CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuxiao Hu,Kai Zhang,Jiayin Shang,Qiguan Wang,Jiale Chen,Hong Deng,Yuxin Cui,Sumin Wang
Aqueous zinc-ion hybrid capacitors (ZIHCs) are an ideal candidate for energy storage resulted from their low cost and high safety. Nonetheless, their wide applications have been hindered by the sluggish migration kinetics of Zn 2+ , low activity and low structural stability of cathodes during prolonged cycles. Herein, we report a supermolecular route by using two small molecules (melamine and cyanuric acid) inhaled in the interlayered space of expanded graphite (EG) flakes, where they are self-assembled into N-containing supermolecules. After calcination at high temperature, the supermolecules sandwiched in EG are converted to N-containing carbon spherical nanoparticles (NCSN). The insertion of NCSNs enlarges interlayered distance and the nitrogen and oxygen groups on NCSN enhance Zn 2+ adsorption, which boosts the transfer dynamics of zinc ions. Meanwhile, the in-situ formed NCSNs enhance the specific surface area of EG. Thus the fabricated ZIHCs employing the NCSN inserted EG (NCSN@EG) as the cathode deliver a high specific capacity of 355.6 F g −1 with the energy density of 142.7 Wh kg −1 and power density high as 170.2 W kg −1 in the voltage range of 0–1.7 V. In addition, the in-situ formed NCSNs strengthen the stacked two-dimensional structure of EG as bridges, and after 30,000 cycles, the capacity retention rate is as high as 87.2 %.
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Energy Storage Materials
·
2024
·
IF 18.9
Xiongri Gan,Chenran Zhang,Xiushen Ye,Long Qie,Kaiyuan Shi
Zinc-ion hybrid capacitors (ZICs) that combine the characteristics of metal-ion batteries and supercapacitors are emerging to fulfill high energy-power demands. The objective of this study is to address the challenges in the practical implementation of metallic zinc for ZICs. In this work, we explore redox molecules based on anthraquinone compounds as electrolyte additives for the interfacial engineering of Zn anodes. The results reveal that the additives enable favorable solvation of Zn 2+ through metal ion-ligand coordination. The redox additives improve the lifespan of Zn//Zn cells from 50 to 1600 cycles at 2 mA cm −2 and 1 mAh cm −2 due to the suppression of parasitic reactions and the mitigation of by-product formations. The redox properties of additives strengthen the pseudocapacitive behavior of the ZICs, enabling efficient interfacial charge and mass transfer. The redox-enhanced device manifests an increased capacity of 195.0 mAh g − 1 with improved cycling stability, compared to that of 149.6 mAh g − 1 for the additive-free electrolyte. The universal strategy, based on the synergistic effects of redox additives, is demonstrated by a collection of molecules with similar structures. This work unveils a conceptually new approach that utilizes redox additives to formulate advanced electrolytes for aqueous energy storage.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Dexu Zhang,Xiaoying Peng,Jie Zhang,Shixuan Zhu,Zhihong Xue,Shubin Xiong,Shuai Xiong,Bo Sheng,Yiqiang He,Guiming Peng,Jiadong Zhang
Graphitic carbon nitride (g-C 3 N 4 ) has become a favored universal photocatalyst. Despite its numerous advantages, the photocatalytic efficiency of g-C 3 N 4 is hindered by the substantial recombination of photoexcited charge carriers and holes. In this work, we demonstrate that Zn-doped tubular carbon nitride photocatalyst (Zn-tCN) can serve as highly efficient catalysts for H 2 O 2 photosynthesis. Mechanism studies confirm that the presence of Zn in g-C 3 N 4 prolongs the lifetimes of photogenerated carriers and inhibits their recombination, which triggers the reduction of O 2 to reaction intermediates ( O 2 − ), as supported by in situ electron paramagnetic resonance (EPR) spectroscopy. More importantly, sacrificial agent experiments coupled with in situ EPR results confirmed that the reaction mechanism involves a concerted two-electron transfer process. The optimal catalyst displays a H 2 O 2 productivity of 162.4μmol g –1 h −1 under visible-light irradiation without a sacrificial agent, which is 11.7 times higher than that of pristine g-C 3 N 4 (13.8μmol g –1 h −1 ). This work proposes a synthetic strategy for the preparation of high-performance Zn-doped g-C 3 N 4 , which offers insights and perspectives for developing highly active photocatalysts and deepening the understanding of photocatalytic mechanisms.
