ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Chuang Li,Dan Wang,Norihiro Suzuki,Chiaki Terashima,Yichun Liu,Akira Fujishima,Xintong Zhang
Oxygen evolution over semiconductor photoanodes plays a decisive role in water splitting via photoelectrochemical (PEC) process. While the hematite photoanode with a photocurrent threshold of 600 nm is promising for practical PEC water oxidation, it still suffers from the small minority carrier diffusion length, which makes it difficult to realize adequate light absorption and efficient charge separation concurrently. To address this issue, hematite nanorods were grown on macroporous SnO 2 :Sb substrates, forming a coral-like hematite (ATO-Fe 2 O 3 ) photoanode. The ATO-Fe 2 O 3 photoanode exhibited a 150 mV cathodic shift of onset relative to Fe 2 O 3 nanorods directly on planar SnO 2 :F (FTO-Fe 2 O 3 ). The photocurrent density reached 1.32 mA cm −2 at 1.23 V vs. RHE, approximately 8.8 times higher than FTO-Fe 2 O 3 , and it was further increased to 1.81 mA cm −2 after passivation with a thin TiO 2 overlayer. The improved photocurrent was attributed to the increased light harvesting, reduced charge transfer resistance (R ct ), and smaller contact area of oxygen bubble to hematite photoanode. Our research confirmed the effectiveness of macroporous ATO templated coral-like morphology on balancing the adequate light absorption and efficient charge separation issues of hematite photoanodes. This research may also be applicable to other semiconductor photoanodes for high-efficiency PEC water splitting.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 22
·7322-7329
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IF 7.059
Da Chen,Fulong Dai,Shiqiang Hao,Guojun Zhou,Quanlin Liu,Christopher Wolverton,Jing Zhao,Zhiguo Xia
Organic–inorganic hybrid metal halides have received extensive attention owing to their versatile structures and optoelectronic properties. Herein, we report two lead-free metal halides, (PMA)3BiBr6 and (PMA)3SbBr6 [PMA+: (C6H5CH2NH3)+, as the abbreviation of phenylmethylammonium], which possess iso-structural zero-dimensional structures and crystallize in the monoclinic space group P21/c. (PMA)3BiBr6 and (PMA)3SbBr6 exhibit optical band gaps of ∼3.50 and 3.40 eV, respectively, and density functional theory calculations reveal their indirect bandgap behaviors. Upon 350 and 425 nm excitation, (PMA)3BiBr6 and (PMA)3SbBr6 exhibit broadband emission peaking at 510 nm and 625 nm with wide full-widths at half-maximum of ∼153 and 175 nm, respectively. The emission mechanism of the metal halides is attributed to self-trapped exciton emission. The relationship between the crystal structure and luminescence intensity is also discussed. Finally, both metal halides have high decomposition temperatures and are stable for long-term storage under ambient conditions, demonstrating their potential for optoelectronic applications.
