NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 23
·11149-11157
·
IF 3.925
Haoran Pan,Yue Wang,Zhenjie Lu,Xinning Huang,Xingxing Chen
High-performance bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are arousing great interest aiming at efficient electrochemical splitting of water. Herein, we report a facile strategy to fabricate Co/Zn sulfide supported on Cu-foam (CoZn-S/Cu-F) as a free-standing electrode with high-performance for overall water splitting. In half-cell electrochemical systems, the overpotentials required to reach the current densities of ±10 mA cm−2 for the OER and HER are only 170 and 130 mV, respectively. After a long-term stability test running 20 000 cyclic voltammograms, the respective potential losses for the OER and HER are only 82 and 41 mV at ±50 mA cm−2. The constructed overall water splitting system driven by simulated solar energy also exhibits prominent performance with gas bubbles continuously generated at both electrodes. A cell voltage of only 1.58 V is required to reach the current densities of ±10 mA cm−2, surpassing the commercialized noble metal and state-of-the-art non-noble metal electrodes. The excellent performance for the overall water splitting is ascribed to the CoS nanoparticles covered with ZnS nanoflocs on the highly conductive Cu-foam, which allows close interfacial contact with the electrolyte, promotes mass and charge transfer, and facilitates desorption of the generated gas from the catalyst surface.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Zhurong Liang,Xueqing Xu,Nan Wang,Jun Fang,Junxia Wang,Gang Xu
Highly Cu-rich copper indium sulfide (CuInS 2 , CIS) quantum dots were synthesized utilizing copper chloride (CuCl) and indium acetate (In(Ac) 3 ) as metal cation precursors, combined with n-dodecanethiol (DDT) as a coordinating sulfur source and solvent. With excess of In(Ac) 3 , i.e. with Cu/In ratios of 1/4, together with Zn 2+ ions post-treatment, a relatively high photoluminescence quantum yield (QY) of ∼73% with long average lifetime of ∼359 ns has been obtained, which is proposed to be attributed to the Cu-rich defect states in the CIS nanocrystals (NCs) nuclei. Meanwhile, the formation of In-rich CIS–ZnS alloy, i.e. Zn–Cu–In–S (ZCIS) with high density of Cu vacancies, combined with the surface passivation of ZnS overlay resulted in a high QY. Finally, the formation mechanism of the ZCIS/ZnS with Cu-rich nuclei has been proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 7
·3009-3017
·
IF 3.5
Fu Yuan,Gong Zhemin,Li Dapeng,Liu Yongxing,Zhou Xiaolong,Yang Yong,Jiao Qing
Solid electrolytes equipped battery show promise in solving energy storage and ecological concerns owing to their excellent electrical conductivity and chemical stability. Only a limited number of substances satisfy the demanding criterion of high ionic conductivity (≥ 10 −3 S/cm), while using non-toxic elements. In this work, the designed Na 3.3 Zn 0.1 Sb 0.9 S 4 electrolyte, a zinc-doped sodium sulfide ion conductor, with a maximum conductivity of 1.48 × 10 −3 S/cm under normal conditions, and a low activation energy of 0.128 eV was achieved. This was ruled by substituting low-valence Zinc for antimony in the SbS 4 3− cell, maintaining efficient ion transport pathways. Additionally, the electrolyte demonstrated strong air stability under humid conditions and emitted minimal H 2 S. The origin of heterovalent ion doping and the impact of thermal effects on electrochemical performance were discussed in detail, which were crucial to promote the development of sodium-ion solid electrolytes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jinwen Hu,Xiangbin Cai,Jiao Wu,Cuncun Xin,Jingya Guo,Ziruo Liu,Jiazhen Wei,Xusheng Cheng,Ce Hao,Haopeng Dong,Guifeng Zhang,Ning Wang,Yongpeng Lei,Wei Liu,Yantao Shi
Endowing the transition-metal-nitrogen-carbon (M-N-Cs) electrocatalysts with high oxygen reduction activity for sustainable energy conversion, is a field of intense research while remains elusive. Here we exploit the variable configuration of atomically dispersed Cu 1 centers on carbon support via rationally constructing prototypical CuN 2+2 active sites to boost the kinetically sluggish electrochemical oxygen reduction. Density functional theory reveals the modified electronic structure of active Cu site and its derived orbital overlap through right symmetry with the degenerate π* orbital of O 2 molecule, which more effectively facilitates O 2 activation compared with CuN 4 counterpart. The targeted electrocatalyst delivers superior alkaline ORR activity with a half-wave potential of 0.88 V and superior kinetics with Tafel slope of 48 mV dec −1 , outperforming those of benchmark Pt/C. Remarkably, further demonstrated excellent peak power density and long-term durability in both primary liquid and flexible solid-state Zn-air battery assemblies signify the potential for practical applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Penghai Wei,Yali Zhang,Yaoguo Huang,Yun Jia,Linlin Chen,Ming Wang
