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长期以来,碳材料负载高分散的铂催化剂及其合金材料一直是商业化质子交换膜燃料电池(PEMFC)中氧还原反应和氢氧化反应十分有效的催化剂。但由于Pt基催化剂成本高、电化学条件下稳定性差、易CO中毒以及氧还原反应(ORR)动力学迟缓等一系列问题,阻碍了其在燃料电池中的进一步应用和大规模生产。相比之下,氮掺杂碳纳米材料具有低成本、高活性、高稳定性、环境友好等特点,这些优异的性能使其在燃料电池领域有着广阔的应用前景。结合近几年国内外研究现状,综述了原位掺杂法、后掺杂合成法和直接热解法等3种氮掺杂碳纳米材料的制备方法,并分析了各自的优点和不足之处,及其作为ORR催化剂的研究进展。最后,对未来氮掺杂碳纳米材料催化剂研究的主要发展方向进行了展望。 相似文献
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利用分散聚合法,在玻璃基体表面原位聚合沉积得到透明导电聚苯胺(PANI)薄膜,考察了反应条件对PANI薄膜形貌、电导率等性能的影响。结果表明,反应温度选用冰水浴(0℃),氧化聚合反应温和,薄膜质量高;氧化剂APS(过硫酸铵)加入方式的细化,有利于改善薄膜的表观形貌和电导率;利用硅烷偶联剂OTS(十八烷基三氯硅烷)处理玻璃表面,得到的PANI薄膜更加细密均匀,电导率也显著提高;换用磷酸为掺杂酸,得到的PANI薄膜表观质量差,电导率低。 相似文献
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采用简单、无模板的方法制备了氮掺杂多孔石墨烯/碳复合材料(NPGC)。采用SEM、XRD、Raman、XPS等分析手段对NPGC的形貌、组成以及结构进行了表征,利用旋转圆盘电极技术测试了其电催化氧还原反应(ORR)活性。结果表明,葡萄糖在水热后生成的碳与石墨烯成功复合,并在950℃炭化、活化后形成了相互渗透、结构良好的三维片状多孔网络结构;其氮含量高达9.47%。NPGC作为一种高效的非金属ORR电催化剂,在碱性溶液中具有较高的起始电位[0.87 V(vs RHE)]和较大的极限电流密度(4.7 mA?cm?2),以及其ORR平均转移电子数为3.8。与商业Pt/C催化剂相比,NPGC具有较强的耐甲醇性和长期耐久性,且制备成本较低,具有广阔的应用前景。 相似文献
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碳材料是目前研究和应用最为广泛的一类无机非金属材料。本文从研究应用角度出发,综述了近年来国 内外对氮掺杂碳材料结构与性能的研究实验和理论成果,简述了氮原子掺杂对碳材料电导率、场发射性能、超 级电容性能、氧还原催化性能、其他催化性能、储氢性能6 个方面的影响。指出氮原子掺杂碳材料的制备和性 能研究具有重要的研究价值和应用潜力,氮原子掺杂可以大幅提高碳材料的电化学及催化性能,并赋予其某些 奇异的特性,因此通过调控氮掺杂量可以有效控制掺杂材料的形貌和导电性,得到适合不同应用的掺杂产物, 有望为基于碳材料的电子设备及催化过程效能的提高开辟新的道路,并指出氮原子掺杂碳材料将成为纳米材料 领域的新热点。 相似文献
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前 言氯气中氢、氧、二氧化碳等含量是氯氢处理过程中较重要的控制指标。文献报道的测氢方法有燃烧法、爆炸法等 ,也有吸收完氯气后用色谱法测定剩余气体中氢、氧、氮的方法。笔者采用气相色谱法分析氯气中氢、氧、氮、二氧化碳的含量 ,对色谱气路系统做了一些改造 ,样品气体经浓硫酸干燥后直接进样 ,几种组分可一次检出 ,方法简便、快捷、可靠。1 实验部分1 1 仪器与试剂仪器 :日本岛津GC - 1 4B气相色谱仪 ,带气体进样器 ,CLASS -GC1 0色谱工作站。试剂 :浓硫酸 (98% ) ,2 0 %氢氧化钠溶液 ,气体标准样 (北京华元气体化工公… 相似文献
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Guo-Jun Zhang Yoshihisa Beppu Motohide Ando Jian-Feng Yang Tatsuki Ohji 《Journal of the American Ceramic Society》2002,85(11):2858-2860
This work proposes a new approach, based on the reaction Si3 N4 + 2B2 O3 + 9C → 3SiC + 4BN + 6CO, to synthesize an SiC–BN composite. The composite was prepared by reactive hot pressing (RHP), at 2000°C for 60 min at 30 MPa under an argon atmosphere, following a 60 min hold at 1700°C without applied pressure before reaching the RHP temperature. TG-DTA results showed that a nitrogen atmosphere inhibited denitrification somewhat and retarded the reaction rate. The chemical composition of the obtained material was consistent with theoretical values. FE-SEM observation showed that in situ -formed SiC and BN phases were of spherical morphology with very fine particle size of ∼100 nm. 相似文献
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Raghavarapu Venkata Krishnarao Mahadev Malhar Godkhindi 《Journal of the American Ceramic Society》1991,74(9):2315-2317
Diffusion bonding of dense Si3 N4 containing 10% Ce2 O3 , 7% A12 O3 , and 2% Y2 O3 was attempted through hot pressing at temperatures of 1000° to 1400°C. Physically vapor-deposited (PVD) carbon and paraffin-wax candle soot were tried as interlayers. The interfaces were analyzed through optical and scanning electron microscopy, and through X-ray photoelectron spectroscopy. The bonding temperature could be reduced from 1400° (without interlayers) to 1100°C with PVD carbon or candle soot. From C Is and Si 2p spectra, the formation of SiC at the interface through the reaction of C with the silicon oxynitride layer has been identified. 相似文献
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研究了分散剂加入量,球磨时间,料浆固相含量,料浆PH值对含烧结助剂α-Al2O3,Y2O3的氮化硅浆的流变性能的影响。 相似文献
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Elevated-Temperature Mechanical Properties of Silicon Nitride/Boron Nitride Fibrous Monolithic Ceramics 总被引:1,自引:0,他引:1
