Synthesis of Rod-like NiO–Co3O4 Composites for Sensitive Electrochemical Detection of Hydrogen Peroxide
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A NiO-Rh2P heterostructure electrocatalyst was constructed by phosphating the NiO-Rh structure. Due to the high capability of water dissociation by NiO, only 46 mV overpotential was demanded to achieve 10 mA cm−2 for the NiO-Rh2P, which is 73 mV lower than Rh2P in alkaline HER catalysis. Besides, the strong electronic interplay between NiO and Rh2P also contributed to the robust stability of NiO-Rh2P heterostructure electrocatalyst.
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我们准备了硅石， SiO2 涂的 NiO 和 NiO 由大音阶的第五音胶化的涂的 SiO2 方法。需要的材料的物理化学的性质被表面充电性质调查，扫描电子显微镜学(SEM ) ，精力散 X 光检查(EDX ) 光谱学，表面区域大小和 X 光检查衍射(XRD ) 分析。固体的零费用(PZC ) 的点被盐增加方法决定。在涂的材料，二 PZC 价值被注意代表他们的对应物的表面费用。， SiO2 涂的 NiO 的 SEM 图象在 NiO 涂的 SiO2 的情况下在 NiO 的表面上显示硅石的一致涂层，象外观一样的一个蜂房与高度多孔的结构被观察。在 NiO 的 diffractograms，然而，典型山峰在 NiO 涂的硅石被压制没有衍射山峰能在 SiO2 涂的 NiO 被看见。批吸附技术被申请从水的答案的 Pb2+ 离子的移动。为 Pb2+ 离子的吸着趋势在 NiO 涂的 SiO2 的顺序被观察 > SiO2 涂的 NiO > NiO > SiO2。这个趋势证实涂的材料比他们的父母对应物有更多的吸着能力。
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Electrocatalysis as a catalytic process involving oxidation or reduction through the direct transfer of electrons is of key importance subject in various fields of chemistry and associated sciences. Heterogeneous electrocatalysis is especially important to the development of water oxidation and fuel cells catalysts. This paper presents the brief description of the electrocatalysis and the mechanism of electrochemical reactions. Different factors and their influence on electrocatalytic activity, have been discussed. Role of nanoparticles in electrocatalysis received a particular emphasis. Long-term tasks of electrocatalysis were also definied.
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Metal-organic framework (MOF) based composite materials have attracted significant research interest in the electrocatalytic field. In this study, a carbonized polypyrrole coated MOF composite electrocatalyst ([email protected]) is developed, which is a nitrogen-modified MOF-based carbon used as non-precious oxygen reduction reaction (ORR) electrocatalyst. Physical characterizations prove that the [email protected] electrocatalyst has high nitrogen doping (2.53 at.%) and effective graphite and pyridinium nitrogen doping (86.6%). When compared with commercial Pt/C, as-obtained [email protected] electrocatalyst shows good ORR performance (∆E1/2 = −22 mV) with good stability (87.8%) and methanol tolerance. All results indicate that MOF-based [email protected] electrocatalyst is an effective and promising electrocatalyst for ORR.
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La 0.6 Ca 0.4 CoO 3 perovskite electrocatalyst had been synthesized by organic acid-aided method. The impact of the cal-cining conditions on the electrocatalyst preparation was studied by XRD, TEM and optimal results were given. The perfor-mance of bifunctional oxygen electrode electrocatalyst was evaluated preliminarily by galvanostatic polarization curve method. The results show that the electrocatalyst synthesized at 700 ℃for 2h has the characteristics of single phase, single crystal and smaller grain size, so the condition is optimal for preparing the electrocatalyst. The electrocatalyst made under that condition has better bifunctional oxygen electrode electrocatalytic activity and stability, which is promising as bifunctional oxygen elec-trode electrocatalyst for the MH-Air secondary battery application.
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采用水热法，制得了管径约为10~15 nm、管长约为10~300 nm、管壁上附着NiO纳米颗粒的TiO2纳米管复合光催化剂（NiO/TiO2）.采用X射线衍射、透射电子显微镜、扫描电镜、X射线光电子能谱及紫外-可见漫反射光谱等技术对催化剂进行了表征；以甲基橙为模拟污染物，评价了纳米管的光催化活性.结果表明：NiO晶粒与TiO2晶粒结合形成p-n异质结，有效地促进了光生电子和空穴的分离；NiO对可见光有强烈的吸收，使复合TiO2纳米管在整个可见光区域均有很好的光吸收；以上两点使NiO/TiO2纳米管可见光下的光催化活性大幅提升，500℃煅烧后纳米管对甲基橙1 h分解比由纯TiO2纳米管的7.0%提升至NiO/TiO2纳米管的95.6%.
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