CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xianda Sun,Yinshi Li,Chao Xie,Mingsheng Hao,Mingjia Li,Jinling Xue
The uniform pH reaction environment of both acid proton-exchange membrane and alkaline anion-exchange membrane direct liquid fuel cells (DLFCs) substantially lowers the cell performance. Herein we propose a high-performance pH-disparate DLFC (ΔpH-DLFC), which can harvest the neutralization energy to maximize the thermodynamic voltage of DLFCs. Benefiting from the construction of oxygen-electrolyte interfaces, the triple-phase boundary density of cathode is significantly increased. The ΔpH-DLFCs yield peak power densities of 279, 341 and 610 mW cm −2 when methanol, ethanol and sodium formate are fed into the anode respectively. The stable operation of direct formate fuel cell at 200 mA cm −2 for 24 h further confirms the feasibility of the ΔpH-DLFCs. Moreover, the flexibility of the ΔpH-DLFC in oxidants and catalysts was also investigated. The experimental result indicates that the air-based pH-disparate direct formate fuel cell with non-platinum catalyst obtains a peak power density of 140 mW cm −2 at 80 °C, suggesting the great potential for practical application.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 7
·F663
·
IF 3.014
Yinshi Li,Yaling He
Contrary to the conventional layer-separated electrode design, we report a metal foam-based all-in-one electrode that incorporates the flow field, backing layer, micro-porous layer, and catalyst layer into a whole. This innovative design facilitates the mass and charge transport as well as extends the three-phase boundary, thereby enabling to miniaturize the cell system while enhance the power output. It has been demonstrated that when applying a pair of 4.0 × 4.0 × 0.5 mm (length × width × height) all-in-one electrodes to the liquid-feed micro polymer electrolyte membrane fuel cell, the peak power density goes up to 123 mW cm−2 even at room temperature, which is much higher than that of the conventional cell system. The present architecture design meets the potential demand of the high-capacity lab-on-a-chip applications.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Chengguo Yin,Yingzhou Guan,Zhe Zhu,Xishuang Liang,Biao Wang,Quan Diao,Han Zhang,Jian Ma,Fengmin Liu,Yanfeng Sun,Jie Zheng,Geyu Lu
In this article, the NO 2 sensing performance of the mixed-potential-type yttria stabilized zirconia (YSZ)-based sensor was improved by modifying the three-phase boundary (TPB). The double-tape casting and the pore-forming method were simultaneously used to obtain the porous YSZ-substrate. Furthermore, a group of tape-casting slurries with different starch concentrations (0 wt%, 5 wt%, 10 wt% and 15 wt%) were applied to form the different contact areas of the three-phase boundary (TPB). The scanning electron microscope (SEM) images showed that YSZ-substrate prepared by using the slurry with 15 wt% starch had the largest contact area. The sensor based on the YSZ-substrate with the largest contact areas and the MnCr 2 O 4 sensing electrode (SE) showed the largest response compared with the other sensors when they were exposed to 10–500 ppm NO 2 at 800 °C. The measured polarization ( I – V ) curves indicated that the present sensors operated under the mixed-potential mechanism. In addition, the sensor showed a good selectivity and repeatability to NO 2 .
