APPLIED SURFACE SCIENCE
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2026
·
IF 6.6
Yuan Rui,Yong Liu,Fuqi Zheng,Zong Li,Miaohui Wang,Haiping Lin,Peipei Huang,Qing Li
Developing green hydrogen production via urea-assisted water splitting is of great importance for mitigating energy crisis and environmental concerns. However, accelerating the sluggish anodic reaction kinetics yet remains challenging. Herein, self-supported nickel cobalt layered double hydroxides (NiCo-LDH) with unsaturated coordination nickel sites were prepared via regulating the crystallinity by an electrodeposition method. The NiCo-LDH-50 homojunction with an optimal amorphous/crystalline ratio exhibits rapid urea oxidation reaction (UOR) kinetics with a low Tafel slope of 10.9 mV dec −1 . It requires only 1.18/1.29 V versus reversible hydrogen electrode to reach 10/100 mA cm −2 during UOR. Structural characterizations and theoretical calculations reveal that a moderate ratio of amorphous/crystalline interface not only exposes more unsaturated coordination nickel sites and accelerates the electron transfer, but also lowers the energy barrier of Ni 3+ /Ni 2+ transformation and promotes a more reversible catalytic cycle, thus leading to excellent UOR performance. When employed as the anode in a two-electrode urea electrolyzer, 1.29 V is required to achieve 10 mA cm −2 with an excellent stability. This work provides an effective approach for designing high-performance electrocatalysts for sustainable development of the energy and environment field.
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ChemCatChem
·
2023
·Vol. 15
·期 5
·e202201469
·
IF 4.5
Zhe Jia,Jiayin Shang,Kaijing Xue,Xi Yang,Sumin Wang,Changhua Xu,Qiguan Wang
Graphical High OER/ORR performances : boosted oxygen reduction reaction (ORR) as well as optimized oxygen evolution reaction (OER) and high-activity zinc-air batteries (ZAB), from a nitrogen-doped carbon nanomaterial (NCM) inserted Ni−Co layered double hydroxide (NiCo-LDH) electrocatalyst on nickel foam are achieved. The super thin NCM prepared by calcination of self-assembled perylenetetracarboxylic dianhydride/dicyandiamide improves the conductivity, electroactive surface area of NiCo-LDH nanoplates. Herein, a high performance bifunctional catalyst was prepared by inserting N-doped nanomaterials into Ni−Co layered dihydroxides (NiCo-LDH) nanoplates for high performance zinc-air battery. By using self-assembly of perylenetetracarboxylic dianhydride and dicyandiamide in the hydrothermal condition, a nitrogen-containing super thin carbonaceous nanosheet is achieved after calcination. Then NCM inserted NiCo-LDH nanoplates attached to nickel foam (NiCo-LDH/NCM@NF) are synthesized by in-situ production of NiCo-LDH species on NCM wrapped NF. The specific NCM improves the conductivity, electroactive surface area and the ORR/OER bifunctional activity of NiCo-LDH nanoplates. In addition, benefited from the formed rich oxygen vacancies, NiCo-LDH/NCM@NF delivers the low OER overpotential (352 mV at 50 mA cm −2 ) and boosted ORR performance with a half-wave potential of 0.765 V vs RHE. As the air cathode, the fabricated ZAB devices show a satisfactory capacity of 685 mAh g −1 and the energy density of 158 mW cm −2 .
