ACS Applied Energy Materials
·
2023
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IF 6.4
Junzhi Liao,Mengyao Xue,Yuankang Bao,Zhengtao Wu,Hao Zhang,Ping Li,Xun Xu,Shuwang Duo
The practical application of NiFe-based materials as high-performance water splitting electrocatalysts is severity restricted by their inferior hydrogen evolution reaction (HER) activity and long-term stability under large current density. Herein, we report a three-dimensional core–shell Ni/NiFe-layered double hydroxide (LDH) Schottky heterojunction on iron foam (Ni/NiFe-LDH/IF) electrode, in which a Ni metal nano-layer was directly deposited on the NiFe-LDH support grown in situ on commercial IF. Such an assembly enhanced the interfacial strength of the Ni/NiFe-LDH/IF electrode, promoted electron transfer and increased the adsorption energy of OH– as proved by density functional theory calculations. Consequently, the ultralow overpotentials (η) of 56 and 277 mV for HER and 140 and 330 mV for the oxygen evolution reaction (OER) resulted in the current densities of 10 and 1000 mA cm–2, respectively. The fabricated Ni/NiFe-LDH/IF two-electrode electrolyzer exhibited excellent water splitting characteristics, which produced the current densities of 10 and 1000 mA cm–2 at cell voltage of only 1.49 and 1.87 V, versus a reversible hydrogen electrode, respectively, which exceeded that of a commercial Pt/C||RuO2 catalyst. Moreover, the Ni/NiFe-LDH/IF electrolyzer demonstrated extremely high stability at 1000 mA cm–2 without a significant decay for more than 1500 h in a 1 M KOH solution and for 250 h at 60 °C in a 6 M KOH solution. This study proposes a scalable and extendable strategy for designing highly efficient and ultrastable electrocatalysts for hydrogen production at an ampere-level current density.
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Catalysis Science & Technology
·
2023
·Vol. 14
·期 1
·110-118
·
IF 5
Zi-Ye Liu,Qian-Yu Wang,Ji-Ming Hu
Modified NiFe-layered double hydroxide (NiFe LDH) materials with a high oxygen evolution reaction (OER) performance make it possible to replace noble metal catalysts for widespread applications. Herein, we prepare a layered carbon dot (CD) composite catalyst (denoted as NiFe LDH@CDs) by a one-step coprecipitation method without heating or hydrothermal treatment. Due to the numerous functional groups of CDs, there were strong electron interactions between the two components. The CDs promoted rapid charge transfers and accelerated OER kinetics. Moreover, through binding with the CDs, the NiFe LDH@CDs formed a heterojunction structure, which could efficiently suppress photoelectron–hole recombination. Based on the beneficial factors, the Tafel slope of NiFe LDH@CDs-200 was 44.77 mV dec−1, which further decreased to 38.44 mV dec−1 under light even with a low content of CDs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Ming-Dan Yao,Qi Liu,Zhe Feng,Ji Cai-Rang,Zi-Long Yang,Yu-long Xie
The heterostructure enhances the stability and activity of the catalyst. • The interfacial electron transfer and slight reconstruction synergistically enhance the catalyst performance. • d-p orbital hybridization enhances the metal synergy. • The formation of the heterojunction alters the rate-determining step of the reaction. This paper reports on a Ni 3 S 2 /NiFe-LDH heterostructure grown in-situ on a nickel foam substrate via a one-step hydrothermal method, and systematically evaluates its oxygen evolution reaction performance. This catalyst requires an overpotential of only 284 mV to reach a current density of 300 mA·cm −2 . Benefiting from the construction of the heterointerface, following 100 h galvanostatic electrolysis at 50 mA cm −2 , merely a 12 mV increase in overpotential was detected at 300 mA cm −2 in post-stability LSV tests. In-depth mechanistic analysis reveals that the introduction of Ni 3 S 2 triggers interfacial electronic reconstruction. Spin polarization and orbital hybridization collectively optimize the density of states of NiFe-LDH, accelerate charge transfer, and enhances its intrinsic catalytic kinetics. This work not only develops a high-performance oxygen evolution catalyst, but also provides a rational strategy for modulating electronic structures via heterointerface engineering to enhance electrocatalytic performance. Download: Download high-res image (328KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaoyu Lu,Congling Li,Li Zhang,Wei Xia,Rui Liu,Aifeng Lv
