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Xian Yan, Zhiliang Jin, Yupeng Zhang, Hai Liu, Xiaoli Ma
In the present study, we have successfully synthesized a kind of high-efficiency NiCo2O4/CdS composite photocatalyst using the hydrothermal method and high-temperature calcination. With the addition of NiCo2O4, hydrogen evolution has been significantly improved by successfully adjusting the electron transport routes. For the composite catalyst, the maximum amount of hydrogen evolution under visible light irradiation for 5 hours reached 549 μmol. Through this phenomenon, the hydrogen production rate of the corresponding composite catalysts reached 10 980 μmol g-1 h-1...
February 20, 2019: Physical Chemistry Chemical Physics: PCCP
Sathish Deshagani, Xinhua Liu, Billy Wu, Melepurath Deepa
Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower coated poly(3,4-ethylenedioxypyrrole) (NiCo2O4@PEDOP) hybrid electrodes. The free standing films of carbon nano-fibers (CNFs), synthesized by electrospinning, were sandwiched between the NiCo2O4@PEDOP hybrid and the electrolyte coated separators on both sides of the cells. The CNF film conducts both ions and electrons, and confines the charge at the respective electrodes, to result in an improved specific capacitance (SC) and energy density compared to the analogous cell without the CNF interlayers...
January 23, 2019: Nanoscale
Qi Zhang, Chaoji Chen, Wenshuai Chen, Glenn Pastel, Xiaoyu Guo, Shou-Xin Liu, Qingwen Wang, Yixing Liu, Jian Li, Haipeng Yu, Liangbing Hu
Nanocellulose has emerged as a promising sustainable nanomaterial for constructing advanced electrochemical energy storage systems with renewability, lightweight, flexibility, high performance, and good safety. Here, we demonstrate a high-performance all-nanofiber asymmetric supercapacitor (ASC) using a forest-based, nanocellulose-derived hierarchical porous carbon (nanocellulose-carbon, HPC) anode, a mesoporous nanocellulose membrane separator (nanocellulose-separator) and a NiCo2O4 cathode with nanocellulose carbon as support matrix (nanocellulose-cathode, HPC/NiCo2O4)...
January 18, 2019: ACS Applied Materials & Interfaces
Fei Lu, Min Zhou, Kun Su, Tao Ye, Yijun Yang, Tran Dai Lam, Yoshio Bando, Xi Wang
Spinel NiCo2X4 (X = O or S), comprising two geometrical cobalt ions: Co2+ in tetrahedral site (Co2+Td) and Co3+ in octahedral site (Co3+Oh), has widely evaluated as a promising pseudocapacitor electrode material. Previous literatures mainly demonstrated that much higher specific capacitance of NiCo2S4 than that of NiCo2O4 was ascribed to the higher electronic conductivity. However, we argue that only a small amount of capacitance can be induced by the electronic conductivity, while the significance of electrochemical active species in these system has long been ignored...
December 20, 2018: ACS Applied Materials & Interfaces
Wen Zhao, Xiaomin Li, Rui Yin, Lei Qian, Xiaoshuai Huang, Hu Liu, Jiaoxia Zhang, Jun Wang, Tao Ding, Zhanhu Guo
Urchin-like NiO-NiCo2O4 microspheres with heterostructures were successfully synthesized through a facile hydrothermal method, followed by thermal treatment. The unique structure of NiO-NiCo2O4 with the synergetic effect between NiCo2O4 and NiO, and the heterostructure favour the catalytic activity towards Li-O2 batteries. NiCo2O4 is helpful for boosting both the oxygen reduction reaction and oxygen evolution reaction for the Li-O2 batteries and NiO is likely to promote the decomposition of certain by-products...
December 11, 2018: Nanoscale
Yujing Liu, Xuan Wang, Xiaohui Jiang, Xia Li, Liangmin Yu
N-Doped carbon nanomaterials have gained tremendous research interest in energy storage because of their high capacitance and chemical stability. Here, N-doped porous carbons (NPCs) with multiple shape-controlled and tunable morphologies are developed through a direct one-step pyrolysis/activation method. Typically, NPC-700-1, which is 5 nm thick and 6 μm wide, shows a high surface area (1591.5 m2 g-1) and hierarchical micro-, meso-, and macroporous architecture. The maximum specific capacitance of the as-prepared carbon nanosheets is 406 F g-1 at 1 A g-1 in KOH electrolyte...
November 29, 2018: Nanoscale
Quan Zong, Hui Yang, Qianqian Wang, Qilong Zhang, Jin Xu, Yulu Zhu, Huiying Wang, Hao Wang, Fang Zhang, Qianhong Shen
Transition metal phosphides (TMPs) represent an important class of compounds with metalloid characteristics and good electrical conductivity, which are of great benefit to enhance electrochemical performances. Thus it is important to clarify the correlation between the electrochemical properties and the phosphating degree of the precursor. Herein, we report a superior electrode for battery-like capacitors based on NiCo2O4/NiCoP hetero-structure nanoflake-nanowire arrays grown on nickel foams using a one-pot facile hydrothermal approach and a controllable phosphorization treatment method...
