全文获取类型
| 收费全文 | 128篇 |
| 免费 | 10篇 |
| 国内免费 | 27篇 |
专业分类
| 化学 | 124篇 |
| 晶体学 | 12篇 |
| 物理学 | 29篇 |
出版年
| 2025年 | 1篇 |
| 2024年 | 3篇 |
| 2023年 | 2篇 |
| 2022年 | 4篇 |
| 2021年 | 8篇 |
| 2020年 | 12篇 |
| 2019年 | 18篇 |
| 2018年 | 8篇 |
| 2017年 | 5篇 |
| 2016年 | 4篇 |
| 2015年 | 5篇 |
| 2014年 | 5篇 |
| 2013年 | 10篇 |
| 2012年 | 5篇 |
| 2011年 | 6篇 |
| 2010年 | 11篇 |
| 2009年 | 7篇 |
| 2008年 | 9篇 |
| 2007年 | 8篇 |
| 2006年 | 3篇 |
| 2005年 | 1篇 |
| 2004年 | 4篇 |
| 2003年 | 4篇 |
| 2002年 | 5篇 |
| 2000年 | 2篇 |
| 1999年 | 4篇 |
| 1998年 | 2篇 |
| 1996年 | 3篇 |
| 1995年 | 2篇 |
| 1993年 | 1篇 |
| 1992年 | 1篇 |
| 1990年 | 1篇 |
| 1983年 | 1篇 |
排序方式： 共有165条查询结果，搜索用时 15 毫秒
1.
Rui‐Ting Gao Dan He Lijun Wu Kan Hu Xianhu Liu Yiguo Su Lei Wang 《Angewandte Chemie (International ed. in English)》2020,59(15):6213-6218
Increasing long‐term photostability of BiVO4 photoelectrode is an important issue for solar water splitting. The NiOOH oxygen evolution catalyst (OEC) has fast water oxidation kinetics compared to the FeOOH OEC. However, it generally shows a lower photoresponse and poor stability because of the more substantial interface recombination at the NiOOH/BiVO4 junction. Herein, we utilize a plasma etching approach to reduce both interface/surface recombination at NiOOH/BiVO4 and NiOOH/electrolyte junctions. Further, adding Fe2+ into the borate buffer electrolyte alleviates the active but unstable character of etched‐NiOOH/BiVO4, leading to an outstanding oxygen evolution over 200 h. The improved charge transfer and photostability can be attributed to the active defects and a mixture of NiOOH/NiO/Ni in OEC induced by plasma etching. Metallic Ni acts as the ion source for the in situ generation of the NiFe OEC over long‐term durability. 相似文献
2.
3.
4.
太阳能驱动的光电化学(PEC)水分解可以有效地将太阳能转化为化学能,作为解决环境排放和能源危机最具前景的途径之一,已经引起了科学界的广泛关注.PEC水分解系统由两个半反应组成:在光阳极上的析氧反应(OER)和光阴极上的析氢反应(HER).PEC系统的太阳能转化效率主要由光阳极/电解质界面的OER过程所决定,这是一个非常复杂且涉及质子偶联的多步四电子转移过程.钒酸铋(BiVO4)是应用于PEC水分解的典型且具有实际应用前景的光阳极材料之一.然而,由于不良的表面电荷转移、电荷在光阳极/电解质结面处的表面复合以及缓慢的OER动力学等因素,导致BiVO4的PEC性能受到严重限制.本文开发了一种新颖有效的解决方案,以低成本、高电导率和具有快速电荷转移能力的硫化钴装饰来提升BiVO4光阳极的PEC活性,X射线多晶衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等表征,研究结果表明CoS成功装饰于BiVO4表面.采用紫外-可见吸收光谱(UV-VisDRS)研究了BiVO4和复合光阳极CoS/BiVO4的光学性质,结果表明,与纯的BiVO4相比,CoS/BiVO4光阳极在可见光范围内光吸收能力有所增强.将制备的BiVO4和CoS/BiVO4光阳极应用于PEC分解水实验中,结果表明,相对于1.23 V可逆氢电极,在光照下,CoS/BiVO4光阳极的光电流密度显著提升,可高达3.2 m Acm-2,是纯BiVO4的2.5倍以上.与纯BiVO4相比,CoS/BiVO4光阳极的起始氧化电位显示出负向偏移0.2 V,表明析氧过电势得到有效减小.入射光子转换效率(IPCE)测试结果表明,CoS/BiVO4光阳极的入射光子转换效率在500 nm之前的可见光范围内得到明显提升,其中,CoS/BiVO4的IPCE值在380 nm处达到最大.此外,由于CoS的装饰作用,CoS/BiVO4光阳极的电荷注入效率和电荷分离效率均得到较大的提升,分别达到75.8%(相较于纯BiVO4光阳极的36.7%)和79.8%(相较于纯BiVO4光阳极的66.8%).电化学阻抗谱(EIS)测试结果表明,通过CoS的装饰,CoS/BiVO4光阳极的界面电荷转移电阻得到有效降低,证明其界面电荷转移动力学得到有效提升.光致发光光谱测试结果表明,CoS的装饰显著提高了BiVO4的光生电子-空穴对的分离效率,进一步证明BiVO4表面的CoS装饰在其PEC分解水中起着非常积极的作用.本文为通过表面修饰设计应用于PEC水分解的有效的光阳极提供了新思路. 相似文献
5.