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Photonics Research
·
2021
·Vol. 9
·期 11
·2182-2189
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IF 7.08
Shunfa Gong,Ruirui Wu,Sen Yang,Lifang Wu,Minmin Zhang,Qiuju Han,Wenzhi Wu
The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting, although it has high photoluminescence (PL) efficiency and adjustable emission. Here, lead-free bismuth (Bi) and antimony (Sb) codoped Cs2SnCl6 (BSCSC) microcrystals (MCs) are prepared successfully by a solvothermal method. The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm, of which relative intensity can be tunable through the change of Bi and Sb feeding contents, respectively. Because of the phonon–electron interaction, the PL intensity is enhanced as the temperature rises within the range of 80–260 K. Then, the nonradiative transition is intensified until 380 K, which results in decrease in PL intensity. Simultaneously, combining with time-resolved PL, it is concluded that the emission peak at 485 nm is attributed to the [BiSn+VCl] as the luminescent centers with the lifetime of hundreds of nanoseconds, and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons. The maximum values of relative sensitivity (SR) and absolute sensitivity (SA) values obtained are 3.82% K−1 and 5.11 ns ·K−1, which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry. White-light-emitting diodes (WLEDs) are constructed using BSCSC MCs only combined with an LED chip, the Commission Internationale de L’Eclairage color coordinates of which are (0.30, 0.37). It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Hang Ruan,Zhongnan Guo,Jiawei Lin,Kunjie Liu,Lingling Guo,Xin Chen,Jing Zhao,Quanlin Liu,Wenxia Yuan
The Pb-free hybrid-layered-double perovskites (HLDPs) have been proposed as green and stable semiconducting materials for optoelectronic devices, but the synthesized members are still limited. Here, we report the synthesis of three new HLDPs, (C8H20N2)2AgMBr8 (M = In, Sb, and Bi), by a solution method using 1,4-bis(ammoniomethyl)cyclohexane (C8H20N22+) as the organic spacing cation. All three of these HLDPs show ⟨100⟩-oriented layered structures with Ag and In/Sb/Bi order arranged in corner-sharing octahedral layers. The first-principle calculations indicate the indirect-gap nature of (C8H20N2)2AgInBr8 and (C8H20N2)2AgSbBr8, while their Bi counterpart shows a direct band gap after considering spin–orbit coupling. The band gaps obtained by diffuse-reflectance spectroscopy are 3.11, 2.60, and 2.70 eV for M = In, Sb, and Bi, respectively. (C8H20N2)2AgInBr8 shows a broadband red emission centered at 690 nm, and it is mainly attributed to the self-trapped-excitons mechanism. Our results not only provide a series of new “Pb-free” HLDPs with chemical diversity but also help us to further understand the structure–property relationships of HLDP materials.
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高影响因子
ACS Nano
·
2021
·
IF 15.881
Jingjie Wu,Xianli Li,Xin Lian,Binbin Su,Junhong Pang,Ming-De Li,Zhiguo Xia,Jin Z. Zhang,Binbin Luo,Xiao-Chun Huang
Antimony-based metal halide hybrids have attracted enormous attention due to the stereoactive 5s2 electron pair that drives intense triplet broadband emission. However, energy/charge transfer has been rarely achieved for Sb3+-doped materials. Herein, Sb3+ ions are homogeneously doped into 2D [NH3(CH2)4NH3]CdBr4 perovskite (Cd-PVK) using a wet-chemical method. Compared to the weak singlet exciton emission of Cd-PVK at 380 nm, 0.01% Sb3+-doped Cd-PVK exhibits intense triplet emission located at 640 nm with a near-unity quantum yield. Further increasing the doping concentration of Sb3+ completely quenches singlet exciton emission of Cd-PVK, concurrently with enhanced Sb3+ triplet emission. Delayed luminescence and femtosecond-transient absorption studies suggest that Sb3+ emission originates from exciton transfer (ET) from Cd-PVK host to Sb3+ dopant, while such ET cannot occur with Pb2+-doped Cd-PVK because of the mismatch of energy levels. In addition, density function theory calculations indicate that the introduced Sb3+ likely replace the Cd2+ ions along with the deprotonation of butanediammonium for charge balance, instead of generating Cd2+ vacancies. This work provides a deeper understanding of the ET of Sb3+-doped Cd-PVK and suggests an effective strategy to achieve efficient triplet Sb3+ emission beyond 0D Cl-based hybrids.
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RSC Advances
·
2019
·Vol. 9
·期 51
·29796-29804
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IF 3.049
Yanguang Mu,Cong Huang,Haipu Li,Leilei Chen,Ding Zhang,Zhaoguang Yang
Sb-doped SnO2 electrodes were prepared with the practical sol–gel method and were used for the electrocatalytic degradation of ciprofloxacin (CIP) in aqueous solution. Results from the electrochemical characterization (including cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy) showed that the electrode with 16 coating times (SSO-16) had the highest oxygen evolution potential of 2.2 V (vs. SCE) and the highest electrochemically active area of 3.74 cm2. The results of scanning electron microscopy and X-ray diffraction showed that the coating times could affect the surface morphology and crystal structure of the electrodes, and the SSO-16 electrode had a denser surface, higher crystallinity, and smaller grain size (28.6 nm). Moreover, the experimental parameters for CIP degradation with SSO-16 were optimized, and the removal ratio of CIP reached to almost 100% within 60 min. In addition, the possible degradation pathways of CIP were proposed. And the stability and reusability of the SSO-16 electrode were also studied. These results are valuable for the preparation of high electrocatalytic performance electrodes by a sol–gel coating method for electrochemical degradation of antibiotics.