November 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Liting Yang, Baogang Zhang, Bo Fang, Ligang Feng
Residuals have rarely been granted attention when employing a hydrothermal approach to prepare binder-free supported catalysts. Using Ni foam supported NiCo2O4 catalyst for oxygen evolution reaction as an example, it was found that the catalytic activity of NiCo2O4 from the residuals loaded on glass carbon is comparable to Ni foam supported NiCo2O4, while the specific activity and turnover frequency value of the former catalyst are many times higher than that of the supported catalyst. In view of sustainability and green development, residuals should be given more attention when catalyst is prepared using the hydrothermal fabrication approach...
November 20, 2018: Chemical Communications: Chem Comm
Anil Kumar Yedluri, Hee-Je Kim
A novel multi-component and binder-free electrode material of NiCo2 O4 (NCO) nanoplates adhered to NiMoO4 (NMO) honeycomb composites was prepared on a nickel foam (NF) using a simple chemical bath deposition strategy. This paper reports the synthesis of a honeycomb composite with folded silk-like NF@NMO@NCO nanostructures on nickel foam and its use to increase the availability of electrochemically active sites to provide additional pathways for electron transport and improve the utilization rate of the electrode materials...
November 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Tingting Zhou, Xiupeng Liu, Rui Zhang, Yubing Wang, Tong Zhang
Achieving a novel structural construction and adopting appropriate catalyst materials are key to overcoming inherent limitations of gas sensors in terms of designing sensing layers. This work introduces NiO/NiCo2 O4 truncated nanocages functionalized with PdO nanoparticles, which were proved to possess the ability of effective acetone detection. The device realized an enhanced acetone-sensing sensitivity, together with excellent selectivity and long-term stability. The sensing performance is far better than sensors based on NiO/NiCo2 O4 solid nanocubes and NiO/NiCo2 O4 truncated nanocages without PdO decorating, which is related to cooperative effects of the high specific surface area and efficient catalytic activity...
October 31, 2018: ACS Applied Materials & Interfaces
Feng Yan, Jianyu Kang, Shen Zhang, Chunyan Li, Chunling Zhu, Xitian Zhang, Yujin Chen
We developed a facile method for the growth of hollow structured NiCo2 O4 nanoparticles on a graphene sheet (NiCo2 O4 -h/G). The hollow NiCo2 O4 nanoparticles have an average diameter of approximately 10.0 nm and a shell thickness of merely 2.5 nm. The NiCo2 O4 -h/G hybrid exhibited excellent electromagnetic wave absorption with minimal reflection loss below -20 dB at absorber thickness ranging from 2.0 to 5.0 mm, outperforming the solid NiCo2 O4 nanoparticles on the graphene sheet. Remarkably, even for a thickness as small as 1...
October 21, 2018: Nanoscale
Shengjie Peng, Feng Gong, Linlin Li, Deshuang Yu, Dongxiao Ji, Tianran Zhang, Zhe Hu, Zhiqiang Zhang, Shulei Chou, Yonghua Du, Seeram Ramakrishna
The durability and reactivity of catalysts can be effectively and precisely controlled through the careful design and engineering of their surface structures and morphologies. Herein, we develop a novel "adsorption-calcination-reduction" strategy to synthesize spinel transitional metal oxides with a unique necklace-like multishelled hollow structure exploiting sacrificial templates of carbonaceous microspheres, including NiCo2 O4 (NCO), CoMn2 O4 , and NiMn2 O4 . Importantly, benefiting from the unique structures and reduction treatment to offer rich oxygen vacancies, the unique reduced NCO (R-NCO) as a bifunctional electrocatalyst exhibits the dual characteristics of good stability as well as high electrocatalytic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER)...
October 24, 2018: Journal of the American Chemical Society
Pengxiao Sun, Weidong He, Hongcen Yang, Ruya Cao, Jiangmei Yin, Chenggang Wang, Xijin Xu
High-security deformable energy-storage devices that are mechanically robust, with considerable energy and power densities are becoming desirable for smart wearable electronics. Here, a highly flexible hydrogel-based all-solid-state hybrid supercapacitor was rationally designed and assembled, with unique NiCo2O4@NixCoyMoO4 (x : y = 3 : 1) nanostructures as the electrode, which was bio-inspired by the curling up and relaxation of hedgehogs. The hybrid supercapacitor shows no obvious decay in capacitance during bending to different states, indicating its outstanding flexibility and mechanical stability...
