MODERN PHYSICS LETTERS B
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2023
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IF 1.9
Bin Wang,Miao Tang,Wanting Li,Wenjing Dong,Xiaowen Ge,Naibao Huang
In order to increase the activity and decrease the cost of oxygen reduction reaction (ORR) catalyst, S self-doped porous carbon nanospheres ORR catalyst was prepared by pyrolyzing the block copolymer F127 grafted with 3-mercapto-propanoicaci. The composition and microstructure were characterized and its electrochemical performance was also investigated in O 2 -saturated 0.1 M KOH solutions. The results showed that, among all the obtained samples, C-S-750 had a porous carbon nanosphere structure with the doped sulfur of 7.08 at % and a maximum specific surface area of 776.3 m 2 /g. The onset potential, half-wave potential and limiting current density of C-S-750 were 0.92 V (versus RHE) and 0.80 V (versus RHE) and 5.77 mA/cm 2 @0.45 V in O 2 -saturated 0.1 M KOH solution, respectively, which were close to that of commercial 20% Pt/C catalysts. This provides a new way to introduce and increase the doped heteroatom in metal-free ORR catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Ting Huang,Jinhui Wei,Xiaoting Zhu,Enren Zhang
The development of microbial fuel cells (MFCs) into a new type of carbon-neutral wastewater treatment technology requires efficient and low-cost oxygen reduction reaction catalysts in air cathodes. The use of raw soybean powder was investigated for synthesizing Fe–N–C ORR catalysts in a sacrificial SiO 2 support method. ZnCl 2 etching in the synthesis was found to facilitate the formation of hierarchical porous structures of Fe–N–C catalysts. Fe–N–C(1-1) catalyst synthesized with an optimal soybean/ZnCl 2 mass ratio of 1:1 exhibited the highest ORR activity in air cathodes. The use of the obtained Fe–N–C(1-1) catalyst enables a maximum power production of ~0.480 mW cm −2 in MFCs, higher than commercial Pt/C (0.438 mW cm −2 ) with the same catalyst loading of 2 mg cm −2 . Long-term MFC operations demonstrated that the Fe–N–C synthesized from raw soybean have high stability and toxic tolerance, indicating that abundant low cost soybean biomass is a potential material for ORR catalyst development in MFC applications.
研究领域:
环境科学
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能源材料学
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DOI
高影响因子
Energy Technology
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2019
·Vol. 8
·期 1
·1900896
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IF 3.163
Mengyao Lv,Fenghui Fan,Longhai Pan,Hangjia Shen,Erum Pervaiz,Jiacheng Wang,Minghui Yang,Jun Wang
Fabrication of an oxygen reduction reaction (ORR) catalyst is the key to an efficient and fast electrocatalytic process in a fuel cell for energy conversion. A reasonable strategy for the synthesis of electrocatalysts is one of the most promising ways for developing precious metal-free ORR catalysts. Herein, the synthesis of a highly active Fe 3 O 4 -based catalyst using a facile molten salts method is proposed. The electrocatalytic analysis shows superior ORR performance with an admirable half-wave potential ( E 1/2 = 0.83 V), comparable with the commercial 20 wt% Pt/C. In contrast, primary Zn–air battery, using synthesized Fe,S–N–C as an air-cathode, displays an open-circuit potential of 1.44 V and a high power density of 84.3 mW cm −2 .
研究领域:
材料科学
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电化学
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能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
Carbon Letters
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2024
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IF 5.5
Long Qing,Wu Qianqi,Wen Zhiming,Wang Wei,Li Chen,Tang Huichuan,Wang Haitao,Huang Junlin,Chen Liang,Li Gangyong,Xu Wenyuan
Considering the intrinsic activity of non-precious metal oxygen reduction reaction (ORR) catalysts is typically lower than that of precious metal catalysts, it is crucial to focus on the rational design of their micro-morphology and active site. This paper employed a simple molten salt-mediated template method to fabricate a Fe 3 C composite N-doped C catalyst with a layered porous framework (Fe 3 C@NC). Tannic acid was utilized to form a strong coordination with iron to limit the grain size of Fe 3 C nanocrystals generated by high-temperature pyrolysis. Moreover, urea achieved nitrogen doping in tannic acid-derived porous carbon, while the graphite phase nitrogen-doped carbon (g-C 3 N 4 ) formed by its pyrolysis, together with the molten salt-mediated environment, jointly controlled the two-dimensional sheet-like structure of the material. The optimized Fe 3 C@NC-800 demonstrated efficient ORR performance, with an ORR half-wave potential of 0.883 V. Its application as a cathode catalyst in a liquid zinc-air battery (ZABs) exhibits a maximum power density of 211.5 mW cm −2 , surpassing that of a Pt/C-based ZAB and indicating the potential practical utility of this material.
