SCRIPTA MATERIALIA
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2024
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IF 5.3
Mengyun Jia,Dingliang Liang,Qing Du,Hui Wang,Yuan Wu,Suihe Jiang,Xiaobin Zhang,Haihui Ruan,Xiongjun Liu,Zhaoping Lu
Magnetothermal therapy (MT) is a noninvasive cancer treatment that has shown great promise in recent years. However, the low magnetothermal efficiency of the existing magnetic nanoparticles used in MT has been an obstacle to their widespread applications. In this work, we report a new class of Fe-Co-Ni-Cu high-entropy magnetic nanoparticles (HEMNPs) with exceptional magnetothermal properties synthesized by a thermal decomposition method. The fabricated HEMNPs, having an average diameter of 60–70 nm, exhibited a saturation magnetization of 42.4 emu/g and coercivity of 129.5 Oe. The hyperthermia measurement reveals that the HEMNPs have a maximum specific loss power of 202 W/g at the concentration of 2 mg/ml under an alternating magnetic field with an intensity of 46 Oe and a frequency of 266 kHz, demonstrating the great potential for MT applications. Our results demonstrate that the high-entropy concept can be extended to develop high-performance magnetic nanoparticles for MT applications.
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ENERGY & FUELS
·
2024
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IF 5.2
Dandan Jia,Jie Zhao,Rui Yan,Hongyi Gao,Zhaolin Fu,Zhongpeng Zhu,Zhiping Tao
The catalytic stability has always been a bottleneck of many reactions in industrial production. The preparation of long-life hydrogenation catalysts has been a hot research topic. Herein, Ni-ZIF was first grown in situ on the surface of SiO2. N-doped Ni/C nanoparticles were uniformly distributed on the SiO2 support after the subsequent annealing process. The uniform dispersion of Ni-ZIF contributed to the high dispersion of the active metal, and the highly dispersed Ni nanoparticles were free from thick carbon layers. The highly dispersed and fully exposed Ni determined its excellent low-temperature hydrogenation activity, which was critical for the extension of the catalyst lifetime. The presence of carbon and nitrogen was also beneficial to improve the stability of the catalyst. The N-doped SiO2@Ni/C catalyst exhibited excellent stability toward the hydrogenation of DCPD under mild condition. 100% DCPD conversion and >90% THDCPD selectivity were maintained after 144 h of continuous fixed-bed operation under GHSV of 2 h–1 at 60–90 °C.
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ChemCatChem
·
2024
·
IF 3.8
Chengjie Duan,Kun Li,Wenbo Ye,Weitao Mao,Guangke He,Xiang Liu
Graphical Exploring the impact of structural variations in organic acids on catalyst properties unveils crucial insights for enhancing arene hydrogenative activity. The Ni catalyst, supported by hydroxyapatite and aided by a hydroxy-dicarboxylic acid (tartaric acid) with an optimal ratio, resulted in relatively smaller Ni nanoparticles, a higher Ni 0 proportion, and increased acidic sites, showcasing exceptional hydrogenation performance. Developing non-noble metal catalysts that can efficiently and selectively hydrogenate arenes remains a significant challenge. In this study, we developed efficient Ni catalysts for the arene hydrogenation based on an organic acid-regulated impregnation strategy. These easily accessible Ni catalysts demonstrated exceptional efficiency, selectivity, reusability, and good substrate compatibility. The influence of carbon chain lengths and side-chain hydroxyl or amino groups on dicarboxylic acids used in the catalyst preparation was comprehensively investigated. Characterizations and kinetic studies demonstrated the influence of organic acids on the size of Ni nanoparticles, the proportion of metallic nickel, and the strength of surface acidity. These factors influenced the activation of arene and hydrogen, thereby affecting the hydrogenative activity. Notably, hydroxyapatite-supported Ni catalyst, assisted by tartaric acid (Ni-TA/HAP) with an appropriate tartaric acid-to-nickel ratio, resulted in relatively smaller Ni nanoparticles, an increased proportion of Ni 0 , and more acidic sites, thereby exhibiting the best hydrogenation performance.
