ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Shi-Wen Lv,Ning Zhao,Jing-Min Liu,Fei-Er Yang,Chun-Yang Li,Shuo Wang
Integration of novel bio-/nanostructures as effective sensing platforms is still of great significance for robust and rapid analysis. Herein, a novel metal–organic framework-derived NiCo2O4 was synthesized via a feasible templating method. Significantly, redox couples of both Ni3+/Ni2+ and Co3+/Co2+ provided richer oxidation–reduction reactions, thereby leading to an enhanced catalytic activity. Furthermore, NiCo2O4 as an enzyme mimic with peroxidase-like activity and oxidase-like activity could oxidize colorless thylbenzidine (TMB) to blue oxTMB in the absence of H2O2. Thus, a sensitive chromogenic sensing platform for detecting Fe2+, thiourea, cysteine (Cys), and epigallocatechin-3-gallate (EGCG) was proposed. The colorimetric detection methods exhibited great features of low limit of detection (LOD) and broad linear range. Owing to the complexation reaction, the chromogenic sensing system of TMB + NiCo2O4 + Cys achieved effective detection of Cu2+ and Mn2+ with the LODs of 0.0022 and 0.0181 mM, respectively. Developed detection methods with wide linear ranges of 0.008–0.1 mM for Cu2+ and 0.08–1 mM for Mn2+ had excellent practical potential. Similarly, the reaction system of TMB + NiCo2O4 + EGCG could achieve the colorimetric detection of Cu2+ and Fe3+. The great chromogenic sensing performance for detecting Cu2+ and Fe3+ with a broad linear range and a low LOD could be also realized.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yu Liu,Zhenlin Ma,Na Xin,Yulong Ying,Weidong Shi
Multi-dimensional metal oxides have become a promising alternative electrode material for supercapacitors due to their inherent large surface area. Herein, P-doped NiCo 2 O 4 /NiMoO 4 multi-dimensional nanostructures are synthesized on carbon clothes (CC) with a continuous multistep strategy. Especially, P has the best synergistic effect with transition metals, such as optimal deprotonation energy and OH – adsorption energy, which can further enhance electrochemical reaction activity. For the above reasons, the P-NiCo 2 O 4 /NiMoO 4 @CC electrode exhibits an ultra-high specific capacitance of 2334.0 F g −1 at 1 A g −1 . After 1500 cycles at a current density of 10 A g −1 , its specific capacity still maintains 93.7%. Besides, a P-NiCo 2 O 4 /NiMoO 4 @CC//activated carbon device (hybrid supercapacitor or device) was also prepared with a maximum energy density of 45.1 Wh kg −1 at a power density of 800 W kg −1 . In particular, the capacity retention rate is still 89.97% after 8000 cycles due to its excellent structural stability. Our work demonstrates the vast potential of multi-dimensional metal oxides in energy storage.
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Small
·
2020
·Vol. 16
·期 44
·2004188
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IF 11.459
Xiaofeng Zhang,Feng Yang,Haixin Chen,Kun Wang,Junwei Chen,Yi Wang,Shuqin Song
In order to further overcome the shortage of electrodes with additive/binder and modulate the structure of NiCo 2 O 4 for supercapacitors, ultrathin NiCo 2 O 4 nanosheet arrays have been in situ grown on Ni foam by optimizing hydrothermal reactions based on crystal growth dynamics. The structure of ultrathin NiCo 2 O 4 nanosheet arrays can expose more active sites, provide abundant diffusion channels and buffer the stress caused by phase transition during charge–discharge process of supercapacitors. The optimized hydrothermal reactions can provide more ordered crystal orientations by keeping nanosheets on Ni foam completely coming from in situ growth, which will decrease the inner resistance of ultrathin NiCo 2 O 4 nanosheets and improve the efficiency and kinetics of electrons transfer. By the virtue of such remarkable features, the electrochemical results confirm the rationality of structural modulation and crystal orientations optimization with a drastically enhanced specific capacitance of 2017.8 F g −1 , admirable rate performance of 93.2% and outstanding stability retention of 90.9% after cycling 5000 times. More impressively, the assembled flexible solid-state asymmetric supercapacitor (ASC) shows superior energy density, power density, and high stability. The modification strategy in this paper may throw light on the rational design of new generation advanced electrode materials for high-performance flexible supercapacitors.
