taoyi Zhang,Jing Li,Hongfei Pan,Haolin Tang,Haining Zhang
Development of simple synthetic strategy for polybenzimidazole-based membranes with high uptake and retention ability of phosphoric acid is essential for long-term practical applications of high temperature proton exchange membrane fuel cells. In this work, N, N -dimethylacetamide is used as both deacid reagent and solvent for N-alkylation reaction to synthesize imidazolium cations-grafted polybenzimidazole. The accordingly formed membranes exhibit the improved uptake and retention ability of phosphoric acid compared to pristine polybenzimidazole membrane. The optimized membrane with grafting degree of 60% has an acid uptake of 361.2 wt% with an anhydrous proton conductivity of 75.2 mS cm −1 at 160 °C, about 4.2 times higher than that of pristine polybenzimidazole membrane. After the acid retention test at 160 °C for 240 h, proton conductivity of the optimized membrane decreases by 7.5%, lower than that of pristine polybenzimidazole membrane under the same conditions (11.9% loss). The thus-assembled single cell delivers the power density of 0.429, 0.596, and 0.708 W cm −2 under 0, 100 and 200 kPa back pressures whereas the values are 0.319, 0.427 and 0.510 W cm −2 for the cell assembled from phosphoric acid-doped pristine polybenzimidazole membrane.
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
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Bin Hu,Jinglin Yuan,Jun Zhang,Qinghua Shu,Daqin Guan,Guangming Yang,Wei Zhou,Zongping Shao
The large-scale synthesis of catalysts with promising performance and durability for oxygen reduction reaction (ORR) is essential to the industrialization of proton exchange membrane fuel cells (PEMFCs). Pt-based alloys prepared using the co-doping strategy have shown great promise. Herein, we report a co-doping tactic for producing high-performance Pt–Cu–Co ternary alloy catalysts on a mass scale. Cu and Co are doped into the material in one step and the co-doping of Cu and Co can optimize the electronic structure of Pt, thereby weakening the adsorption of oxygenated species with Pt to enhance ORR activity. The PtCu 0·72 Co 0.01 and PtCu 0·72 Co 0.01 –10 g (scaled-up production) exhibit superior mass activity of 0.52 A mg Pt −1 and 0.43 A mg Pt −1 , respectively, and peak power density in H 2 -Air conditions of 1.15 W cm −2 and 1.01 W cm −2 . Furthermore, the mass activity of catalysts was only attenuated by 8.3% and 9.5% after 30,000 cycles, indicating reasonably good durability.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 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）