iScience
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2022
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IF 6.107
Tao Chen,Fanghua Ning,Jizhen Qi,Guang Feng,Yucheng Wang,Jin Song,Tonghuan Yang,Xi Liu,Liwei Chen,Dingguo Xia
Summary Searching for an efficient, durable, and low cost catalyst toward oxygen reduction reaction (ORR) is of paramount importance for the application of fuel cell technology. Herein, PtFeCoNiCu high-entropy alloy nanoparticles (PFCNC-HEA) is reported as electrocatalyst toward ORR. It shows remarkable ORR catalytic mass activity of 1.738 A mg −1 Pt at 0.90 V, which is 15.8 times higher than that of the state-of-art commercial Pt/C catalyst. It also exhibits outstanding stability with negligible voltage decay (3 mV) after 10k cycles accelerated durability test. High ORR activity is ascribed to the ligand effect caused by polymetallic elements, the optimization of the surface electronic structure, and the formation of multiple active sites on the surface. In the proton exchange membrane fuel cell setup, this cell delivers a power density of up to 1.380 W cm −2 with a cathodic Pt loading of 0.03 mg Pt cm −2 , demonstrating a promising catalyst design direction for highly efficient ORR.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5296
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IF 4.6
Zhenjiang Lu,Wenjin Qin,Juan Ma,Yali Cao,Shujuan Bao
Direct formic acid fuel cells (DFAFCs) are one of the most promising power sources due to its high conversion efficiency; relatively low carbon emissions, toxicity, and flammability; convenience; and low-cost storage and transportation. However, the key challenge to large-scale commercial applications is its poor power performance and the catalyst’s high preparation cost. In this study, a new sandwich-structured Pd/polypyrrole-graphene/Pd (Pd/PPy-Gns/Pd)-modified glassy carbon electrode (GCE) was prepared using a simple constant potential (CP) electrodeposition technique. On the basis of the unique synthetic procedure and structural advantages, the Pd/PPy-Gns/Pd shows a fast charge/mass transport rate, high electrocatalytic activity, and great stability for formic acid electro-oxidation (FAO). The mass activity of Pd/PPy-Gns/Pd electrode reaches 917 mA·mg−1Pd. The excellent catalytic activity is mainly due to the uniform embedding of Pd nanoparticles on the polypyrrole-graphene (PPy-Gns) support, which exposes more active sites, and prevents the shedding and inactivation of Pd nanoparticles. At the same time, the introduction of graphene (Gns) in the PPy further improved the conductivity of the catalyst and accelerated the transfer of electrons.Keywords:electrodeposition;polypyrrole;Pd nanoparticles;DFAFCs
研究领域:
电化学
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材料科学
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能源技术
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DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
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2023
·Vol. 59
·期 10
·817-829
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IF 1.2
Jiaran Qi,Xu Yongjie,Chu Gang,Liu Xiaohong,Si Youbin
Abstract The widespread use of penoxsulam has increased the potential for environmental risks. In this study, a microbial fuel cell (MFC) was investigated and optimized for degradation of penoxsulam and corresponding power generation performance. Of the electricity producing bacteria tested, Shewanella putrefaciens was found to be the most suitable, and reached a maximum power of 260.4 mW/m 2 along with a penoxsulam degradation efficiency of 95%. MFC electrical performance was greatly enhanced by increasing the anode carbon felt surface area from 5 to 20 cm 2 , which raised the MFC electrical power from 90.3 to 240.3 mW/m 2 and increased the penoxsulam degradation efficiency in parallel. The initial penoxsulam concentration in the reaction system influenced MFC power generation, where higher initial penoxsulam concentrations inhibited microbial activity, decreased the MFC power performance, and reduced the penoxsulam degradation efficiency. In addition, the MFC reaction system pH influenced MFC electrical performance, and adjusting the pH to 8 increased the peak voltage and power density to 0.687 V and 264.8 mW/m 2 , respectively. S. putrefaciens secretes soluble compounds to mediate electron transfer and the addition of Riboflavin (RF) increases the charge transfer efficiency. Our findings provide a basis for revealing the mechanism by which organic contaminants are degraded in MFCs, and demonstrate the feasibility of MFCs for efficient penoxsulam degradation and power generation.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Shengqiu Zhao,Yucong Liao,Rui Wang,Guoliang Liu,Haining Zhang,Haolin Tang