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Small
·
2024
·Vol. 20
·期 38
·2402466
·
IF 13
Yibin Ren,Jianbo Li,Yi Zhang,Yunhui Huang,Zhen Li
Aqueous Zinc–sulfur (Zn–S) batteries are promising for the field of energy storage due to their low cost, high theoretical capacity, and safety. However, the large volume expansion and the inherently poor conductivity of sulfur would result in electrode cracking and sluggish reaction kinetics, limiting the practical application of Zn–S batteries. Herein, commercial zinc sulfide (ZnS) is employed instead of S as cathode and proposed a doping modification strategy to solve the above problems. The designed ZnS 0.93 Se 0.07 cathode shows good cycle stability and much-improved reaction kinetics, which is due to the smaller bandgap of ZnS 0.93 Se 0.07 (1.40 eV) compared to ZnS (1.86 eV). As a result, the obtained ZnS 0.93 Se 0.07 cathode exhibits a high specific capacity of 552 mAh g −1 (1672.6 mAh g −1 based on S) at 0.1 A g −1 and 330 mAh g −1 (1000 mAh g −1 based on S) at 2 A g −1 . Moreover, the ZnS 0.93 Se 0.07 cathode can provide a high areal capacity of 3.8 mAh cm −2 at a high mass loading of 10 mg cm −2 and limited electrolyte (4 µL mg −1 ). This work provides a simple and effective cathode modification strategy, which is conducive to promoting the practical application of Zn–S batteries.
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Carbon Energy
·
2024
·Vol. 6
·期 9
·e535
·
IF 19.5
Zhimin Niu,Yan Gao,Tianhui Wu,Fei Zhang,Ran Zhao,Zijia Chen,Yiming Yuan,Tifeng Jiao,Jianmin Gu,Li Lu,Desong Wang
Rechargeable neutral aqueous zinc−air batteries (ZABs) are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs. However, the neutral ZABs normally possess poor oxygen evolution reactions (OERs) and oxygen reduction reactions performance, resulting in a large charge–discharge voltage gap and low round-trip efficiency. Herein, we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO 4 (Fe-BiVO 4 ) as an oxygen catalyst. Under sunlight, the electrons move from the valence band (VB) of Fe-BiVO 4 to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential. Meanwhile, the photopotential generated by the Fe-BiVO 4 compensates a part of the charging potential of neutral ZABs. Accordingly, the energy loss of the battery could be compensated via solar energy, leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%. This work offers a simple but efficient pathway for solar-energy utilization in storage devices, further guiding the design of high energy efficiency of neutral aqueous ZABs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yudong Li,Zhenyu Yuan,Boyuan Wang,Hao Wang,Fanli Meng
The gas sensing performance of transition metal-based metal oxides primarily relies on their geometric configuration . This study focuses on bimetallic oxides composed of elements Zn and Co, aiming to enhance the gas-sensing capabilities of the sensor by precisely adjusting the exposure level of monotypic active configurations and the bimetallic composite ratio. The test results show that the Co-Zn-O sensitive material synthesized by a simple solvothermal method has a good detection effect on toluene. Notably, the optimized sample exhibited a 61 % response to 100 ppm toluene at an operating temperature of 140°C, with a theoretical detection limit as low as 0.243 ppm. Various characterizations elucidate the feasibility of fine-tuning the active site content by manipulating the composition of the samples to realize the minimal detect unit of Zn 1-x Co x O/ZnCo 2 O 4 . The following research confirms the outstanding properties of the sensor for toluene is the result of the combined catalytic activity of the sensing layer, the reaction rate, and the structural properties of the sensing material. This synthesis pathway affords the synergistic exploitation of the merits inherent in ZnO and ZnCo 2 O 4 for gas sensing, ultimately facilitating the detection of toluene. The findings of this study furnish an approach for fabricating well-structured Co-Zn-O materials, thereby furnishing pragmatic insights for developing toluene detection systems.
