APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Gang Fang,Jiaojiao Gao,Juan Lv,Henglei Jia,Huanglong Li,Weihong Liu,Guoqiang Xie,Zuhuang Chen,Yan Huang,Qunhui Yuan,Xingjun Liu,Xi Lin,Shuhui Sun,Hua-Jun Qiu
Multi-component high-entropy alloys (HEAs) and their corresponding high-entropy oxides (HEOs) provide great flexibility in modulating the electronic properties and catalytic activities due to the interaction of five or more different metal species. Herein, a top-down dealloying strategy is used to fabricate various noble-metal-free nanoprous HEAs covered with naturally oxidized multi-component surface oxides (HEOs). By tuning the compositions of these nanostructured HEA/HEOs, a bifunctional AlFeCoNiCr oxygen electrocatalyst is discovered. When used in aqueous Zn-air batteries, it delivers an open-circuit potential of 1.55 V, and a high specific capacity of ∼800 mA h g −1 . When assembled in solid-state Zn-air batteries, it exhibits a small discharge/charge potential gap of 0.76 V at 2 mA cm -2 and can be stably cycled for 60 h. Higher performance electrocatalysts are potentially available by exploring a larger design space of the HEA/HEO system.
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Energy Technology
·
2021
·Vol. 9
·期 8
·2100069
·
IF 3.631
Chaojun Liu,Xin Zong,Yingmin Jin,Ruifan Lin,Yueping Xiong
Electrospinning is an efficient and facile method to prepare carbon nanofibers (CFs) embedded with a NiCo alloy as efficient oxygen electrocatalysts for Zn–air batteries. The subsequent pyrolysis of electrospun-woven is significant to the crystallization degree of CFs and NiCo alloy. Herein, the effect of the crystallization degree of the alloy and carbon on the oxygen electrocatalytic activity is explored through controlled thermal engineering (the annealing temperature). As the temperature increases, the degree of crystallization and agglomeration of nanoparticles increases simultaneously, accompanied by the increase of the graphitization degree of CFs. Among all the samples, NiCo/CF-800 exhibits the best oxygen bifunctional catalytic activity (Δ E = 0.73 V). A Zn–air battery based on the NiCo/CF-800 catalyst exhibits a high peak power density (168.6 mW cm −2 ), high specific capacity (802.6 mA h g Zn −1 ), and excellent charge/discharge cycling stability. This work provides new insight into catalysts through thermal engineering, promoting the practical application of electrospinning as a large-scale production method.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12429-12437
·
IF 14.511
Shuang Li,Yunxiang Hou,Di Li,Bo Zou,Qingtang Zhang,Yang Cao,Guodong Tang
SnSe is considered one of the most intriguing new thermoelectric materials. Polycrystalline SnSe offers a wide range of thermoelectric applications due to its facile synthetic processing and machinability. Herein, we have achieved a high average ZT of 0.8 as well as a high peak ZT of 1.86 in solution-synthesized porous Zn and Ga codoped SnSe nanosheets, generating a maximum energy conversion efficiency of 13.3%. High-density micro/nanopores are induced in the SnSe matrix, which are more effective for scattering phonons and reducing the thermal conductivity. The high density of micro/nanopores, nanosheet structure and dislocations contribute to an ultralow lattice thermal conductivity (0.157 W m−1 K−1 at 873 K). Meanwhile, Ga incorporation can induce band convergence and create resonance levels, producing a large Seebeck coefficient. Ga and Zn codoping contributes to a sharp increase in carrier concentration and an obviously increased electrical conductivity. The enhanced Seebeck coefficient and increased carrier concentration help in achieving a significant enhancement of the power factor over a wide temperature range in the porous Zn and Ga codoped SnSe nanosheets. Consequently, high thermoelectric performance is realized over a wide temperature range via the decoupling of electron–phonon transport in SnSe. This work opens up a great opportunity for designing prospective materials for thermoelectric applications with the aid of the solution synthesis route.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
能源材料
·
半导体物理
·
热电转换
·
无机功能材料
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高影响因子
ACS Nano
·
2021
·
IF 15.881
Xinliang Li,Qing Li,Yue Hou,Qi Yang,Ze Chen,Zhaodong Huang,Guojin Liang,Yuwei Zhao,Longtao Ma,Mian Li,Qing Huang,Chunyi Zhi
The renaissance of aqueous Zn ion batteries has drawn intense attention to Zn metal anode issues, including dendrites growth, dead Zn, low efficiency, and other parasitic reactions. However, against the widely used 2D Zn foil, in fact, the Zn powder anode is a more practical choice for Zn-based batteries in industrial applications, but the related solutions are rarely investigated. Herein, we focus on the Zn powder anode and disclose its unknown failure mechanism different from Zn foils. By utilization of 2D flexible conductive Ti3C2Tx MXene flakes with hexagonal close-packed lattice as electrons and ions redistributor, a stable and highly reversible Zn powder anode without dendrite growth and low polarization is constructed. Low lattice mismatch (∼10%) enables a coherent heterogeneous interface between the (0002) plane of deposited Zn and (0002) plane of the Ti3C2Tx MXene. Thus, the Zn2+ ions are induced to undergo rapid uniform nucleation and sustained reversible stripping/plating with low energy barriers via the internally bridged shuttle channels. Paired with cyano group iron hexacyanoferrate (FeHCF) cathode, the FeHCF//MXene@Zn full battery delivers superior cycle durability and rate capability, whose service life with a CE of near 100% touches 850% of bare Zn powder counterparts. The proposed Ti3C2Tx MXene redistributor strategy concerning high-speed electrons/ions channel, low-barrier heterogeneous interface, is expected to be widely applied to other alkali metal anodes.
