CHEMICAL PHYSICS
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2020
·
IF 1.771
M. Khizar Shafique,Tahir Muhmood,S. Lin,Z. Cai,J. Xiao,H. Xiaobin
Single-crystal nickel micro-particles have been synthesized using oleylamine which perform both functions, as solvent and as reductant, along with nickel nitrate hexahydrate as the metallic salt and C-TAB as a surfactant. SEM imaging and X-ray techniques were used to confirm the presence of the single-crystal structure of nickel micro-particles. The effect of crystallinity on field-based and especially temperature based magnetic properties resulting in higher curie temperatures of nickel micro-particles was also analyzed. Their morphology and magnetic properties were compared with commercially obtained nickel micro-particles and a variety of other nickel microparticles prepared by using different surfactants in the same system.
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Journal of Materials Chemistry A
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2020
·Vol. 8
·期 18
·9049-9057
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IF 11.301
Qifeng Yang,Peng Jin,Bing Liu,Liang Zhao,Jiahao Cai,Zhan Wei,Shouwei Zuo,Jing Zhang,Lai Feng
Encapsulating metallic nanoparticles (NPs) with a graphitic carbon shell is a promising strategy to achieve highly efficient and stable electrocatalysts for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and electrochemical overall water splitting (OWS). This work presents a simple and facile synthesis of graphitic carbon coated NixRuy alloys. The optimized catalyst (e-Ni0.6Ru0.4@C) displays an ultrafine morphology and outstanding HER and OER activities in alkaline media, which are among the best reported so far for various carbon-based electrocatalysts. Remarkably, the e-Ni0.6Ru0.4@C‖e-Ni0.6Ru0.4@C pair needs a low cell voltage of 1.51/1.62 V for driving OWS to reach 10/100 mA cm−2, far outperforming the benchmark electrode pair Pt/C‖RuO2. As expected, this carbon-based catalyst also exhibits superior durability as compared to that of precious catalysts. The experimental evidence combined with density functional theory (DFT) computations thus demonstrates for the first time that minor Ru alloying enables not only the morphological modulation but also the fine electronic modification of the catalyst, which both facilitate the overall electrochemical reactions on the carbon shell surface. Thus, our results may further shed light on how to design and optimize carbon-based electrocatalysts to achieve enhanced catalytic performance for OWS.
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Nanoscale
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2020
·Vol. 12
·期 16
·8711-8719
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IF 6.895
Weilin Zheng,Qun Wan,Qinggang Zhang,Mingming Liu,Congyang Zhang,Bo Wang,Long Kong,Liang Li
Nickel oxides exhibit a great potential as hole transport layers for the fabrication of efficient perovskite light-emitting diodes (LEDs) due to their high carrier mobility and good energy band matching with perovskite nanocrystals. In this work, nickel oxides were directly decorated on the CsPbBr3 nanocrystal surface through adsorption and a sequential oxidation treatment. The resulting sample shows a high photoluminescence quantum-yield of 82%. The LED using CsPbBr3 nanocrystals with nickel oxides achieves a high external quantum efficiency (EQE) of up to 16.8% with a low turn-on voltage of 2.8 V, which is much superior to that of the counterpart LED based on pristine CsPbBr3 nanocrystals (EQE = 0.7%, turn-on voltage = 5.6 V). The excellent performance of the nickel oxide decorated CsPbBr3 nanocrystal device could be attributed to the better energy level matching between the decorated nanocrystals and the transport layers of the device and more balanced charge carrier injection. Furthermore, the operational lifetime of the nickel oxide decorated CsPbBr3 nanocrystal device is 40 times longer than that of the pristine CsPbBr3 nanocrystal device.
