Green Processing and Synthesis
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2024
·Vol. 13
·期 1
·
IF 3.8
Bo Yu,Yan Li,Xiang-Nan Fu,Lei Yu,Hu-Dai Fu,Yan-Xin Cao,Zhi-Hong Chen
The energy and environmental crisis pose a great challenge to human development in the 21st century. The design and development of clean and renewable energy and the solution for environmental pollution have become a hotspot in the current research. Based on the preparation of transition metal phosphates, transition metals were used as raw materials, Prussian blue-like NiFe(CN) 6 as a precursor, which was in situ grown on nickel foam (NF) substrate. After low temperature phosphating treatment, a bimetallic phosphide electrocatalyst (NiFe) 2 P/NF was prepared on NF substrate. Using 1 mol·L −1 KOH solution as a basic electrolyte, based on the electrochemical workstation of a three-electrode system, the electrochemical catalytic oxygen evolution performance of the material was tested and evaluated. Experiments show that (NiFe) 2 P/NF catalyst has excellent oxygen evolution performance. In an alkaline medium, the overpotential required to obtain the catalytic current density of 10 mA·cm −2 is only 220 mV, and the Tafel slope is 67 mV·dec −1 . This is largely due to: (1) (NiFe)2p/NF nanocatalysts were well dispersed on NF substrates, which increased the number of active sites exposed; (2) the hollow heterostructure of bimetallic phosphates promotes the electron interaction between (NiFe) 2 P and NF, increased the rate of charge transfer, and the electrical conductivity of the material is improved; and (3) theoretical calculations show that (NiFe) 2 P/NF hollow heterostructure can effectively reduce the dissociation barrier of water, promote the dissociation of water; furthermore, the kinetic reaction rate of electrocatalytic oxygen evolution is accelerated. Meanwhile, the catalyst still has high activity and high stability in 30 wt% concentrated alkali solution. Therefore, the construction of (NiFe) 2 P/NF electrocatalysts enriches the application of non-noble metal nanomaterials in the field of oxygen production from electrolytic water.
研究领域:
材料科学
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电化学
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chun Kong,Chuang Zhi,Zirui Wu,Wenqiang Yang,Juan Yang,Zhongti Sun
NiFe-(oxy)hydroxides are the most active transition metal oxide electrocatalysts for oxygen evolution reaction (OER) under the alkaline media. Herein, we controllably manipulated oxygen vacancy (V O )-tunable NiFe-(oxy) hydroxides that their OER performances possessed a volcano-type relationship with V O concentration, positively-correlated with Ni 3+ /Ni 2+ ratio. Theoretical simulations further unearthed the enhanced activation and dissociation of H 2 O by the inserting of V O . As a result, the optimal sample featuring the Ni 3+ /Ni 2+ ratio of 30.3 % and V O of 23.8 % exhibited the overpotential of 243 mV at the current density of 100 mA cm –2 , simultaneously lasting 120 h durability without any attenuation, exceding the most reported NiFe-(oxy)hydroxides. This work offers an innovative view to understand the OER performance using hypervalent Ni ratio induced by V O defects.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yajing Hu,Yong Men,Shuyi Xu,Yuanfen Feng,Jinguo Wang,Kaijie Liu,Yibo Zhang
Constructing the interface of Ni/Y 2 O 3 heterogeneous catalyst is a feasible strategy for efficient catalyst design in CO 2 methanation, which can create the active Y–O–Ni interfacial sites by utilizing the interaction between Ni and Y 2 O 3 . In this work, the strategy of using different nickel precursors (nickel nitrate, nickel acetate, basic nickel carbonate and nickel citrate) was used to prepare various Ni-based catalysts supported on Y 2 O 3 , which were estimated for their catalytic performance on CO 2 methanation. The catalysts were characterized based on BET, XRD, TEM, H 2 -TPR, XPS and CO 2 -TPD, etc. The results indicated a close correlation between the metal dispersion and particle size of Ni/Y 2 O 3 catalysts and the nickel precursor employed. The Y–O–Ni interface structure in Ni/Y 2 O 3 catalysts, associated with basic sites, provides a richer source of basic sites, offering more