研究领域:
储能与转换
·
材料科学
·
电化学
·
纳米材料
·
电池技术
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jianwei Zhang,Yuting Wang,Xutong Wang,Wenzhu Wu,Xiaoqiang Cui,Zhanjun Cheng,Beibei Yan,Xiaoe Yang,Zhenli He,Guanyi Chen
The harmless treatment of heavy metal-enriched hyperaccumulator biomass is the main barrier to the industrialization of phytoremediation . Hydrothermal conversion of Sedum alfredii using different solvents (i.e ·H 2 O and HCl) at 210–300 ℃ was performed to investigate the behaviors of Cd and Zn, and the characteristics and potential application of the derived hydrochars were determined. Low temperature and HCl addition favored the removal of Cd/Zn from the solid phase. The highest removal efficiencies of Cd (95.0%) and Zn (89.3%) were achieved at 210 ℃ with the presence of HCl. The yield, pH, ash content, element concentration, functional groups, and crystalline minerals of the derived hydrochar were influenced by the reaction temperature and addition of HCl. The leaching risk of Cd and Zn was significantly reduced by hydrothermal conversion. The addition of HCl facilitated the immobilization of Zn, while it enhanced the mobility of Cd. Moreover, the hydrochar derived at 210 ℃ showed increased sorption capacity towards Cu, and the addition of HCl greatly improved the energy density of hydrochar. These results suggest that HCl-mediated hydrothermal conversion could be a promising technique to achieve the separation of Cd and Zn from hyperaccumulator biomass as well as the production of value-added hydrochar.
研究领域:
环境科学
·
生物修复
·
废物处理
·
生物能源
·
重金属化学
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高影响因子
DALTON TRANSACTIONS
·
2012
·Vol. 41
·期 37
·11507-11518
·
IF 3.838
Minfeng Lü,Xiaolong Deng,João C. Waerenborgh,Xiaojie Wu,Jian Meng
The n = 1 Ruddlesden–Popper (RP) phases LaSrM0.5Ru0.5O4±δ (M = Co, Ni and Zn) have been prepared by solid state reactions and structurally characterized by powder X-ray and electron diffraction. All the samples adopt the tetragonal I4/mmm space group with random M and Ru cation occupation on the B-sites. The potential causes of no cation ordering are discussed. A combined analysis of the tolerance factors, the distortion of the octahedral coordination of M and Ru cations and the magnetic interactions between M and Ru cations provide a better understanding for forming a phase with 3D cation ordering on the B-sites in the n = 1 RP phases. The investigation of XPS spectra suggests that the transition element species exist as mixed ion pairs, Ru(4−δ)+–Ru4+ ↔ Co2+–Co3+ in LaSrCo0.5Ru0.5O4, and Ru4+–Ru(4+δ)+ ↔ Ni+–Ni2+ in LaSrNi0.5Ru0.5O4, which is consistent with cation disorder over the B sites. LaSrCo0.5Ru0.5O4 shows a weakly ferromagnetic behaviour below 50 K; LaSrNi0.5Ru0.5O4 is evidenced by the presence of long-range magnetic ordering at a Néel temperature of 125 K, and LaSrZn0.5Ru0.5O4 exhibits a paramagnetic behaviour down to 5 K. Due to atomic disorder, Ru4d, O2p covalent coupling is weakened, strengthening the intraatomic spin–spin coupling among the π* electrons. Charge transfer between Ru and Co or Ru and Ni, as well as the increasing overlap of both nearest-neighbour and next-nearest-neighbour Ru 4d electrons due to atomic disorder, favour the formation of ferromagnetic interactions. Although antiferromagnetism is dominant, particularly in LaSrNi0.5Ru0.5O4, ferromagnetic interactions are stronger in the title compounds than in the related La2MRuO6 (M = Co, Ni) double perovskites where the B-site cations are ordered.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·168