Cyanide wastewater contains highly toxic substances such as cyanide and metals. A simple and efficient photoelectro-catalytic oxidation method was proposed. Effect and mechanism of cyanide degradation and Cu/Zn recovery by photoelectro-catalytic oxidation were investigated. The experimental results show the degradation efficiency of total cyanide and removal efficiencies of copper and zinc reached 96.90%, 99.76% and 90.56%, respectively, under the optimum conditions of 2.5 V external bias voltage and 4.0 h with air and lighting. An external electric field can significantly improve the migration and separation of photo-generated electrons ( e – ) and holes ( h + ), thereby increasing the photocatalytic efficiency. Simultaneously, the surface potential of semiconductor is lower than the body under the action of bias voltage and leads to energy band bending. XPS analysis indicates that cyanide is finally degraded into carbon oxide and nitrogen. Cu and Zn are mainly recovered as elementary substance.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qiang Zhang,Yi Zhang,Liangjie Fu,Sainan Liu,Huaming Yang
The preparation of cathode materials for aqueous Zn-ion batteries (ZIBs) with excellent electrochemical properties is an attractive research focus. However, the large size and high polarization of hydrated zinc ions limit the diffusion kinetics of Zn 2+ /electron, and the side reactions in the system also affect the performance of the battery. Herein, we present a novel hydrophilic self-supporting composite cathode for aqueous ZIBs, which employs V 10 O 24 ·12H 2 O as active materials, acid-treated natural sepiolite and carbon nanotubes as structural and interfacial modifiers. It is demonstrated that the devices exhibit a high specific capacity of 191 mAh g −1 at a current density of 500 mA g −1 (93.6% retention after 100 cycles) and excellent rate performance. This good electrochemical performance is mainly related to the formation of hydrophilic surface/interface, the design of self-supporting and the good conductivity of the composite electrode. Specifically, the addition of acid-treated natural sepiolite and carbon nanotubes could improve the mechanical properties, hydrophilicity and the conductivity of electrode materials, respectively, making this strategy a promising choice for ZIBs.
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高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 28
·3833-3843
·
IF 2.6
Shuting Cui,Yuchao Du,Guoping Li,Qiyong Chen,Ning Tang,Weikun Ge,Lili Xi,Bo Shen,Lijuan Zhao
Gallium oxide (β-Ga2O3) is a well-known extra-wide bandgap semiconductor and one of the promising materials used for power photoelectric devices, gas sensors, catalytic agents, etc. This work presents the suppression of self-trapped holes (STHs) and increase of oxygen vacancies (VO) in β-Ga2O3 microspindles by doping of Zn ions as well as the electrocatalytic activity of these microspindles. Undoped and Zn-doped β-Ga2O3 microspindles were prepared by a hydrothermal method followed by high-temperature calcination. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results show that the morphology and structure of the samples did not change after low dose of Zn doping. The analyses of temperature-dependent photoluminescence (PL) spectra and X-ray photoelectron spectroscopy (XPS) indicate that incorporation of divalent Zn ions as deep acceptors can increase VO concentration and effectively suppress the formation of STHs. Enhanced electrocatalytic activity was observed in Zn-doped β-Ga2O3 microspindles compared with undoped β-Ga2O3 microspindles. The new active sites introduced by Zn doping, higher VO concentration, and suppressed STHs are believed to be responsible for the enhanced electrocatalytic performance of Zn-doped β-Ga2O3 microspindles. This work is expected to expand the application of β-Ga2O3 based microstructures in electrocatalysis and provide innovative ideas for energy and environmental issues.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi Wu,Junliang Chen,Jie Liu,Linjie Zhang,Reza Abazari,Ting-Ting Li,Jinjie Qian
The energy crisis heightens interest in proton exchange membrane fuel cells (PEMFCs), where the oxygen reduction reaction (ORR) is a critical cathodic process hindered by its intrinsic sluggish kinetics. Single-atom catalysts (SACs) at the molecular level, notably those featuring an Fe-N 4 structure derived from iron phthalocyanine (FePc), exhibit significant potential but confront the challenges of aggregation and inadequate electrical conductivity. Herein, we present a novel FePc coupled with defect-rich CoN x -doped hollow carbon nanostraw derived from cobalt-doped indium-based metal–organic frameworks (MOFs). This enhancement is attributed to the CoN x structure’s effective modulation of the Fe-N 4 active sites, further complemented by the hollow nanostraw structure, which significantly increases the accessibility of active sites, thereby promoting enhanced catalytic performance. FePc@HCoNC demonstrates exceptional ORR performance with an oxygen reduction potential of 0.903 V, half-wave potential of 0.914 V, and limiting current density of 5.18 mA cm −2 . For zinc-air batteries (ZABs), FePc@HCoNC achieves an open-circuit voltage of 1.524 V, peak power density of 153.06 mW cm −2 , specific capacity of 758.10 mAh g −1 , and stable cycling for 150 h. These findings underscore its potential as a superior alternative to precious metal-based catalysts, offering a pathway to more sustainable and efficient energy conversion technologies.
