ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Lianjie Huang,Hao Huang,Wei Guo,Shuang Wang
Ternary transition metal oxides are attractive candidates for supercapacitor electrodes owing to the potential synergistic effects of multi metal species. However, their actual electrochemical performance is not satisfactory due to unsatisfied microstructures, morphologies or components. It is well known that electrode materials with appropriate morphology have a great influence on their electrochemical performance. In this work, a new urchin-like zinc-nickel-cobalt oxide (ZNCO) microsphere with a spinel cubic structure is prepared by simple hydrothermal method. Such an interesting structure is expected to offer larger surface areas, and the multi metal species can enhance the electrical conductivity, introduce extrinsic defects and improve its electrochemical performance. As expected, the specific capacity and rate performance of prepared ZNCO are 766 C/g at 1 A/g and 93.21% of capacity retention at 20 A/g, respectively. The study of charge storage mechanism of ZNCO shows that it includes both diffusion and capacitive-controlled processes. Moreover, the assembled device shows a high specific energy of 41.4 Wh/kg at a specific power of 850 W/kg and the cycling stability is nearly 90% after 20000 charge/discharge cycles. Impressively, the specific energy remains 21.6 Wh/kg at the specific power of 12.75 kW/kg. Therefore, the urchin-like ZNCO microsphere prepared in this work has a good prospect for supercapacitors electrode and this work provides guidance on designing ternary transition metal oxides for energy conversion and storage.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhixian Bao,Dekang Li,Yunfei Wu,Lijun Jin,Haoquan Hu
Ammonia has sparked a lot of interest as a promising hydrogen carrier for the development of renewable energy and as a workable method to produce CO x -free hydrogen for fuel cells through its on-site decomposition. The catalysts, composed of nickel as an active metal supported on the Y 2 O 3 , were synthesized by the sol-gel self-combustion method conveniently, in which the active metals are uniformly dispersed. 700–1.25Ni 1 Y 1 O α exhibits the best catalytic activity and has the most active metal dispersion (6.15 %). The ammonia conversion can reach 96 % at 550 °C and 12000 ml·g cat −1 ·h −1 gas hourly space velocities (GHSVs) as well as 100 % at 600 °C and the same GHSVs. Temperature-programmed reduction, temperature-programmed desorption, and X-ray photoelectron spectroscopy were used to characterize the catalysts. It was found that 700–1.25Ni 1 Y 1 O α has the best capacity for hydrogen desorption resulting in weakening the inhibitory effect of hydrogen to the reaction and enhancing the reactivity of the catalyst. The electron transfer from Y in Y–O–Ni structure increases gradually as the Ni to Y ratio becomes appropriate, enhancing the alkalinity of the catalyst and electron density around the Ni, which is beneficial to NH 3 decomposition.