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Nanoscale
·
2020
·Vol. 12
·期 19
·10834-10841
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IF 6.895
Yong Li,Desheng Pan,Yangtao Zhou,Qifeng Kuang,Chinwei Wang,Bing Li,Bingsen Zhang,Jihoon Park,Da Li,Chuljin Choi,Zhidong Zhang
ε-Iron nitrides with the general formula ε-Fe3N1+x (−0.40 < x < 0.48) have been widely studied due to their interesting magnetism. However, the phase diagram of the Fe–N binary system indicates the absence of monophasic ε-Fe3N1+x (x < 0) compounds that are stable below their synthetic temperatures. Here, ε-Fe3N1+x (−0.12 ≤ x ≤ −0.01) nanoparticles with excellent thermal stability and magnetic properties were synthesized by a simple chemical solution method. The ε-Fe3N1+x nanoparticles with space group P6322 have excellent oxidation resistance due to a carbon shell with a thickness of 2–3 nm. NPD refinements suggest that the ε-Fe3N1+x nanoparticles possess a highly ordered arrangement of N atoms and their magnetic moments align parallel to the c axis. The Curie temperature (TC) and room temperature saturation magnetization (MS) increase with decreasing N content, which results in record-high TC (632 K) and MS (169.2 emu g−1) at x = −0.12, much higher than the magnetic properties of the corresponding bulk materials. The significant enhancements in the intrinsic magnetic properties and thermal stability of ε-Fe3N1+x are ascribed to chemically engineering the stoichiometry and N occupancy from the disordered to the ordered site.
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Nature Communications
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2020
·Vol. 11
·期 1
·1-8
·
IF 12.121
Li Siqi,Lei Dangyuan,Ren Wei,Guo Xuyun,Wu Shengfan,Zhu Ye,Rogach Andrey L.,Chhowalla Manish,Jen Alex K.-Y.
Owing to their large absorption cross-sections and high photoluminescence quantum yields, lead halide perovskite quantum dots (PQDs) are regarded as a promising candidate for various optoelectronics applications. However, easy degradation of PQDs in water and in a humid environment is a critical hindrance for applications. Here we develop a Pb-S bonding approach to synthesize water-resistant perovskite@silica nanodots keeping their emission in water for over six weeks. A two-photon whispering-gallery mode laser device made of these ultra-stable nanodots retain 80% of its initial emission quantum yield when immersed in water for 13 h, and a two-photon random laser based on the perovskite@silica nanodots powder could still operate after the nanodots were dispersed in water for up to 15 days. Our synthetic approach opens up an entirely new avenue for utilizing PQDs in aqueous environment, which will significantly broaden their applications not only in optoelectronics but also in bioimaging and biosensing.
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Journal of Materials Chemistry B
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2020
·Vol. 8
·期 32
·7213-7224
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IF 5.344
Xiao-Pei Li,Kai-Yun Qu,Feng Zhang,Han-Ning Jiang,Ning Zhang,Cheraga Nihad,Chao-Ming Liu,Kai-Hong Wu,Xiao-Wei Wang,Ning-Ping Huang
The field of cardiac tissue engineering has made significant strides in therapeutic and pharmaceutical applications, highlighted by the development of smart biomaterials. Scaffolds with appropriate properties mimicking the nature of a heart matrix will be highly beneficial for cardiac tissue engineering. In this study, high-aspect-ratio water-dispersed gold nanowires (AuNWs) were synthesized and incorporated into gelatin methacrylate (GelMA) hydrogels, demonstrating enhanced electrical conductivity and mechanical properties of the biomaterial scaffolds. Cardiac cells cultured on GelMA–AuNW hybrid hydrogels exhibited better biological activities such as cell viability and maturation state compared to those cultured on GelMA hydrogels. Moreover, cardiomyocytes showed synchronous beating activity and a faster spontaneous beating rate on GelMA–AuNW hybrid hydrogels. Our strategy of integrating high-aspect-ratio water-dispersed gold nanowires within gelatin methacrylate hydrogels provides a favorable biomaterial scaffold to construct functional cardiac tissue for further applications in cardiac tissue engineering and drug screening.