研究领域:
材料科学
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能源化学
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电催化
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 4
·795-806
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IF 12.958
Li Daohao,Long Xiaojing,Wu Yaqian,Hou Huijie,Wang Xueyao,Ren Jun,Zhang Lijie,Yang Dongjiang,Xia Yanzhi
Developing low-cost, efficient oxygen reduction reaction (ORR) catalysts to replace Pt-based materials is urgently required for the application of Zn-air batteries (ZABs) and microbial fuel cells (MFCs). In this work, meso-microporous carbon fibers with tunable defect density were synthesized by carrageenan fibers. A highly defective carbon fiber (HDCFs) was produced which exhibited an outstanding ORR catalytic activity, reaching to the half-wave potential of 0.841 and 0.44 V in alkaline and neutral electrolytes, respectively. These HDCFs can also act as highly efficient air cathodes for ZABs (delivered potential of 0.69 V and power density of 220 mW cm –2 at 300 mA cm –2 ) and MFCs (high power density of 69.7 mW cm –2 ). Simulation by the density functional theory indicated that a high density of defections in a carbon based framework can remarkably modulate the electrical properties. For instance the charge entrapments in the carbon active sites may reduce the energy barrier of ORR. Graphical abstract
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Quanxiong Lu,Jiajia Tai,Xianliang Song
Direct lignin fuel cells (DLFC) are one of the important forms of high value-added utilization of lignin. In this study, lignin was studied not only as a fuel but also as a catalyst. Specifically, Kraft lignin was modified with ZnCl 2 , KOH and THF (Tetrahydrofuran) respectively, and added to the catalyst after activation. The results of scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometer (EDS), Brunauer − Emmett − Teller (BET), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR) and Raman spectra shown that AL/FePc-NrGO (activated lignin/iron phthalocyanine/nitrogen-doped reduction of graphene oxide) three-dimensional composite catalyst has been synthesized. The results showed that KOH-activated Kraft lignin had the best performance as an oxygen reduction reaction (ORR) catalyst, with a half-wave potential (E 1/2 ) of 0.73 V and a limiting diffusion current density of 4.3 mA cm −1 . The THF-modified catalyst showed similar stability and methanol resistance to 20 % Pt/C at ORR. The ORR catalyst applied to the DLFC has the best electrical performance with an open circuit voltage (OCV) was 0.53 V and the maximum power density it could reach 95.29 mW m −2 when the catalyst was modified with THF. It is encouraging that the AL/FePc-NrGO catalyst has better-generated electricity performance than 20 % Pt/C. This work has provided a new idea for developing non-noble metal catalysts and studying direct biomass liquid fuel cells.
研究领域:
能源材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
CARBON
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2018
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IF 7.082
Zhe Wang,Dan Cheng,Chang Chen,Kebin Zhou
Hierarchically porous materials have drawn extensive attention to construct effective air cathodes in newly developed zinc-air batteries. Here, we successfully fabricated hierarchically porous carbon microspheres (HCMs) with fully open and interconnected super-macropores by a strategy of high internal phase W/O/W double emulsions (HIPDEs). The as-prepared HCMs-supported platinum nanoparticles (Pt/HCMs) were employed as novel ORR catalysts for the air cathodes of Zn-air batteries. It was found that Pt/HCMs promised a nearly 100% Pt utilization and showed a higher current density and better durability than the commercial Pt/C on rotating disk electrode (RDE) setup and gas diffusion electrode (GDE)-based half-cell configurations, highlighting the importance of the fully open and interconnected super-macropores for improving the gas/liquid phases transport. Benefiting from the superior mass transfer, the Pt/HCMs-based Zn-air battery delivered high power density (190 mW cm −2 ) and specific capacity (800 mA h g Zn −1 ) comparable to that of the commercial Pt/C-based battery. This study presents a new avenue to engineer catalyst to boost the performance of Zn-air batteries.
研究领域:
材料科学
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电化学
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能源存储
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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）