Journal of Nanoelectronics and Optoelectronics
·
2021
·Vol. 16
·期 6
·926-932
·
IF 0.961
Peng Liwen,Wang Haiwang,Lv Mengge
In this paper, a Mn/NiCo2O4 catalyst was prepared for the complete oxidation of low-concentration methane. When the ratio of Mn: Co is 1:4, the catalyst has the best catalytic activity, and the best methane conversion temperature Feis 400 °C. In addition, the
catalytic activity remains stable during the long-term reaction, showing adequate thermal stability. The catalyst is grown on FeCrAl alloy by hydrothermal method to complete the catalytic oxidation of methane. In the catalysis process, the Mn/NiCo2O4-FeCrAl catalyst is
energized and the current is directly passed through the alloy substrate to generate Joule heat, reaching the optimal catalytic temperature for complete oxidation of methane.
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Physica Status Solidi-Rapid Research Letters
·
2025
·
IF 2
Yi Chen,Cong Liu,Ruixue Sun,Guojie Yin,MR. Manikandan,Yifan Lv,Jingyu Shi,Yu Hao,Rui Liu,Yanchun Hu,Shaoqian Yin,Xianwei Wang
In this study, we investigate the effect of varying tannic acid (TA) concentrations on the electrochemicalperformance of NiCo-MOF-derived nanocomposite electrode materials. The TA@NiO@NiCo 2 O 4 nanocomposites were synthesized using a straightforward metal–organic framework (MOF) templating strategy, which involved a simple hydrothermal method followed by a two-step annealing process. Electrochemical characterization reveals that the resulting nanocomposites exhibit excellent cycling stability. Among them, the sample treated with 0.02 mol L −1 TA achieves the highest specific capacitance, reaching 773 F g −1 at a current density of 1 A g −1 . Furthermore, the nanocomposites display reduced electrical impedance, with the 0.02 mol L −1 TA sample recording a series resistance (Rs) as low as 0.60 Ω. After 5000 galvanostatic charge–discharge cycles, the capacity retention of samples treated with TA concentrations of 0, 0.01, and 0.02 mol L −1 all exceed 100%, indicating remarkable electrochemical durability.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Li-li Wan,Guo-long Zang,Xin Wang,Le-an Zhou,Tian Li,Qi-xing Zhou
Oxygen reduction reaction (ORR) plays an important role in green energy conversion, although catalysts are necessary for overcoming its sluggish kinetic. Herein, a nanocrystal NiCo 2 O 4 /N-doped graphene composite material showing high ORR electrocatalytic activity is prepared. The resulting NiCo 2 O 4 /N-doped graphene composite (NiCo 2 O 4 -NG/C) combines the advantages of both component materials and shows enhanced ORR electrocatalytic activity (i.e., more positive peak potential and half-wave potential compared with NiCo 2 O 4 ) while having higher diffusion-limited current density values (−5.7 mA cm −2 , 1600 rpm), better tolerance to methanol, and improved stability than 20 wt% Pt/C. NiCo 2 O 4 anchored on N-doped graphene are demonstrated to be nanocrystal with tiny crystalline grain (diameter < 5 nm) and result in large surface area , thereby allowing more active sites to be exposed. Moreover, the potential exposure of high-index planes may be also responsible for the observed high activity of these materials.