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Nano Research
·
2022
·Vol. 16
·期 4
·4908-4916
·
IF 10.269
Ban Jinjin,Wen Xiaohan,Lei Honghong,Cao Guoqin,Liu Xinhong,Niu Chunyao,Shao Guosheng,Hu Junhua
Domain boundaries are regarded as the effective active sites for electrochemical energy storage materials due to defects enrichment therein. However, layered double hydroxides (LDHs) tend to grow into single crystalline nano sheets due to their unique two-dimentional (2D) lattice structure. Previously, much efforts were made on the designing hierarchical structure to provide more exposed electroactive sites as well as accelerate the mass transfer. Herein, we demonstrate a strategy to introduce low angle grain boundary (LAGB) in the flakes of Ni/Co layered double hydroxides (NiCo-LDHs). These defect-rich nano flakes were self-assembled into hydrangea-like spheres that further constructed hollow cage structure. Both the formation of hierarchical structure and grain boundaries are interpreted with the synergistic effect of Ni 2+ /Co 2+ ratio in an “etching-growth” process. The domain boundary defect also results in the preferential formation of oxygen vacancy (Vo). Additionally, density functional theory (DFT) calculation reveals that Co substitution is a critical factor for the formation of adjacent lattice defects, which contributes to the formation of domains boundary. The fabricated battery-type Faradaic NiCo-LDH-2 electrode material exhibits significantly enhanced specific capacitance of 899 C·g −1 at a current density of 1 A·g −1 . NiCo-LDH-2//AC asymmetric capacitor shows a maximum energy density of 101.1 Wh·kg −1 at the power density of 1.5 kW·kg −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shilin Fan,Bin Zhu,Yang Zhong,Shaoqi Shi,Jian Zhang,Chunlin Chen
Biomass upgrading offers a promising approach to reducing reliance on petroleum. Furthermore, integrating biomass conversion with hydrogen evolution reaction (HER) provides a means to simultaneously produce sustainable chemicals and energy. However, achieving industrial-scale current densities at lower potentials remains a significant challenge. Drawing inspiration from the Mott-Schottky heterojunction interface and its ability to modify energy levels, this work presents a novel core-skin structure Co@NiCo-LDH catalyst synthesized through in-situ growth and corrosion engineering. The designed catalyst demonstrated remarkable performance, requiring a potential of only 1.336 V to achieve 100 mA·cm −2 in 1 M KOH electrolyte containing 10 mM HMF, and 1.615 V to achieve 1000 mA·cm −2 in the presence of 100 mM HMF. Notably, the Co@NiCo-LDH exhibited exceptional structural and catalytic stability. Additionally, it displays excellent catalytic activity for both HMF electrooxidation and HER, with a H 2 production rate of 216.3 μmol·cm −2 ·h −1 in a two-electrode cell.
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RENEWABLE ENERGY
·
2024
·
IF 9
Ping Bai,Junyu Lang,Yinshu Wang,Haojie Tong,Zelin Wang,Bingbing Zhang,Yiguo Su,Zhanli Chai
Exploration of effective and renewable photocatalysts is essential for solar to hydrogen conversion technologies. However, the application of some photocatalysts with great potential, such as ZnCdS, are seriously limited by the sluggish charge transfer/separation and unavoidable light corrosion. In this work, Au/ZnCdS/NiCo-LDH ternary heterojunction was constructed by introducing Au nanoparticle mediator in core-shell ZnCdS/NiCo-LDH, which exhibits an enhanced H 2 production rate of 4.89 mmol g −1 h −1 under visible light irradiation and unexpected recyclability with 6.2 % rate reduction after 15 consecutive cycles. The enhanced photocatalytic performance is attributed to the dual pathways (Z-scheme and localized surface plasmon resonance) enabled in Au/ZnCdS/NiCo-LDH, which improves the separation of photo-generated carriers, accelerates the electron transport, and provides active sites for photocatalytic oxidation. This work provides a promising technology to jointly improve photocatalytic activity and stability by modulating the interfacial carrier dynamics of photocatalysts.
