排序方式: 共有37条查询结果,搜索用时 218 毫秒
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利用改进型的溶胶-凝胶法, 制得了由锐钛矿相纳米颗粒组成的TiO2多孔微纳小球。通过调节前驱物浓度, 合成出粒径可控的尺寸分别为100, 175, 225, 475 nm的TiO2微纳小球, 并通过电泳沉积法将合成出的小球作为光散射层引入到染料敏化太阳电池(DSSC)中。由于这种微纳小球在具备良好的光散射性能的同时也具备较高的染料吸附量, 因此相较于基于纳米颗粒的单层结构的DSSC拥有更高的光电转换效率。通过比较分析, 粒径尺寸为475 nm的微球作为光散射层的DSSC光电转换效率可以达到6.3%, 较之于基于纳米颗粒的DSSC提高了30%。 相似文献
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利用改进型的溶胶-凝胶法,制得了由锐钛矿相纳米颗粒组成的TiO2多孔微纳小球。通过调节前驱物浓度,合成出粒径可控的尺寸分别为100,175,225,475 nm的TiO2微纳小球,并通过电泳沉积法将合成出的小球作为光散射层引入到染料敏化太阳电池(DSSC)中。由于这种微纳小球在具备良好的光散射性能的同时也具备较高的染料吸附量,因此相较于基于纳米颗粒的单层结构的DSSC拥有更高的光电转换效率。通过比较分析,粒径尺寸为475 nm的微球作为光散射层的DSSC光电转换效率可以达到6.3%,较之于基于纳米颗粒的DSSC提高了30%。 相似文献
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《中国化学快报》2021,32(8):2427-2432
Developing high-efficiency,inexpensive,and steady non-precious metal oxygen reduction reaction(ORR) catalysts to displace Pt-based catalysts is significant for commercial applications of Al-air battery.Here,we have prepared the Cu/Cu_2 O-NC catalyst with excellent ORR performance and high stability,due to the synergistic effect of Cu and Cu_2 O nanoparticles.The half-wave potential(0.8 V) and the limiting-current density(5.20 mA/cm~2) of the Cu/Cu_2 O-NC are very close to those of the 20% Pt/C catalyst(0.82 V,5.10 mA/cm~2).Besides,it exhibits excellent performance with a maximal power density of 250 mW/cm~2 and a stable continuous discharge for more than 90 h in the Al-air battery test The promoting effects of Cu_2 O towards Cu-based ORR catalysts are illustrated as follows:(ⅰ) Cu_2 O is the major ORR active site by the redox of Cu(Ⅱ)/Cu(Ⅰ),which provides excellent ORR activities;(ⅱ) Cu can stabilize the location of Cu_2 O by assisting the electron transfer to Cu(Ⅱ)/Cu(Ⅰ) redox,which is conducive to the high stability of the catalyst.This work provides a useful strategy for enhancing the ORR performance of Cu-based catalysts. 相似文献
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Long Liu Jia Hui Kou Da Meng Guo Jing Yang Hong Lin Liu Hong Xia Yu Sheng Chu Ke Ren Jiang Ying Wang Zhi Gang Zou 《中国化学快报》2009,20(11):1366-1370
In this paper,a thiol-functionalized nanophotocatalyst MPTES/TiO_2 was first synthesized by one-pot method using P123 as a template.X-ray diffraction confirms the complete anatase crystalline of thiol-functionalized TiO_2,N_2 adsorption-desorption isotherm demonstrated that these materials possess high surface area and mesoporous structure.The results of XPS show that MPTES has been successfully polymerized in mesoporous structured TiO_2.The photodegradation of phenanthrene(PHE) was investigated under vi... 相似文献
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以硫代乙酰胺为硫源, 通过一种较温和的溶剂热法先将生长于氟掺杂的SnO2 (FTO)导电玻璃上的ZnO纳米片硫化, 再将其在空气中高温焙烧氧化,利用ZnO/ZnS晶格的膨胀收缩效应使ZnO纳米片表面粗糙化,达到提高其比表面积的目的. 系统研究了该硫化氧化两步法中ZnO纳米片、硫化后的ZnS纳米片、硫化氧化后的ZnO纳米片薄膜的形貌、物相、比表面积及孔径分布的变化. 并将硫化氧化前后两种ZnO纳米片阵列薄膜制成染料敏化太阳电池的光电极, 分别对电池的电流密度-电压(J-V)特性进行了表征. 实验结果表明, 经过硫化氧化后的ZnO纳米片的比表面积大约是未经该处理的ZnO纳米片的2倍, 同时前者的太阳电池光电转换效率(IPCE)相对于后者提高33%. 相似文献
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A novel mesoporous SBA-15 type of hybrid material (3-trimethoxysilylpropyl)[4-(2-hydroxyphenyl)methylene] benzenesulfonamide (Schiff-SBA-15) has been obtained by co-condensation of tetraethyl orthosilicate and the organosilane, and the result of XRD confirms the order hexagonal structure of the composite. This hybrid mesoporous material is fluorescent-active, exhibiting high selectivity for sensing Cu2+ in polar solution. The remarkable fluorescence quenching in emission spectrum upon the addition of Cu2+ is attributed to the intramolecular charge transfer after the formation of a coordinate complex of a large conjugate system and Cu2+ ions. 相似文献
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Luo L Guo Y Yang J Liu Y Chu S Kong F Wang Y Zou Z 《Chemical communications (Cambridge, England)》2011,47(40):11243-11245
A visible light triggered protein delivery system has been assembled through hydroxyl coordinated onto titania nanoparticles. Biomolecules such as hemoglobin (Hb) can be controlled-released from the hybrid material TiO(2)-DB-Hb by switching visible light on/off. The released Hb not only retains its senior structure but also can fulfil the enzymatic bioactivity. Controlled delivery of Hb stems from the scission of the Ti-O coordination bond with the aid of photo-inducing electron transfer property of titania. 相似文献
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通过分步电沉积法制备碳布(CC)负载高致密Sn/SnBi合金催化剂:首先在CC上电沉积致密Sn颗粒,而后利用酸性电解液部分溶解Sn为Sn2+离子,实现在Sn颗粒表面共沉积SnBi合金枝晶,随后经过原位化学氧化及电化学还原步骤将SnBi合金枝晶转变为SnBi合金纳米颗粒(SnBi NPs)。得益于Sn提供形核位点,SnBi枝晶在碳织物表面垂直致密生长,并通过后续氧化还原转化实现了直径约20 nm的SnBi合金颗粒在CC上致密均匀生长。CC/Sn/SnBi NPs三维电极在-1.08 V (vs RHE)下显示出较高的电催化还原CO2活性,电流密度高达36 mA·cm-2且甲酸盐产物选择性为94.9%。同时,在连续12 h恒电压测试中性能未发生衰减,表明电极具有良好的稳定性。 相似文献