October 18, 2018: Nanoscale
Yuanchao Pang, Shuyang Zhang, Sheng Chen, Jin Liang, Mingyan Li, Dawei Ding, Shujiang Ding
Increasing demand for effective energy-storage systems derived from low-cost and ecofriendly raw materials has aroused wide concern. In this contribution, we propose nitrogen-abundant amorphous micron-sized carbon ribbons (AMCRs) originating from biomass raupo as a novel substrate due to their specific quasi 2D morphologies and outstanding dispersion ability. Owing to the innate nitrogen atoms on the surface of AMCRs, ultrathin binary and ternary metal oxide (NiO, CoO, and NiCo2 O4 ) nanosheets can be uniformly developed under benign conditions...
October 26, 2018: Chemistry: a European Journal
Xiaoqiang Du, Qibin Wang, Yu Li, Xiaoshuang Zhang
It is imperative to develop bifunctional electrocatalysts with good activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In this paper, a hierarchical NiCo2O4/Ni3S2 hybrid is synthesized by direct growth on nickel foam (NF) using co-precipitation and sulfuration as a general two-step method. When the NiCo2O4/Ni3S2/NF material is used as an electrode, it displays high activity and perfect stability for OER. A low overpotential of only 360 mV is obtained at 40 mA cm-2, comparable to the benchmark of IrO2 electrodes (330 mV overpotential at 40 mA cm-2), benefiting from the particular hybrid structure of NiCo2O4/Ni3S2/NF with large surface area and fast electron transfer...
July 31, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Nengneng Xu, Yixiao Cai, Luwei Peng, Jinli Qiao, Yu-Dong Wang, William M Chirdon, Xiao-Dong Zhou
Central to commercializing metal-air batteries is the development of highly efficient and stable catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this study, a composite catalyst with a unique interpenetrating network (denoted as NiCo2O4@MnO2-CNTs-3) was synthesized and exhibited better bifunctional activity (ΔE = 0.87 V) and durability than both Pt/C and Ir/C catalysts. The improved performance arises from three factors: (i) MnO2 promotes the ORR while NiCo2O4 facilitates the OER; (ii) carbon nanotubes improve the electronic conductivity; and (iii) the highly porous structure enables the adsorption-desorption of O2 and enhances the structural stability...
July 19, 2018: Nanoscale
Andrew Schranck, Randal Marks, Elon Yates, Kyle Doudrick
Cyclic voltammetry (CV) and in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy were used to investigate the effect of major urine compounds on the electro-oxidation activity of urea using a nickel cobaltite (NiCo2 O4 ) catalyst. As a substrate, carbon paper exhibited better benchmark potential and current values compared with stainless steel and fluorine-doped tin oxide glass, which was attributed to its greater active surface area per electrode geometric area. CV analysis of synthetic urine showed that phosphate, creatinine, and gelatin (i...
August 7, 2018: Environmental Science & Technology
Man Yang, Yunfeng Li, Yue Yu, Xianchun Liu, Zhan Shi, Yan Xing
In this work, a series of three-dimensional porous flower-like zinc doped NiCo2 O4 (ZNCO) nanostructures with different Zn doping level are successfully prepared by a facile solvothermal process without using any templets. The obtained products are characterized by various techniques, and their electrocatalytic performances are also assessed by the oxygen evolution reaction (OER). According to the electrochemical characterization, it is demonstrated that ZNCO-0.15 (i.e., Zn0.15 Ni0.85 Co2 O4 ) nanoflowers show a lower overpotential, smaller Tafel slope, higher electrochemical active surface area (ECSA), as well as a larger turnover frequency (TOF) value than those of Co3 O4 , NiCo2 O4 , and ZnCo2 O4 nanoflowers, indicating that introduction of an optimal content of zinc ions plays an important role in enhancing electrocatalytic performances for OER...
September 3, 2018: Chemistry: a European Journal
X Luo, M Huang, D He, M Wang, Y Zhang, P Jiang
High electrical conductivity and the exposure to more active sites are crucial to boost the performance of a glucose sensor. A porous binary metal oxide nanoarray integrated on a binder-free 3D electrode is expected to offer a highly sensitive sensing platform. As a model, porous NiCo2O4 nanowire arrays supported on carbon cloth (NiCo2O4 NWA/CC) have been prepared and used for enzyme-free glucose sensing. NiCo2O4 NWA/CC shows larger effective surface area, superior electronic conductivity, and higher catalytic activity towards enzyme-free glucose sensing, with a linear range from 1 μM to 0...
May 29, 2018: Analyst
Hairong Xue, Hongjie Yu, Yinghao Li, Kai Deng, You Xu, Xiaonian Li, Hongjing Wang, Liang Wang
Control of structures and components of the nanoarray catalysts is very important for electrochemical energy conversion. Herein, unique NiCo2 O4 @MnO2 core-shell nanoarray with hollow NiCo2 O4 Cores and MnO2 flake shells is in situ fabricated on carbon textile via a two-step hydrothermal treatment followed by a subsequent annealing. The as-made nanoarray is highly active and durable catalyst for oxygen evolution reaction in alkaline media attribute to the synergetic effect derived from spatially separated nanoarray with favorable NiCo2 O4 and MnO2 compositions...
July 13, 2018: Nanotechnology
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