Journal of CO2 Utilization
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2021
·
IF 7.132
Xiaoyue Huang,Yan Hu,Liang Zhou,Juying Lei,Lingzhi Wang,Jinlong Zhang
As a greenhouse gas, CO 2 is also a rich carbon resource. Using sunlight to reduce CO 2 to usable substances through photocatalysis can alleviate the greenhouse effect and realize energy recycling. Herein, CuS nanoparticles are grown in situ on the surface of inverse opal g-C 3 N 4 by a one-step hydrothermal method. The inverse opal structure can increase the specific surface area of the material, and CuS can be used as the cocatalyst to accept photo-generated electrons on the conduction band of g-C 3 N 4 , thereby promoting the separation and transfer of photo-generated charges. And the interfacial charge transfer mechanism of CuS further improves the separation efficiency of photogenerated electrons and holes. The photocatalytic reduction of CO 2 activity of the prepared catalyst is greatly improved. The CO yield reaches 13.24 μmol g −1 h −1 . A new strategy is provided to develop artificial photosynthesis for reduction of CO 2 .
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MATERIALS CHEMISTRY AND PHYSICS
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2021
·
IF 4.094
Xianhao Min,Qifei Xie,Zhiguo Wang,Xinzhong Wang,Mingxiang Chen
As traditional capping ligands like oleic acid (OA) and oleylamine (OLA) cannot efficiently maintain the optoelectronic properties and stability of iodide perovskite nanocrystals (NCs), post synthesis surface modification with some other ligand is a convenient and valid method to solve these problems to some extent. Here we promote a long carbon chain ligand with a thiol group, 1-Octadecanethiol (ODT), to realize the passivation of the surface of CsPbI 3 NCs after the synthesis process. After modification, our ODT-CsPbI 3 NCs exhibit excellent optical properties with a high PLQY of 93% and outstanding stability under different conditions compared to the untreated samples.
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JOURNAL OF CHEMICAL PHYSICS
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2021
·Vol. 155
·期 23
·
IF 3.488
Cao Jianfei,Yin Zuodong,Pang Qi,Lu Yuexi,Nong Xiuqing,Zhang Jin Zhong
In this work, we demonstrated an in situ approach for doping CsPbBr 3 nanocrystals (NCs) with In 3+ and Cl − with a ligand-assisted precipitation method at room temperature. The In 3+ and Cl − co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet–visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In 3+ -doping induced localized impurity states is revealed. Furthermore, the impact of In 3+ and Cl − doping on charge transfer (CT) from the NCs to molecular acceptors was investigated and the results indicate that the CT at the interface of NCs can be tuned and promoted by In 3+ and Cl − co-doping. This enhanced CT is attributed to the enlarged energy difference between relevant states of the molecular acceptor and the NCs by In 3+ and Cl − upon co-doping. This work provides insight into how to control interfacial CT in perovskite NCs, which is important for optoelectronic applications.
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高影响因子
OPTICAL MATERIALS
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2021
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IF 3.08
Jiao Xun,Jidong Deng,Wei Shen,Ming Li,Rongxing He
Although organic-inorganic hybrid MAPbBr 3 (CH 3 NH 3 + = MA) perovskite nanocrystals (NCs) have outstanding optical properties , their toxicity and the low thermal stability seriously hinder the further application. Herein, the low-toxic MAPb 1- x Mn x Br 3 NCs were synthesized by the modified ligand-assisted re-precipitation (LARP) approach at room temperature. The mixed-metal NCs exhibit high PLQYs (more than 93%) due to a certain amount of Mn 2+ doping effectively inhibits the non-radiative recombination, and thus improves the optical performance. The as-synthesized perovskite NCs also show excellent thermal stability because of the elimination of structural distortion by Mn 2+ -doping. The fast anion exchange of Mn 2+ -doped perovskite NCs effectively extends their photoluminescence to the whole visible spectral region. Interestingly, a novel dual-emission was observed in MAPb 1- x Mn x (I/Br) 3 ( x = 0.3) perovskite NCs due to the phase separation.