A unique, all-ceramic material capable of nonbrittle fracture via crack deflection and delamination has been mechanically characterized from 25° through 1400°C. This material, fibrous monoliths, was comprised of unidirectionally aligned 250 μm diameter silicon nitride cells surrounded by 10 to 20 μm thick boron nitride cell boundaries. The average flexure strengths of fibrous monoliths were 510 and 290 MPa for specimens tested at room temperature and 1300°C, respectively. Crack deflection in the BN cell boundaries was observed at all temperatures. Characteristic flexural responses were observed at temperatures between 25° and 1400°C. Changes in the flexural response at different temperatures were attributed to changes in the physical properties of either the silicon nitride cells or boron nitride cell boundary. 相似文献
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Masateru Nakamura Kiyoshi Hirao Yukihiko Yamauchi Shuzo Kanzaki 《Journal of the American Ceramic Society》2001,84(11):2579-2584
A silicon nitride ceramic with unidirectionally aligned β-Si3 N4 elongated grains (UA-SN) was fabricated by sintering the extruded Si3 N4 green body with a small amount of rodlike β-Si3 N4 seed. The effect of anisotropy in microstructure on tribological properties was investigated, compared with a fine-grained Si3 N4 without seed. Block-on-ring tests without lubricant were conducted at sliding speeds of 0.15 and 1.5 m/s, with a normal load of 5 N and a sliding distance of 75 m, using the UA-SN and Si3 N4 without seeds as block specimens and commercially supplied Si3 N4 as ring specimens. For UA-SN, tribological properties were evaluated in three directions with respect to the grain alignment: the plane normal to the grain alignment, and in the direction parallel to or perpendicular to the grain alignment in the side plane. For both sliding speeds, the plane normal to the grain alignment exhibited the highest wear resistance, and the worn surface of this plane was quite smooth, in contrast to the other specimens whose surfaces were irregular owing to grain dropping. It is considered that the high wear resistance achieved in this plane is attributable to the inhibition of crack propagation along the sliding surface by the stacked elongated grains normal to the sliding surface. 相似文献
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Simon J. P. Durham Kartik Shanker Robin A. L. Drew 《Journal of the American Ceramic Society》1991,74(1):31-37
Conditions for carbothermal synthesis of α-Si3 N4 are presented with special emphasis on the reaction temperature, C:SiO2 ratio, and precursor mixing. With pure precursors, the conversion temperature is 1500° to 1550°C. An excess of C is necessary for complete conversion, and a simple sol–gelmixing technique provides excellent intermixing of the precursors. Copious flow of N2 gas throughout the reactor bed is essential if pure Si3 N4 is to be produced; small concentrations of CO and O2 promote SiC and Si2 N2 O, respectively. 相似文献
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Young-Hag Koh Hae-Won Kim Hyoun-Ee Kim 《Journal of the American Ceramic Society》2002,85(11):2840-2842