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 41
·22304-22319
·
IF 11.9
Chao Yang,Ran Guo,Yu Wu,Baowei Pan,Jiatang Wang,Jinliang Yuan
Low performance, durability and degradation-related issues are major challenges in the long-term operation and commercialization of reversible solid oxide cells (rSOCs). One solution is to develop symmetrically structured electrodes with integrated functional layers composed of gradient pores, to enhance thermo-mechanical compatibility, mass transport processes and electrochemical reactions. It is critical to understand the graded nanoparticle migration and sintering behaviors during rSOC preparation. In this study, a sub-micron scale of the graded nanoparticle system for yttrium stabilized zirconia (YSZ) and perovskite catalyst (La0.75Sr0.25Cr0.5Mn0.5O3−δ, LSCM) materials, together with a YSZ dense electrolyte layer, is modeled by a coarse-grained molecular dynamics method, aiming to address the sintering mechanism and important parameters affecting the graded YSZ skeleton and YSZ/LSCM composite layer in a two-step sintering process. The diffusivities of LSCM and YSZ decrease by 57.4% and 80.5% in the second-step sintering. The two-step sintering process is more appropriate for preparing graded porous structures with a higher triple-phase boundary length than the one-step process (the so-called co-sintering). A lower stress (250–410 MPa) is obtained in the two-step sintering compared with that (680 MPa) predicted in the co-sintering, avoiding the excessive densification and mechanical fault caused by plastic flow under high stress. 900–950 °C is appropriate in the second-step sintering to form a gradient porous LSCM/YSZ layer with a higher triple-phase boundary length. A mass fraction of YSZ > 0.6 may cause a too dense skeleton in the first-step sintering and then suppress the gradient pores and triple-phase boundary formed in the second-step sintering.
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
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yanqi Li,Han Li,Bingbing Sun,Jie Zheng,Tian Xu,Yuan Liu,Xiaorong Zhu,Shiqi Zhang,Sisi Liu,Ming Ge,Xiaolei Yuan
As a critical component for the oxygen reduction reaction (ORR), platinum (Pt) catalysts exhibit promising catalytic performance in High-temperature-proton exchange membrane fuel cells (HT-PEMFCs). Despite their success, HT-PEMFCs primarily utilize phosphoric acid-doped polybenzimidazole (PA–PBI) as the proton exchange membrane, and the phosphoric acid within the PBI matrix tends to leach onto the Pt-based layers, easily causing toxicity. Herein, we first propose UiO-66@Pt3Co1-T composites with precisely engineered interfacial structures. The UiO-66@Pt3Co1-T exhibits an octahedral porous framework with uniform structural dimensions and even distribution of surface nanoparticles, which demonstrate superior ORR performance compared to commercial Pt/C. The unique structure and morphology of the composites also exhibit a favorable half-wave potential in different concentrations of phosphoric acid electrolyte, regulated by the phosphoric acid adsorption site and intensity.This finding suggests that the incorporation of Co could effectively modulate the Pt d-band center, thereby enhancing the ORR performance. Furthermore, the selective adsorption of phosphoric acid by ZrO2 enables precise control over the phosphoric acid distribution. Notably, the retention of the octahedral framework post high-temperature treatment facilitates the establishment of dual transport pathways for gases and protons, leading to a stable and efficient triple-phase boundary.
研究领域:
材料科学
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化学工程
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2020
·
IF 6.082
Chao Yang,Xiuhui Jing,He Miao,Jingxiang Xu,Peijian Lin,Ping Li,Chaoyu Liang,Yu Wu,Jinliang Yuan
Reversible solid oxide fuel cell (rSOFC) can produce and store energy through dual-mode operating, which is promising for balancing the conflicts between power supply and requirements. One crucial issue is to develop high performance of fuel electrode materials, in terms of materials costs, mechanical strength, mass production in commercialization . The reversible performance of the materials may be enhanced by electrode microstructure optimization in the preparation procedures. It is beneficial to understand the mechanisms of sintering process , in terms of the electrode particle interactions and sintered structure in the molecular/nanoparticle level. Accordingly, a molecular dynamics method is developed to simulate the sintering process for the LST/GDC nanoparticle systems. It is found that a high sintering temperature is beneficial for increasing triple-phase-boundary (TPB) length, but not for the effective surface area of catalyst particles . A mass fraction of 0.5–0.6 is predicted as the optimal LST composition for the TPB length, active surface area, and compatible thermal expansion coefficient . The heat capacity and thermal conductivity increase in the high sintering temperature and high mass fraction of LST conditions. The methodology and findings can provide a guideline on optimization of the sintering conditions for LST/GDC electrodes, which may promote the commercialization of rSOFC technology .