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ENERGY & FUELS
·
2023
·
IF 5.3
Huihua Wang,Wenchang Li,Jinhong Wu,Deyong Wang,Dong Hou,Minqi Sheng,Ruiqi Guo
Water splitting through electrolysis has been recognized as a promising solution for the production of hydrogen and oxygen to advance many renewable energy conversion and storage systems, while the key is the innovative exploration of cost-efficient electrocatalysts. Herein, interface-modified Ni–Fe–P/Co–P/NF alloys were achieved through a facile electroless plating strategy, in which the constructed interfaces benefited not only from the strong electron interaction but also from the fast mass transfer, significantly boosting the oxygen evolution reaction and hydrogen evolution reaction catalytic performance. More interestingly, water-splitting cells assembled using Ni–Fe–P/Co–P/NF-5L alloys as the cathode and anode, respectively, only requires a cell voltage of ∼1.52 V at 10 mA cm–2, far lower than that of the integrated Pt–C/NF and RuO2/NF couple (1.61 V). Also, the Ni–Fe–P/Co–P/NF-5L||Ni–Fe–P/Co–P/NF-5L system shows an outstanding durability over a long-term operation of 48 h at 10 mA cm–2. The work demonstrates an innovative strategy to construct heterogeneous interfaces for high-performance electrocatalysts and is suggested to be readily extended to regulate heterogeneous interfaces among other binary and ternary electrocatalysts, such as transition metal phosphides/borides, for scaling up water-splitting technology.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Yuanyuan Luo,Yuanji Xiang,Lirong Qin,Jianwei Zhao,Huiming He,Yuanxin Liu
A MoO 3 -MoS 2 /Ni porous micro/nano array was successfully prepared by two-step electrodeposition using a screen-printed electrode as the substrate and colloidal spheres as a template. Owing to defects in the MoO 3 -MoS 2 micro/nanostructure and the characteristics of the edge active sites, the modified electrode performs well as a non-enzymatic glucose sensor . The sensitivity of the screen-printed electrode modified with MoO 3 -MoS 2 /Ni porous array is 2278 μA mM −1 cm −2 in the linear range of 0.5 μM–2 mM and 1421 μA mM −1 cm −2 in the linear range of 2–5.5 mM, with a low detection limit of 0.2 μM. The structure of the MoO 3 -MoS 2 /Ni porous array electrode is ordered, and the preparation and test procedure are simple. The use of a screen-printed electrode as a substrate confers novelty to the synthesis strategy of the non-enzymatic glucose sensor, with good prospects for commercial application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiayu Xu,Lice Yu,Baoxia Dong,Fulin Yang,Ligang Feng
Developing Ru-based catalysts with both high activity and stability for the oxygen evolution reaction (OER) is very significant in the water electrolysis technique. Here, a bimetallic metal oxide catalyst (RuO 2 -NiO) derived from Ru-coupled Ni metal–organic framework (Ni-MOF) by using terephthalic acid as the ligand was successfully synthesized through a facile ultrasonic treatment and subsequent thermal annealing approach; and the effective role of the coupled effect between RuO 2 and NiO in stabilizing Ru was found significant in OER catalysis. A relatively small d-band center due to the electronic structure regulation and synergistic effect of the heterostructure was found to cause weakened adsorption of surface oxygen species. Theoretical calculations demonstrated that the electronic modulation between RuO 2 and NiO can significantly accelerate the dissociation of water and modulate the chemical adsorption of oxygen intermediates on the catalyst, thereby enhancing the OER activity of the catalyst. The optimized catalyst of RuO 2 -NiO afforded a current density of 10 mA cm −2 at low overpotentials of 210 mV toward OER, and good catalytic stability, kinetics and efficiency were also discussed. This remarkable catalytic performance can be attributed to the unique sheet-like structure and porous morphology of the catalyst with increased exposure of active sites and the coupling effect between RuO 2 and NiO for moderate binding strength to the intermediates. This study showed an effective approach for bimetallic oxide catalyst fabrication and their applications in energy conversion reactions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tiantian Liu,Xiaomei Yu,Shuang Yu,Huijing Yang,Qimeng Sun,Chengduo Wang,Songjie Li,Jin You Zheng
Alkaline water electrolysis techniques have enormous potential for industrial-scale hydrogen generation, but a lack of effective and low-cost bifunctional electrocatalysts capable of steady high-current density operation has hampered progress. Layered double hydroxides (LDHs) have been considered promising OER electrocatalysts, but their poor electrical conductivity impedes hydrogen evolution reaction (HER) activity. Integrating LDHs with transition metal phosphides (TMPs) can potentially achieve bifunctional capability by overcoming individual limitations. Herein, CoP@NiFe LDH/Ni heterostructured catalyst was rapidly synthesized by a scalable two-step electrodeposition method. The integration of NiFe LDH with CoP enhanced its electrical conductivity. Meanwhile, electron transfer occurred from the metal atoms to the more electronegative phosphorus, facilitating phosphorus to act as a proton acceptor and expedite the HER process. Benefiting from the synergistic integration and optimized electronic structure, CoP@NiFe LDH/Ni exhibited excellent alkaline water-splitting performances with low overpotentials of 260 mV for HER and 351 mV for OER at 400 mA/cm 2 . The CoP@NiFe LDH/Ni two-electrode-based alkaline electrolyzer displayed a cell voltage of 2.13 V and stable operation for 100 h at a high current density of 1000 mA/cm 2 . This work elucidates a strategy to tackle critical challenges impeding the design and preparation of high-current-density tolerant bifunctional electrocatalysts.