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高影响因子
Science Bulletin
·
2020
·
IF 9.511
Linbao Guo,Jiangjian Shi,Qing Yu,Biwen Duan,Xiao Xu,Jiazheng Zhou,Jionghua Wu,Yusheng Li,Dongmei Li,Huijue Wu,Yanhong Luo,Qingbo Meng
Aqueous precursors provide an alluring approach for low-cost and environmentally friendly production of earth-abundant Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells. The key is to find an appropriate molecular agent to prepare a stable solution and optimize the coordination structure to facilitate the subsequent crystallization process . Herein, we introduce thioglycolic acid (TGA), which possesses strong coordination (SH) and hydrophilic (COOH) groups, as the agent and use deprotonation to regulate the coordination competition within the aqueous solution. Ultimately, metal cations are adequately coordinated with thiolate anions , and carboxylate anions are released to become hydrated to form an ultrastable aqueous solution. These factors have contributed to achieving CZTSSe solar cells with an efficiency as high as 12.3% (a certified efficiency of 12.0%) and providing an extremely wide time window for precursor storage and usage. This work represents significant progress in the non-toxic solution fabrication of CZTSSe solar cells and holds great potential for the development of CZTSSe and other metal sulfide solar cells.
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高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 17
·4486-4494
·
IF 7.779
Xiaoling Zeng,Xiaohui Li,Jungu Xu,Xiaoge Wang,Sihao Deng,Lunhua He,Junliang Sun,Xiaojun Kuang,Xianran Xing
Mixed electronic and oxide ionic conduction was introduced in InGe2O7 containing isolated Ge2O7 units through the substitution of Zn2+ for In3+. The solid solution limit of Zn doping in In2−xZnxGe2O7−0.5x is 0–0.2, as confirmed by Rietveld refinements and systematic experiments. The bulk conductivities of the obtained In1−xZnxGe2O7−0.5x (x = 0.2) can reach 1.62 × 10−2 S cm−1 at 1000 °C with oxygen transport number of ∼20%. Moreover, variable temperature XRD patterns of In1−xZnxGe2O7−0.5x (x = 0.2) show the superior phase stability in the temperature region of 25–1000 °C with potential applications in electrode materials for SOFCs. Oxide ion conduction is ascribed to the preferred oxygen vacancies of the O1 site introduced by the substitution of Zn2+ for In3+, and the BVEL calculations indicate that the migration of oxygen vacancies is achieved by oxygen exchange between adjacent Ge2O7 units and exhibits two-dimensional anisotropic transport in monoclinic In2Ge2O7.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-11
·
IF 2.8
Zhang Zhengyu,Yang Yujie,Chen Congliang,Chen Dongyang,Zhang Yingming,Meng Yuting,Li Hao
In this study, Ni–Zn–Co ferrite doped with (Al 3+ ) was synthesized by solid-phase synthesis method and its structure was analyzed. By analyzing the X-ray diffraction (XRD) data, it was explained that the Ni 0.45 Zn 0.40 Co 0.15 Fe 2-x Al x O 4 (0 ≤ x ≤ 0.15) ferrite has a single-spinel structure with FD-3 m space group. Additionally, by analyzing the XRD data, it is found that the lattice constant is the largest when Al 3+ is undoped. The range of lattice constant is (8.3751 ~ 8.3900) Å, the range of saturation magnetization ( M s ) is (68.77 ~ 79.39) emu/g, and the range of coercivity ( H c ) is (9.04 ~ 13.10) Oe. When the content of Al 3+ is 0.09, the permeability reaches the highest. In conclusion, the results obtained indicate that this ferrite is suitable for low-frequency electronic devices and also confirm that Fe 3+ was successfully replaced with Al 3+ . This paper provides a new idea for the study of spinel-structured ferrites by doping Al 3+ .
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高影响因子
IONICS
·
2022
·Vol. 29
·期 1
·429-438
·
IF 2.961
Wei Biying,Wen Meichen,Zhao Yongqing,Yang Chao,Qiu Jianhui,Zang Limin
Aqueous Zn-ion hybrid supercapacitors are increasingly being studied due to their merits for energy storage, such as safety, high capacity, and wearability. Herein, a highly flexible Zn-ion hybrid supercapacitors (FZICs) based on polypyrrole/p-phenylenediamine/carbon fiber (PPy n /PPd/CFY) electrodes is reported. More importantly, the effect of PPy deposition time on the electrochemical performance of the PPy n /PPd/CFY electrode was investigated. Benefiting from better hydrophilicity and higher chemical adsorption capacity of Zn 2+ , the PPy n /PPd/CFY electrode shows better electrochemical performance than that of the pristine CFY electrode. Moreover, the integrated FZICs display excellent electrochemical performances (originated from the capacitive and redox reaction energy storage mechanism) and good flexibility. For example, the FZICs based on PPy 90 /PPd/CFY||Zn@OCFY (oxidized CFY) can possess a specific capacity of 47.6 mAh g −1 at 0.2 A g −1 and maintain 78.5% capacitance retention after 5000 cycles, as well as 85.4% capacitance retention after 1000 bending cycles. This work is expected to provide a new promising electrode for the high-performance, flexible Zn-ion hybrid supercapacitors.
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高影响因子
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