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JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xueqin Wang,Shuaiyu Gao,Yuelin Zhao,Wenqi Wu,Hongyun Lai,Huifeng Li,Genban Sun
Lithium-oxygen (Li-O 2 ) batteries stand out as ideal candidates for next-generation energy storage due to their ultrahigh theoretical energy density. However, the sluggish kinetics of the oxygen reduction and evolution reactions at the cathode pose a major challenge, necessitating the development of efficient catalysts to overcome practical limitations. Herein, Fe-doped Co 3 O 4 /NiCo 2 O 4 heterostructures are synthesized as cathode catalysts via chemical etching, cation exchange, and thermal oxidation. The etching process creates a stable hollow nanocube structure that maximizes active site exposure while providing ample space for Li 2 O 2 storage and ion diffusion. A strongly interactive heterojunction forms at the Co 3 O 4 /NiCo 2 O 4 interface, with Fe doping further enhancing interfacial electron interaction to boost catalytic activity. When used in Li-O 2 batteries, this catalyst enables a remarkable discharge capacity of 9572 mAh g −1 , a low overpotential of 1.01 V, and stable cycling over 110 cycles, providing a new strategy for developing high-performance Li-O 2 battery cathodes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Yuqin Jia,Zhiguo Cai,Haifeng Weng,Yulong Zhao,Zhongtian Zeng,Shilong Han,Lei Zhu,Fanguang Zeng,Yihan Ling,Xiaoyan Cai,Liang Mao
Spin engineering via Mn doping precisely steers Co spin state in NiCo 2 O 4 , beyond the conventional d-band center regulation. • Mn-NCO exhibits a low overpotential of 265 mV at 10 mA cm -2 and outstanding durability over 500 h in alkaline electrolyte. • Mn acts as a spin switch to optimize *O adsorption, lowering rate‑limiting barrier from 2.84 to 1.64 eV. • Practical potential is demonstrated via a stable AEM water electrolyzer, bridging fundamental research and application. While regulating the d -band center is a widely adopted strategy for optimizing oxygen evolution reaction (OER) electrocatalysts, it often lacks the precision required for selectively lowering the high energy barrier of the rate-determining step (e.g., *O → *OOH). This work introduces a spin engineering approach via manganese (Mn) doping to effectively tailor the electronic structure of NiCo 2 O 4 (NCO). The Mn-doped NCO porous microspheres, synthesized through a facile solvothermal-oxidation route, deliver outstanding OER performance in 1.0 M KOH, requiring an overpotential of only 265 mV to achieve 10 mA cm −2 current density and maintaining exceptional stability for 500 h. Moreover, the catalyst shows great promise in an anion exchange membrane water electrolyzer. Density functional theory calculations disclose that Mn serves as a “spin switch”, promoting a transition of Co active sites from high-spin (magnetic moment ∼2.4 μB) to low-spin (∼1.9 μB) states. This spin-state modulation selectively weakens the adsorption of the critical *O intermediate, thereby markedly reducing the energy barrier of the rate-determining step from 2.84 eV to 1.64 eV, without significantly perturbing other intermediates. This work not only reports a highly active OER electrocatalyst but also illuminates the pivotal role of spin-state manipulation, offering a new paradigm for designing high-performance electrocatalytic materials. Mn doping serves as a spin switch in NiCo 2 O 4 electrocatalyst, modulating the active Co site from high spin to low spin state to optimize *O adsorption and significantly lower the rate-determining step energy barrier from 2.84 to 1.64 eV. Download: Download high-res image (244KB) Download: Download full-size image
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Xiaoyun Zhang,Benyong Gao,Tao Qin,Jinlong Ma,YiXue Xu,Lili Song,Muxin Liu
Spherical Ru-NiCo 2 O 4 synthesized by hydrothermal-calcination formed Ru-O-Co/Ni bonds to enhance metal-support interaction. • The nanowire-assembled ball-like structure exposed abundant active sites and accelerated mass transfer. • Metal-support interaction effect optimized electronic structure, downshifted d-band center, and regulated intermediate adsorption. • Ru-NiCo 2 O 4 exhibited outstanding OER activity with an overpotential of 217 mV at 10mA/cm² and durable stability over 70 h. Hydrogen production by water electrolysis is a promising approach for renewable energy conversion, yet its efficiency is severely restricted by the sluggish oxygen evolution reaction (OER). Ru-based catalysts exhibit outstanding OER activity but suffer from poor stability and high cost. Constructing metal-support interaction (MSI) is an effective strategy to optimize the electronic structure and stability of Ru catalysts. Herein, fluffy spherical Ru anchored on NiCo 2 O 4 was fabricated via hydrothermal and calcination processes, in which Ru O Co/Ni bridge bonds were formed to strengthen the MSI effect between Ru nanoparticle and NiCo 2 O 4 support. The unique nanowire-assembled ball-like structure exposed abundant active sites and accelerated mass transfer. The MSI effect regulated the electronic structure, derived directional interfacial electron transfer, downshifted the d-band center, and optimized intermediate adsorption for OER. The synthesized Ru-NiCo 2 O 4 catalyst exhibited an overpotential of 217 mV at the current density of 10 mA/cm 2 and a long-term stability of 70 h.