The rational design of efficient, cost-effective, and durable electrocatalysts is crucial for the realization of hydrogen production through water splitting. The present study describes the synthesis of a novel three-dimensional (3D) volcano-like Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF (Layered Double Hydroxides/Nickel Foam) electrocatalyst with a highly wrinkled structure through a two-step hydrothermal method. The as-synthesized electrocatalyst exhibits an exceptionally low overpotential of 77 mV for the hydrogen evolution reaction (HER) and 131 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm −2 , owing to the unique morphology and strong electronic interactions between Fe 3 S 4 , Ni 3 S 2 and WO 3 heterostructures. The Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF electrocatalyst demonstrates exceptional performance in overall water splitting when employed as both anode and cathode, achieving a current density of 10 mA cm −2 at an impressively low cell voltage of 1.5 V as well as exhibiting remarkable durability with little degradation over a period of 12 hours. This study presents a straightforward approach for the synthesis of highly efficient and durable non-noble metal catalysts for overall water splitting under hydrothermal conditions.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mengru Liu,Taotao Zhe,Fan Li,Limin Zhu,Shaohui Ouyang,Li Wang
The excessive use of nitrofurantoin (NFT) represents a threat to ecosystems and food safety, making it necessary to develop efficient and accurate detection methods. Herein, the Ru/NiFe-LDH-MXene/SPCE electrode was successfully synthesized by one-step electrodeposition and employed to the NFT electrochemical sensing. Combining 2D MXenes with multifunctional 2D layered double hydroxides (LDHs) creates synergistic interactions within the MXene-LDH heterostructures, modifying the electrochemical performance. Furthermore, the incorporation of noble metal nanoparticles and nanoclusters can significantly enhance electrochemical performance by promoting favorable interactions at the metal-carrier interface and optimizing the rearrangement of electronic structure. Based on this, the developed Ru/NiFe-LDH-MXene/SPCE sensor demonstrates remarkable sensitivity (152.44 μA μM −1 cm −2 ) and an ultralow detection limit (2.2 nM). Notably, the sensor was employed for NFT detection in food samples with satisfactory recoveries, making it a promising electrochemical sensor for the detection of NFT.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Danni Li,Xiang Shao,Mushtaq Muhammad Umair,Fubin Hou,Sa Li,Yingming Tang,Limei Cao,Ji Yang
Efficient non-precious metal electrocatalysts are crucial for hydrogen production through water electrolysis . Combining a superhydrophilic electrocatalyst with oxygen vacancy and a conductive carbon matrix is significant for NiFe LDH-based oxygen evolution reaction (OER) applications. In this study, NiFe LDH nanoflowers and Co-doped NiFe LDH nanoneedles were synthesized on graphite felt through an in-situ self-assembly strategy. Further results have shown that doping Co into NiFe LDH nanoarrays significantly enhances the specific surface area and oxygen vacancy density, while the graphite felt serves as a conductive scaffold and prevents active sites detachment. Oxygen vacancies in Co 3 –Ni 7 Fe 3 LDH/TGF adjust the electronic configuration, and superhydrophilicity promotes effective electrolyte diffusion. This synergy endows Co 3 –Ni 7 Fe 3 LDH/TGF with excellent OER performance, lower overpotential of 252 mV (10 mA cm −2 ), a Tafel slope (63.13 mV), and stability at high current densities . This research provides a new perspective for utilizing non-precious metal catalysts on carbon substrates for hydrogen production .