The chemical degradation of proton exchange membranes (PEMs) suffering from radical attack is a crucial issue in the development of proton exchange membrane fuel cells (PEMFCs), while incorporating cerium oxide (CeO 2 ) nanoparticles (NPs) with regenerative redox properties to eliminate radicals could effectively alleviate degradation. However, the low stability and restricted activity of CeO 2 in the PEMFC operating condition and the poor compatibility with PEM due to CeO 2 agglomeration stimulate the urgency for structural modulation of CeO 2 . Achieving a balance of membrane performance and oxidation resistance through a rational surface modification strategy of CeO 2 is important for expanding PEMFC applications. Herein, polyphenols surface functionalized CeO 2 core-shell structure (CeO 2 @TP) were constructed via assembling oxidation-induced coupling tea polyphenols (TP) on CeO 2 NPs. The TP oligomeric shell as a protective layer enhances the stability of CeO 2 , mitigating radical scavenging activity degradation and improving compatibility with PEMs. Physicochemical characterisation shows that the overall performance of the nanocomposite membrane is improved due to the interaction of CeO 2 @TP nanoparticles with the polymer matrix. Gratifyingly, the phenolic hydroxyl-rich reductive TP oligomeric shell accelerates the regeneration of Ce(IV) to Ce(III), increasing the proportion of Ce(III) and oxygen vacancies on the CeO 2 surface, thus boosting antioxidation efficiency. As a result, the CeO 2 @TP-based PEMs exhibited an OCV decay rate of 0.22 mV h −1 , a maximum power density of 1.06 W cm −2 , an H 2 crossover value of 2.18 mA cm −2 , thickness retention (91.1%), and negligible Ce migration after 404 h of accelerated degradation testing. It is proven that the desired consequences of doping antioxidants in PFSA matrix can be intensified by surface modulation of the physicochemical properties of CeO 2 .
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5470
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IF 4.6
Zhiyu Jin,Xiuyang Zou,Guodong Xu,Zhe Sun,Feng Yan
In this work, a thiol–ene coupling reaction was employed to prepare the semi-interpenetrating polymer network AEMs. The obtained QP-1/2 membrane exhibits high hydroxide conductivity (162.5 mS cm−1at 80 °C) with a relatively lower swelling ratio, demonstrating its mechanical strength of 42 MPa. This membrane is noteworthy for its improved alkaline stability, as the semi-interpenetrating network effectively limits the attack of hydroxide. Even after being treated in 2 M NaOH at 80 °C for 600 h, 82.5% of the hydroxide conductivity is maintained. The H2/O2fuel cell with QP-1/2 membrane displays a peak power density of 521 mW cm−2. Alkaline water electrolyzers based on QP-1/2 membrane demonstrated a current density of 1460 mA cm−2at a cell voltage of 2.00 V using NiCoFe catalysts in the anode. All the results demonstrate that a semi-interpenetrating structure is a promising way to enhance the mechanical property, ionic conductivity, and alkaline stability of AEMs for the application of alkaline fuel cells and water electrolyzers.Keywords:anion exchange membranes;semi-interpenetrating network;fuel cells;water electrolyzers
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
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2024
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IF 6.7
Liu Weihao,Liu Qingtao,Wan Xin,Shui Jianglan
Non-precious metal electrocatalysts (such as Fe–N–C materials) for the oxygen (O 2 ) reduction reaction demand a high catalyst loading in fuel cell devices to achieve workable performance. However, the extremely low solubility of O 2 in water creates severe mass transport resistance in the thick catalyst layer of Fe–N–C catalysts. Here, we introduce silicalite-1 nanocrystals with hydrophobic cavities as sustainable O 2 reservoirs to overcome the mass transport issue of Fe–N–C catalysts. The extra O 2 supply to the adjacent catalysts significantly alleviated the negative effects of the severe mass transport resistance. The hybrid catalyst (Fe–N–C@silicalite-1) achieved a higher limiting current density than Fe–N–C in the half-cell test. In the H 2 –O 2 and H 2 –air proton exchange membrane fuel cells, Fe–N–C@silicalite-1 exhibited a 16.3% and 20.2% increase in peak power density compared with Fe–N–C, respectively. The O 2 -concentrating additive provides an effective approach for improving the mass transport imposed by the low solubility of O 2 in water.
