INORGANIC CHEMISTRY
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2023
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IF 4.6
Zihao Chen,Senjie Dong,Minghui Wang,Zunpeng Hu,Huiling Chen,Ye Han,Ding Yuan
Constructing three-dimensional (3D) hierarchical heterostructures is an appealing but challenging strategy to improve the performance of catalysts for electrical energy devices. Here, an efficient and robust flexible self-supporting catalyst, interface coupling of ultrathin CoFe-LDH nanosheets and Co3O4 nanowire arrays on the carbon cloth (CC/Co3O4@CoFe-LDH), was proposed for boosting oxygen evolution reaction (OER) in rechargeable liquid/solid Zn–air batteries (ZABs). The strong interfacial interaction between the CoFe-LDH and Co3O4 heterostructures stimulated the charge redistribution in their coupling regions, which improved the electron conductivity and optimized the adsorption free energy of OER intermediates, ultimately boosting the intrinsic OER performance. Besides, the 3D hierarchical nanoarray structure facilitated the exposure of catalytically active centers and rapid electron/mass transfer during the OER process. As such, the CC/Co3O4@CoFe-LDH catalyst achieved excellent OER catalytic activity in alkaline medium, with a small overpotential of 237 mV at 10 mA cm–2, a low Tafel slope of 35.43 mV dec–1, and long-term durability of up to 48 h, significantly outperforming the commercial RuO2 catalyst. More impressively, the liquid and flexible solid-state ZABs assembled by the CC/Co3O4@CoFe-LDH hybrid catalyst as the OER catalyst presented a stable open circuit voltage, large power density, superb cycling life, and satisfactory flexibility, indicating great potential applications in energy technology. This work provides a good guidance for the development of advanced electrocatalysts with heterostructures and an in-depth understanding of electronic modulation at the heterogeneous interface.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 7
·688
·
IF 4.501
Guolei Xiao,Weibin Chen,Yaming Cai,Shifan Zhang,Di Wang,Dandan Cai
Layered double hydroxide (LDH) has emerged as a promising electrocatalyst; however, the synthetic method usually requires high temperature and high pressure, and sulfate-intercalated LDH is rarely reported. Herein, the sulfate-intercalated CoFe LDH nanosheets were successfully fabricated at ambient temperature via a facile strategy, using two-dimensional ZIF-9(III) as a template and FeSO4as both etchant and iron source. When the as-prepared sulfate-intercalated CoFe LDH acts as an electrocatalyst, it presents superior electrocatalytic performance for the oxygen evolution reaction (OER), requiring low overpotential (η@10 mA cm−2= 218 mV) with a small Tafel slope of 59.9 mV dec−1in 1.0 M KOH, which compares favorably with commercial RuO2and most reported transition-metal electrocatalysts. The high catalytic activity of CoFe LDH might be ascribed to the large interlayer space distance originating from special SO42−ions and the strong synergistic effects between Fe and Co. This work provides a novel and feasible approach to designing highly efficient electrocatalysts based on advanced LDH materials for OER.Keywords:facile synthesis;sulfate-intercalated CoFe LDH;two-dimensional ZIF-9(III);electrocatalysts;oxygen evolution reaction
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Siraj Ullah,Waqas Ahmed,Shuozhen Hu,Xinsheng Zhang
Electrochemical water splitting is a potential method for sustainable hydrogen production. Achieving efficient and durable bifunctional electrocatalysts for alkaline water splitting remains challenging due to sluggish OER/HER kinetics and a reliance on noble metals. Here, we introduce MX-CoFe/EMN, a binder-free hybrid electrocatalyst fabricated by sequential electrodeposition of Ti 3 C 2 T x MXene integrated CoFe layered double hydroxide (LDH) nanosheets onto nickel foam. Combining CoFe LDH with MXene, which serves as both conductive scaffold and active component, yields beneficial interfacial electronic interactions, enhanced charge transfer, and a high density of active sites. In 1.0 M KOH, MX-CoFe/EMN shows low overpotentials of 260 mV (OER) and 279 mV (HER) at ±100 mA cm −2 , small Tafel slopes 39 mV dec −1 (OER), 68 mV dec −1 (HER), and excellent durability of over 80 h at ±500 mA cm −2 . These findings demonstrate a scalable electrodepositin-based approach for developing highly active and durable non-noble-metal electrocatalysts for sustainable hydrogen generation.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
Magnetic and recyclable calcined CoFe-LDH/g-C 3 N 4 catalyst was prepared by co-precipitation and calcination method, and used as a multifunctional material to remove hexavalent chromium (VI) via the synergistic effect of adsorption and photocatalysis. The calcined CoFe-LDH provide surface adsorption in the composite, which could lead to the adsorption of Cr (VI) with high adsorption capacity and fast speed. The g-C 3 N 4 nanosheets have high photocatalytic activity in situ for the composite to reduce Cr (VI) into Cr (III). The results demonstrated that 60% Cr (VI) (50 mg L −1 ) can be adsorbed by the nanocomposite in 10 min and the removal efficiency of Cr (VI) reached 100% in 90 min under visible light irradiation by adsorption and photocatalysis. In addition, the calcined CoFe-LDH/g-C 3 N 4 exhibits a mostly pore size about 2.58 nm, large specific surface area (101.61 m 2 g −1 ) with the high structural stability and saturation magnetization (23.06 emu g −1 ), hence, could be easily recycled for ten subsequent runs with little activity loss.