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Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·301-311
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IF 7.393
Xiang Meng,Xihao Chen,Jiang Cheng,Fuqiang Zhai,Wen Li,Rui Hu,Lu Li
Hollow polycrystalline structures and noble-metal-coating endow ternary sulfides with promising light absorption and electrical properties for solar energy conversion applications. We developed a facile one-pot solvothermal chemical route to synthesize hollow Cu3SbS4 microspheres with an opening. Additionally, four phase-pure Cu–Sb–S high-quality nanocrystals can be produced in a selectable way by the same route. The detailed evolution process and self-driven breakage mechanism have been proposed in detail. Subsequently, in situ reduction of the Ag-ion precursor was conducted and Ag clusters were uniformly deposited in the hollow spherical architecture with a nanoparticle-textured surface and interior to mitigate the oxidization of Cu3SbS4 nanoparticles. The created hollow metal-semiconductor nanocomposite opens up a favorable new situation. The nanocomposites exhibited a remarkably enhanced absorption of over 2 × 105 cm−1, covering the UV and visible regions of the electromagnetic spectrum. The electrical resistivity decreased drastically by 90% after the coating of noble metals. A reduction in the bandgap energy after the addition of Ag to Cu3SbS4 was confirmed from extrapolated optical results and theoretical calculation validation. The synthetic effect of hollow structures and nanocomposites results in the superior performance of Cu–Sb–S compounds, thus highlighting their potential applications in light absorbers and energy conversion technologies.
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ADVANCED MATERIALS
·
2021
·Vol. 34
·期 6
·2108727
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IF 30.849
Zhijie Zhu,Kai Feng,Chaoran Li,Rui Tang,Mengqi Xiao,Rui Song,Di Yang,Binhang Yan,Le He
Colloidal metal nanocrystals with uniform sizes, shapes, compositions, and architectures are ideal building blocks for constructing heterogeneous catalysts with well-defined characteristics toward the investigation of accurate structure–property relationships and better understanding of catalytic mechanism. However, their applications in high-temperature heterogeneous catalysis are often restricted by the difficulty in maintaining the high metal dispersity and easy accessibility to active sites under harsh operating conditions. Here, a partial-oxide-coating strategy is proposed to stabilize metal nanocrystals against sintering and meanwhile enable an effective exposure of active sites. As a proof-of-concept, controlled partial silica coating of colloidally prepared Pd 0.82 Ni 0.18 nanocrystals with the size of 8 nm is demonstrated. This partially coated catalyst exhibits excellent activity, selectivity, and stability, outperforming its counterparts with fully coated and supported structures, in reverse water gas shift (RWGS) catalysis particularly at high operating temperatures. This study opens a new avenue for the exploration of colloidal metal nanocrystals in high-temperature heterogeneous catalysis.
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JOURNAL OF LUMINESCENCE
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2021
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IF 3.599
Yuhan Ma,Youchao Wei,Feilong Jiang,Yongsheng Liu,Maochun Hong
Photo upconversion that converts low-energy light into high-energy photons holds great promise for boosting the energy conversion efficiencies particularly for photovoltaic devices based on all-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite quantum dots . However, the realization of nonlinear upconversion luminescence (UCL) from these all-inorganic CsPbX 3 perovskites has been met with very limited success until now. Herein, we propose a rational perovskite/upconversion hetero-structured design strategy to achieve excitonic UCL of all-inorganic CsPbX 3 perovskites based on fluorescence resonance energy transfer (FRET), where all-inorganic CsPbX 3 perovskites and upconverting CaF 2 :Ln (Ln = Yb 3+ /Er 3+ , Yb 3+ /Ho 3+ , and Yb 3+ /Tm 3+ ) nanocrystals are closely integrated with each other as a whole by using a modified two-step epitaxial growth approach, forming the unique upconverting CsPbX 3 /CaF 2 :Ln hetero-structured nanocomposites (HSNCs). Benefitting from the extremely high FRET efficiency of ∼99.7%, excitonic UCL from CsPbX 3 perovskites can be realized upon low-power density 980-nm diode laser irradiation. More importantly, all the HSNCs are found to outperform their pure CsPbX 3 counterparts in terms of air-stability, thermal-stability, and excitonic downconversion luminescence intensity, clearly demonstrating the overwhelming advantages of upconverting HSNCs we prepared over the pure CsPbX 3 perovskites for high-performance optoelectronic and photovoltaic applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yanshan Mo,Shouquan Feng,Tianqi Yu,Jinli Chen,Guangfu Qian,Lin Luo,Shibin Yin