研究领域:
材料科学
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电化学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Guorong Chen,Xiaotong Yang,Zixuan Xie,Fengling Zhao,Zhiyou Zhou,Qiang Yuan
In response to the scarcity of precious metals, the development of precious-metal-saving electrocatalysts exhibiting high mass activity (MA) and durability towards oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) for both proton-exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs) has aroused increasing attention. In this study, octahedral Cu-rich PtCu alloy is seeded to fabricate near-surface composition-tunable PtCu hollow octahedral nanoparticles (HONs) with the wall thickness of ~2.1 nm. Due to both the alloying effects of near surface and the special hollow octahedral structure, the PtCu/C HONs exhibit significantly higher MA and durability than commercial Pt/C towards both ORR in alkaline medium and MOR in sulfuric acid electrolyte. The ORR MA of Pt 44.1 Cu 55.9 /C HONs are up to 2.60 A mg Pt −1 that is 18.5-fold enhancement compared with that of Pt/C. Besides, after 10,000 voltage cycles, the MA of Pt 44.1 Cu 55.9 /C HONs remains to be 1.61 A mg Pt −1 , a datum 53.7 times that of Pt/C. The in situ CO polarization curves exhibit that the Pt 44.1 Cu 55.9 HONs/C own high resistance to CO poisoning. For MOR in sulfuric acid electrolyte, the optimum SA/MA of PtCu/C HONs is 5.33 mA cm −2 /1.94 A mg Pt −1 , which is 10.25/5.87 times higher than that of Pt/C. This study provides effective bifunctional cathode and anode electrocatalysts for both PEMFCs and DMFCs.
研究领域:
材料科学
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电化学
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纳米技术
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能源材料
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Ge Chao,Zhiguang Zhang,Zixin Lv,Erqiang Yang,Ruofei Gao,Qing Ju,He Gao,Chengyuan Niu,Huidong Qian,Kang Geng,Nanwen Li
The ether-free aromatic polymer electrolytes have the potential to be used as proton exchange membranes (PEMs) and binders materials in fuel cells. Nevertheless, it is still a technical challenge to improve their mechanical and chemical stability. Here, we prepared a series of quantitatively sulfonated poly(oxindole biphenylene) polymers with common substituent groups (SPOBP n -RPOBP (100-n) , R=F, Cl, Br and NO 2 ) by simply copolymerization. Substituent groups occupy highly active sulfonation sites of polymer, so the sulfonation degree of the polymer is greatly reduced. They show limited water uptake (33–35 wt%) and swelling ratio (10–13 %) compared with fully sulfonated SPOBP 100 (water uptake of 366 wt% and swelling ratio of 78 %) at 80 °C. Thus, the voltage of single-cell assembled with SPOBP 50 -FPOBP 50 membrane remains stable for 90 h at 0.3 A/cm 2 , much higher than that of SPOBP 100 (20 h). Moreover, the cells exhibit similar lifetime trends using it as binder materials in catalyst layer. These results indicate that it is possible to prepare electrolyte with controllable sulfonation degree and high stability by post-sulfonation on copolymers containing substituent groups.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Naeem Akhtar Qaisrani,Waheed Afzal,Usman Khalid,Muther Mansoor Qaisrani,Subhan Azeem,Ali Ahmad,Lingling Ma,Lv Li,Fengxiang Zhang
Anion exchange membranes (AEMs) with high OH - conductivity, good alkaline stability, and dimensional stability are still challenges for AEM fuel cells to be used in practice. In this study, high-performance cross-linked AEMs are developed. To construct the hydrophilic ionic channels, a series of polysulfone-based cross-linked AEMs were prepared utilizing the DABDA cation and two distinct cross-linkers (one with ether and one without ether). The cross-linking process enhanced aggregation of ion clusters, which resulted in the formation of ion-conductive channels and phase-separated hydrophilic/hydrophobic morphology, as well as enhancing the dimensional stability of the AEMs. The produced AEMs demonstrated good conductivity relative to their swelling ratio at 70 °C, and high conductivity in the range of 19.6–46.7 mS/cm between 25 and 70 °C. Additionally, the cross-linked AEMs revealed enhanced alkaline, mechanical and thermal stability. This work presents a promising strategy for developing high-efficiency AEMs for fuel cells.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
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IF 14.9
Yingjie Liu,Xibin Yue,Yongqi Hu,Hui Peng,Guoliang Zhang,Aimei Zhu,Qiugen Zhang,Qinglin Liu
