JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Liu,Wenyu Tan,Yang Yang,Hanwei He
Efficient, stable, and environmentally friendly electrocatalysts urgently need to be explored for hydrogen evolution reaction (HER). A novel and facile nickel–selenium–dysprosium (Ni–Se–Dy) electrocatalyst was synthesized on Ni foam via simple and feasible one–step galvanostatic electrodeposition . The prepared Ni–Se–Dy electrodes showed excellent HER activity in alkaline medium with low overpotential values of 72 and 173 mV to deliver the current density values of 10 and 50 mA·cm −2 . Tafel slope value (119.72 mV·dec −1 ) for Ni–Se–Dy electrode in 1.0 M KOH indicated that the Ni–Se–Dy catalyst followed a Volmer–Heyrovsky mechanism, and the rate–determining step of this reaction was a Volmer step. Electrochemical test and scanning electron microscopy results showed that the excellent HER performance of Ni–Se–Dy electrode can be attributed to surface morphology , better intrinsic activity, and high conductivity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Shuochao You,Yihui Wu,Yuxin Wang,Zhen He,Li Yin,Yuan Zhang,Zesheng Sun,Zejie Zhang
The development of extremely active bifunctional non-noble electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is pivotal for water splitting but remains challenging. Herein, self-supported Ni–Fe–Sn electrocatalysts were fabricated on nickel foam (NF) through a simple and facile pulse electrodeposition process. Under optimal conditions, the prepared Ni–Fe–Sn electrocatalysts exhibited excellent bifunctional properties in alkaline medium and required ultralow overpotentials of only 27 and 201 mV for HER and OER, respectively, to reach the current density of 10 mA cm −2 . Importantly, the same Ni–Fe–Sn electrocatalyst can be assembled as the anode and the cathode in a two-electrode system. It demanded a fairly low applied voltage of 1.55, 1.72, and 1.87 V to produce 10, 50, and 100 mA cm −2 , respectively, and exhibited excellent long-term stability. The excellent electrocatalytic water splitting performance of the Ni–Fe–Sn film was mainly associated with its intrinsic catalytic activity derived from the modulation of the electronic structures among Ni, Fe, and Sn by using the appropriate atomic ratio of Ni: Fe: Sn.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guoguo Wang,Qiuyue Chen,Jing Zhang,Xuguang An,Qian Liu,Lisi Xie,Weitang Yao,Xunping Sun,Qingquan Kong
As an eco-friendly and sustainable strategy, the electrochemical reduction of nitrite (NO 2 – ) can simultaneous generation of NH 3 and treatment of NO 2 – contamination in the environment. Herein, monoclinic NiMoO 4 nanorods with abundant oxygen vacancies self-supported on Ni foam (NiMoO 4 /NF) are considered high-performance electrocatalysts for ambient NH 3 synthesis by reduction of NO 2 − , which can deliver an outstanding yield of 18089.39 ± 227.98 μg h −1 cm −2 and a preferable FE of 94.49 ± 0.42% at −0.8 V. Additionally, its performance remains relatively stable during long-term operation as well as cycling tests. Furthermore, density functional theory calculations unveil the vital role of oxygen vacancies in promoting nitrite adsorption and activation, ensuring efficient NO 2 – RR towards NH 3 . A Zn-NO 2 – battery with NiMoO 4 /NF as the cathode shows high battery performance as well.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Peng Zuo,Xujing Ji,Jiawei Lu,Yating Chai,Weizhou Jiao,Ruixin Wang
Developing the robust non-precious metal bifunctional electrocatalyst is highly imperative for the hydrogen evolution from overall water splitting. Herein, a Ni foam (NF)-supported ternary Ni/Mo bimetallic complex (Ni/Mo-TEC@NF), hierarchically constructed by coupling the in-situ formed MoNi 4 alloys and Ni 2 Mo 3 O 8 with Ni 3 Mo 3 C on NF, has been developed through a facile method involving the in-situ hydrothermal growth of the Ni-Mo oxides/polydopamine (NiMoO x /PDA) complex on NF and a subsequent annealing in a reduction atmosphere. Synchronously, N and P atoms are co-doped into Ni/Mo-TEC during the annealing procedure using phosphomolybdic acid and PDA raw materials as P and N sources, respectively. The resultant N, P-Ni/Mo-TEC@NF shows outstanding electrocatalytic activities and tremendous