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
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1251-1257
·
IF 2.726
Li Yang,Wang Xian,Liu Jie,Jin Zhao,Liu Changpeng,Ge Junjie,Xing Wei
In this work, the effect of Nafion ionomer content on the structure and catalytic performance of direct CO polymer electrolyte membrane fuel cell(CO-PEMFC) by using Rh-N-C single-atom catalyst as the anode catalyst layers was studied. The ionic plaque and roughness of the anode catalyst layers increase with the increase of Nafion ionomer content. Furthermore, the contact angle measurement results show that the hydrophilicity of the anode catalyst layers also increases with the increase of Nafion ionomer content. However, when the Nafion ionomer content is too low, the binding between microporous layers, catalyst layers and membrane cannot meet the requirement for either electric conductivity or mass transfer. While Nafion ionomer content increased above 30%, the content of water in anode is difficult to control. Therefore, it was found that AN 30(30% Nafion ionomer content of anode) is the best level to effectively extend the three-phase boundary and improve CO-PEMFCs performance.
研究领域:
能源材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Shidong Song,Dequan Zhang,Yanli Ruan,Limei Yu,Yongqiang Xu,Joykumar Thokchom,Donghai Mei
Heightened attention for solid-state Li–O2 batteries (SSLOBs) exists due to their improved safety, wider electrochemical window, and high energy density in addition to the solid electrolyte’s innate capability of suppressing Li dendrite penetration and shielding the Li metal anode from oxygen, CO2, and moisture in the air, in comparison with the conventional Li–O2 batteries using liquid organic electrolytes. Herein, a cathode supported quasi-SSLOB with an integrated composite polymer-based architecture (ICPA) is developed with reduced interfacial resistance, extended triple-phase boundaries (TPBs) for Li–O2 reactions, and a thin film solid-state electrolyte. The Li–O2 cell with ICPA (denoted as ICPA cell) exhibits a lower charge transfer impedance than its counterpart with the same composite polymer electrolyte (CPE) but a nonintegrated structure (termed the CPE cell). The former shows reduced interfacial impedance between electrolyte and cathode and increased TPBs. Furthermore, the ICPA cell delivers higher discharge capacity, lesser capacity decay, and significantly lower impedance rise after cycles than the CPE cell, ascribed to the continuous Li-ion transport in ICPA and the resulting more efficient discharge and charge processes. Under a limited capacity cycling protocol of 300 mAh g–1, the ICPA cell achieves excellent reversibility for 78 cycles, remarkably surpassing the CPE cell which only performs 44 cycles in addition to showing half of the after-cycle impedance compared to that for the CPE cell. Nonetheless, the same composite polymer electrolyte used for both CPE- and ICPA-based cells demonstrates excellent stability toward Li metal after long-term cycling. These findings manifest that the design and application of cathode supported SSLOB with ICPA can be a promising approach to achieve high-performance Li–O2 batteries.
研究领域:
材料科学
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电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yi Zhang,Feng Ji,Chengwei Deng,Jing Li,Weiwei Cai,Hansong Cheng
Polytetrafluoroethylene (PTFE) is the most widely used catalyst layer (CL) binder in a polybenzimidazole phosphoric acid (PBI–PA)-based high-temperature proton exchange membrane fuel cell (HT-PEMFC) due to its great hydrophobicity. However, PTFE also limits the formation of an effective triple-phase boundary (TPB) due to its strong resistance to acid retention. To obtain the composite ionomer in the CL of HT-PEMFC, polybenzimidazole (PBI) is thus invited. Then, an in situ quaternization strategy on PBI is developed to increase the TPB concentration in CL by controlling the PA distribution and taking into account the superior PA retention capability of quaternary ammonium groups. At the same time, Pt active sites can be freed and mass transfer channels can be in situ constructed. Consequently, the corresponding HT-PEMFC fed with H2/O2 attains a maximum power density of 755 mW/cm2 and an electrochemical surface area of 35.56 cm2/mgPt, surpassing those equipped with PTFE by 10 and 30%, respectively. The electrochemical performance improvement indicates that the in-situ quaternization strategy on the ionomer has great application potential in practical HT-PEMFC manufacturing.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Siyuan Lv,Yueying Zhang,Li Jiang,Lianjing Zhao,Jing Wang,Fangmeng Liu,Chenguang Wang,Xu Yan,Peng Sun,Lijun Wang,Geyu Lu