active sites for CO 2 adsorption and activation. Ni/Y 2 O 3 catalyst prepared with nickel nitrate as the precursor exhibited characteristics such as a highly enhanced nickel dispersion, a smaller nickel particle size, and more abundant metallic Ni 0 sites. Moreover, nickel nitrate-derived Ni/Y 2 O 3 catalyst exhibited optimal catalytic activity, achieving a CO 2 conversion rate of up to 92 % at 300 °C, with 100 % selectivity to CH 4 , and displaying good stability over 30 h. Therefore, the dispersion of Ni and the size of Ni particles could be controlled by adjusting the precursor, which is closely associated with the catalytic activity of Ni/Y 2 O 3 catalyst. This work unveils the interface-property relationship of Ni/Y 2 O 3 catalysts and provides a new insight into strategy of constructing more effective Ni-based catalyst for CO 2 methanation through the controlled nickel precursor.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Juan Wen,Haodong Sun,Qi Zhou,Zaichun Liu,Ting Huang,Xi Chen,Xiaoyan Yang,Qinghong Huang,Yuhui Chen,Yuping Wu
Ammonia as a chemical substance is closely related to our daily life, and its production process has attracted researchers' attention. Due to its high energy consumption and high emission characteristics, the industrial Haber−Bosch process obviously cannot adapt to the sustainable development concept of low-carbon and environmental protection in today's society. The electrocatalytic nitrogen reduction reaction (NRR) technology is a promising method of converting unstable electrical energy into fuel for storage at ambient conditions. Here, a bimetallic catalyst, Co–Ni–S/Ni foam, is reported as an electrocatalyst to realize N 2 reduction. The in-situ growth strategy promotes the effective combination of Co 9 S 8 and Ni 3 S 2 on the Ni foam without any adhesive. The active centers of the bimetallic Co and Ni reasonably regulate the adsorption of various complex intermediates in the N 2 activation process, so that the Co–Ni–S/Ni foam has good N 2 activity. In 0.1 M Na 2 SO 4 , the designed electrocatalyst achieved an NH 3 yield of 5.05 × 10 −10 mol s −1 cm −2 at −0.6 V vs. RHE and an optimum Faradaic efficiency of 6.23% with good electrochemical stability and selectivity. Besides, the electrocatalytic sites were also evaluated in conjunction with density functional theory.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yanyan Wu,Ying Li,Mengke Yuan,Zhe Lü,Lingling Xu,Bo Wei
Developing efficient and nonprecious electrocatalysts for oxygen evolution reaction (OER) is crucial for the hydrogen generation via water splitting. Here we report the direct growth of heterostructural Ni 2 P–Fe 2 P hybrid electrocatalysts on NiFe foams. The redox engineered NiFe foam (rNF) significantly enhances the OER performance. Among prepared catalysts, Ni 2 P–Fe 2 P/rNF performs the highest OER activity, driving the current densities of 10 and 100 mA cm −2 at low overpotentials of 218 and 270 mV in 1 M KOH, respectively. Meanwhile, it can maintain 100 mA cm −2 for 24 h without obvious degradation. The morphology and composition of NFP/rNF after OER test were carefully studied. This work suggests that self-supported bimetal phosphides of NFP/rNF is an efficient and durable electrode material for water oxidation .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Bowen Lu,Yanhui Wang,Wei Li,Shiwei Song,Pengfei Tian,Rushuo Li,Xueqing Tian,Xiangyu Liu,Jianbing Zang
The development of self-supporting electrodes that exhibited both high efficiency and good durability remained a challenge in the field of hydrogen energy utilisation. Here, we designed a self-supporting 3D hierarchical porous electrode by filling carbon nanotubes (CNTs) loaded with Ni–P alloy into the framework of nickel foam (NF). Firstly, CNTs were decorated with a catalytically active Ni–P alloy via electroless plating (Ni–P@CNTs). Then, the Ni–P@CNTs were filled and anchored onto the framework of NF via electroplating to synthesise a self-supporting electrode (Ni–P@CNTs/NF). The Ni–P@CNTs/NF exhibited an excellent catalytic performance toward the hydrogen evolution reaction (HER) in 1 M KOH electrolyte, with an overpotential of 53 mV at 10 mA cm −2 , a small Tafel slope of 101.56 mV dec −1 and excellent long-term durability. This facile and effective strategy might provide a new path to the design of self-supporting electrodes with enhanced HER catalytic.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xueying Cao,Dedong Jia,Da Li,Liang Cui,Jingquan Liu