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Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 5
·1257-1272
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IF 5.958
Yongpeng Xia,Sheng Wei,Qiang Huang,Jianquan Li,Xinghua Cen,Huanzhi Zhang,Hailiang Chu,Lixian Sun,Fen Xu,Pengru Huang
Lithium alanate (LiAlH4), as a prototypical high-capacity complex hydride, has attracted intense interest as a promising hydrogen storage material. However, the drawbacks of high dehydrogenation temperatures and slow kinetics in the dehydrogenation process limit its practical applications. Herein, we have successfully synthesized NiCo2O4 nanorods anchored on rGO through a low-temperature solution method coupled with annealing treatment, and efficient effects derived from the NiCo2O4@rGO composite towards the dehydrogenation of LiAlH4 are demonstrated. The ball-milled LiAlH4 + 7 wt% NiCo2O4@rGO sample starts to decompose at 62.7 °C and releases a total of 6.28 wt% hydrogen, which is 118 °C lower than that of as-received LiAlH4, and 42.8 °C lower than that of ball-milled LiAlH4. The isothermal dehydrogenation kinetics show that the LiAlH4 + 7 wt% NiCo2O4@rGO sample could release approximately 4.0 wt% hydrogen within 20 min at 150 °C, whereas less than 0.04 wt% hydrogen release was detected for LiAlH4 under identical conditions within 100 min. Kinetic measurements reveal 21.9% and 37.1% reduction in the apparent activation energy of the two-step dehydrogenation of undoped LiAlH4, respectively, in the presence of a 7 wt% NiCo2O4@rGO additive. It is reasonable to conclude that the large surface area and mesoporous structures provided by NiCo2O4@rGO nanocomposites play a synergistic role in remarkably improving the dehydrogenation properties of LiAlH4.
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ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yanyu Lin,Rongkai Shen,Nannan Liu,Huan Yi,Hong Dai,Jianhua Lin
Here, a simple electrochemical biosensor was proposed based on the specific recognition between trypsin and peptide. Initially, NiCo 2 O 4 -PAMAM nanocomposite was casted on the bare electrode to achieve the electrochemical signal amplification in 0.1 mM [Ru(NH 3 ) 6 ] 3+ solution owing to the great electronic conductivity and high electrochemical activity induced by the special structure of NiCo 2 O 4 nanosheets (Ni 3+ cations in octachedral sites of the Co 3 O 4 ). Subsequently, a declined electrochemical signal was obtained when g-C 3 N 4 labeled peptide composites were anchored on the electrode. However, after trypsin was added into solution and incubated with the biosensor, the electrochemical signal was re-promoted. Therefore, the as-synthesized biosensor could realize the sensitive detection of trypsin by virtue of the specific recognition between trypsin and peptide. As a result, the developed peptide-based exhibited a linear range from 10 −10 to 10 −4 mg mL −1 with an ultralow detection limit of 10 −10 mg mL −1 , providing sensitive analytical performance and acceptable application potential in clinical test and disease diagnosis due to its high stability, excellent selectivity , acceptable reproducibility and accurate signal output.
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Energy Technology
·
2018
·Vol. 7
·期 5
·1800940
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IF 3.175
Maofeng Zhang,Wenzhen Liu,Ran Han,Jun Xu,Zhenjie Sun,Jiaqin Liu,Yucheng Wu
The synthesis of an efficient and economically viable supercapacitor material with a large areal capacitance for miniaturized consumer electronics is still a major challenge. Herein, densely packed 3D flower-like NiCo 2 O 4 @NiMoO 4 /reduced graphene oxide (rGO) composites on Ni foam which can be directly utilized as a supercapacitor material are demonstrated. The overall electrochemical performance can be significantly enhanced by an increase in the packing density of 3D flower-like structure, highly porous spatial construction, and the synergistic effects of the three materials, which generates a larger areal capacitance of 9.41 F cm −2 and a superior cycling stability with 75% areal capacitance retention after 2000 charge–discharge cycles. This simple and low-cost supercapacitor material may have potential applications in energy storage devices.