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Inorganics
·
2025
·Vol. 13
·期 7
·211
·
IF 3
Wen Li,Di Yin,Wanxin Liu,Yi Li,Yijin Wu
The electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) coupled with water electrolysis for green hydrogen production is a promising strategy to address energy crises and environmental pollution. Despite the suitable adsorption energy for HMF due to their partially filled d-band electronic structures, Ni- or Co-based oxides/hydroxides still face challenges in insufficient activity and stability. In this study, a porous heterogeneous nickel cobalt oxide/hydroxide growth on nickel foam (NF), which is defined as NF@NiCo-H/O, was developed via immersion in concentrated alkali solution. Compared with the single-component NiCo oxides, the NF@NiCo-H/O catalyst exhibits a lower application potential of only 1.317 V, 1.395 V, and 1.443 V to achieve current densities of 20, 50, and 100 mA cm−2, respectively, in an alkaline solution containing HMF. Additionally, it demonstrates rapid reaction kinetics with a Tafel slope of 27.6 mV dec−1and excellent cycling stability. Importantly, the presence of more high-valent Ni3+-O species on the catalyst surface contributes to its exceptional selectivity for 2,5-furandicarboxylic acid (86.7%), Faradaic efficiency (93.1%), and conversion rate (94.4%). This catalyst provides some theoretical guidance for the development of biomass electrooxidation catalysts for sustainable energy and chemical production.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiangang Zhai,Houhe Pan,Fan Wang,Xiaoya Gao,Zecheng Xiong,Liang Li,Qian Chang,Shujin Cheng,Zicheng Zuo,Yuliang Li
In this paper, the 2D all-carbon graphdiyne, which possesses superior 2D strength and high mixed conductivities for both electrons and ions, is used to protect nickel cobalt oxide nanostructures with multidimensions. The in situ grown graphdiyne seamlessly wraps on nanostructures to form 3D interpenetrating networks, leading to significant improvement in the conductivity and avoidance of the structural degradation. The assembled hybrid asymmetric supercapacitor showed a high specific capacitance of 200.9 F g–1 at 1 A g–1 with an energy density of 62.8 Wh kg–1 and a power density of 747.9 W kg–1. The device also showed a preeminent rate capability (86.4% capacitance retention, while the current density was increased from 1 to 20 A g–1) and an ultrastable long-term cycling performance (the capacitance retention is about 97.7% after 10 000 cycles at a high current density of 20 A g–1).