Improving the comprehensive performance of anion exchange membranes (AEMs) has a decisive impact on the wide application of anion exchange membrane fuel cells (AEMFCs). Herein, we prepared a series of new poly(phenanthrene-co-p-terphenyl piperidinium) (PPTP3F x -DIL) AEMs with different fluorinated monomers for high performance AEMFCs. The polymerization of fluorinated monomers with other aryl monomers can effectively promote the separation of microphase in the membrane. It also has a high OH − conductivity at a low swelling. The membrane (PPTP3F 4 -DIL) prepared by polycondensation of 2,2,2-trifluoro-1-(p-tolyl)ethan 1-one monomer achieves a high conductivity of 168.5 mS cm −1 at 80 °C. At the same time, the water uptake is 40.0% and the swelling ratio is 12.1%. In addition, these membranes also have good mechanical properties and alkaline stability. After 1440 h of treatment in a NaOH (2 M) solution at 80 °C, PPTP3F x -DIL still maintains excellent tensile strength (>30.3 MPa) and elongation at break (>43.4%), and the conductivity retention of the PPTP3F 1 -DIL membrane is 90.3%. The PPTP3F 4 -DIL-based single cell exhibits a high peak power density (918.1 mW cm −2 ) and excellent durability (100 h) at 80 °C. Therefore, these PPTP3F x -DIL membranes have a wide range of applications in AEMFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
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IF 5.2
Rui Shi,Yan’an Li,Jiutao Gao,Ziyang Chen,Xin Zhang,Shanlin Zhang,Zaheer Ud Din Babar,Chengxin Li
This study focused on meeting the stringent stability requirements of tubular segmented-in-series solid oxide fuel cells (SOFCs) in reducing and oxidizing atmospheres. To address this challenge, a bi-layer perovskite ceramic interconnect was designed by controlling the oxygen partial pressure, because of the strong correlation between the conductivity of strontium-doped lanthanum titanate (LST) and the oxygen partial pressure. The LST powder was prepared using solid-phase and sol-gel methods, and their influence on particle size and sintering behavior was compared. LST/lanthanum strontium manganite (LSM) bi-layer ceramic interconnects with varying thicknesses were fabricated through screen printing and co-sintering. The results demonstrate favorable interfacial bonding and excellent chemical compatibility between the ceramic layers. The conductivity of the bi-layer interconnect exhibits a temperature-dependent behavior, peaking at 550 °C. Simulation calculations and research findings validate that the conductivity of the bi-layer interconnect is determined by the thickness of the LSM layer and the oxygen partial pressure at the interconnect interface. Optimal conductivity is achieved with a bi-layer interconnect consisting of approximately 15 μm of LST and 4 μm of LSM. This can be attributed to the efficient regulation of oxygen partial pressure at the interface, effectively mitigating LSM decomposition caused by low oxygen partial pressure and the subsequent reduction in conductivity. These results provide valuable fundamental data and methodology for the development of high-performance interconnects for tubular segmented-in-series SOFCs.
研究领域:
材料科学
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能源工程
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陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Shuting Li,Yuanyuan Liu,Changyang Liu,Ke Xue,Liuzhen Bian,Shengli An
Gadolinium-doped ceria (GDC) is the most widely used buffer layer to prevent the reaction between YSZ electrolyte and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) cathode for commercial solid oxide fuel cell (SOFC). However, conductivity and sintering activity are vital to cell performance. In this paper, Ca 2+ and F − co-doped GDC (Ca 0.03 Gd 0.17 Ce 0.8 F 0.06 O 1.84-δ , CGDCF) is used as a buffer layer to improve the performance and stability of SOFC. The co-doped F − and Ca 2+ significantly improve the sintering properties and oxygen ion transport of traditional GDC material. Meanwhile, the optimized sintering temperature is 1300 °C, with the lowest ohmic resistance . The peak power density of a cell with a CGDCF buffer layer reaches 1.809 W cm −2 at 850 °C, which is 37 % higher than that of GDC. In addition, the cell with the CGDCF buffer layer exhibits excellent stability during the 150 h test owing to the lower migration of La and Sr elements. Thus, the Ca 2+ and F − co-doped GDC oxide emerges as a promising material for buffer layer applications.
研究领域:
材料科学
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能源工程
✓ 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）