研究领域:
环境科学
·
材料科学
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Polymers
·
2023
·Vol. 15
·期 3
·734
·
IF 5
Jinliang Ma,Longlong Liu,Zihao Chen,Minghui Wang,Han Wu,Hongmiao Wang,Ding Yuan,Xin Ning
Exploring high-efficiency, low-cost, and long-life bifunctional self-supporting electrocatalysts is of great significance for the practical application of advanced rechargeable Zn-air batteries (ZABs), especially flexible solid-state ZABs. Herein, ultrathin CoFe-layered double hydroxide (CoFe-LDH) nanosheets are strongly coupled on the surface of leaf-like bimetallic metal-organic frameworks (MOFs)-derived hybrid carbon (Co@NC) nanoflake nanoarrays supported by carbon cloth (CC) via a facile and scalable method for rechargeable and flexible ZABs. This interfacial engineering for CoFe-LDHs on Co@NC improves the electronic conductivity of CoFe-LDH nanosheets as well as achieves the balance of oxygen evolution reduction (OER) and oxygen reduction reaction (ORR) activity. The unique three-dimensional (3D) open interconnected hierarchical structure facilitates the transport of substances during the electrochemical process while ensuring adequate exposure of OER/ORR active centers. When applied as an additive-free air cathode in rechargeable liquid ZABs, CC/Co@NC/CoFe-LDH-700 demonstrates high open-circuit potential of 1.47 V, maximum power density of 129.3 mW cm−2, and satisfactory specific capacity of 710.7 mAh g−1Zn. Further, the flexible all-solid-state ZAB assembled by CC/Co@NC/CoFe-LDH-700 displays gratifying mechanical flexibility and stable cycling performance over 40 h. More significantly, the series-connected flexible ZAB is further verified as a chain power supply for LED strips and performs well throughout the bending process, showing great application prospects in portable and wearable electronics. This work sheds new light on the design of high-performance self-supporting non-precious metal bifunctional electrocatalysts for OER/ORR and air cathodes for rechargeable ZABs.Keywords:carbon fiber;bifunctional electrocatalysts;bimetallic MOFs;self-supporting electrodes;Zn-air battery
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jyunhong Shen,Antong Shi,Jiahui Lu,Xiangtao Lu,Hongyu Zhang,Zhuwu Jiang
A novel magnetically separable Cu/ZnO/CoFe‒CLDH composite, whose synthesis was optimized using the Taguchi approach, was optimally synthesized by hydrothermally coupling Cu-doped ZnO and calcined CoFe–LDH. The synthesized Cu/ZnO/CoFe‒CLDH was applied to construct a synergistic process of integrating visible-light photocatalysis (VPC) with persulfate activation (PSA) and to degrade bisphenol A (BPA). Various characterizations proved that Cu/ZnO/CoFe‒CLDH possessed excellent physicochemical, optoelectronic and magnetic properties, thereby enhancing the catalytic performance. The Cu/ZnO/CoFe‒CLDH composite achieved highly efficient BPA degradation during the synergistic VPC‒PSA process, and its reaction rate constant (0.74 h −1 ) was 6.17-, 4.11-, and 2.85-fold higher than that of Cu/ZnO, CoFe‒CLDH, and Cu/ZnO/CoFe‒CLDH (VPC only), respectively. Moreover, the effects of the catalyst dosage, initial pollutant concentration , solution pH, persulfate dosage and coexisting ions on BPA degradation were comprehensively investigated. Radical-trapping experiments revealed that the contributions of ·OH, SO 4 · ‒ , ·O 2 − , and 1 O 2 involved in BPA degradation. Based on the intermediates identified by LC/MS, the main BPA degradation pathways were determined, the overall trend of which reflects a decreasing ecotoxicity. This study verified the effectiveness of the synergistic VPC‒PSA process with Cu/ZnO/CoFe‒CLDH, which could be used as a new reference for removing organic micropollutants from water.
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