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INORGANIC CHEMISTRY
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2015
·
IF 4.762
Bo Zhang,Mei-Ling Feng,Hong-Hua Cui,Cheng-Feng Du,Xing-Hui Qi,Nan-Nan Shen,Xiao-Ying Huang
Among numerous heterometallic chalcogenidoantimonates, relatively a few amine-directed Ge–Sb–S compounds have been synthesized. Presented here are the solvothermal syntheses, crystal structures, and ion-exchange, optical, and photocatalytic properties of two novel amine-directed Ge–Sb–S compounds, namely, [CH3NH3]20Ge10Sb28S72·7H2O (1) and [(CH3CH2CH2)2NH2]3Ge3Sb5S15·0.5(C2H5OH) (2). The structure of 1 features an unprecedented two-dimensional Ge–Sb–S double-layer composed of two twofold rotational symmetry-related thick [Ge8Sb28S72]n28n– single layers adhered via vertex-sharing [GeS4] tetrahedra. Compound 2 features a unique [Ge3Sb5S15]n3n– slab perforated with large elliptic-like windows. Remarkably, compound 1 exhibited excellent Cs+ ion-exchange property despite the presence of excess competitive cations, such as Na+, K+, Mg2+, and Ca2+ ions. In addition, compound 1 displayed visible-light-driven photocatalytic activity for degradation of rhodamine B.
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MATERIALS TECHNOLOGY
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2015
·
IF 1.227
Z. L. Zhang,M. L. Wang,Y. L. Mao
In this paper, heterojunction semiconductors of Sb-SnO2/TiO2 were prepared with varying molar ratios of Sb-SnO2 to TiO2. The separation efficiency of the photogenerated carriers was characterised by the surface photovoltage (SPV) technique, and the trap density was measured by an electrochemical method. The trap density was measured to be 7·48×1016, 6·01×1016, 5·43×1016, and 6·61×1016 cm−2 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The SPV enhancement was estimated to be 1, 1·36, 7·64, and 6·36 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The results indicate that SPV enhancement increases with decreasing trap density, which demonstrates that the trap density is an important factor affecting the separation efficiency of photogenerated carriers in heterojunction semiconductors.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yafang Li,Wang Li,Jiawei Lin,Zhongnan Guo,Fan Sun,Xin Chen,Yubo Luo,Junyou Yang,Wenxia Yuan
The ferromagnetic shandite Co3Sn2S2 has attracted great attention in physics and chemistry communities owing to its Kagome net, magnetism, and topological property. Here, for the first time, we report the effect of Sb doping on the crystal structure, magnetic interaction, and transport behavior of this ferromagnetic Weyl semimetal. A relatively low doping limit has been determined as x = 0.1 in a Co3Sn2–xSbxS2 system. Single-crystal X-ray diffraction indicates that the Sb doping shows a preferred occupation at the Sn sites between Kagome layers (Sn(1)) rather than the intralayer sites (Sn(2)), leading to the anisotropic contraction of the lattice. The ferromagnetic interaction is weakened upon Sb doping with the Curie temperature decreased from 172 to 146 K, which resulted from the shifting of the Fermi level toward high energy. Due to the electron injection, the Sb-doped sample shows the declined thermoelectric property with the reduced absolute value of the Seebeck coefficient compared to the parent compound. The anomalous Hall effect is still maintained in Co3Sn1.9Sb0.1S2 with the increased anomalous Hall resistivity based on the measurement on polycrystalline samples. Our work provides a new electron doping system to understand the interplay between the magnetism and quantum properties of this Weyl semimetal.