Considering the synergistic effect of transition metal phosphides and 3D structure substrates, herein, we directly deposited well-defined hierarchical radial Ni x P nanospheres on Ni foam via a facile, one-step co-electrochemical method to function as highly active flexible electrodes for both hydrogen evolution reaction and supercapacitor. Impressively, the bifunctional Ni x P/NF electrode requires an overpotential of only 63 mV to achieve a current density of 10 mA cm −2 and demonstrates a low Tafel slop of 55 mV dec −1 in 1 M KOH. Moreover, the electrochemical supercapacitor based on this hierarchical Ni x P/NF electrode also shows a superior specific capacitance of 1684 mF cm −2 (382.7 F/g) at a current density of 2 mA cm −2 and an outstanding retention ratio of 110.9% of its original capacitance value after 4000 cycles in 6 M KOH. Hopefully, excellent electrochemical performances demonstrate that this Ni x P/NF material could be a promising candidate for future applications in both hydrogen evolution reactions and supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yun Zhou,Shengqi Xi,Xigang Yang,Hongjing Wu
Conductivity and morphology are the two important factors affecting the performance of electrocatalysts . In this article, a facile two-step hydrothermal process was developed to grow Co 9 S 8 -Ni 3 S 2 nanoarrays on nickel foam (Co 9 S 8 -Ni 3 S 2 NAs/NF). The as-obtained catalyst possessed a novel morphology, in which the Co 9 S 8 nanoneedles were surrounded by Ni 3 S 2 ultrathin nanosheets . The resultant Co 9 S 8 -Ni 3 S 2 nanoarrays not only permitted more exposures of active sites but also facilitated the charges and ions transport along the nanoarrays. Moreover, both Co 9 S 8 and Ni 3 S 2 exhibited metallic properties allowed the catalysts with conductivity (metallic conductor vs. semiconductor). Co 9 S 8 -Ni 3 S 2 NAs/NF exhibited excellent electrocatalytic activities for both HER and OER in 1.0 M KOH solution. To reach a large current density of 100 mA cm −2 , it only required overpotentials of 204 mV and 346 mV for HER and OER, respectively. After long-term electrolysis, the high activities were still preserved. This work indicates efficient electrocatalysts can be obtained by the rational design of the heterostructure , which sheds some light on the development of noble metal-free electrocatalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 105
·103585-103593
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IF 3.289
Junfeng Zhao,Jiachen Zha,Hongbin Lu,Cheng Yang,Kou Yan,Xiangkang Meng
Cauliflower-like nickel alkoxide, Ni/NiO and NiO architectures were synthesized via a reflux route using NaBH4–EG as alkaline precipitant. The as-prepared powders were characterized by XRD, FESEM, TEM, HRTEM, and N2 adsorption/desorption isotherms. The results show that the nickel alkoxide is made up of smooth spherical building blocks with diameters of about 500 nm that aggregate interactively to form whole 3D structures. The Ni/NiO and NiO architectures can be obtained by the direct thermal transformation from nickel alkoxide precursor at 300 °C and 600 °C, respectively, which are assembled by nanoparticles and composed of mesopores and macropore. The as-prepared three samples exhibit excellent performance for the removal of Congo red (CR) and Cr(VI) pollutant from aqueous solutions due to their hierarchical structures and high specific surface areas. The corresponding adsorption process fits well with the pseudo-second-order kinetics model and the Langmuir model. Compared with nickel alkoxide and NiO, Ni/NiO architectures show the highest adsorption performance, with the maximum capacity of 642.37 and 92.52 mg g−1 for CR and Cr(VI), respectively. Further, the easily magnetic separation and reused clearly suggests that the Ni/NiO architectures can be explored as an excellent adsorbent for the removal of organic dye and heavy metal ions from aqueous solutions.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 4