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Batteries & Supercaps
·
2023
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IF 5.7
Jiaquan Liu,Zitong Ding,Qiuman Zhou,Lanfei Wei,Yurong Yan
Graphical Metal selenides/biomass derived carbon composite (Ni,Co)Se/BLC was prepared from banana leaves through carbonization and hydrothermal reaction. The metal selenides provide high pseudo-capacitance and the hierarchical porous structure of activated carbon promotes the uniform distribution of them. The prepared composite shows excellent electrochemical properties as supercapacitor electrode. Modification with transition metal compounds is an effective strategy to improve the capacitance of biomass derived carbon. In this work, high-performance (Ni,Co)Se/banana leaves derived carbon ((Ni,Co)Se/BLC) composite with 3D porous structure was prepared by two-step carbonization and subsequent hydrothermal reaction process. The prepared (Ni,Co)Se/BLC exhibits a high specific capacitance of 840.6 F/g at a current density of 1 A/g, which is more than five times comparing with the carbon matrix. Asymmetric supercapacitor, assembled with the (Ni,Co)Se/BLC composite as the positive electrode and BLC as the negative electrode, exhibits a wide potential window of 1.5 V, delivers a high energy density of 34.3 Wh/kg at a power density of 749.8 W/kg, and the power density can reach 7500 W/kg at the energy density of 19.4 Wh/kg. The results reveal that the modification of metal selenide can greatly improve the electrochemical properties of biomass derived carbon, which is significant for the application of biowaste in supercapacitor electrode materials.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2023
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IF 2.7
Zhongying Fang,Xiaolong Liang,Lehui Lu,Wei Chen
The electrocatalytic oxidation of urea (EOU) is an important half-reaction in water splitting, urea fuel cells, and urea wastewater treatment. The anions of nickel-based catalysts can be leached severely in the oxidation potential range. Therefore, the influence of anion on the electrocatalytic performance of Ni(OH) 2 /NiOOH for urea oxidation has not been systematically studied. The present experimental results show that the structure reconstruction of catalyst is a complicated process, specifically including deep penetration by alkaline electrolyte, leaching-induced oxidation by phosphorus or sulfur anions, transformation or cracking of the original structure, and formation of an amorphous layer on the surface. The reconstructed NF-NiP x -R or NF-NiS x -R has a three-layer core-shell structure, with a nickel foam skeleton in the innermost layer, an amorphous NiP x or NiS x layer in the middle layer, the outermost layer of oxygen-containing anion (PO x or SO x ) coordinated Ni(OH) 2 . In the prepared catalyst, the Ni(OH) 2 /NiOOH redox is the real catalytic species for the urea oxidation. It is found that the oxygen-containing anion can enhance the catalytic performance of the Ni(OH) 2 /NiOOH redox, and PO x anion has the best enhancing effect. It is found that the urea molecules are oxidized on the electrocatalyst surface mainly through an indirect pathway.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 9
·096501
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IF 3.9
Kangli Chen,Yuan Li,Guanjiu Wu,Qing Wang,Chenfeng Fan,Lu Zhang,Jianzheng Song,Shumin Han
Designing Earth-abundant, cost-effective catalysts for hydrogen evolution via water splitting is essential for hydrogen generation. Adding a third metal element to binary phosphides provides the opportunity to tune their morphology, crystalline and electronic structures and thus their electrocatalytic properties. In this study, a hierarchical crystalline/amorphous Ni−Co−P compound is prepared on nickel foam (NF) with different nickel to cobalt ratio by one-step electrodepositing technique. The Ni−Co−P/NF is composed of metallic Co and amorphous phosphides. It has hierarchical morphology, consisting of ∼800 nm spherical particles in the bottom layer, ∼1.5 μm spherical particles in the middle layer, and staggered network structure on the top layer. The Ni−Co−P/NF electrode exhibits superior hydrogen evolution reaction (HER) catalytic activity in the alkaline solution, which requires only 72 mV for delivering 10 mA cm−2. More importantly, the Ni−Co−P/NF catalyst sustains the current density of 20 mAcm−2 for 53 h with negligible degradation in overpotential which shows remarkable electrochemical stability.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
