Chemistry-An Asian Journal
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2024
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IF 3.5
Yicheng Wang,Qiyu Zhang,Chenxu Wang,Ayeza,Yating Zhang,Chao Hu
The utilization of renewable energy for electrocatalytic carbon dioxide reduction reaction (CO 2 RR) represents a pivotal technology in sustainable carbon conversion. Single-atom catalysts (SACs) featuring transition metal-nitrogen-carbon (M−N−C) structures have demonstrated exceptional electrocatalytic efficacy in CO 2 RR by maximizing atom efficiency. Nevertheless, further investigation is warranted to optimize the catalytic performance of SACs through the selection of suitable carbon sources and supports, as well as the modulation of the microenvironment surrounding individual metal atoms. In this study, a sulfur-doped Ni−N−C catalyst was prepared using a two-step strategy involving metal ion adsorption and thermal decomposition, with porous ion exchange resin serving as the carbon source. Due to the uniform distribution of single atom active centers on the resin-based carbon support and sulfur doping, this catalyst efficiently converts CO 2 into CO with a Faradaic efficiency exceeding 90 % within the range of −0.69~−1.29 V (vs. RHE), reaching a maximum value of 97.7 % (−0.79 V vs. RHE). Theoretical calculations indicate that second-shell sulfur doping effectively promotes coupled transfer of protons and electrons, leading to a significant reduction in Gibbs free energy barriers for CO 2 RR intermediate products.
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JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Wenwu Zhao,Xionghuan Yang,Ying Gu,Siqing Li,Yanqiang Hu,Yanfeng Tang,Minmin Wang
The development of highly efficient and stable electrocatalysts is crucial for the practical application of water splitting in renewable energy production. The Ni-Fe Phosphate electrocatalyst was synthesized through a simple and scalable electrodeposition method. This study presents a comprehensive investigation into the surface reconstruction engineering of an amorphous Ni-Fe phosphate electrocatalyst for enhancing its performance in alkaline water splitting. The reconstructed electrocatalyst exhibits significantly improved activity in alkaline water splitting. As expected, a low cell voltage of 1.86V was used to drive water splitting at 300 mA cm −2 , while the electrodes maintained high stability during 180 h continuous full water splitting at 70 mA cm −2 . This work provides insights into the mechanisms underlying the enhanced performance of the reconstructed Ni-Fe Phosphate based electrocatalyst and offers a promising approach for the design of advanced electrocatalysts for water splitting.
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Journal of Physical Chemistry C
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2024
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IF 3.3
Han Liu,Zhiyuan Li,Xiaofeng Zhang,Hao Chen,Shijun Xu,Yi Fan,Qing Yuan,Yi Sun,Xiangshan Hou,Yi He
In this paper, a pulse electrodeposition technique is employed to introduce superhard nanoscale titanium nitride (TiN) particles into the Ni–W–P coating. Moreover, the work extensively examined the impact of varying TiN nanoparticle concentrations on the Ni–W–P coating’s performance. The findings reveal that the introduction of TiN effectively fills the crevices and other imperfections present on the pristine plating layer’s surface, improving the aggregation of grains. The incorporation of TiN nanoparticles, owing to their “labyrinthine effect” and grain refinement capability, notably enhanced the mechanical performance and corrosion resistance of the pure coating. Optimal results are achieved, showcasing superior mechanical attributes and corrosion defense, when the TiN concentration in the bath reaches 4 g/L. Vickers