PtNi alloy nanoparticles display promising catalytic activity for oxygen reduction reaction (ORR), while the Ostwald ripening of particles and the dissolution/migration of surface atoms greatly affect its stability thus restricting the application. Herein, the WO x -surface modified PtNi alloy nanowires (WO x -PtNi NWs) exhibiting enhanced ORR catalytic property is reported, which has high aspect ratio with the diameter of only 2 ∼ 3 nm. It is found that the WO x -PtNi NWs shows a volcano relationship between the ORR activity and the content of WO x . The WO x-(0.25) -PtNi NWs has the best performance among all the synthesized catalysts. Its mass activity (0.85 A mg −1 Pt ) is reduced by only 23.89% after 30k cycles durability test, which is much more stable than that of PtNi NWs (0.33 A mg −1 Pt , 45.94%) and Pt/C (0.14 A mg −1 Pt , 57.79%). Hence this work achieves an effective regulation of the ORR activity for PtNi alloy NWs by the synergistic effect of WO x on Pt.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Jiabin Shen,Shanshan Xu,Cheng Zhao,Xiaopeng Qiao,Haiquan Liu,Yong Zhao,Jing Wei,Yongheng Zhu
In this work, we present a new metal oxide semiconductor gas sensor for detecting trimethylamine (TMA) by bimetal Au@Pt-modified α-Fe2O3 hollow nanocubes (NCs) as sensing materials. The structure and morphological characteristics of Au@Pt/α-Fe2O3 were evaluated through multiple analyses, and their gas-sensitive performance was investigated. Compared with the pristine α-Fe2O3 NC sensor, the sensor based on Au@Pt/α-Fe2O3 NCs exhibited faster response time (5 s) and higher response (Ra/Rg = 32) toward 100 ppm TMA gas at a lower temperature (150 °C). Furthermore, we also assessed the Au@Pt/α-Fe2O3 NC sensor for detecting the freshness of Larimichthys crocea which have been observed by headspace solid-phase microextraction and gas chromatography–mass spectrometry. The high performance of the Au@Pt/α-Fe2O3 NCs is attributed to the special hollow morphology with a high specific surface area (212.9 m2/g) and the synergistic effect of the Au@Pt bimetal. The Au@Pt/α-Fe2O3 sensor shows promising application prospects in estimating seafood freshness on the spot.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 47
·20067-20077
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IF 7.79
Qiugui Zeng,Xin Luo,Yiying Du,Jiexuan Jiang,Lin Yang,Hui Zhao,Heping Shi,Yanbo Li
Metal halide perovskite quantum dots (QDs) hold great promise as building blocks for next-generation light emitting devices (LEDs). The preparation of perovskite QD films with high photoluminescence quantum yield (PLQY) is the key to realizing efficient LEDs. However, the conventional deposition method of spin-coating of pre-synthesized QD ink solutions results in perovskite QD films with low PLQY (typically <45%) due to non-radiative recombination centers induced in the deposition process. Here, by utilizing the ionic nature and steric hindrance effect of the ionic liquid, we demonstrate an in situ deposition method for perovskite QD films with high PLQY by directly spin-coating precursor solutions containing an ionic liquid. Furthermore, mechanistic study reveals that the ionic liquid not only induces the formation of QDs but also suppresses defect-related recombination through the interaction with uncoordinated metal atoms on the surface of the QDs. As a result, the in situ deposited CsPbBr3 QD film with a PLQY as high as 85.2% and long-term air stability is achieved. These findings demonstrate that the introduction of an ionic liquid provides an effective strategy to enhance the performance of in situ formed perovskite QD films, which could benefit the development of efficient LEDs and other optoelectronic devices.
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高影响因子
Nanoscale Advances
·
2021
·Vol. 4
·期 1
·95-101
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IF 4.553
Yanyue Liu,Yingfan Dai,Haifeng Li,Dida Duosiken,Na Tang,Kang Sun,Ke Tao
Gadolinium oxide nanoparticles (GONs) have the potential to be one of the best candidates for the contrast agents of magnetic resonance imaging. Even though the influence of parameters on the relaxation has been substantially demonstrated, the variation of the r1 of GONs with a similar structure and surface chemistry implied our limited understanding. We herein synthesized GONs with adjustable size, shape, and crystallinity, modified them with a series of molecules with different acidities, and recorded their r1 values and imaging contrast. Our results showed that the isoelectric point could be regarded as an indicator of the relaxation covering the influence of both surface modification and size, which highlighted the impact of protons dissociated from the contrast agents. We further showed that the nanoparticles with lower crystallinity possess higher relaxivity, and this phenomenon manifested significantly under a low field. Our work clarified that the longitudinal relaxivity of Gd2O3 nanoparticles is sensitively dependent on the numbers of H+ generated from the surface and in the environment, which may shed light on developing high-performance nanoparticulate T1 contrast agents.
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高影响因子
Crystals
·
2021
·Vol. 11
·期 11
·1287
·
IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
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