Colloidal Synthesis and Charge‐Carrier Dynamics of Cs2AgSb1−yBiyX6 (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals

Yang, Bin; Hong, Feng; Chen, Junsheng; Tang, Yuxuan; Yang, Li; Sang, Youbao; Xia, Xusheng; Guo, Jingwei; He, Haixiang; Yang, Songqiu; Deng, Wei; Han, Keli

doi:10.1002/anie.201811610

Cited by 222 publications

(144 citation statements)

References 53 publications

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“…In general, the halide ions can i ) affect the reduction potential of a salt precursor through the formation of PdX 4 2− (X=Cl − or Br − ), ii ) alter the order of surface free energies of different facets on the seed via chemisorption and thus change the relative growth rates of different facets, and iii) induce localized oxidative etching on a specific facet of the seed to initiate anisotropic growth . All these changes can impact the reduction kinetics and even reduction pathway of a precursor, enabling the formation of nanocrystals with diverse shapes . However, the understandings derived from early studies were primarily based on qualitative observations and empirical laws, in which the reduction was typically described using qualitative terms such as “slow” and “fast” and the synthesis usually involved a trial‐and‐error approach in reaching the optimal conditions.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

et al. 2020

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Despite the pivotal roles played by halide ions (e. g., Cl− and Br−) in directing the evolution of seeds into metal nanocrystals with diverse shapes, it is still unclear how halides affect the reduction kinetics of a salt precursor and thus the outcome of a synthesis. Here we report a quantitative analysis of the multiple roles played by halides in controlling the growth behaviors of Pd seeds with cubic and octahedral shapes, respectively. Our quantitative measurements clearly indicate the existence of a transition point around 10−3 mM min−1 for the reduction rate, which separates the reduction into two distinctive pathways (solution versus surface) for the formation of completely different products. More significantly, we demonstrate that the speciation, reduction kinetics, and reduction pathway of a Pd(II) precursor can all be manipulated by varying the type and/or amount of halides introduced into a synthesis for the deterministic formation of a specific product. This work represents a critical step forward in achieving a quantitative understanding of the multiple roles of halides involved in the shape‐controlled synthesis of Pd nanocrystals, with the knowledge potentially extendible to other noble metals and their alloys.

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Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

et al. 2020

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“…But it was usually used as absorber of the solar cell rather than the light‐emitting device . Up to now, several studies have reported the synthesis of colloidal double perovskite NCs including Cs 2 AgBiX 6 (X = Cl, Br, and I), Cs 2 AgSb 1− y Bi y X 6 (X = Br and Cl; 0 ≤ y ≤ 1) and Cs 2 AgIn x Bi 1− x Cl 6 ( x = 0, 0.25, 0.5 0.75, and 0.9) NCs . The reported highest PLQY is ≈36.6% .…”

mentioning

confidence: 99%

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Niu

Zheng

et al. 2019

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Recently, Bi‐doped Cs2Ag0.6Na0.4InCl6 lead‐free double perovskites demonstrating efficient warm‐white emission have been reported. To enable the solution processing and enrich the application fields of this promising material, here a colloidal synthesis of Cs2Ag1−xNaxIn1−yBiyCl6 nanocrystals is further developed. Different from its bulk states, the emission color temperatures of the nanocrystal can be tuned from 9759.7 to 4429.2 K by Na+ and Bi3+ incorporation. Furthermore, the newly developed nanocrystals can break the wavefunction symmetry of the self‐trapped excitons by partial replacement of Ag+ ions with Na+ ions and consequently allow radiative recombination. Assisted with Bi3+ ions doping and ligand passivation, the photoluminescence quantum yield of the Cs2Ag0.17Na0.83In0.88Bi0.12Cl6 nanocrystals is further promoted to 64%, which is the highest value for lead‐free perovskite nanocrystals at present. The new colloidal nanocrystals with tunable color temperature and efficient photoluminescence are expected to greatly advance the research progress of lead‐free perovskites in single‐emitter‐based white emitting materials and devices.

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“…The Ni 2p spectrum (Figure c) was fitted with two bands with two shake‐up satellites. The peak at 856.0 eV (Ni 2p 3/2 ) is ascribed to Ni 2+ and the binding energy at 873.6 eV (Ni 2p 1/2 ) is indexed to Ni 3+ . The S 2p spectrum (Figure d) presents two bands at 163.7 (S 2p 3/2 ) and 164.5 eV (S 2p 1/2 ), suggesting the existence of S 2− in Ni 3 S 2 .…”

Section: Resultsmentioning

confidence: 97%

Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

Cheng

Yang

Han

et al. 2020

Batteries & Supercaps

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In this work, a hierarchical 2D polyaniline (PANI)/Ni3S2 nanosheet arrays on Ni foam (NF) with open network was successfully developed by the growth of Ni3S2 nanosheet arrays derived from 2D Ni−MOF templates followed by the electrodeposition of a layer of PANI nanoflakes. The as‐prepared PANI/Ni3S2/NF was served as self‐standing supercapacitor electrode. The optimized PANI/Ni3S2/NF‐100 electrode exhibits a high areal capacity of 1.56 mA h cm−2 (487.5 mA h g−1) at 5 mA cm−2 and good rate capability (57.7 % retention at 50 mA cm−2), which significantly outperforms individual PANI/NF or Ni3S2/NF. Furthermore, an asymmetric supercapacitor fabricated by PANI/Ni3S2/NF‐100 and activated carbon electrodes can deliver a high energy density of 48.3 W h kg−1 at a power density of 799.8 W kg−1 with outstanding durability (85.7 % retention of the initial capacity) during 15000 consecutive charge‐discharge cycles. The superior electrochemical performance of PANI/Ni3S2/NF‐100 is attributed to the unique hierarchical PANI/Ni3S2 nanosheet arrays structure. Firstly, the hierarchical open network facilitates the electrolyte ions transport. Secondly, the ultrathin 2D Ni3S2 nanosheets lead to abundant electroactive sites for the Faradaic process, and the conductive PANI layer builds superb highway for fast electron transfer. Thirdly, the free‐standing electrode enables fast redox reaction and low interfacial resistance. Finally, the synergetic effect of Ni3S2 and PANI also contributes to the enhanced capacity.

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Colloidal Synthesis and Charge‐Carrier Dynamics of Cs₂AgSb_1−yBi_yX₆ (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals

Cited by 222 publications

References 53 publications

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

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Colloidal Synthesis and Charge‐Carrier Dynamics of Cs2AgSb1−yBiyX6 (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals

Cited by 222 publications

References 53 publications

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

Quantitative Analysis of the Multiple Roles Played by Halide Ions in Controlling the Growth Patterns of Palladium Nanocrystals

Tunable Color Temperatures and Efficient White Emission from Cs2Ag1−xNaxIn1−yBiyCl6 Double Perovskite Nanocrystals

Construction of Hierarchical 2D PANI/Ni3S2 Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors

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Colloidal Synthesis and Charge‐Carrier Dynamics of Cs₂AgSb_1−yBi_yX₆ (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Construction of Hierarchical 2D PANI/Ni₃S₂ Nanosheet Arrays on Ni Foam for High‐Performance Asymmetric Supercapacitors