A three-layered composite, composed of a strong outer layer (monolithic S3 N4 ) and a tough inner layer (fibrous Si3 N4 /BN monolith), was fabricated by hot-pressing. For the inner layer, a Si3 N4 –polymer fiber made by extrusion was coated by dipping it into a 20 wt% BN-containing slurry. The three-layered composite exhibited excellent mechanical properties, including high strength, work of fracture, and crack resistance, because of the combination of a strong outer layer and a tough inner layer. In other words, the strong outer layer withheld the applied stress, while the tough inner layer promoted crack interactions through the weak BN cell boundaries. Also, the residual thermal stress on the surface due to the anisotropy in the coefficient of thermal expansion of BN affected a median/radial crack generation after indentation. 相似文献
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Silicon Nitride and Related Materials 总被引:22,自引:0,他引:22
Frank L. Riley 《Journal of the American Ceramic Society》2000,83(2):245-265
Silicon nitride has been researched intensively, largely in response to the challenge to develop internal combustion engines with hot-zone components made entirely from ceramics. The ceramic engine programs have had only partial success, but this research effort has succeeded in generating a degree of understanding of silicon nitride and of its processing and properties, which in many respects is more advanced than of more widely used technical ceramics. This review examines from the historical standpoint the development of silicon nitride and of its processing into a range of high-grade ceramic materials. The development of understanding of microstructure–property relationships in the silicon nitride materials is also surveyed. Because silicon nitride has close relationships with the SiAlON group of materials, it is impossible to discuss the one without some reference to the other, and a brief mention of the development of the SiAlONs is included for completeness. 相似文献
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Fabrication of Low-Shrinkage, Porous Silicon Nitride Ceramics by Addition of a Small Amount of Carbon 总被引:4,自引:0,他引:4
Jian-Feng Yang Guo-Jun Zhang Tatsuki Ohji 《Journal of the American Ceramic Society》2001,84(7):1639-1641
Successful net-shape sintering offers a significant advantage for producing large or complicated products. Porous Si3 N4 ceramics with very low shrinkage were developed, in the present investigation, by the addition of a small amount of carbon. Carbon powders (1–5 vol%) of two types, with different mean particle sizes (13 nm and 5 μm), were added to α-Si3 N4 −5 wt% Y2 O3 powders. SiC nanoparticles formed through reaction of the added carbon with SiO2 on the Si3 N4 surface or with the Si3 N4 particles themselves. Such reaction-formed SiC nanoparticles apparently had an effective reinforcing effect, as in nanocomposites. Sintered Si3 N4 porous ceramics with a high porosity of 50%–60%, a very small linear shrinkage of ∼2%–3%, and a strength of ∼100 MPa were obtained. 相似文献
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The reactivity of AlN powder with water in supernatants obtained from centrifuged Si3 N4 and SiC slurries was studied by monitoring the pH versus time. Various Si3 N4 and SiC powders were used, which were fabricated by different production routes and had surfaces oxidized to different degrees. The reactivity of the AlN powder in the supernatants was found to depend strongly on the concentration of dissolved silica in these slurries relative to the surface area of the AlN powder in the slurry. The hydrolysis of AlN did not occur if the concentration of dissolved silica, with respect to the AlN powder surface, was high enough (1 mg SiO2 /(m2 AlN powder)) to form a layer of aluminosilicates on the AlN powder surface. This assumption was verified by measuring the pH of more concentrated (31 vol%) Si3 N4 and SiC suspensions also including 5 wt% of AlN powder (with respect to the solids). 相似文献