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RSC Advances
·
2025
·Vol. 15
·期 33
·26950-26958
·
IF 4.6
Chunqiu Zhao,Qiang Chang,Fu Yin,Jing Li,Guowei Niu,Hulin Wang,Dan Liu,Bhekie B. Mamba,Chenghua Zhang,Alex T. Kuvarega
One-step CO hydrogenation to value-added chemicals represents a prominent yet challenging research objective for conventional catalysis processes in chemical industry. Herein, we report a rationally designed Ni-doped Zn-NC catalyst embedded within an N-doped carbon matrix for one-step CO hydrogenation to dimethyl ether (DME), demonstrating superior CO conversion compared to the pristine Zn-NC catalyst (25.9% vs. 20.6%) while both maintaining high DME selectivity (>93%). Structural characterization revealed that Ni atoms existed in a bimetallic coordination environment, which is crucial for the promoting effect of Ni. In contrast, Ni nanoparticles incorporated into Zn-NC (nanoNi–Zn-NC) reduced CO conversion to less than 17% despite retaining high DME selectivity (>92%). Besides, control catalysts containing either Ni-only or Ni/Zn nanoparticles supported on carbon support exhibited limited catalytic activity and mainly produced hydrocarbons. This work provides valuable insights into the active sites of the bimetallic Ni–Zn-NC catalysts and elucidate the structural effects of bimetallic systems for CO conversion to DME. Furthermore, this study offers a feasible framework for optimizing Zn-based bimetallic catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Kang Zhao,Shikai Ma,Jianan Zhao,Hongfei Li,Chuanzhen Ma,Jinhu Sheng,Junwei Ding,Heng Wang,Hewei Luo,Shide Wu,Shiwen Wang,Shaoming Fang
Aqueous zinc ion batteries have attracted considerable interest because of their affordability and enhanced safety features. However, several key challenges like uncontrollable Zn dendrites, hydrogen evolution and corrosion side-reactions hinder their practical application. Herein, carboxymethyl chitosan (CMCS), a cost-effective zwitterionic electrolyte additive, is proposed to stabilize the Zn anodes. The concurrently owned NH 3 + cations and COO − anions endow the CMCS molecule with a preferential adsorption ability, achieving reversible adsorption on the anode/electrolyte interface driven by the electric field, thereby leading to uniform and dendrite-free Zn deposition. Additionally, the adsorption layer of CMCS molecule is beneficial for effective water molecule repelling and side-reaction suppression. Consequently, an optimized 0.3 g L −1 CMCS additive actualizes extended lifespan of 800 h in the symmetric Zn//Zn cells at the test condition of 1 mA cm −2 , 1 mAh cm −2 . An average Coulombic efficiency of 98.75 % is achieved, which is much superior to the case in the benchmark ZnSO 4 electrolyte. To illustrate the feasibility of the CMCS-contained electrolyte, Zn//VO 2 full batteries were assembled and exhibits enhanced electrochemical performance. This study highlights the zwitterionic polymer as a versatile platform for advancing electrolyte design, paving the way for practical next-generation energy storage.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Rashida Shahbaz,Tianyou Li,Yongchao Sun,Samrina Sharif,Gaohong He,Canghai Ma
Mixed matrix membranes (MMMs) have emerged as promising materials for hydrogen separation, combining the processability of polymers with enhanced permeability and selectivity offered by inorganic fillers. However, challenges such as filler aggregation and poor polymer-filler interfacial compatibility limit their performance. In this study, amino-modified bimetallic ZIF (Zn/Co-ZIF-NH 2 ) was synthesized and employed as a novel nanofiller to fabricate 6FDA-DAM-based MMMs, aiming to improve interfacial compatibility between the filler and the polymer matrix. The incorporation of Co 2+ ions into ZIF-8-NH 2 introduced a synergistic effect, optimizing the balance between the rigidity and flexibility of metal-to-ligand bond linkage, while amino groups promoted robust interfacial interactions with the polymer matrix. Compared to the pure polymeric membrane, the MMMs incorporating 40 wt% MOF exhibited a significant enhancement in gas permeability, with H 2 permeability rising from 750 to 3273 Barrer and CO 2 permeability increasing from 840 to 2733 Barrer, corresponding to improvements of 336.4 % and 225 %, respectively. Simultaneously, H 2 /CH 4 and CO 2 /CH 4 selectivities increased to 33.7 and 28.1, representing improvements of 88.3 % and 41 % over the pristine polymer. These performance metrics exceed the 2008 Robeson upper bounds, demonstrating the effectiveness of Zn/Co-ZIF-NH 2 nanofillers in overcoming the permeability–selectivity trade-off. This study underscores the effectiveness of amino-modified bimetallic MOFs as advanced fillers for high-performance MMMs, particularly suited for hydrogen purification and CO 2 separation applications.