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Materials Today Physics
·
2024
·
IF 10
Qian Liu,Jinyi Wang,Yuxia Zhang,Wa Gao,Longhao Cui,Jingxiang Low,Haiming Zhang
Multi-physical fields driven catalysis for energy conversion has attracted increasing research interests. Introducing solar energy to boost the oxygen evolution reaction (OER) activity of electrocatalyst via photothermal effect is an effective way to reduce energy consumption of water electrolysis. However, it still remains challenging to design advanced catalyst that can fully utilize the energy of each physical field to promote the kinetically sluggish OER. Herein, we report a two-dimensional (2D)/2D heterostructure constructed by integrating the reduced graphene oxide (rGO) with high photothermal conversion efficiency on the surface of catalytically active nickel-iron layered bimetallic hydroxide (NiFe-LDH) nanosheet arrays. The 2D/2D heterointerface in rGO/NiFe-LDH enables the intense contact between rGO and NiFe-LDH, facilitating the generated local heat transfer and significantly reducing the overpotential towards OER under solar irradiation. The temperature of rGO/NiFe-LDH composite supported on carbon paper (rGO/NiFe-LDH/CP) rises rapidly from 30.0 °C to 58.5 °C after exposure to one-sun irradiation. Remarkably, the rGO/NiFe-LDH/CP exhibits a low overpotential of 197 mV to achieve the current density of 10 mA cm −2 for OER under solar irradiation. Furthermore, the Tafel slope of rGO/NiFe-LDH/CP decreases from 63.4 to 51.5 mV dec −1 with light irradiation, suggesting the integrated rGO photothermal layer not only reduce the thermodynamic barrier of OER but also accelerate the OER kinetics. In addition, the rGO can accelerate the charge transfer at the catalyst surface and increase the electrochemical specific surface area, all of which contributes to the enhanced electrocatalytic activity for OER. The solar-boosted electrocatalysis towards OER also shows good stability, indicating opportunities for practical application.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Chao Wang,Luna Chen,Xinyue Xu,Yajie Liu,Yiao Song,Lingbo Zong,Xingwei Li,Guanjun Chen,Tianrong Zhan
Oxygen vacancy can significantly improve the intrinsic activities of electrocatalysts towards oxygen evolution reaction (OER). Besides, the 3D hierarchical structure can release more active sites and optimize the adsorption/desorption energy of ∗OOH, ∗O, and ∗OH intermediates during the electrocatalytic process. In this study, the 3D heterostructure of NiFe-layered double hydroxides@etched Prussian blue analogue (NiFe-LDH@E-PBA) is prepared on nickel foam by electrodeposition and alkali etching processes. The alkali etching and the electrodeposition endow NiFe-LDH@E-PBA with abundant oxygen vacancies and plentiful active sites. The synergistic effect between NiFe-LDH and E-PBA offers efficient charge and mass transfer. Density functional theory calculations reveal that the interfacial electron transfer is conducive to the adsorption of OER intermediates. Hence, the catalyst displays outstanding electrocatalytic OER performance with a low overpotential of 263 mV at 100 mA cm −2 , a small Tafel slope of 34.78 mV dec −1 , and robust durability with a stable operation over 50 h at 100 mA cm −2 . NiFe-LDH@E-PBA also demonstrates excellent alkaline overall water-splitting performance by acting as both the anode and the cathode. The cell voltages at current densities of 10 and 100 mA cm −2 are 1.65 and 1.80 V, respectively. This work offers a novel approach for the fabrication of a 3D heterostructure with rich vacancies to enhance the electrocatalytic activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Changhui Liang,Yuxin Zhang,Jun Shen,Xiaoqiang Zhang,Huixiang Li,Songhai Xie,Yongxin Li,Z. Conrad Zhang
The development of bifunctional electrocatalysts with high efficiency for overall water splitting is still a challenging task. In this work, we introduce a novel one-step synthesis method for Pt/NiFe layered double hydroxide (LDH) on an iron-nickel foam (INF) substrate under mild conditions. This method eliminates the need for additional Ni or Fe ions and facilitates in-situ etching and growth processes under mild conditions, resulting in a higher active surface area, well-dispersed low-loading Pt nanoparticles, and a self-supported electrode without binders. These features collectively enhance electron transfer and catalytic activity for both HER and OER. The Pt/NiFe LDH/INF exhibits remarkable water splitting performance, requiring a cell voltage of only 1.44 V at10 mA cm −2 when used as both anode and cathode. Additionally, it remains stable at 20 mA cm −2 for at least 16 h. The exceptional water splitting activity of Pt/NiFe LDH/INF in alkaline solution can be attributed to the synergistic effects of Pt and NiFe LDH, which improve the hydrogen evolution reaction and oxygen evolution reaction efficiencies. The results provide valuable insights into designing bifunctional electrocatalysts with low Pt loading for optimal water splitting performance at low operating cost.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xin Li,Yue Dong,Zhixin Dai,Luyao Zhang,Bohan An,Ning Li,Yangqin Gao,Lei Ge