·
IF 36.3
Zhou Yifan,Pan Yicai,Yang Yongqiang,Altamimi Taghreed F.,Zhong Yunpeng,Alshammari Dalal A.,El-Bahy Zeinhom M.,Liang Shuquan,Zhou Jiang,Cao Xinxin
Recent advancements in Zn-halogen batteries have focused on enhancing the adsorptive or catalytic capability of host materials and stabilizing complex intermediates with electrolyte additives, while the halogen-ion electrolyte modifications exhibit strong potential for integrated interfacial regulation. Herein, we design an electrically insulating rigid electrolyte container to immobilize a liquid halogen-ion electrolyte for separator-free Zn-halogen batteries with customizable electron transfer. Robust hydrogen bonding of hydroxyl groups in SiO 2 with fluorinated moieties in PVDF- hfp regulates Zn 2+ solvation and suppresses H 2 O activity, while multi-channels formed by microcracks and interparticle gaps not only enhance mass transfer but also buffer interfacial electric field, jointly enabling a durable Zn plating/stripping. Effective confinement of intermediates also ensures the high reversibility across single-(I − /I 0 ), double-(I − /I 0 /I⁺), and triple-(I − /I 0 /I⁺, Cl − /Cl 0 ) electron transfer mechanisms at cathode, as evidenced by the double-electron transfer systems exhibiting a low capacity decay rate of 0.02‰ over 4500 cycles at 10 mA cm −2 and a high areal capacity of 11.9 mAh cm −2 at 2 mA cm −2 . This work presents a novel “container engineering” approach to halogen-ion electrolyte design and provides fundamental insights into the relationships between redox reversibility and reaction kinetics.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Sonu Kumar,Hassan Rokni,Mukaddar Sk,Mahesh Kumar Ravva,Marek Piotrowski,Zhiming Wang,Udayabhaskararao Thumu
While morphological control in metal–organic frameworks (MOFs) has been widely explored, the extension of this concept to compositional engineering and precise anisotropic growth in high-entropy systems has only recently emerged. Herein, we present the first synthesis of one-dimensional single-crystal HE-MOF-74 nanorods (comprising Co, Fe, Ni, Zn, and Mo) via a dual strategy, where zinc-directed anisotropic growth occurs exclusively on a graphene oxide support. In situ Raman spectroscopy combined with molecular probe electroanalysis and DFT analysis reveal two simultaneous catalytic pathways. (i) The oxophilic Mo promotes the adsorbate evolution mechanism (AEM) with Ni centers (Ni–Ni*-Mo), (ii) Zn enhances the covalency of the M–O bonds, specifically favoring Fe–O/Co–O covalency to activate the lattice-oxygen-mediated mechanism (Co/Fe–O*-Zn). This synergistic dual-pathway mechanism in the HE-MOF nanorod is directly responsible for the exceptional electrocatalytic performance, which includes an ultralow OER overpotential of 220 mV and remarkable stability sustained for 250 h at a high current density of 100 mA cm–2. It also demonstrates superior performance for urea (UOR, 1.32 V at 10 mA cm–2), ethanol (EOR, 1.31 V at 10 mA cm–2), and methanol (MOR, 1.355 V at 10 mA cm–2) oxidation reactions, significantly outperforming its lower-entropy counterparts. This work demonstrates how Zn ions, supported by graphene oxide, play a crucial role in directing anisotropic growth in high-entropy systems, while simultaneously activating dual-mechanistic pathways to synergistically enhance multianodic reactions.