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PubMed
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Baolei Shen,Xilin Liao,Xuefei Zhang,Hai-Tao Ren,Jia-Horng Lin,Ching-Wen Lou,Ting-Ting Li
Binary transition-metal oxides have caused wide public concern for energy storage as a result of its higher electrical conduction and electrochemical activity compared to single metal oxides in the past few years. However, its practical applications are severely limited by poor specific capacitance and cycling stability. Recently, an effective strategy for enhancing the electrochemical performance of supercapacitors has been demonstrated by proper structural design and optimization of material. Herein, cactus-like NiCo 2 O 4 @NPF nano-flower flexible supercapacitor electrodes assembled from 1D NiCo 2 O 4 nanoneedles on 2D hollow metal networks by simple hydrothermal and calcination treatment. The unique nano-flower structure can construct multi-dimensional channels, which facilitate the transport of electrons and ions and significantly enhances the reaction kinetics at the interface between the electrolyte and the active materials. The NiCo 2 O 4 @NPF-1 electrode displays an outstanding electrochemical energy storage performance and the specific capacitance is 1106 F g −1 at 1 A g −1 . Besides, the composite electrode exhibits a distinguished rate capability (633 F g −1 at 50 A g −1 ) and favorable cyclability (capacity retention of 92.2% after 2000 cycles). These exceptional results recommend that as-assembled NiCo 2 O 4 @NPF nano-flower hybrid material could be a hopeful contender for multifunctional flexible supercapacitor electrodes.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·097510
·
IF 4.386
Zhenting Zhao,Zibang Huang,Dafeng Long,Kai Li,Zhaohui Guo,Fanglong Zhu,Weiping Gong,Jie Hu
A kind of NiCo2O4-based hierarchically-nanostructured composites has been synthesized for electrooxidation of glucose. The Cu(OH)2 nanowires were initially growth in situ on the surface of Cu foam (CF) and wrapped with Ni-Co precursor (Ni-Co Pre) to prepare nanocomposites (Ni-Co Pre@Cu(OH)2 NWs/CF). Then, the obtained composites were annealed in air to form the NiCo2O4 nanosheets wrapped CuO nanowires nanostructures which were supported on the Cu foam (NiCo2O4@CuO NWs/CF). Because of the synergism of Ni, Co and Cu, as well as the enhanced surface area by hierarchical nanostructure, the as-prepared NiCo2O4@CuO NWs/CF sensor exhibits outstanding electrooxidation activity for glucose detection, including high sensitivity (7.98 μA/μM cm−2), wide linear range (1.0 × 10−3−2.0 mM), low detection limit (0.68 μM) and fast response/recovery times (1.3/2.0 s). Meanwhile, the as-fabricated sensor also possesses good reproducibility, flexibility, selectivity and long-term stability, which is a promising platform for glucose electrooxidation and determination in serum sample.
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Ling Li,Zeyuan Ma,Lu Liu,Xiaohui Wang,Jianguo Wang,LiYe Cao,Shuang Liu,Wenming Zhang
Herein, a composite of carbon fibers coated with bimetallic oxide NiCo 2 O 4 are successfully synthesized by combination of electrospun and hydrothermal methods and applied as counter electrode (CE) catalytically for dye-sensitized solar cells (DSSCs). SEM images show the homogeneous distribution of NiCo 2 O 4 nanosheets on the surface of CNFs, which provides enough active centers for electron collection and transmission and makes larger surface area. More importantly, the NiCo 2 O 4 /CNFs CE exhibits high efficiency and electrochemical stability, of which the short circuit current density ( J sc ) reachs 17.11 mA cm −2 . Due to the employment of NiCo 2 O 4 /CNFs composite as CE, the photoelectric conversion efficiency has achieved 7.80%, obviously higher than those of CNFs (5.75%) and Pt (7.35%).The cost-effective NiCo 2 O 4 /CNFs composite may be used to replace the conventional Pt CEs alternatively.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 43
·15633-15639
·
IF 4.39
Mengqi Cui,Zining Wang,Hui Wang,Xuyun Wang,Jianwei Ren
In this work, the micro-controlling of the grain boundaries in NiCo2O4/NiCo2S4 nanowire arrays was achieved by exposing them to a sulfur containing atmosphere at 300 °C with different exposure times. The results showed that the capacitance of the optimal NiCo2S4 sample reached 400 μA h cm−2 at 30 mA cm−2 with a current retention rate of 58.6%. The assembled NiCo2O4/NiCo2S4//activate carbon electrode delivered a capacitance of 299.2 μA h cm−2 and 241.7 μA h cm−2 at a current density of 3 mA cm−2 and 30 mA cm−2, respectively. The cycling tests showed a good current retention rate of 88.1% after 8000 cycles. Besides, the NiCo2O4/NiCo2S4 composite exhibited a power density of 480.1 W kg−1 at an energy density of 47.87 W h kg−1, and 4773.66 W kg−1 at 38.67 W h kg−1, which indicated its potential for practical applications.
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