·405-409
·
IF 1.852
Xiandong Dou,Weijun Liu,Qing Liu,Zhiqiang Niu
An electrocatalyst of nickel phosphide (Ni 2 P) nanorod arrays vertically grown on Ni foam composite (NNFC) was prepared successfully using NaH 2 PO 2 as phosphorus source by means of a facile method of in situ phosphorization of Ni foam. The as-prepared NNFC exhibits excellent HER performance with an onset overpotential of 100 mV, a small Tafel slope of only 55 mV/dec, and a low overpotential involving 200 mV at a current density of 10 mA•cm −2 . Furthermore, the electrocatalyst was also demonstrated to possess high stability with a neglectable decrease in activity even after durability test for 25 h.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Qiyuan Zheng,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
Direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) is a bottleneck issue in the hydrometallurgy processes of laterite-nickel ore, spent batteries, and other secondary sources. One of the biggest challenges in achieving direct extraction of Ni(II) is the lack of stable and efficient extractants. Hence, a novel bipyridine extractant MSL211 was designed and synthesized in this paper. With its strong steric resistance and electrostatic interaction, MSL211 can form a stable eight-membered chelating ring with Ni(II), thereby having a high bonding ability toward Ni(II). Therefore, based on the high bonding ability of MSL211 toward Ni(II) and the low extraction capacity of DNNSA for Fe(III), an efficient synergistic extraction system of DNNSA-MSL211 was proposed. The synergistic extraction system of DNNSA-MSL211 realizes direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) without neutralization, precipitation, and solid/liquid separation processes, which are inevitable but problematic processes in the current hydrometallurgy processes for removing Fe(III), Al(III), and Mn(II). The effects of the molar ratios of DNNSA:MSL211, shaking time, temperature, O/A ratios, and equilibrium pH on the extraction behavior of Ni(II) were investigated. Under optimum conditions, the extraction efficiency of Ni(II) was as high as 97.62%, and the separation coefficient of Ni(II) over all impurities was greater than 400. To elucidate the mechanism of the high selectivity of DNNSA-MSL211 toward Ni(II), DFT calculations were carried out to calculate the binding energy (ΔE) and Gibbs free energy (ΔG(ext)) of the extraction process. Furthermore, this paper investigated the entire ″extraction-stripping″ process, demonstrating that the synergistic extraction system of DNNSA-MSL211 avoids neutralization, precipitation, and solid/liquid separation processes, minimizes hazardous waste generation, and shortens process flow while meeting the objectives of sustainable and clean production.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Hongyan Zhang,Tao Yang,Hao Zhou,Yikai Wang,Xuehan Yang,Wenjie Liang,Dan Wu,Pan Yuan,Tingting Yu,Maoshuai He,Wenxian Wei
Ni phosphides have recently attracted considerable attention as promising catalysts for the oxygen evolution reaction (OER) and are generally promoted by Fe incorporation. However, the catalytic performance of nickel phosphide still does not meet the desired expectations. Additionally, the catalytic activity of iron (Fe) is insignificant and can be disregarded. In this study, we used C 3 N 4 as a carbon substrate to modulate the 3 d electron configurations and adsorption properties of Ni and Fe. Density functional theory (DFT) analysis reveals that the catalytic performance of Ni sites can be enhanced by utilizing the C 3 N 4 substrate. Surprisingly, the Fe sites can also be activated to catalyze OER through a direct O 2 mechanism and the catalytic activity of Fe is found to surpass that of Ni. As a result, the FeNi-C 3 N 4 -P catalyst demonstrated remarkable catalytic performance for OER. It exhibited a Tafel slope of 40.4 mV dec −1 , an overpotential of 235 mV at 100 mA cm −2 , and exhibited exceptional stability. This study highlights the activation of Fe and the enhancement of Ni by utilizing nitrogen-containing carbon substrates. This strategy offers promising prospects for the development of efficient Ni/Fe-based OER catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）