stability for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), due to the multiple heterojunction effect-promoted electron transfer , the large number of exposed active sites, and the modulated electronic structure by the N and P co-doping. It only needs a low overpotential of 22 mV to afford the current density of 10 mA·cm −2 for HER in alkaline electrolyte . More importantly, as the anode and cathode, it requires only 1.59 and 1.65 V to achieve 50 and 100 mA·cm −2 for overall water splitting, respectively, comparable to the benchmark Pt/C@NF//RuO 2 @NF couple. This work could spur the search for economical and efficient electrodes by in situ constructing multiple bimetallic components on 3D conductive substrates for practical hydrogen generation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Lei Tan,Jiangtao Yu,Haiyan Wang,Hongtao Gao,Xien Liu,Lei Wang,Xilin She,Tianrong Zhan
NiSe 2 /Ni 3 Se 4 dual-phase electrocatalysts are synthesized by calcining the Ni(OH) 2 nanosheets on Ni foam and Se powder under an N 2 atmosphere. The Ni’s charge-state, phase compositions, and electrocatalytic performances are dependent on the initial mass ratios of Ni to Se. The experimental results demonstrate that the electrocatalyst with a higher Ni charge-state and more Ni 3 Se 4 phase facilitates oxygen evolution reaction (OER), whereas the one with a lower Ni charge-state and more NiSe 2 phase boosts hydrogen evolution reaction (HER). Density functional theory calculations reveal that the interfacial electrons transfer from Ni 3 Se 4 to NiSe 2 , which improves conductivity and optimizes adsorption/desorption energies. NiSe 2 /Ni 3 Se 4 /NF-4 containing more NiSe 2 phase displays the best HER activity while NiSe 2 /Ni 3 Se 4 /NF-1 containing more Ni 3 Se 4 phase shows the best HER activity. The electrolyzer, employing NiSe 2 /Ni 3 Se 4 /NF-4 and NiSe 2 /Ni 3 Se 4 /NF-1 as the cathode and anode, respectively, performs the full potential and demonstrates a low voltage of 1.56 V achieving 10 mA cm −2 with good durability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Zejie Zhang,Yihui Wu,Deping Zhang
The hydrogen evolution reaction (HER) using earth-abundant noble-metal-free catalysts has gained substantial interest in electrocatalytic water splitting technologies, particularly in water-alkali electrolyzers. The development of highly-efficiency and durable inexpensive electrocatalysts to accelerate the kinetics of HER is still a formidable challenge. In this study, nickel–iron (Ni–Fe) electrocatalyst directly grown on backbones of Ni foam (NF) substrate was facile prepared via one-step potentiostatic electrodeposition method. The obtained Ni–Fe electrocatalyst exhibits a film-like structure. Owing to high electrical conductivity and composition optimization, the synthesized Ni–Fe electrocatalyst with Ni/Fe atomic ratio of c.a. 65:35 possesses an attractive electrocatalytic activity with low overpotentials of 142, 205, and 239 mV at 10, 50, and 100 mA·cm −2 in alkaline electrolyte , respectively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Haiyu Wang,Linghui Peng,Guiying Li,Hongli Liu,Zhishu Liang,Huijun Zhao,Taicheng An
Catalytic ozonation is a promising bioaerosol control technology, as O 3 is prevalent in atmosphere. However, O 3 at atmosphere concentration has limited oxidation potential and reactive oxygen species (ROSs) production, leading incomplete bioaerosol inactivation. Therefore, a catalytic ozonation system with a manganese dioxide/Ni foam (MN) was prepared for efficient bioaerosol inactivation. The MN exhibited superior activity in catalytic ozonation bioaerosol inactivation, achieving 91.6% inactivation efficiency within 8.07 s at atmospheric concentration (0.1 ppm) of O 3 . The inactivation efficiency can be further improved to 99.0% by regulating surface oxygen vacancies (O V ) in MN, which is mainly attributed to abundant O V of MN that facilitate rapid conversion of O 3 to other ROSs. Meanwhile, the mechanism of rapid bacterial inactivation was also clarified at cellular level, showing that ROSs caused bacterial oxidative stress. This catalytic ozonation strategy would offer more choices to design efficient O 3 catalysts for bioaerosol control and public health protection.