The aqueous synthesis and electrochemical properties of nanocrystalline MxV2O5Ay·nH2O are described. It is easily and quickly prepared by precipitation from acidified vanadate solutions. MxV2O5Ay·nH2O has been characterized by X-ray powder diffraction, electron microscopy, TGA, chemical analyses, and electrochemical studies. The atomic structure is related to that of xerogel-derived V2O5·nH2O. In MxV2O5Ay·nH2O, M is a cation from the starting vanadate salt and A is an anion from the mineral acid. This material exhibits high, reversible Li capacity and may be considered for use in a cathode in primary and secondary batteries. The lithium capacity of an electrode composed of MxV2O5Ay·nH2O/EPDM/carbon (88/4/8) is ∼380(mA h)/g (C/80 rate) and the energy density is ∼1000(W h)/kg (120-μm-thick cathode, 4-1.5 V, versus Li metal anode). Critical parameters identified in the synthesis of MxV2O5Ay·nH2O, with respect to achieving high Li-ion insertion capacity, are acid/vanadium ratio, starting vanadate salt, and temperature. Inclusion of carbon black in the synthesis yields a composite that maintains the high Li capacity, lowers the electrochemical-cell polarization, and preserves the lithium capacity at higher discharge rates. Li-ion coin cells, using pre-lithiated graphite anodes, exhibit electrochemical performance comparable to that of Li-metal coin cells. 相似文献
6.
Cu vanadate nanorods have been synthesized via the hydrothermal process using polymer polyvinyl pyrrolidone (PVP) as the surfactant. X‐ray diffraction (XRD) shows that the nanorods are composed of monoclinic Cu5V2O10 phase. Scanning electron microscopy (SEM) observation shows that the diameter and length of the nanorods are 50–300 nm and 3 μm, respectively. PVP concentration, hydrothermal temperature and duration time play essential roles in the formation and sizes of the Cu vanadate nanorods. A PVP‐assisted nucleation and crystal‐growth process is proposed to explain the formation of the Cu vanadate nanorods. Gentian violet (GV) is used to evaluate the photocatalytic activities of the Cu vanadate nanorods under solar light. The GV concentration clearly decreases with increasing irradiation time, and content of the Cu vanadate nanorods. GV solution with the concentration of 10 mg L−1 can be totally degraded under solar light irradiation for 4 h using 10 mg Cu vanadate nanorods. The Cu vanadate nanorods have good photocatalytic activities for the degradation of GV under solar light. 相似文献
7.