microhardness testing unveils that the Ni–W–P/TiN composite coating, at a TiN loading of 4 g/L, observes its microhardness escalating from 496.6 HV for the pure Ni–W–P coating to 847.6 HV. In a reciprocating friction assessment, the mean friction coefficient diminishes, plummeting from 0.663 for Ni–W–P to 0.325. Regarding corrosion tolerance, the Ni–W–P/TiN (4 g/L) composite coating demonstrates the greatest capacitive arc radius, alongside a corrosion current density diminishing from 26.0 μA/cm2 (Ni–W–P coating) to 11.93 μA/cm2 compared to the unaugmented Ni–W–P coating. Additionally, the self-corrosion potential shifts positively, going upward from −0.536 V for the Ni–W–P coating to −0.323 V. It is further established that the Ni–W–P/TiN composite at 4 g/L surpasses the Ni–W–P coating in corrosion resistance capabilities.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
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2024
·Vol. 49
·期 5
·e202300285
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IF 1.7
Mi Li,Zhongxuan Han,Lin Jiang,Guozhong Xu
Nano-thermite has become a subject of significant interest in the composite energetic materials field due to its high energy release rate. To cater to diverse engineering needs, thermite formulations are often customized to fulfill specific criteria. This study investigates the potential of metal nickel (Ni) as an additive to modify nano-thermite formulations, selected for its optimal calorific values and chemical reactivity. The base materials, nano-aluminum (Al) and iron oxide (Fe 2 O 3 ), are blended with varying mass ratios of Ni (1 %, 3 %, 5 %, 7 %, 9 %) using the wet ball milling method. Pre-reaction and post-reaction morphological and compositional alterations in the resultant thermite samples are scrutinized through SEM and XRD characterization tests. Moreover, DSC analysis and combustion experiments were conducted to examine the pyrolysis and combustion behaviors of the evaluated samples. The results reveal a reduced exothermic peak on the DSC curves with the introduction of Ni, making the liquid-solid ( L - S ) phase reaction more challenging compared to the Al/Fe 2 O 3 thermite. Intriguingly, Ni addition progressively decreases the combustion temperature of thermites as the Ni's mass ratio increases, with a peak efficiency at 7 % in the perforation tests on stainless-steel plates. This research further reveals that the thermite reaction mechanism is a combined consequence of the “pre-ignition-fusion” and “fusion-diffusion” mechanisms. These insights can provide valuable guidance for designing thermite formulations for potential applications in storage, management, and pyrotechnic cutting areas.
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ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Qiuying Wang,Zhiwei Wang,Menghang Qi,Hang Zhao,Xin Xin,Anjali Verma,Theeranun Siritanon,Arthur P. Ramirez,M.A. Subramanian,Peng Jiang
The severe urban heat island effect emphasizes the heightened importance of reducing building energy consumption. Cool pigments with higher near-infrared reflectivity contribute to the overall coating performance of the building. In this work, a novel intense blue pigment with superior infrared reflectance based on Ni-doped Zn2SiO4 was successfully synthesized via the simple solid-state method. The crystal structure, oxidation states, and optical properties are analyzed. The oxidation state of Ni was confirmed to be +2 using magnetic analysis and XPS. The intense blue color exhibited by the solid solution is due to the 3T1(3F) → 3T1(3P) transition of Ni2+ at the tetrahedral sites. UV–vis–NIR spectra demonstrate that this pigment exhibits superior near-infrared reflectance compared to cobalt blue in the range of 900–1700 nm, indicating its potential application in the realm of building energy conservation.