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Journal of Environmental Sciences
·
2021
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IF 5.565
Jingwei Hao,Shen Zhao,Ran Mao,Xu Zhao
The direct urea fuel cell (DUFC) is a low cost and competitive approach for contemporaneous urine or urea-contaminated wastewater treatment and electricity generation. However, the lack of efficient urea oxidation reaction (UOR) electrocatalysts and suitable electron acceptors remains a challenge for practical applications. Here, we developed a DUFC system using Ni 2 P@Ni foam as the anode and peroxymonosulfate (PMS) as the chemical oxidizers . The Ni 2 P@Ni foam anode showed a high oxidation activity for UOR with an onset potential of 0.30 V vs. Ag/AgCl and Tafel slope of 34.4 mV/dec. PMS with high theoretical potential improved the cell voltage to 1.43 V. A power density of DUFC up to 4.91 mW/cm 2 was achieved using PMS at room temperature, which was approximately twice as high as using H 2 O 2 (2.38 mW/cm 2 ). Ni II /Ni III was the redox active species on the Ni 2 P anode in the DUFC process, and Ni II was electrochemically oxidized to Ni III , which reverted to Ni II by urea reduction. When real human urine was used as the fuel, a power density of 4.46 mW/cm 2 can be achieved at room temperature. This DUFC with high cell performance showed potential application in urea wastewater treatment.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yu Huang,Yihui Wu,Zejie Zhang,Lanlan Yang,Qianhao Zang
Exploring cost-effective and high-efficiency noble-metal free electrocatalysts for oxygen evolution reaction (OER) are of critical importance to the area of renewable energy storage and conversion systems. Herein, Ni–Fe–Mo films were fabricated via electrodeposition method with a very high current density. The film exhibits excellent activity towards OER with a overpotentials of 306 mV at current density of 10 mA·cm −2 and a lower Tafel slope of 77.1 mV·dec −1 under alkaline conditions (30 wt.% KOH). The synergistic effect of the Mo, Ni, and Fe contribute the improved catalytic activity for OER.
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Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 9
·1484-1492
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IF 4.056
Muheng Wang,Yun Wu,Na Li,Fei Zhao,Qiang Zhao,Jinping Li,Guang Liu
Graphical Benefiting from synergistic effects between a NiFe layer and CoS film, the obtained heterostructure CoS@NiFe/NF electrocatalyst displayed excellent oxygen evolution reaction activities at high current densities towards water splitting. Electrochemical water splitting is an ideal pollution-free path to generate hydrogen at large scale, however, the development of highly catalytic electrocatalysts for the water oxidation reaction at large current densities is still a fundamental challenge. Herein, we report a novel, high-wettability water-oxidation electrocatalyst composed of an amorphous NiFe layer and CoS film on commercial nickel foam via a two-step electrodeposition synthetic path. Benefiting from the strong interactions between the NiFe layer and CoS film, enlarged surface active sites and enhanced wettability, the CoS@NiFe/NF electrode exhibited an outstanding water oxidation performance at 10 mA/cm 2 with an overpotential of 175 mV in 1 M KOH solution and steadily delivered a current density of 1 A/cm 2 at merely 330 mV in 30 wt% KOH solution. Even at large densities, the CoS@NiFe/NF hybrids also showed excellent water oxidation stability and corrosion resistance for at least 24 h. Such a synergistic assembling approach to fabricate a CoS@NiFe/NF heterostructure together with excellent OER performance may be a promising strategy for rationally building and designing heterostructural electrocatalysts towards highly efficient water oxidation reaction.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yinghao Li,Hongjie Yu,Ziqiang Wang,Songliang Liu,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Control synthesis of self-standing porous bimetallic nanosheet array is of significant importance for electrocatalytic applications. Herein, we report an in-situ approach for directly fabricating interweaved porous palladium-ruthenium nanosheets on Ni foam (PdRu NS-NF) via a micelle-assisted galvanic replacement reaction using Ni foam as both the reductant and substrate. These nanosheets possess interconnected porosity and bimetallic compositions , which provide abundant active sites and strong electronic effect. The binder-free PdRu NS-NF shows outstanding activity and stability for electrocatalytic nitrogen reduction to ammonia. Different from traditional complex methods for the fabrication of metallic nanosheets, the proposed approach is very feasible to directly synthesize metallic array with tunable morphology and composition on three-dimensional metallic substrates.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Fanghui Wang,Yimeng Luo,Yanan Wang,Hong Zhu
In this work, a spherical spider web-like structure Ru Ni/Ni foam catalyst was prepared for hydrogen evaluation from sodium borohydride (NaBH 4 ) by a combination of electroless plating and electroplating. Microstructure, surface morphology , surface area and elemental composition of the Ru Ni/Ni foam catalyst were analyzed by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM-EDS and X-ray Photoelectron Spectroscopy (XPS), Brunauere-Emmette-Teller method (BET, AS-1C-VP), respectively. The influences of Ru Ni with different molar ratios , NaOH concentration, NaBH 4 concentration, and solution temperature on the hydrogen production rate were investigated in this paper. The results showed that the Ru Ni metals were arrayed densely and uniformly on the surface of Ni foam. The average hydrogen production rate is 360 mL min −1 g −1 in 20 wt % of NaBH 4 , 1 wt% of NaOH at 30 °C in the presence of the Ru Ni/Ni foam catalysts. The calculated activation energy was 39.96 kJ mol −1 for hydrogen production from sodium borohydride using the Ru Ni/Ni foam catalyst.
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