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SOLAR ENERGY
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2020
·
IF 4.608
Fan Sui,Mingyue Pan,Zhengyan Wang,Ming Chen,Wenjie Li,Yan Shao,Weimin Li,Chunlei Yang
The emission and absorption properties of Mn doped CsPbCl 3 NC make it ideal candidates as luminescent down shifting layer material for solar cells, However, effective Mn doping and further quantum yield improvement remains challenging. We present our modified hot injection route to obtain Mn doped CsPbCl 3 nanocrystals with different morphologies and enhanced quantum yield. The samples presented were synthesized with precursor MnCl 2 and PbCl 2 with the ratio of 1:1, 1:2, 1:2.5 and 1:3. For samples with lower Mn doping level, the as prepared samples are uniform nanocubes with average size of 11 nm. When MnCl 2 amount is increased beyond 2.5, large piece of nanosheets were found by TEM and AFM with ultrathin thickness and strong quantum confinement effect. CsPbCl 3 nanocrystals with optimal Mn doping level show enhanced quantum yield of 69%. Luminescent down shifting layers prepared from Mn doped CsPbCl 3 nanocrystals successfully increased short-circuit current (6.67%) and PCE (1.67%) of Cu(In,Ga)Se 2 solar cell.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Fengxia Wu,Kamel Eid,Aboubakr M. Abdullah,Wenxin Niu,Chao Wang,Yixiang Lan,Ahmed A. Elzatahry,Guobao Xu
Multidimensional bimetallic Pt-based nanoarchitectonics are highly promising in electrochemical energy conversion technologies because of their fancy structural merits and accessible active sites; however, hitherto their precise template-free fabrication remains a great challenge. We report a template-free solvothermal one-pot approach for the rational design of cocentric PtNi multicube nanoarchitectonics via adjusting the oleylamine/oleic acid ratio with curcumin. The obtained multidimensional PtNi multicubes comprise multiple small interlace-stacked nanocube subunits assembled in spatially porous branched nanoarchitectonics and bound by high-index facets. The synthetic mechanism is driven by spontaneous isolation among prompt nucleation and oriented attachment epitaxial growth. These inimitable architectural and compositional merits of PtNi multicubes endowed the ethanol oxidation mass and specific activity by 5.6 and 9.03 times than the Pt/C catalyst, respectively, along with the enhancement of methanol oxidation mass activity by 2.3 times. Moreover, PtNi multicubes showed superior durability and a higher tolerance for CO poisoning than the Pt/C catalyst. This work may pave the way for tailored preparation of Pt-based nanoarchitectonics for myriad catalytic reactions.
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Nanoscale
·
2020
·Vol. 12
·期 25
·13688-13696
·
IF 6.895
Ping Li,Cheng Du,Xiaohui Gao,Zhihua Zhuang,Dong Xiang,Chunmei Zhang,Wei Chen
Morphology modulation and surface structure-controlled synthesis are two effective ways to tune the electrocatalytic activities of metal nanomaterials. Pt-based binary or ternary metal nanostructures have become a class of promising catalysts toward the oxygen reduction reaction (ORR) and the methanol oxidation reaction (MOR) for direct methanol fuel cells. Herein to reveal the morphology and surface structure effects of one-dimensional (1D) Pt-based nanostructures on their electrocatalytic properties, two types of 1D CuPt nanowires (CuPt NWs) and CuPt nanotubes (CuPt NTs) with tunable surface structures and compositions were fabricated using a convenient and easy strategy. It was found that among all the studied samples, CuPt2.22 NWs exhibited the highest efficiency catalytic performances for both the ORR and MOR in an acidic electrolyte. For the ORR, CuPt2.22 NWs exhibited an onset potential (Eonset) of 0.749 V and a half-wave potential (E1/2) of 0.577 V, which are more positive than those of the commercial Pt/C (0.668 V and 0.558 V). On the other hand, CuPt2.22 NWs show a specific activity of 20.76 mA cm−2 and a mass activity of 0.171 mA μgPt−1 for the MOR, which are 7.75 and 1.82 times, respectively, larger than those of Pt/C (2.679 mA cm−2 and 0.094 mA μgPt−1). Meanwhile, the reaction mechanism of the MOR on CuPt2.22 NWs was examined by in situ FTIR. From the enhanced IR absorption, the linear- and bridge-adsorbed CO intermediates can be determined during the methanol oxidation on CuPt2.22 NWs, from which the MOR proceeds through a dual reaction pathway. This work reveals that rationally tuning the electronic structures of 1D metal nanomaterials by well-controlling the composition and surface morphology on the nanoscale could greatly enhance the catalytic properties, which are very important for their application in fuel cells.