Monodisperse semiconductor sphere holds great potential for a wide variety of application as a basic building block. Herein a binary oxide, BiVO4, with highly uniform monodisperse nanosphere of 125 nm diameter was primarily synthesized via a hybrid method with PVP assisted in organic solvent. After investigating the function of PVP and the emergence of esterification in solvent, we proposed a formation mechanism of amorphous BiVO4 nanosphere, including the precipitation of BiVO4 clusters in reverse micelles and the self-assembly aggregation of BiVO4 clusters to be BiVO4 nanospheres. The generated water in esterification provides a nanoreactor to precipitate BiVO4 cluster, in return, the precipitation by using water catalyzes the process of esterification in ethanol with acetic acid. This hybrid reaction of inorganic BiVO4 precipitate and organic esterification opens a novel avenue to couple nano inorganic chemistry with organic dehydration synthesis, achieving green chemistry for sustainable development. Furthermore, highly efficient nanoporous BiVO4 photoanodes composed of BiVO4 nanospheres for water splitting were obtained using a simple drop-casting method and optimized for their photocurrent density by calcination temperatures. This hybrid reaction strategy could be applied to synthesize other semiconductors with nanosphere toward novel low-cost structures and devices. 相似文献
8.
Takahiro Murakami Kosuke Ikezoi Prof. Keiji Nagai Prof. Hideki Kato Prof. Toshiyuki Abe 《ChemElectroChem》2020,7(24):5029-5035
In the water-splitting reaction, the oxidation of water to O2 is considered to be a kinetically demanding process, so that a co-catalyst has been usually applied to promote water oxidation. This work demonstrates that, when loading mixed-valence cobalt (II,III) oxide (Co3O4) dispersed in a Nafion membrane (Nf) on a nanoporous bismuth vanadate (BiVO4) photoanode (i. e., BiVO4/Nf[Co3O4]), stable and efficient water oxidation occurred. In particular, it is noteworthy that the BiVO4/Nf[Co3O4] photoanode exhibited stable performance even in an acidic medium (pH=2). In the present system consisting of a BiVO4/Nf[Co3O4] photoanode along with an organo-photocathode, the stoichiometric formation of O2 and H2 successfully occurred by applying just 0.1 V between the photoelectrodes (cf. maximum efficiency, ca. 0.2 %), which was superior to the prototype comprising BiVO4 and Pt counter electrode. The Co3O4 loading can effectively suppress the collapse of the nanostructured BiVO4 upon photocorrosion, resulting in the stable and kinetically efficient consumption of holes in BiVO4. 相似文献
9.
David J. Chadderdon Li-Pin Wu Zachary A. McGraw Prof. Dr. Matthew Panthani Prof. Dr. Wenzhen Li 《ChemElectroChem》2019,6(13):3387-3392
Motivated by replacing the kinetically unfavorable oxygen evolution reaction (OER) and producing value-added products in photoelectrochemical cells (PECs), we report that bismuth vanadate (BiVO4) photoelectrodes modified with a cobalt phosphate (CoPi) overlayer facilitate 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated selective oxidation of 5-hydroxymethylfurfural (HMF). CoPi layers with sufficient thickness were found to reduce the potential required for TEMPO oxidation by 0.5 V, as well as increase charge injection efficiency sevenfold compared to BiVO4 without CoPi. Furthermore, the undesired OER was completely suppressed when using the heterostructured photoanodes. Transient photocurrent measurements suggested that CoPi alleviates recombination losses resulting from the back reduction of oxidized TEMPO. The PECs with BiVO4/CoPi bilayer achieved 88 % yield to 2,5-furandicarboxylic acid (FDCA) from HMF oxidation under mild conditions, whereas <1 % FDCA was generated with BiVO4. These findings suggest that suppression of the back reduction process substantially improves the efficiency of the oxidation, giving a potential route to more efficient solar fuel/chemical production. 相似文献
10.
Hiba Saada Dr. Rawa Abdallah Dr. Bruno Fabre Dr. Didier Floner Stéphanie Fryars Dr. Antoine Vacher Dr. Vincent Dorcet Cristelle Meriadec Dr. Soraya Ababou-Girard Dr. Gabriel Loget 《ChemElectroChem》2019,6(3):613-617
BiVO4 is a promising n-type semiconductor for water-splitting photoelectrochemical cells. We report here a new method to prepare BiVO4 photoanodes that is based on an alkaline electrodeposition process, which avoids chemical etching of Bi. In addition, we present a simple and general method to prepare coatings of amorphous FeOx that behave as a co-catalyst on our BiVO4 material, improving the water splitting photocurrent. 相似文献