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CATALYSIS LETTERS
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2024
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IF 2.3
Xu Xian,Lan Ling,Xu Jiangong,Liang Zheng,Tan Jin,Wang Haiyong,Qiu Songbai
The development of biodegradable materials from biomass is a crucial strategy for leveraging biomass resources. A key component in this process is 2,5-bis(hydroxymethyl)furan (BHMF), a significant biomass-derived platform chemical. However, producing BHMF with high selectivity through the selective hydrogenation of 5-hydroxymethylfurfural, while avoiding the creation of unwanted byproducts, is a complex challenge. In our research, we have developed a novel catalyst featuring a magnetic core. This catalyst, which consists of platinum loaded onto a graphene-like shell, has been applied to the catalytic hydrogenation of HMF in an aqueous environment. Under the optimized conditions of 373 K, 3 MPa H 2 , and 1 h reaction time, a BHMF yield exceeding 99% was achieved. This method presents a promising and effective approach for the high-value conversion of biomass waste into polymer materials and pharmaceutical chemicals. Graphical Abstract
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Materials Today Communications
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2025
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IF 4.5
Dong Kong,Lu Mei,Guoyun Tang,Bingsheng Xu,Zhuo Chen,Zhangfu Yuan
Super-hydrophobic nickel-cobalt (Ni-Co) alloy coating was fabricated on Q235 steel by single-step electrodeposition, without any post-treatment with low-surface-energy agents. The influence of NH 4 Cl concentration on surface morphology, chemical composition, thickness, crystal structure, wettability, and corrosion performance was systematically investigated. Characterization techniques included scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and a contact-angle goniometer, while corrosion behavior was evaluated by Tafel polarization and electrochemical impedance spectroscopy (EIS). The results showed that the addition of crystal modifier NH 4 Cl did not affect the thickness and phase structure of Ni-Co coating but affected the composition and micro-morphology of the coating. With the increase of NH 4 Cl concentration, the cobalt content of the coatings gradually decreased, the nickel content gradually increased, and the micromorphology of the coatings changed from a prismatic cone-like structure to a sea urchin-like micro-nano structure. The contact angle of the Ni-Co coating prepared by 150 g/L NH 4 Cl was 152.56°, showing stable super-hydrophobicity, the self-corrosion current density ( I corr ) of the coating was the smallest, and the polarization resistance ( R p ) was the largest, which had the best corrosion resistance. After 12 h immersion in 3.5 wt% NaCl the coating retained its morphology and a contact angle above 150°, with only minor localized corrosion products, confirming durable super-hydrophobicity and superior anticorrosion performance.
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CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Ze-Min Zhao,Yu Zhang,Yu Chen,Jieying Jing,Wen-Ying Li
Nickel–aluminum (Ni–Al) spinel catalysts with distinct Ni/Al molar ratios were synthesized to construct Ni 2+ coordination sites. Owing to the favorable distribution of Ni 2+ coordination sites and the presence of suitable concentration of Ni 2+ in octahedral sites, Ni/Al-0.725 catalyst achieved an 86.1 % average yield of perhydrophenanthrene, which was higher than that obtained with Ni/Al-0.25 (6.3 %). Characterization results indicated that Ni 2+ of the Ni/Al-0.725 catalyst was present in octahedral sites and ∼ 40.4 % Ni 2+ was reduced to Ni, whereas the active Ni metal of Ni/Al-0.25 catalyst mainly comprised Ni 2+ occupying tetrahedral sites as precursors. Furthermore, the Ni/Al-0.725 catalyst exhibited the smallest Ni particle size (2.82 nm) and the largest Ni available surface (19.62 m 2 /g sample ), which helped alleviate competitive adsorption among aromatic hydrocarbons. The Ni reduced by the spinel catalysts was in an electron-deficient state, which enhanced the adsorption of polycyclic aromatic hydrocarbons.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Qian Zhang,Wenjun Liu,Shan Jiang,Minjun Kuang,Jiajin Li,Songbai Qiu,Xiaoping Wu
Motivated by the carbon neutrality policy and the demand for value-added bio-based chemicals, it is of great significance and interest to directly upgrade aqueous ethanol to produce long-chain alcohol chemicals and transportation biofuel. In this study, a bimetallic catalyst composed of Re doped Ni@C was prepared by a facile sol–gel method. The bimetal 70-NiRe@C demonstrated higher selectivity toward target long-chain alcohols product and lower selectivity of C1 byproducts than the monomeric metal Ni@C. The addition of Re promotes the dispersion of active Ni on the graphite carrier, contributing to the superior 59.9% ethanol conversion and 45.0% long-chain alcohol yield. This work guides future research into the direct upgrading of water-based bioethanol to the value-added long-chain fine chemicals and biofuels required.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaoqin Sun,Xuejiao Feng,Yuan Dang,Sining Yun
Sulfite is deemed as a promising precursor to produce highly reactive species for contaminants remediation. Herein, the urchin-like Ni-Fe-Mo sulfide (NiFeMoS x ) was anchored in-situ on nickel foam as a cathode to activate CaSO 3 for efficient degradation of tetracycline (TC) under natural condition. The degradation efficiency reached 92.7% within 60 min, which was about 1.81 times higher than that of the electro-Fenton process based on NiFeMoS x . The beneficial performance came from the synergistic activation of CaSO 3 by simultaneous rapid redox cycles of Fe(II)/Fe(III) and Ni(II)/Ni(III) on the NiFeMoS x cathode. Specifically, the primary intermediates Fe(II)-HSO 3 - and Ni(II)-SO 3 2- triggered a series of radical chain reactions, accompanied the reduction of Ni(III)/Fe(III) by electrochemistry and electron donor of Mo(IV) and S 2- on the surface of the catalyst. The regeneration of the Fe(II)/Ni(II) was quickly realized and subsequently triggered the chain reactions, which would accelerate the formation rate of reactive species, such as SO 4 ∙ − , ·OH, O 2 ∙ − and 1 O 2 , of which 1 O 2 and O 2 •- played important roles on degradation TC. This work provides a promising application for the efficient removal of persistent organic pollutants by metal sulfide activated sulfite.