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Nanoscale
·
2020
·Vol. 12
·期 22
·12098-12105
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IF 6.895
Fei Gao,Yangping Zhang,Fangfang Ren,Tongxin Song,Yukou Du
One-dimensional (1D) Pt-based nanowires (NWs) materials serve as efficient catalysts for alcohol electrocatalysis. However, precisely tailoring their size towards sub-one-nanometer scale has been verified as an effective method for enhancing electrocatalytic properties, which is rarely studied. In this work, we developed a one-pot simple yet efficient method for synthesizing a kind of sub-one-nanometer tiny Ir-doped PtMn NWs. The prepared PtMnIr NWs have an ultrathin structure with a mean diameter of around only 0.97 nm (about 3–5 atomic thickness), which display large surface areas and promote superficial Pt atom utilization. With the robust tiny Ir incorporation, the composition-optimized Pt74Mn21Ir5 NWs showed enhanced mass activity, which was 1.51 and 1.53 times higher than those of non-Ir-doped Pt79Mn21 NWs for acidic ethanol oxidation reaction (EOR) and methanol oxidation reaction (MOR). Moreover, benefiting from the atom-level ultrathin size and well-tuned ligand effect from Ir to PtMn, the EOR/MOR mass activities of sub-nanometric Pt74Mn21Ir5 NWs were 3.99- and 3.98-fold higher than those of Pt/C catalysts. More importantly, after successive EOR and MOR CV tests, the Ir-doped PtMn NWs still maintained 85.6% and 73.4% of the initial mass activity, which were much better than those of Pt79Mn21 NWs, Pt NWs, and Pt/C catalysts. This work could be extended to engineering other advanced materials with super sub-one-nanometer structure, which is beneficial for largely improving the catalytic performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Shan Yu,Zhanghui Xie,Maoxia Ran,Fan Wu,Yunqian Zhong,Meng Dan,Ying Zhou
Through direct addition of inorganic zinc ions into the solution of indium phosphide quantum dots (InP QDs) at ambient environment, we here present a facile but effective method to modify InP QDs for photocatalytic hydrogen evolution from hydrogen sulfide (H 2 S). X-ray diffraction patterns and transmission electron microscopic images demonstrate that zinc ions have no significant influence on the crystal structure and morphology of InP QDs, while X-ray photoemission spectra and UV–Vis diffuse and reflectance spectra indicate that zinc ions mainly adsorbed on the surface of InP QDs. Photocatalytic results show the average hydrogen evolution rate has been enhanced to 2.9 times after modification and H 2 S has indeed involves in the hydrogen evolution process. Steady-state and transient photoluminescence spectra prove that zinc ions could effectively eliminate the surface traps on InP QDs, which is crucial to suppress the recombination of charge carriers. In addition, the electrostatic interaction between zinc ions and the surface sulfide from InP QDs could mitigate the repulsion between QDs and sulfide/hydrosulfide, which may promote the surface oxidative reaction during photocatalysis. This work avoids the traditional harsh and complicated operations required for surface passivation of QDs, which offers a convenient way for optimization of QDs in photocatalysis.
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RSC Advances
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2020
·Vol. 10
·期 21
·12689-12694
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IF 3.119
Na Gao,Xingqiao Wu,Xiao Li,Jingbo Huang,Dongsheng Li,Deren Yang,Hui Zhang
Developing an efficient Pt-based multimetallic electrocatalyst with well-defined shapes for methanol oxidation reaction (MOR) is critical, however, it still remains challenging. Here we report a one-pot approach for the synthesis of ternary PtPdCu alloy hexapods with different compositions. Their MOR activities increased in the sequence Pt2PdCu4 < Pt3PdCu4 < Pt5PdCu5, and were substantially higher than that of commercial Pt/C. Specifically, the Pt5PdCu5 hexapods exhibited the highest mass (0.97 mA μgPt−1) and specific (7.39 mA cm−2) activities towards MOR, and were 5.4 and 19.4 times higher than those of commercial Pt/C (0.18 mA μgPt−1 and 0.38 mA cm−2), respectively. This enhancement could be probably attributed to the bifunctional mechanism and ligand effect through the addition of Cu and Pd as well as the unique dendritic structure. The better tolerance for CO poisoning also endowed the PtPdCu hexapods with superior durability relative to commercial Pt/C.
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