APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xu Cai,Tongtong Jiang,Mingzai Wu
The sluggish oxygen evolution reaction (OER) and poor stability of oxygen electrocatalysts are main obstacles to the scale-up commercial application of rechargeable Zn-air battery. Herein, a three-dimensional (3D) multi-level architecture design is achieved by the confined growth of two-dimensional (2D) layer double hydroxides of nickel and iron (NiFe LDH) flakes on copper nanowires arrays (Cu NWs), which is epitaxially assembled on the surface of Cu foam (CF). The established Cu@Cu NW@LDH possesses stronger bonding strength between NiFe LDH and Cu NWs as well as Cu NWs and CF endowed by electroplating method. The introduction of Cu NWs not only provides abundant nucleation sites for the deposition of NiFe LDH flakes but also improves the electron conductivity of composite. The obtained Cu@Cu NW@LDH shows excellent OER catalytic activity with a potential of 1.44 V at a current density of 10 mA cm −2 and strong alkaline resistance properties in comparison with NiFe LDH on CF (Cu@LDH). As expected, the rechargeable zinc-air battery (ZAB) with Cu@Cu NW@LDH as air electrode delivers superior cycling stability (250 h at a current density of 10 mA cm −2 ). This work paves a new way to the design of 3D multi-level architecture catalysts for ZAB.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yi Ma,Luming Li,Yong Zhang,Ning Jian,Huiyan Pan,Jie Deng,Junshan Li
Electrochemical upgrading methanol into value-added formate at the anode in alkaline media enables the boosting production of hydrogen fuel at the cathode with saved energy. To achieve such a cost-effective and efficient electrocatalytic process, herein this work presents a Mn-doped nickel iron layered double hydroxides supported on nickel foam, derived from a simple hydrothermal synthesis. This developed electrocatalyst could act as an efficient bifunctional electrocatalyst for methanol-to-formate with a high faradaic efficiency of nearly 100 %, and for hydrogen evolution reaction, at an external potential of 1.5 V versus reversible hydrogen electrode. Additionally, a current density of 131.1 mA cm −2 with a decay of merely 12.2 % over 120 h continuous long-term testing was generated in co-electrocatalysis of water/methanol solution. Further density functional theoretical calculations were used to unravel the methanol-to-formate reaction mechanism arising from the doping of Fe and/or Mn. This work offers a good example of co-electrocatalysis to produce formate and green hydrogen fuel using a bifunctional electrocatalyst.
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ENERGY & FUELS
·
2024
·
IF 5.2
Jiongyu Chen,Zhi Liu,Yuchen Liu,Zhen Cheng,Jingze Zhang,Qinghong Zhang,Yaogang Li,Chengyi Hou,Kerui Li,Hongzhi Wang
Efficient and affordable electrocatalysts are a crucial part of rechargeable zinc air batteries (ZAB) to address the problems caused by the sluggish activity of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the cathode. Anchoring noble metals on transition-metal-based substances is a promising strategy to reinforce electrochemical activity and reduce the cost. Herein, we have developed a subsequent spontaneous-redox strategy to load Pt nanoparticles with 3.75% containing NiFe-LDH nanoflakes to boost the ORR activity. After that, NiFe-LDH@ Co9S8 is constructed as a rational design for bifunction catalysis. In the ORR process, the half-wave potential of the obtained catalyst, Pt-anchored NiFe-LDH@Co9S8, is 0.83 V vs RHE, showing better catalytic activity than Pt/C. In the OER process, the obtained catalyst exhibits a low overpotential of 280 mV, which is superior to that of RuO2. Notably, aqueous ZAB and quasi-solid-state ZAB achieve peak power densities of 164.3 and 78.4 mW cm–2, respectively. Furthermore, quasi-solid-state ZAB exhibits a long cycle lifespan for 240 cycles in 80 h, and a remarkable stability after bending for 50 cycles. This work paves the way for the design of the NiFe-LDH nanostructure by vacancy engineering.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shiwei Song,Yanhui Wang,Pengfei Tian,Jianbing Zang