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Journal of Magnesium and Alloys
·
2025
·
IF 13.8
Zexuan Yang,Yazhou Wang,Xia Lin,Yongjin Zou,Cuili Xiang,Fen Xu,Lixian Sun,Yong Shen Chua
Magnesium-based hydrogen storage materials, such as MgH 2 , have attracted considerable attention because of its superior hydrogen storage capacities, inexpensive, and excellent reversibility. However, their high thermodynamic stabilities and slow kinetics lead to relatively high desorption temperatures, which severely limit the wide application of MgH 2 . In this study, the inclusion of vanadium induced the formation Ni-Co metal–organic frameworks (MOF) from a NiCo layered double hydroxide (LDH), thereby increasing the number of defects and vacancies, and improving the hydrogen storage properties of MgH 2 . The synthesized NiCo-MOF/V-O-doped MgH 2 system demonstrates excellent hydrogen storage capacity. More specifically, 5 wt.% of H 2 was released over 20 min at a relatively low dehydrogenation temperature of 250 °C, and almost complete dehydrogenation was achieved at 300 °C for 5 min. In addition, at 125 °C, the hydrogen storage material absorbed 5.5 wt.% H 2 in 10 min. Furthermore, the activation energy of dehydrogenation was determined to be 69.588 ± 6.302 kJ ·mol −1 which is significantly lower than that of the ball-milled MgH 2 (i.e., 118.649 ± 2.825 kJ ·mol −1 ). It was therefore inferred that during dehydrogenation process, a Mg 2 Ni/Mg 2 NiH 4 hydrogen pump is formed by Ni, while the V-H and Co-H bonds formed by Co and V during the reaction act synergistically to catalyze the absorption and desorption of hydrogen, thereby increasing the hydrogen storage capacity of MgH 2 . These experiments provide new perspectives on the commercial application of MgH 2 .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuyin Dai,Hongguang Zhao,Ri Sa,Qiuyu Lin,Yinghua Li
Enhancing the efficiency of layered nickel-cobalt double hydroxides (NiCo-LDH) as electrode materials represented a promising strategy for advancing supercapacitor technology and improving energy storage systems. However, achieving optimal synthesis conditions and addressing the inherent limitations of NiCo-LDH remained critical challenges. In this study, we developed a novel hydrothermal approach to fabricate ultrathin NiCo-LDH nanosheets with a highly porous architecture. In the present study, we have introduced a hydrothermal methodology aimed at the fabrication of ultrathin NiCo-LDH nanosheets characterized by an intricate and highly porous architecture. This innovative approach entailed the simultaneous deposition of nickel and cobalt hydroxides in the presence of ammonium fluoride, a technique that not only streamlined the synthesis process, but also markedly augmented the electrochemical performance of the resultant material. These effects collectively contributed to improved electron transport and structural stability. The optimized NiCo-LDH-18 electrode achieved an exceptional specific capacitance of 2266.6 F g⁻ 1 and an energy density of 104.8 W h kg⁻ 1 , with a remarkable 93.19 % capacitance retention after 40,000 cycles. Additionally, the potential window of the system closely approximated its theoretical maximum, reaching 96.88 % at a current density of 10 A g⁻ 1 . This refined synthesis strategy offered a significant advancement in supercapacitor performance and stability. By overcoming the inherent drawbacks of traditional supercapacitors, the developed materials provided an effective solution for meeting the growing demand for storage devices with high energy density.