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PubMed
高影响因子
ENERGY & FUELS
·
2026
·Vol. 40
·期 34
·19151-19159
·
IF 6
Wang Yicun,He Deqing,Shi Huangang,Zhang Xiao,Xiao Beibei,Su Chao
Under
air operation, Sr-containing perovskite cathodes lose activity
mainly because the surface Sr species readily react with CO 2 , rather than because the intrinsic Co/Fe redox centers are insufficiently
active. A mild acid treatment was introduced to selectively regulate
the surface A-site environment of perovskite oxides, with the aim
of suppressing Sr-derived carbonation while retaining the perovskite
backbone. The mild acid treatment preferentially regulates Sr-related
surface species and partially reconstructs the outermost A-site coordination
environment, while the long-range perovskite framework remains largely
retained. Such surface A-site modification is accompanied by local
charge rebalancing, a shifted electronic state of Co/Fe species, and
a higher population of catalytically relevant oxygen-deficient sites,
which collectively accelerate oxygen reduction and oxygen evolution
reaction kinetics. Benefiting from the reconstructed surface chemistry,
the optimized catalyst delivers faster ORR/OER kinetics and, when
used in a rechargeable zinc-air battery, affords an open-circuit voltage
of 1.50 V, a peak power output of 102.66 mW cm –2 , and a discharge capacity of 805 mAh g –1 . Under
ambient-air operation, the device sustains long-term cycling beyond
300 h, which is consistent with the substantially alleviated carbonate
accumulation on the catalyst surface. This work highlights the critical
role of A-site chemical stability in designing carbonation-resistant
perovskite air cathodes and provides an effective strategy for developing
durable bifunctional oxygen electrocatalysts for practical metal-air
batteries.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Huaiyu Li,Chenxi Xu,Wei Wang,Gangyong Li,Junlin Huang,Liang Chen,Zhaohui Hou
The development of single atom catalysts is considered as a hotspot in the field of electrocatalysis. As the representative of single atom catalysts, metal and nitrogen co–doped carbon (M N C) attracts worldwide attentions due to its great potential in the application of oxygen reduction reaction (ORR). However, the actual preparation of M N C still confronts with tedious procedure, harsh condition and relatively low loading of single metal atom. In this work, we successfully prepare high–loading 3D Co N C architecture by a facile oxidation polymerization followed by pyrolysis process employing 3D nitrogen–doped graphene hydrogel (NGH) and pyrrole (PY) as the reaction precursors. Benefitting from the individual advantages of 3D NGH and PY, the resultant 3D Co N C possesses unique 3D architecture, high–loading single Co atom (2.74 wt%), large specific surface area and enriched mesopores, which benefit the exposure of sufficient catalytic sites and facilitate electrons transfer and ions transport, thus generating much enhanced ORR performance. When used as the cathode catalyst for zinc–air batteries (ZABs), it shows comparable performance with commercial Pt/C catalyst. Clearly, our finding offers a good guidance on the design and synthesis of advanced high–loading single atom catalysts.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 16
·5119-5126
·
IF 4
Liubing Fan,Shiqiang Hao,Shihui He,Xusheng Zhang,Mingyang Li,Christopher Wolverton,Jing Zhao,Quanlin Liu
Organic–inorganic hybrid metal halides have been extensively studied because of their great potential in optoelectronics. Herein, we report three hybrid metal halides (Bmpip)2ZnBr4, (Bmpip)2CdBr4, and (Bmpip)8Pb11Br30 (where Bmpip+ is 1-butyl-1-methyl-piperidinium, C10H22N+). (Bmpip)2ZnBr4 and (Bmpip)2CdBr4 crystallize in the P21/c space group with zero-dimensional crystal structures with [MBr4]2− (M = Zn, Cd) tetrahedra isolated by Bmpip+. (Bmpip)8Pb11Br30 crystallizes in the triclinic space group P with one-dimensional corrugated chains constructed from face-sharing [PbBr6]4− octahedra. All of the compounds exhibit excellent ambient and thermal stability. Under UV excitation, all three compounds exhibit very broad emissions. Temperature-dependent photoluminescence measurements indicate that the broad emissions of (Bmpip)2ZnBr4 and (Bmpip)2CdBr4 can be attributed to both the organic cations and self-trapped excitons (STEs) and that the emission of (Bmpip)8Pb11Br30 is assigned to STEs. Density functional theory calculations reveal that the three compounds adopt a direct band gap. This work enriches our understanding of the structure types of hybrid metal halides while revealing their diverse emission mechanisms.
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PubMed
高影响因子
Forests
·
2023
·Vol. 14
·期 4
·783
·
IF 2.9
Lulu Gao,Aoying Zhang,Shanchun Yan
Heavy metals are serious pollutants that affect the growth and disease resistance of woody plants. Herein, the enrichment characteristics of an essential element (Zn) inPopulus simoniiseedlings, as well as the effects of Zn stress on seedling growth and resistance to leaf rust, were investigated. Zn contents in roots, stems, and leaves of treatment groups were significantly increased. Zn stress at all concentrations significantly inhibited the biomass of seedlings. Under the low, middle, and high Zn treatments, compared with the control group, CAT activity significantly decreased by 36%, 21%, and 14%; SOD activity significantly decreased by 13%, 8%, and 5%; PPO activity significantly decreased by 27%, 31%, and 47%; TI activity significantly decreased by 48%, 55%, and 61%, and CI activity significantly decreased by 10%, 20%, and 14%, respectively. In the natural environment, we accidentally discovered thatP. simoniiwas infected with leaf rust, and Zn stress significantly increased the rust disease index. The disease index correlated positively with Zn content in leaves and negatively with the chemical defense indexes. Taken together, Zn stress causes a strong growth toxicity inP. simoniiseedlings, and the reduced chemical defense under Zn stress increases the susceptibility of seedlings to leaf rust.Keywords:essential element;Populus simonii;growth;chemical defense;leaf rust
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