A mixed potential type yttria-stabilized zirconia (YSZ)-based NO 2 sensor attached with NiO sensing electrode (SE) with efficient three-phase boundary (TPB) processed by electrospinning technology was fabricated. The effect of the structure and area of TPB on the gas sensing performance of the sensor was investigated systematically. The YSZ nanofiber array was directly deposited on YSZ substrate by electrospinning method to construct efficient three-dimensional TPB. The sensor (S30) based on YSZ substrate processed by electrospinning method with the flow rate of 1.5 mL/h for 15 min and NiO-SE exhibited the highest sensitivity (77.4 mV/decade) to 5–500 ppm NO 2 at 510 °C, which was 2.6 times as the sensor (S00) with unprocessed YSZ substrate. The response value of S30 to 100 ppm NO 2 could reach 109 mV at 510 °C, which increased about 51 mV comparing with S00. Moreover, the sensor (S30) also displays fast response and recovery rates, good repeatability, excellent selectivity, moisture resistance and long-term stability. The elevated NO 2 sensing performance of the sensor is attributed to more active sites of electrochemical reactions by increased area of three-dimensional TPB.
研究领域:
材料科学
·
传感技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Qichao Liang,Fei Lu,Farhat Shakeel,Xueying Wang,Yilin Sun,Jiefang Wang,Hai Huang,Jinrui Su,Bin Cai
The porous structure of anodes is crucial to the performance of intermediate-temperature solid state fuel cells (IT-SOFCs). With the rapid development of high performance cathodes, the role of anodes needs to be considered again. A hierarchical porous Ni-Ce 0.8 Sm 0.2 O 2-δ (SDC) anode consisted of ∼200 nm width, and ∼800 nm and ∼10 μm diameter pores can be formed by reducing NiO, and burning of polymethyl methacrylate (PMMA) and starch pore-formers with a total load of 20 wt%, respectively. For single cells with Ni-SDC|SDC|Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ configuration, the peak power density (PPD) (0.26–1.73 W·cm −2 ) at 723–923 K is achieved with the addition of 10 wt% starch + 10 wt% PMMA, which is 136–52 % and 86-14 % higher than that without pore-formers and with 20 wt% starch, respectively. More importantly, it has a similar long-term stability of the cell without pore-formers. The comprehensive results suggest that the apparent improvement in PPDs is primarily attributed to the increased length of effective three-phase boundaries due to the formation of a percolation network of anodes, while also highlighting the significant influence of anode/electrolyte interface polarization on the electrochemical performance of IT-SOFCs.
研究领域:
材料科学
·
电化学
·
能源材料
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2022
·Vol. 8
·期 44
·
IF 14.957
Yu-Cheng Wang,Wen Huang,Li-Yang Wan,Jian Yang,Rong-Jie Xie,Yan-Ping Zheng,Yuan-Zhi Tan,Yue-Sheng Wang,Karim Zaghib,Li-Rong Zheng,Shu-Hui Sun,Zhi-You Zhou,Shi-Gang Sun
The rational design of non-Pt oxygen reduction reaction (ORR) catalysts and catalyst layers in fuel cells is largely impeded by insufficient knowledge of triple-phase boundaries (TPBs) in the micropore and mesopore ranges. Here, we developed a size-sensitive molecular probe method to resolve the TPB of Fe/N/C catalyst layers in these size ranges. More than 70% of the ORR activity was found to be contributed by the 0.8- to 2.0-nanometer micropores of Fe/N/C catalysts, even at a low micropore area fraction of 29%. Acid-alkaline interactions at the catalyst-polyelectrolyte interface deactivate the active sites in mesopores and macropores, resulting in inactive TPBs, leaving micropores without the interaction as the active TPBs. The concept of active and inactive TPBs provides a previously unidentified design principle for non-Pt catalyst and catalyst layers in fuel cells.
研究领域:
燃料电池
·
催化
·
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）