Anion exchange membrane water electrolysis (AEMWE) is regarded as a highly promising technology for industrial hydrogen production. The development of efficient and stable anodic oxygen evolution reaction (OER) catalysts is crucial for advancing this technology. In this work, a heterojunction catalyst was constructed by means of the vertical anchoring of NiFe LDH onto larger CoFeP nanosheets. This heterojunction structure modulates the electronic structure, thereby enhancing conductivity and optimizing the efficiency of adsorption/desorption of reaction intermediates. Furthermore, the hierarchical nanosheet morphology facilitates bubble detachment and exposes more active sites, collectively enhancing the electrocatalytic activity. The CoFeP@NiFe LDH electrode requires an overpotential of only 268 mV to achieve a current density of 100 mA cm −2 and maintains stability for 100 h, demonstrating superior performance to most reported NiFe LDH catalysts. When employed in an anion exchange membrane (AEM) electrolyzer with PtC as the cathode, the CoFeP@NiFe LDH anode achieved a current density of 1.0 A cm −2 at a cell voltage of just 1.67 V, significantly outperforming the benchmark RuO 2 || PtC system. This work provides a practical strategy for designing high-performance anodic catalysts for advanced AEMWE systems.
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CRYSTENGCOMM
·
2023
·
IF 3.1
Yujie Jia,Shuhan Jiang,Qianchen Ou,Yanan Liu,Jian Zhang,Yangjie Zhou,Yuan Lian,Hongmei Wang
NiFe-LDH/g-C3N4 (LDH/CN) heterostructures with different amounts of NiFe-LDH (LDH) were prepared by a hydrothermal method and characterized using different experimental techniques. Their photocatalytic properties were investigated using the degradation of tetracycline hydrochloride (TC) and the production of hydrogen from water splitting. Experimental results showed that the hydrogen production rate (780.5 μmol g−1 h−1) was 2.29 times that of pristine CN, and the TC removal rate (76.3%) of 1.8LDH/CN was 3.71 times that of CN. According to the detailed study of the structural, optical, and photoelectrochemical properties, a type II charge transfer mechanism was proposed to explain the improved photocatalytic performance of LDH/CN.
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Energy & Environmental Materials
·
2026
·
IF 13.8
Zhe Sun,Jianye Wang,Zengxuan Chen,Huashuo Zhang,Siyuan Liu,Bo Liao,Zhaojie Wang,Xiaoqing Lu
The development of efficient and stable oxygen evolution reaction (OER) electrocatalysts is crucial for sustainable hydrogen production through water splitting. Though NiFe-layered double hydroxide (NiFe-LDH) represents a promising non-precious catalyst, its practical application is hindered by rapid degradation under operation due to metal leaching and sluggish kinetics. Bridged-linked structures were synthesized using a hydrothermal method. Inspired by the amino acids in photosystem II (PSII), we reported an organic–inorganic hybrid electrocatalyst of NiFe-LDH coupled with 4-chlorobenzoic acid (CA) that synchronously enhances OER activity and stability. The bidentate CA ligand bridges adjacent LDH layers via Fe-O-C and Fe-Cl-C bonds, modulating the electronic structure of metal centers and facilitating proton-coupled electron transfer. The resulting NiFe-LDH-CA exhibits an ultralow overpotential of 213 mV at 10 mA cm −2 , and remarkable stability over 550 h at 500 mA cm −2 in alkaline medium. It can also operate stably for 120 h under industrial conditions, experiencing virtually no performance degradation. In situ Raman spectroscopy and pH-dependent studies reveal that the anchored CA acts as a dynamic proton-transfer relay, facilitating concerted proton-electron transfer during OER. DFT calculations further confirm the reduced energy barrier of the rate-determining steps and promote the reaction kinetics. Additionally, the introduction of Fe-O-C/Fe-Cl-C bridge structure prevents the Fe species from dissolution during OER, thereby enhancing the stability of the catalyst. This work offers valuable insights for designing high-performance catalysts with bio-inspired proton-management functionality.
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