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ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Zhiqiang Wang,Sha Zeng,Weihong Liu,Xingwang Wang,Qingwen Li,Zhigang Zhao,Fengxia Geng
Developing efficient but nonprecious bifunctional electrocatalysts for overall water splitting in basic media has been the subject of intensive research focus with the increasing demand for clean and regenerated energy. Herein, we report on the synthesis of a novel hierarchical hybrid electrode, NiFe-layered double hydroxide molecularly ultrathin sheets grown on NiCo2O4 nanowire arrays assembled from thin platelets with nickel foam as the scaffold support, in which the catalytic metal sites are more accessible and active and most importantly strong chemical coupling exists at the interface, enabling superior catalytic power toward both oxygen evolution reaction (OER) and additionally hydrogen evolution reaction (HER) in the same alkaline KOH electrolyte. The behavior ranks top-class compared with documented non-noble HER and OER electrocatalysts and even comparable to state-of-the-art noble-metal electrocatalysts, Pt and RuO2. When fabricated as an integrated alkaline water electrolyzer, the designed electrode can deliver a current density of 10 mA cm–2 at a fairly low cell voltage of 1.60 V, promising the material as efficient bifunctional catalysts toward whole cell water splitting.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xuan Li,Yuyan Cao,Yihui Shen,Yulin Wu,Shicong Cui,Lingli Cheng,Xuechun Yang,Zheng Jiao
Nowadays, designing sensing materials possessing both high sensitivity and humidity resistance is still a challenge in the field of sensing materials. In this work, a ternary Ag nanoparticles decorated NiCo 2 O 4 /NiO (Ag/NiCo 2 O 4 /NiO) composite with hollow nanocage structure has been successfully obtained, which uses ZIF-67 as a template combined with self-etching method, followed by NaBH 4 reduction of silver ions. For the synergistic effect of the novel morphology, the presence of Ag nanoparticles and hydroxyl absorbent NiO, and the formation of p-p heterojunction between NiCo 2 O 4 and NiO, Ag/NiCo 2 O 4 /NiO exhibits good humidity resistance and high-sensitive to n-butanol. The mesoporous hollow nanocage morphology not only provides abundant adsorption sites for target gases, but also facilitates the diffusion of water molecules. The doping of Ag nanoparticles can regulate the adsorption of oxygen on the surface of gas sensing materials, improving the sensitivity while suppressing the hydroxyl poisoning reaction process. The hydroxyl absorbent NiO in Ag/NiCo 2 O 4 /NiO can both directly absorb water and form p-p heterojunction structure with NiCo 2 O 4 , which improves sensor performance while suppressing hydroxyl poisoning. In the gas sensing tests, the optimal Ag/NiCo 2 O 4 /NiO composites can achieve a high response value of 31.41, as well as rapid response/recovery times (65 s/47 s) to 100 ppm n-butanol at the working temperature of 170 °C. Moreover, it displays a wide detection range (1–120 ppm), a low detection limit (0.27 ppm), excellent selectivity to n-butanol, and superior long term stability (maintaining a response value of 84.68 % after 14 days). Notably, the optimal Ag/NiCo 2 O 4 /NiO demonstrates great humidity-tolerant ability with a response values fluctuation of 16 % under the range of 33 %-80 % relative humidity. This research provides a feasible approach for designing practical gas sensing materials with high sensitivity and moisture resistance.