研究领域:
材料科学
·
物理学
·
化学
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 17
·10260-10268
·
IF 10.7
Yingfen Li,Xingye Chen,Runxi Wang,Nian Zhou,Fang Huang,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
In this study, Sb2S3 was introduced into the two-step selenization process to promote bottom grain growth and reduce the surface roughness of the Cu2ZnSn(S,Se)4 light-absorber layer. The introduction of Sb doping in Cu2ZnSn(S,Se)4 can passivate bulk and interface defects and a small conduction band offset (CBO) can be found, which facilitate the improvement of heterojunction carrier transport properties. Similarly, simulations illustrated that Sb doping improved device efficiency by controlling bulk and interface defects and band alignment. This optimized method facilitated the penetration of Sb, resulting in a high-quality CZTSSe absorber layer. Ultimately, the research culminated in a significant enhancement, yielding a solar cell with an impressive efficiency of 13.11%. These findings offer new possibilities for kesterite solar cells and advance the potential of CZTSSe materials in thin film photovoltaic applications.
研究领域:
材料科学
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光伏技术
·
半导体物理
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薄膜太阳能电池
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无机功能材料
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固态电子学
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shuai Yan,Haomiao Li,Zehang Li,Wenxin Chen,Xianbo Zhou,Hao Zhou,Weixin Zhang,Yaling He,Kai Jiang,Kangli Wang
Liquid metal batteries (LMBs), with the merits of long lifespan and low cost, are deemed as one of the most promising energy storage technologies for large-scale energy storage applications due to the use of liquid metal electrodes and molten salt electrolytes. However, the consequent problem is that the poor wettability between graphite-based collectors and the liquid metal/alloy electrodes leads to large contact resistance, which limits the efficiency and stability of the battery. In this work, a transition layer in situ formed on a graphite-based positive electrode current collector by Ti additive is designed for the first time, which increases the wettability between the positive alloy and the current collector and improves the voltage efficiency of the Li||Sb-Sn cell from 85.6 to 88.4%. These results provide new ideas for the design of high-efficiency LMBs.
研究领域:
能源存储技术
·
材料科学
·
电池技术
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yu Xin,Shuqing Nie,Shi Pan,Chang Miao,Haoyi Mou,Minyue Wen,Wei Xiao
The SnSb and TiO 2 nanoparticles uniformly embedded into continuous and conductive carbon nanofibers (CNFs) are successfully fabricated through facile electrospinning combined with calcination treatments. The characterization results of the targeted composite nanofibers (Sb-SnSb/TiO 2 @CNFs-2) confirm that the presence of TiO 2 is of significant importance to construct the elaborately designed and intact fiber structure, in which the optimal dosage of the TiO 2 precursor is precisely controlled at 2 mmol. Moreover, high theoretical specific capacity of SnSb, available inhibitory effect of TiO 2 , and great electronic conductivity of CNFs are cooperatively integrated into the Sb-SnSb/TiO 2 @CNFs-2 composite nanofibers, guaranteeing the enhanced lithium storage capacity and cycling performance when being employed as the anode electrodes. Specifically, the Sb-SnSb/TiO 2 @CNFs-2 electrode can not only deliver initial discharge specific capacity of 1146.6 mAh/g at 100 mA/g and reversible discharge specific capacity of 580.4 mAh/g after 100 cycles, but also retain discharge specific capacity of 561.3 mAh/g after rate cycles along with recovering the current density to 100 mA/g. Importantly, the Sb-SnSb/TiO 2 @CNFs-2 electrode is also endowed with prominent advantages in the pseudocapacitive contribution of 66.89 % at 0.8 mV/s. Those investigations and findings of the Sb-SnSb/TiO 2 @CNFs-2 composite electrodes with facile fabrication process and excellent electrochemical performance can contribute to the practical application of the alloy anodes in the field of the energy storage.
研究领域:
材料科学
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能源存储
·
纳米技术
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高影响因子
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