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Industrial Chemistry & Materials
·
2025
·
IF 11.9
Shenzhen Cong,Si Sun,YiJing Zhang,Ming Wang,Zhehua Jia,Jiaoyu Peng,Huan Pang
Metal-organic framework (MOF) membranes have received widespread research attention as a novel membrane material for H2/CO2 separation. The preparation of MOF membranes can be extended by constructing MOF membranes with homogeneous heterogeneous structure and the MOF membranes with high permeance and high selectivity can be prepared. Here, we use the chelation-assisted interfacial growth process to construct a seeding layer, and then prepare Co-Zn-ZIF-L membranes with homogeneous heterogeneous structure by secondary growth for the efficient separation of H2/CO2. The resulting Co-Zn-ZIF-L membranes show an H2 permeances of 2156 GPU and the H2/CO2 selectivity of 31.6 at 298K and 1.0 bar, surpassing the Robeson upper bond (2008). Furthermore, the Co-Zn-ZIF-L membrane has a H2/CO2 separation stability of 65 h and can efficiently separate to obtain pure H2.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Waner Hou,Xun Lei,Zhimin Liu,Xuanxuan Hao,Jintao Cheng,Yaxin Li,Leqian Hu,Peng Li
Herein, ZnCo bimetallic zeolite imidazole framework (ZnCo-ZIF) nanocubes were synthesized and used as 2e − oxygen reduction reaction (2e-ORR) electrocatalysts. ZnCo-ZIFs showed excellent ORR catalytic activity, which was benefit for producing reactive oxygen species (ROS) efficiently and enhancing the electrochemiluminescence (ECL) emission from luminol/H 2 O 2 system. The reaction mechanism investigation implied that ORR reaction could produce ROS, and the ECL response exhibited a positive correlation with the catalytic activity of ZnCo-ZIFs promoter. In addition, the electrocatalytic activity of different Zn/Co molar ratio (1/ 9, 1/5, 1 /1, 5/1 and 9/1) were investigated, the results showed that ZnCo-ZIF-IV with Zn/Co molar ratio of 5/1 displayed the highest ORR electrocatalytic performance, and the onset potential, H 2 O 2 production rate, the faraday efficiency were 0.67 V (vs. RHE), 67.17 % and 50.74 %, respectively. Finally, an ECL immunosensor based on the promoting effect of ZnCo-ZIF-IV nanocubes on the luminol/H 2 O 2 ECL system was proposed for the sensitive zearalenone assay. This strategy offers a new way to study the luminol-cathodic ECL system.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Lei Zhou,Yating Wu,Yangyang Xie,Jian Li,Xuxia Zhang,Kejia Liu,Hui Zhang,Tao Qi
The development of large-scale grid storage systems has increased interest in redox flow batteries due to their flexible design characteristics, which can help overcome the intermittency of renewable energy. Zn-Ce redox flow battery is considered as one of the most promising redox flow batteries due to its high voltage and low cost. However, using Zn metal anodes in this context remains problematic due to issues with corrosion and dendrite growth, as well as electrolyte incompatibility, which limits their cycling performance and practical application. Herein, an indium-based protective layer is constructed on the Zn anode cooperating with a dual-membrane cell configuration to solve these problems. Due to its unique physical and chemical properties, the zincophilic indium protective layer can effectively prevent electrolyte corrosion as well as regulate the behavior of Zn plating and stripping. Moreover, a dual-membrane cell configuration is used to mitigate electrolyte incompatibility since it uses specified ions as charge carriers and blocks the infamous H + poisoning on the zinc side. The cell exhibits a high discharge voltage plateau of 2.2 V at 20 mA cm −2 and maintains a high average energy efficiency of 84.39 % over 80 cycles. This work presents a practical method to enhance the cycling performance of the Zn-Ce battery by incorporating an In-based protective layer with a dual-membrane cell configuration, resulting in unparalleled efficiency and stability.
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