The admire activity, selective and corrosion resistance electrocatalysts for oxygen evolution reaction (OER) are the bottleneck restricting seawater electrolysis owing to the side reactions of chloride ions (Cl − ). Herein, we developed a local amorphous S-modified NiFe-LDH ultrathin nanosheets with large spacing on NiFe foam (la-S-NiFe-LDH/NFF) in-situ via the fast H 2 O 2 assisted etching-anion regulation, resulting in a superior OER catalytic activity for seawater electrolysis. Benefitting from the local amorphous architecture induced by S, enhanced the metal–oxygen covalency, triggered lattice oxygen activity, and reduced the desorption energy of O 2 , the la-S-NiFe-LDH/NFF accelerated the OER progress via the lattice-oxygen-mediated (LOM) mechanism. Additionally, the preferential adsorbed OH – and reconstructed SO 4 2− cooperated to prevent the proximity and erosion of Cl − and enhanced the corrosion resistance for seawater electrolysis. The assembled electrolyzer of Pt/C || la-S-NiFe-LDH/NFF possessed an industrial level of 500 mA cm −2 at 1.83 V potential for seawater electrolysis, and sustained response for 100 h.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xinchun Lu,Liguo Shen,Hongjun Lin,Lei Han,Jiarong Du,Cheng Chen,Jiaheng Teng,Bisheng Li,Wei Yu,Yanchao Xu
Efficient oil-water separation has always been a research hotspot in the field of environmental studies. Employing a one-step hydrothermal approach, NiFe-layered double hydroxides (LDH) nanosheets were synthesized on nickel foam substrates. The resulting NiFe-LDH/NF membrane exhibited rejection rates exceeding 99% across six diverse oil-water mixtures, concurrently demonstrating a remarkable ultra-high flux of 1.4 × 10 6 L·m −2 ·h −1 . This flux value significantly surpasses those documented in existing literature, maintaining stable performance over 1000 manual filtration cycles. These breakthroughs stem from the synergistic interplay among the three-dimensional channels of the nickel foam, the nanosheets, and the hydration layer. By leveraging the pore size of the foam to enhance the functionality of the hydration layer, the conventional trade-off between permeability and selectivity was transformed into a balanced force relationship between the hydration layer and the oil phase. The operational and failure mechanisms of the hydration layer were examined using the prepared NiFe-LDH/NF membrane, validating the correlation between oil phase viscosity and density with hydration layer rupture. Additionally, an extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was employed to investigate changes in interaction energy, further reinforcing the study's findings. This research contributes novel insights and assistance to the comprehension and application of hydration layers in other membrane studies dedicated to oil-water separation.
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Nanoscale
·
2025
·
IF 5.1
Xi-Song Gong,Xing Liu,Jian Zhou
The development of environmentally friendly, high-efficiency, stable, earth-abundant and non-precious metal-based electrocatalysts with fast kinetics and low overpotential for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of exceeding significance but still challenging. Herein, a bifunctional electrode of unique hierarchical NiFe-LDH/Ni/NiCo2S4/NF (NiFe-LDH = nickel–iron layered double hydroxide and NF = nickel foam) electrocatalytic architecture, which is built up from NiFe-LDH nanosheets, Ni nanoparticles and NiCo2S4 nanoneedles sequentially arrayed on a porous NF substrate, has been prepared by a facile hydrothermal and electrodeposition method. This electrocatalytic architecture is binder-free and its outer NiFe-LDH nanosheets can effectively prevent the oxidation of inner Ni nanoparticles and corrosion of NiCo2S4 nanoneedles during water electrolysis. The integration of effective HER Ni nanoparticles into OER NiFe-LDH and NiCo2S4 electrocatalysts can not only overcome the disadvantage of their poor electrical conductivity, but also greatly improve their HER and OER activities, owing to the unique hierarchical heterostructure and multicomponent synergies among Ni, NiFe-LDH, and NiCo2S4. Consequently, this electrode shows better OER performance with ultra-low overpotential of 192 mV at 10 mA cm−2, a small Tafel slope of only 37 mV dec−1 and high stability in comparison with commercial RuO2, and also exhibits excellent HER activity with a low overpotential of 83 mV at 10 mA cm−2. More importantly, the NiFe-LDH/Ni/NiCo2S4/NF composite serves as anode and cathode for overall water splitting, and it requires a low cell potential of only 1.53 V to reach a current density of 10 mA cm−2, which evidently exceeds that of the standard Pt–C/NF//RuO2/NF cell of 1.61 V. This work provides a feasible strategy to prepare high-efficiency, low-cost and non-precious metal-based electrocatalysts for overall water splitting.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Shuanghuan Gu,Sen Wang,Yongju Zhang,Zhixiang Xu,Longhua Xu
