iScience
·
2022
·
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
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
·
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5296
·
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
✓ 已验证
产品关联
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
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·
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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Ankang Zhu,Guilin Zhang,Tingting Wan,Tingting Shi,Hong Wang,Mingzai Wu,Chunchang Wang,Shouguo Huang,Youmin Guo,Hao Yu,Zongping Shao
Proton-conducting solid oxide fuel cells (H + -SOFCs) have attracted considerable interest recently. However, the overall cell performance of H + -SOFCs is still low due to the lack of a promising cathode material. In this study, SrSc 0.175 Nb 0.025 Co 0.8 O 3-δ (SSNC) was synthesized for evaluation as a cathode material in H + -SOFCs based on a BaZr 0.1 Ce 0.7 Y 0.2 O 3-δ (BZCY) electrolyte. The chemical compatibility and stability of the SSNC cathode with the BZCY electrolyte in humidified air were studied. In addition, the electrochemical behavior of the SSNC cathode on the BZCY electrolyte was investigated using SSNC/BZCY/SSNC symmetrical cells at 600 °C in dry air and humidified air at various H 2 O partial pressures . Promising electrocatalytic activity was observed for the SSNC cathode in humidified air. The area specific resistance obtained on symmetrical cells at 600 °C in a 10% H 2 O-air atmosphere was 0.26 Ω cm 2 . A promising peak power density of 498 mW cm −2 was obtained using an anode-supported cell with a 46 μm-thick BZCY electrolyte layer at 700 °C.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Zhaojie Yang,Minghua Zhang,Zhixin Zhao,Wenting Lan,Xi Zhang,Minmin Fan
Two types of new 2D MXenes (LiF–Ti 3 C 2 T x and NH 4 HF 2 –Ti 3 C 2 T x ) were prepared by selective etching of Ti 3 AlC 2 with LiF/HCl and NH 4 HF 2 aqueous solutions, respectively, and they were introduced as nanofillers into quaternized polysulfone/polyquaternium-10 (QPSU/PQ-10) anion exchange membranes (AEMs) with semi-interpenetrating polymer network, thereby preparing two types of MXene-doped QPSU/PQ-10 AEMs. The resulting MXene-doped QPSU/PQ-10 AEMs have obvious nanoscale microphase-separated morphologies, and their ionic conductivity and power density are significantly improved compared with the pristine QPSU/PQ-10 AEM. Among them, the ionic conductivity and power density of NH 4 HF 2 –Ti 3 C 2 T x MXene-doped AEM can reach 88.76 mS/cm at 80 °C and 106.28 mW/cm 2 at 60 °C, respectively, which are 26.3% and 37.5% higher than those of the pristine QPSU/PQ-10 AEM. Additionally, the MXene-doped QPSU/PQ-10 AEMs with semi-interpenetrating network have moderate water uptake and swelling ratio, excellent thermal and mechanical properties , as well as good oxidation resistance and alkaline stability, which can meet the application requirements of AEMs for fuel cells, exhibiting their bright application prospects in fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhikang Deng,Yongtao Cheng,Jinyao Zhu,Lie Yang,Zulin Zhang,Li Wu
Thiacloprid (THI), as a commonly used neonicotinoid, is frequently detected in environmental media, posing a potential threat to the environment and organisms. In this study, microalgae fuel cells (MFCs) with Chlorella sp. as cathode and wastewater (with sludge) as anode were constructed to remove THI (10, 20 and 50 mg/L) while generating bioelectricity . The results showed that, comparing with the open-circuit condition, the generation of bioelectricity (closed-circuit) significant enhanced the removal of THI by 13.14–32.47%. The presence of low concentration of THI (10–20 mg/L) did not significantly affect the accumulation of Chlorella sp. biomass, while high concentration THI (50 mg/L) strongly depressed its biomass. It was also found that high concentration THI caused obvious oxidative damages (MDA) to Chlorella sp., although SOD activity was upregulated. Both the highest THI removal efficiency (%) and stable bioelectricity voltage (202 mV) occurred at the low THI concentration (10 mg/L). Seven degradation products of THI were identified and the oxidation of the thiazole ring was the main detoxification way of THI. Additionally, toxicity evaluation also showed that the toxicity of degradation products were lower than THI. This study implies that MFCs could be a promising application, coupling pollutants removal , bioenergy generation and biomass production.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Ziyu Zhang,Chang Liu,Yunkun Dai,Bo Liu,Pan Guo,Fengdi Tu,Miao Ma,Lixiao Shen,Zigang Zhao,Yangyang Liu,Yunlong Zhang,Lei Zhao,Zhenbo Wang
Carbon supports for cathodic catalysts in proton-exchange membrane fuel cells suffer from rapid corrosion and instability; therefore, alternative supports with a stable structure and a high electric conductivity are highly required. In this paper, a three-dimensional support hybridized by MXene and Ketjen Black is developed, in which Ketjen Black is sandwiched between MXene nanosheets (MCM). After decorating with Pt nanoparticles by a facile wet-chemical approach, a three-dimensional (3D) Pt/MCM catalyst is obtained. The intercalated Ketjen Black prevents the stacking of MXene nanosheets, thus increasing the specific surface area of the catalyst and exposing the active sites. The strong interaction between functionalized MXene nanosheets and Pt nanoparticles further enhances its intrinsic electrocatalytic activity. Pt/MCM demonstrated encouraging ORR activity with the half-wave potential and specific activity of 0.892 V and 0.377 mA·cm–2, respectively, surpassing the state-of-the-art Pt/C catalysts. Especially, Pt/MCM achieves ultrahigh durability with a 1 mV decrease in half-wave potential and a 1.73% decrease in mass activity after an accelerated durability test. Given the performance and structure–activity relationships of Pt/MCM, it holds great potential for various energy and catalysis-related applications.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Huan Li,Chaoxiang Su,Chaoqi Wang,Zhe Lü
In this work, we report FeCo 2 O 4 - x Ce 0.8 Sm 0.2 O 1.9 ( x = 0, 30, 40, 50, 60, 70 wt%), catalyst/electrolyte composite oxides , as cathode materials for application in solid oxide fuel cells. Herein a systematic investigation represents the effect of Ce 0.8 Sm 0.2 O 1.9 incorporation on physical and electrochemical properties . The obtained results indicate that the addition of Ce 0.8 Sm 0.2 O 1.9 to form FeCo 2 O 4 –Ce 0.8 Sm 0.2 O 1.9 composite material plays a key role in physical and electrochemical properties. Among all the components, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has the lowest polarization resistance of ∼0.094 Ω cm 2 at 800 °C in air, which is much smaller than that of the FeCo 2 O 4 cathode (4.18 Ω cm 2 ). In comparison with the FeCo 2 O 4 cathode, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has a better electrocatalytic activity and a larger power density of 397 mWcm −2 based an electrolyte-supported single-cell configuration at 800 °C. The oxygen partial pressure dependence studies indicate that rate limiting steps of the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode are the adsorption process of the molecular oxygen on the electrode surface and the charge-transfer process. In consequence of these superior properties, it is reasonable to believe that the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 oxide has great potential to become a cathode material for solid oxide fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）