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IF 10.9
Songyu Yang,Kailin Wang,Qiao Chen,Yan Wu
S-scheme heterostructure photocatalysts can achieve highly efficient solar energy utilization. Here, single-atom Ni species were deposited onto TiO 2 /g-C 3 N 4 (TCN) composite photocatalyst with an S-scheme heterojunction for highly efficient photocatalytic water splitting to produce hydrogen. Under solar irradiation, it realized the hydrogen production activity of 134 µmol g –1 h –1 , about 5 times higher than the TCN without atomic Ni. In-situ Kelvin probe force microscopy characterization and the density functional calculation certify that by forming the S-scheme heterojunction, the photo-excited electrons from the TiO 2 combine with the photogenerated holes at the coupled g-C 3 N 4 driven by a built-in electric field. More importantly, the single-atom Ni species stabilized the photogenerated electrons from the g-C 3 N 4 could effectively enhance the charge separation between the holes on the valence band of TiO 2 and electrons at the conduction band of g-C 3 N 4 . Meanwhile, the Ni atoms act as the surface catalytic centers for the water reduction reaction, which greatly improves the reactivity of the photocatalyst. The present work provides a new approach for developing noble metal-free heterojunctions for high-efficiency photocatalysis.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Baochun Wang,Haorong Chen,Zilong Wang,Zhaoqing Jin,Anbang Wang,Yaqin Huang,Weikun Wang
Lithium-sulfur batteries (LSBs) are promising candidates as next-generation secondary batteries due to their advantages with respect to cost and energy density. However, their practical application is hindered by their slow kinetics and the shuttle behavior of soluble polysulfide ions. Herein, we successfully prepared a three-dimensional porous conductive catalyst material with an atomic-level Ni–N 4 structure. The results showed that a strong adsorption of lithium polysulfides (LiPSs) by the Ni–N 4 catalytic active sites and a strong catalytic effect on the conversion of LiPSs in the sulfur reduction reaction (SRR) as well as the lithium sulfide oxidation reaction (SOR) were achieved, effectively inhibiting the shuttle effect of polysulfide ions and promoting the sulfur cathode kinetics process. Thus, the LSBs exhibited an excellent performance with a specific capacity of 829.8 mAh g –1 and an average coulombic efficiency of 98.8 % after 420 cycles at a high rate of 1 C. Our work provides new insights and novel efforts to solve the shuttle effect in LSBs.
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CATALYSIS COMMUNICATIONS
·
2020
·
IF 3.612
Haohua Jin,Jiasheng Wang,Wan-Hui Wang,Yang Li,Ming Bao
The utilization of CO 2 is nowadays important for alleviating energy and environmental crisis. Herein, amino-functionalization was used to improve the performance of SiO 2 -supported Ni-ZnO nanocatalyst for the hydrogenation of sodium bicarbonate to formic acid . The activity, stability and retainability were all improved upon the introduction of amino group. A formic acid yield of 30.4% was obtained from sodium bicarbonate when passing 5 vol% H 2 /N 2 at 70 °C for 4.5 h, which is considered among the best catalytic performances reported under ambient pressure. The simultaneous improvement of the three aspects through a simple operation is attractive in the field of catalysis.
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