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ACS Nano
·
2025
·
IF 16
Zhaoxi Chen,Gaige Zhang,Huayue Yang,Yun Zhao,An Pei,Peng Wang,Jin Yang,Junxi Zhang,Peilin Sun,Haohang Qin,Junzheng Zhan,Jian Peng,Wei-Hsiang Huang,Linan Zhou,Guangxu Chen
The electrochemical upcycling of polyethylene terephthalate (PET) into high-value products is essential for tackling “white pollution” and enhancing environmental protection. However, significant challenges remain, including the need for low-cost, highly efficient electrocatalysts, and the expensive electrolyte recovery in alkaline systems. This study presents a simple doping method to produce Ni octahedral-doped Co3O4 electrocatalysts (NiCo2O4) from spent LiCoO2 (SLCO), enabling sustainable PET upcycling to formic acid (FA) under economic conditions. The NiCo2O4 catalyst exhibits outstanding electrocatalytic activity for the ethylene glycol oxidation reaction (EGOR), achieving a Faradaic efficiency of 90.5% for FA at a potential of 1.50 V versus RHE. When integrated into an anion-exchange membrane (AEM) reactor, the system displayed an average current density of 173.5 mA/cm2 and a Faradaic efficiency of 84.7% at a cell voltage of 1.70 V. Systematic characterizations and DFT calculations indicate that Ni doping alters the spin-state electron density of Co, increases the localized electrons around Co sites, and significantly reduces the charge transfer resistance (Rct from 44.10 Ω to 10.23 Ω) of EGOR. Moreover, the Co–Ni dual sites enhance EG adsorption compared to individual Co or Ni sites. Finally, along with our electrochemical recovery and separation system (ERSS), a KOH recovery rate of 98.9% is achieved, yielding a return of $440.50 per ton of recycled PET─approximately a 4-fold profit increase compared to the traditional acid–base neutralization process (ABNP). This work describes a closed-loop model that simultaneously addresses battery recycling, plastic pollution reduction, and eco-friendly chemical production.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Long Liu,Siyuan Zhao,Yue Ji,Ziliang Wang
Photocatalysis, as a technology for splitting water to produce hydrogen, has been paid more and more attention. However, the catalyst has fewer active sites and a fast carrier recombination rate resulting in lower activity. In this work, BiOBr-Ni with Ni single atoms and oxygen vacancies was prepared by the microwave - assisted method. The SEM results show that the BiOBr-Ni surface layer is composed of nano-sheets. Electron paramagnetic resonance (EPR) indicates that the prepared BiOBr-Ni contains oxygen vacancies. XRD, XPS and spherical electron microscopy have proved that Ni exists in the form of single atom. In the process of photocatalytic hydrogen production, BiOBr-Ni showed excellent photocatalytic activity. DFT and experimental tests show that the improved photocatalytic hydrogen production is the joint action of oxygen vacancy and Ni single atom, which not only enhances the carrier separation efficiency but also greatly reduces the reaction energy barrier.
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