The development of sensitive and selective electrochemical sensors for antibiotic detection is critical to ensuring food safety. Herein, we report a novel biomimetic electrochemical sensor using a ternary AuNP/NiFe-LDH/MWCNT heterostructure combined with molecularly imprinted polymers (MIPs) for detecting enrofloxacin (ENR) in food. The AuNP/NiFe-LDH/MWCNT composite was prepared by in-situ reducing HAuCl 4 on a NiFe-LDH/MWCNT backbone, forming a heterojunction structure that enhances charge separation and electron transfer. Electropolymerization of pyrrole with ENR produced highly selective MIP layers. The synergistic integration of high conductivity, abundant catalytic sites, and selective molecular recognition endows the sensor with excellent electrochemical performance. The sensor exhibits a wide linear range (0.05–100.0 μM) and an ultralow limit of detection (LOD) 0.025 μM. It showed superior selectivity, reproducibility, stability, and applicability in complex aquatic food samples, with recoveries of 94.6 % to 103.9 %. This work paves the way for practical, high-precision monitoring of trace antibiotics in food safety applications.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Yaoxia Yang,Fuxing Zhou,Ruirui Zhang,Bolin Xiong,Zhen Yao,Dongfei Sun,Qingtao Wang,Zhiwang Yang
Hydrogen is the most suitable green energy for the current era, and electrolyzing water to produce hydrogen is the most efficient preparation method. The development of efficient oxygen evolution reaction (OER) electrocatalysts is crucial for sustainable energy conversion. In our work, we construct a hierarchical CNFS@NiFe-LDH/NF heterostructure by integrating ZIF-67-derived cobalt sulfide with nickel‑iron layered double hydroxide (LDH) and bimetallic sulfides on nickel foam (NF). This composite synergistically combines the high surface area and active sites from the MOF-derived sulfide, the tunable layered structure and abundant -OH groups from the LDH-which facilitate OH − adsorption and O O formation-as well as electronic modulation effects from the bimetallic sulfides. The catalyst exhibits excellent OER performance with an overpotential of 236 mV at 10 mA cm −2 and a Tafel slope of 42.23 mV dec −1 under alkaline conditions, and maintains high conductivity and low charge transfer resistance throughout operation. Meanwhile, the catalyst showed excellent stability for at least 66 h during the OER process at 50 mA cm −2 , which demonstrates outstanding durability. Moreover, this catalyst have satisfactory hydrophilicity/aerophobicity. This work provides an effective strategy for designing high-performance and stable electrocatalysts via heterogeneous interface engineering.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
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IF 5.2
Xingjian Dai,Dachong Gu,Quan Zhou,Xinfang Zhang,Chenzhi Zhang,Tao Sun,Xiaoying Liu,Dan Song,Lihong Gao,Jishu Zheng,Jinsong Rao,Yuxin Zhang
The integration of multiple degradation pathways in a single catalyst has been proposed as a promising strategy for environmental remediation. The successful transition process from MnO 2 to alpha-Fe 2 O 3 is used to prepare 1D/2D/3D alpha-Fe 2 O 3 @NiFe LDH@diatomite (FENFD) nanocomposite for improving conversion efficiency during pollutant degradation. The effects of initial pH, pollutant concentration, persulfate (PS) dosage, and catalyst dosage on the degradation rate were systematically investigated. FENFD demonstrated favorable PS activation performance and high degradation efficiency for Rhodamine B , azo dyes , and tetracycline over a broad pH range. Comparative experiments with quenching catalytically active radicals and analysis of electron spin resonance (ESR) spectra reveal that the sulfate radical generated by PS photocatalytic activation has a synergistic effect with superoxide radical and hydroxyl radical to degrade pollutants. Biotemplate-diatomite effectively achieves the dispersion of magnetic nano Fe 2 O 3 and LDH and increases light utilization. Meanwhile, density functional theory (DFT) calculations demonstrate that the in situ grow Fe 2 O 3 @NiFe LDH heterojunctions can efficiently transform the interface band structure to inhibit the recombination of photogenerated electron-hole pairs. The stability and reusability of the magnetic nanocomposites were also evaluated, and the degradation efficiency reached 96.4% even after five cycles, which provides new insight into designing single catalysts with different degradation mechanisms.