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Journal of Energy Storage
·
2024
·
IF 8.9
Ye Qu,Yanzi Zhang,Yali Zhang,Jun Song,Zhaoen Liu,Weixing Rao,Yu Liu
The multi-component synergy of electrode materials and structural engineering are crucial for high-performance supercapacitors. Herein, a novel sandwich-like MXene@NiCo-layered double hydroxides (LDHs)/Co 9 S 8 nanostructure is rational synthesized, which with rich pores can significantly facilitate the diffusion of electrolyte ions and boost high charge transfer capability. Besides, the interaction forces between components promote the integration of multidimensional materials, and the resulting hybrid structure significantly improves the electrochemical efficiency through synergistic effects. Remarkably, the obtained MXene@NiCo-LDH/Co 9 S 8 composites exhibit a high specific capacitance of 808.0 F g −1 at a low current density of 1 A g −1 , the value is nearly 1.4 times MXene@NiCo-LDH (586.2 F g −1 ), as well as good rate capability (512.0 F g −1 at 10 A g −1 ). Besides, the fabricated supercapacitor device (MXene@NiCo-LDH/Co 9 S 8 //activated carbon) showed an outstanding energy density of 96.4 Wh kg −1 at 800 W kg −1 ), and good cyclic performance of 70.26 % capacitance retention even over 9000 cycles. This research may provide a promising strategy for developing two-dimensional layered materials as an electrode material in energy storage applications.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
FuYin Lan,HaiYan Zhang,Jinchen Fan,Qunjie Xu,Hexing Li,YuLin Min
Herein, we introduce polymer nanofibers of TiO2@NiCo-LDH as interlayers into Li–S batteries. From 0 to 60 °C, the interlayers can deliver high sulfur utilization, an outstanding rate capability, and excellent cycling life. High-temperature excitation makes it easier for the valence band electrons of TiO2 to transition to the conduction band. The electron–hole pairs formed on the surface combine with the ether group of 1,3-dioxolane in the electrolyte, which greatly reduces the decomposition and volatilization rates of the electrolyte, ensuring Li–S batteries with good cycle performance at high temperatures. The capacity can stabilize at 798.6 mAh g–1 after 100 cycles at 60 °C and 1C, and the battery can provide a capacity higher than 323.2 mAh g–1 at 0 °C. Simultaneously, the lithium metal symmetrical battery with a functional separator can be continuously cycled for 1800 and 750 h without a short circuit at the current densities of 0.65 and 1.63 mA cm–2, respectively.
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Journal of Energy Storage
·
2024
·
IF 8.9
Lingling Zhang,Yumei Luo,Qingyong Wang,Dan Wei,Haopan Hu,Peixiu Yan,Xu Feng,Shujun Qiu,Fen Xu,Weiping Cao,Lixian Sun,Hailiang Chu
The exploration of transition metal-based electrode materials for asymmetric supercapacitors has garnered considerable interest owing to their potential to achieve high-energy storage and demonstrate outstanding electrochemical performance. In this study, we designed and synthesized Zn-doped NiCo layered double hydroxide (LDH), a hollow supercapacitor electrode material, through a facile ion exchange method at room temperature . Doping Zn ions results in an increased interlayer spacing expanding from 0.815 nm (ZIF-67@NiCo-LDH) to 0.874 nm (ZnNiCo-LDH-7), which facilitates sufficient penetration of the electrolyte and accelerates the charge transfer kinetics. Moreover, by employing the metal-organic framework ZIF-67 as a precursor, ZnNiCo-LDH nanosheets assembled in hollow nanocages exhibit remarkable electrochemical performance due to their large contact area with electrolytes and superior electrical conductivity . The synthesized ZnNiCo-LDH electrode material achieves a high specific capacitance of 1908 F g −1 at 1 A g −1 . When integrated into an asymmetric supercapacitor , in combination with activated carbon (AC), the device delivers an outstanding energy density of 41.5 Wh kg −1 at a power density of 825 W kg −1 . Notably, the assembled device shows exceptional cycling stability, retaining 120 % of its initial specific capacitance even after 5000 cycles at a current density of 5 A g −1 . The extraordinary performance and remarkable stability are mainly due to Zn ion doping-induced local lattice expansion and the hierarchical hollow nanocage structure, which underscores its highly promising potential in supercapacitor applications.