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LANGMUIR
·
2025
·
IF 3.9
Xuning Li,Yunpeng Li,Lin Wang,Jun Liu,Lin Chen,Xiao Zhu,Jingcheng Hao,Yongliang Ma,Junhua Li,Xu Wu
During thermal regeneration of styrene-saturated activated carbon (AC), styrene’s C=C bonds are prone to polycondensation. It forms fixed carbon species that deposit as carbonaceous residues within AC pores, significantly decreasing the adsorption performance. To address this challenge for efficient AC regeneration and recycling, Ni and Co transition metal components were loaded onto AC and subsequently pyrolyzed to generate NiCo2O4 active species. The optimal Ni–Co loading amount was determined to be 5 wt %. Under these conditions, the adsorbent exhibited optimal cyclic adsorption performance, maintaining 75% of its initial capacity after four consecutive adsorption–regeneration cycles. Comprehensive characterization revealed that the 2.5Ni-2.5Co-AC formulation maximized AC recyclability, and this enhanced performance is attributed to the well-dispersed NiCo2O4 species and the formation of carbon defect sites within the adsorbent. This study presents a novel strategy and provides a scientific basis for solving the regeneration problem of styrene-adsorbed activated carbon.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xiaomin Peng,Jinming Zhang,Tianlun Cen,Zhifeng Ye,Yiyi Liu,Dingsheng Yuan
2-dimensional Co(OH) 2 -NiCo 2 O 4 hybrid nanosheets coupled with N-doping reduced graphene oxide (N-RGO) have been prepared by a facile two-step hydrothermal method for exploring the cost-effective and durable bifunctional oxygen electrocatalysts of Zn-air batteries. Co(OH) 2 -NiCo 2 O 4 /N-RGO exhibits the excellent catalytic activity for ORR with a positive half-wave potential of 0.80 V vs. RHE in 0.1 M KOH. And the assembled rechargeable Zn-air battery achieves a high open-circuit voltage of 1.485 V, a large peak power density of 99 mW cm −2 , and a remarkable cycle life of over 180 h. This work offers an inspiration to obtain efficient electrocatalysts for sustainable energy devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yu Liu,Zhenlin Ma,Xiumei Chen,Yulong Ying,Weidong Shi
Supercapacitor with high storage capacity and small volumes are the development trends of miniaturization and portable energy storage systems. Herein, we design a novel self-supporting P-doped carbon nanotube (P-CNT) intercalating NiCo 2 O 4 /CoP core–shell polyhedron film. P-CNT is an ideal substrate with high electrical conductivity and interconnected porous architecture, which can enable the electrons transport to an external circuit from the electroactive component. NiCo 2 O 4 /CoP core–shell fluffy polyhedrons are derived from metal-organic frameworks with rich oxygen vacancies and abundant characteristics of pseudocapacitance, as well as better wettability. The self-supporting composite film readily achieves an ultra-high gravimetric and volumetric capacitance of 1918.4 F g −1 and 1074.3 F cm −3 at 1 A g −1 . Accordingly, as-assembled hybrid supercapacitors using two binder-free electrodes, i.e., a self-supporting composite film as the positive electrode and P-doped CNT integrating graphene film as the negative electrode, harvest a remarkable gravimetric/volumetric energy density of 68.6 W h kg −1 (41.8 W h L −1 ) at 800 W kg −1 (488 W L −1 ). Our work suggests that the rational-designed NiCo 2 O 4 /CoP@P-CNTs electrode is a competitive candidate for designing next-generation supercapacitors with high volumetric energy density.
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Green Energy & Environment
·
2021
·
IF 8.207
Chenyun Zhang,Bingwei Xin,Tingting Chen,Hao Ying,Zhonghao Li,Jingcheng Hao
Deep eutectic solvents (DESs) have gained much attention in the fabrication of advanced nanoelectrocatalysts due to their amazing template function. However, their stabilizing function for easily hydrolyzed inorganic nanomaterials is rarely studied. Here, a DES-mediated strategy was reported to synthesize octahedral Ni–Co precursor (NiCo–NH 3 complex), which could be directly transformed into NiCo 2 O 4 nanooctahedrons after thermal decomposition. The NiCo–NH 3 precursor in octahedral shape was achieved with the DES-mediated crystallization in the choline chloride (ChCl)/glycerol. The ChCl/glycerol DES not only tailored the morphology of the as-prepared precursor by template effect but also inhibited its hydrolysis, ensuring the successful fabrication of octahedral NiCo–NH 3 complex precursor with high yield. The NiCo–NH 3 complex precursor was converted to well-defined NiCo 2 O 4 nanooctahedrons, where the calcination temperature and time were explored in detail. It revealed that DES could participate in the conversion process to control the morphology of calcination product. The resultant NiCo 2 O 4 nanooctahedrons demonstrated excellent electroactivity and remarkable durability for oxygen evolution reaction (OER). The present strategy not only offers an efficient OER electrocatalyst but also enriches the approaches of DESs in designing advanced nanocatalysts.
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