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Chemical Science
·
2017
·Vol. 9
·期 5
·1375-1384
·
IF 8.668
Fang-Shuai Zhang,Jia-Wei Wang,Jun Luo,Rui-Rui Liu,Zhi-Ming Zhang,Chun-Ting He,Tong-Bu Lu
The development of highly efficient, low-cost and stable electrocatalysts for overall water splitting is highly desirable for the storage of intermittent solar energy and wind energy sources. Herein, we show for the first time that nickel can be extracted from NiFe-layered double hydroxide (NiFe-LDH) to generate an Ni2P@FePOx heterostructure. The Ni2P@FePOx heterostructure was converted to an Ni2P@NiFe hydroxide heterostructure (P-NiFe) during water splitting, which displays high electrocatalytic performance for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH solution, with an overpotential of 75 mV at 10 mA cm−2 for HER, and overpotentials of 205, 230 and 430 mV at 10, 100 and 1000 mA cm−2 for OER, respectively. Moreover, it could afford a stable current density of 10 mA cm−2 for overall water splitting at 1.51 V in 1.0 M KOH with long-term durability (100 h). This cell voltage is among the best reported values for bifunctional electrocatalysts. The results of theoretical calculations demonstrate that P-NiFe displays optimized adsorption energies for both HER and OER intermediates at the nickel active sites, thus dramatically enhancing its electrocatalytic activity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Jin Zhao,Tianxiang Jiang,Junrui Cao,Xuemin Feng,Xunliang Wang,Baolong Xie,Yuhui Ma,Huafeng Ren,Yu Cheng,Keyuan Zhang,Yutong Han,Xianghai Guo,Yizhong Zhang
Mild hydrothermal strategy well preserves abundant O/N functional groups of Chitosan-derived amorphous carbon. • Chitosan-derived amorphous carbon efficiently stabilizes intrinsic Ni 3+ active sites. • Pre‑stabilized intrinsic Ni 3+ promotes the reconstruction of γ‑NiOOH. • Interfacial electronic modulation lowers UOR overpotential and delivers remarkable UOR activity. Replacing the sluggish oxygen evolution reaction (OER) with the urea oxidation reaction (UOR) offers a promising route for energy-efficient hydrogen production and the electrochemical treatment of urea-containing wastewater. However, the practical application of UOR is still hindered by insufficient anode durability and sluggish UOR kinetics. Herein, biomass chitosan was employed as the carbon precursor to fabricate amorphous carbon-modified coral-like NiFe layered double hydroxide (NiFe-LDH), which was in-situ anchored on nickel foam via a facile one-step hydrothermal strategy. The optimized catalyst achieved remarkable UOR electrocatalysis, requiring only 0.94 V and 0.96 V overpotential to reach 50 mA·cm −2 and 100 mA·cm −2 , respectively, accompanied by a small Tafel slope of 22 mV·dec −1 and outstanding long-term stability exceeding 1000 h at 100 mA·cm −2 . Operando spectroscopic characterizations and density functional theory (DFT) calculations indicated that electron-withdrawing functional groups on chitosan-derived amorphous carbon induced interfacial electron transfer, which stabilized electron-deficient Ni 3+ sites. This pre-stabilized Ni 3+ facilitated the in-situ generation of active γ-NiOOH at low potential, while γ-NiOOH served as the catalytic phase to drive the UOR; the complementary synergy between the two significantly enhanced the overall catalytic performance. This study affords a versatile interfacial modulation protocol for designing high-performance crystalline/amorphous hybrid electrocatalysts, which may offer a promising route for sustainable energy conversion and the electrochemical treatment of urea-containing wastewater. Download: Download high-res image (213KB) Download: Download full-size image Electron-withdrawing O/N groups of chitosan-derived amorphous carbon tunes Ni and Fe 3d- t 2 g orbitals of NiFe-LDH via interfacial charge transfer, stabilizing intrinsic Ni 3+ and reducing UOR overpotential.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Danyang Liu,Miaomiao Jing,Qiang Zhao,Junli Wang,Zhifang Jia,Zuopeng Li,Kewei Wang,Yong Guo,Yuanzhen Ke
A novel S-scheme heterojunction N,S-NiFe-LDH/N-Bi₂MoO₆ was successfully constructed. • 5 wt% N,S-NiFe-LDH/N-Bi₂MoO₆ showed the highest activity, degrading 86.3% of TC in 100 min under visible light. • Element doping and interface engineering synergistically enhanced visible-light absorption and charge separation. • ·OH and ·O₂ − were the dominant active species responsible for TC degradation. A step-scheme (S-scheme) heterojunction photocatalyst was constructed via a hydrothermal method, consisting of N,S co-doped NiFe layered double hydroxide (N,S-NiFe-LDH) and nitrogen-doped bismuth molybdate (N-Bi₂MoO₆). The morphology, crystal structure, optical properties, elemental valence states, and charge separation/transport performance of the composite catalyst were systematically investigated using various characterization techniques, including SEM, TEM, HRTEM, XRD, UV–Vis DRS, XPS, and EIS. Its photocatalytic activity was evaluated through tetracycline (TC) degradation experiments under visible light irradiation, and the catalytic mechanism was elucidated by EPR radical detection. The results showed that the incorporation of N,S-NiFe-LDH enhanced the photocatalytic performance of the composite catalyst. Among the tested samples, the 5 wt% N,S-NiFe-LDH/N-Bi₂MoO₆ composite exhibited the highest degradation efficiency, achieving 86.3% TC removal within 100 min. The synergistic interaction between N,S-NiFe-LDH and N-Bi₂MoO₆ promoted the separation efficiency of electrons and holes, thereby significantly enhancing the photocatalytic activity.
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