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ACS Applied Electronic Materials
·
2021
·
IF 3.314
Shaoling Cong,Yufei Yang,Kanshe Li,Fan He,Jian Liu,Hua Yuan,Xiaoqin Wang,Runlan Zhang,Jia Chu,Ming Gong,Bohua Wu,Shanxin Xiong,Anning Zhou
Metal organic frameworks (MOFs) have good porosity and adjustable morphology, which are always used as excellent sacrificial templates to derive high-performance layered double hydroxides (LDHs). Here, a humate-based ZIF-67 (HA–ZIF-67) template is first prepared by a natural precipitation method using humates as a substrate. And a humate-based NiCo–LDH (HA–NiCo–LDH) composite material is then successfully prepared via a solvothermal approach with ethanol as a protic solvent. Due to the special composite structure including NiCo–LDH nanocages assembled by interlaced nanosheets, suitable incorporation of layered humate substrate with graphitized microdomains and rich mesopores, the HA–NiCo–LDH exhibits a low resistance during the ionic diffusion, charge transfer, and electron conduction process, a large capacity of 1083 C g–1 (0.5 A g–1), and an excellent cycle stability with a capacity retention of 77% over 10000 GCD loops at 5 A g–1. The assembled asymmetric supercapacitor of the HA–NiCo–LDH//AC also has a decent capacity retention of 52% of initial value with the current density increasing from 0.5 to 10 A g–1, and a large energy density of 44.9 Wh kg–1 at a power density of 348 W kg–1. Its capacity retention is still high to 98% at 5 A g–1 over 5000 GCD loops. Hence, the moderate incorporation of humates is of great significance for practical applications of the NiCo–LDH in supercapacitors.
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Materials Today Chemistry
·
2026
·
IF 7.4
Guorong Liu,Fangyu Zhang,Wendan Yang,Xiaofeng Sun,Yanyan Dai,Jinyuan Ma,Zao Yi
Ni 0.9 Cu 0.1 Co-LDH/15ReS 2 hollow nanocages was constructed. • The introduction of Cu into NiCo-LDH not only enhanced visible light absorption but also effectively suppresses the recombination of photogenerated carriers. • The BEF formed at the interface between Ni 0.9 Cu 0.1 Co-LDH and ReS 2 can facilitate the spatial separation and directional migration of photogenerated carriers. • The mechanism is explained through the complementary combination of experimental analysis and theoretical calculation. • Outstanding operational stability. The pursuit of efficient and stable photocatalysts for solar-driven hydrogen evolution is critical to addressing the global energy crisis. Herein, a novel S-scheme heterojunction is constructed by integrating ReS 2 particles onto Cu-doped NiCo-layered double hydroxide (Ni 1-x Cu x Co-LDH) hollow nanocages, synthesized via an “etch and grow” method using ZIF-67 as a template. The optimized Ni 0.9 Cu 0.1 Co-LDH/15ReS 2 composite achieves a hydrogen precipitation rate of 4.17 mmol g −1 h −1 under the illumination of visible light, which is 5.48-fold and 3.11-fold higher than those of pristine NiCo-LDH and ReS 2 , respectively. This performance improvement is attributed to the synergy of three key factors. (i) Cu doping effectively modulates the electronic structure of the LDH, introduces defect levels to narrow the bandgap (from 2.1 eV to 1.9 eV) for enhanced visible light absorption, and serves as charge balancer to suppress carrier recombination. (ii) The formation of an ordered heterostructure between Ni 0.9 Cu 0.1 Co-LDH and ReS 2 at their interface creates a built-in electric field that promotes the spatial separation and directional migration of photogenerated charge carriers, markedly reduces the likelihood of their recombination. (iii) The heterojunction exhibits a large specific surface area (109.23 m 2 /g), which effectively exposes more catalytic active sites and prolongs the light propagation path, thereby enhancing surface reaction efficiency and light utilization. The composite also exhibits outstanding stability, retaining 96% of its initial activity after four photocatalytic cycles. Combined theoretical calculations and experimental analyses confirm that the well-matched band alignment and robust interfacial interaction enable effective spatial separation of photogenerated carriers while preserving strong redox potentials. The work demonstrates a very promising strategy for designing high performance LDH-based S-scheme heterojunctions toward sustainable solar-to-chemical energy conversion.
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