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ACS Catalysis
·
2025
·
IF 13.1
Jia-qi Bai,Mei Ma,Huangfei Liu,Zhangkai Qian,Durui Liu,Yuncai Zhao,Yijing Gao,Jingshuai Chen,Mengdie Cai,Song Sun
The hydrogenation of nitriles is an environmentally friendly and atom-economical route to prepare high-value amines; however, it is still a challenge to control selectivity because of the occurrence of hydrogenation, self-coupling, and hydrogenolysis reactions during the hydrogenation process. It is highly desirable to develop efficient non-noble-metal catalysts for the hydrogenation of nitriles to secondary amines, although several noble metal catalysts have been reported. Herein, we successfully prepared a Cu–Ni/W20O58 catalyst and found that the Cu4.4–Ni0.6/W20O58 catalyst showed a 92.3% yield with initial TOFs of 270.0 h–1 at 373 K and 3 MPa H2 for the hydrogenation of benzonitrile (BN) to dibenzylamine (DBA), which was much superior to that of the monometallic Cu4.4/W20O58 and Ni0.6/W20O58 catalysts. Moreover, the Cu4.4–Ni0.6/W20O58 catalyst could be reused at least 4 times and was effective for the hydrogenation of various nitriles with superior selectivity to secondary amines. Furthermore, the reaction mechanism of BN hydrogenation for the Cu–Ni alloy of Cu4.4–Ni0.6/W20O58 was proposed on the basis of spectroscopic studies such as XRD, TPR, TEM, XAFS, and XPS, kinetic studies such as the effect of BN concentration and H2 pressure, the isotopic effect of hydrogen, and the effect of the reaction temperature and DFT calculations. The rate-determining step was the hydrogenation of benzylidenamine (BI) to the half-hydrogenated intermediate by one H atom over the Cu4.4–Ni0.6/W20O58 catalyst. The Ni–W20O58 interface was responsible for the adsorption and activation of BN, and the electron-rich Cu acted as the site for H2 dissociation; the synergistic effect of Cu and Ni led to the superior catalytic performance of the Cu4.4–Ni0.6/W20O58 catalyst.
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Progress in Natural Science-Materials International
·
2017
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IF 2.038
Hongbin Dai,Yujie Zhong,Ping Wang
The synthesis of highly active and selective catalysts is the central issue in the development of hydrous hydrazine (N 2 H 4 ·H 2 O) as a viable hydrogen carrier. Herein, we report the synthesis of bimetallic Ni-Ir nanocatalyts supported on CeO 2 using a one-pot coprecipitation method. A combination of XRD, HRTEM and XPS analyses indicate that the Ni-Ir/CeO 2 catalyst is composed of tiny Ni-Ir alloy nanoparticles with an average size of around 4 nm and crystalline CeO 2 matrix. The Ni-Ir/CeO 2 catalyst exhibits high catalytic activity and excellent selectivity towards hydrogen generation from N 2 H 4 ·H 2 O at mild temperatures. Furthermore, in contrast to previously reported Ni-Pt catalysts, the Ni-Ir/CeO 2 catalyst shows an alleviated requirement on alkali promoter to achieve its optimal catalytic performance.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Yun-Yang Li,Hao-Jie Yan,Ruo-Zhan Yin,Qing-Qing Sun,Lian-Kui Wu,Fa-He Cao
In this work, SiOC coatings incorporated with Ni nanoparticles were fabricated on γ-TiAl alloy by dip-coating. The microstructure and high temperature oxidation behavior of the SiOC-Ni coatings with different Ni contents were investigated. Results showed that the incorporation of Ni nanoparticles improved the oxidation resistance of the SiOC coating at 850 ℃. During thermal exposure to air, the incorporated Ni particles would react with both oxygen and the SiOC coating, forming NiO and Ni 2 Si, respectively, therefore changing the structure of the SiOC coating. The generation of NiO and Ni 2 Si is beneficial in reducing the oxygen partial pressure at the coating/substrate interface, thereby facilitating the formation of a protective aluminum oxide layer.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Huaxu Zhang,Jiuheng Yu,Qiuyu Su,Wei Teng
Ag 3 PO 4 /NiFe@Ni composites were obtained by depositing silver phosphate on nickel–iron layered double hydroxide (NiFe-LDH), is based on nickel flakes via two distinct methods: hydrothermal and successive ionic layer adsorption (SILAR). The electrode was used as a photoanode to remove Escherichia coli ( E. coli ) from wastewater and to facilitate the photoelectrocatalytic (PEC) breakdown of organic pollutants. In addition, the degrading efficiency of Tetracycline (TC) and rhodamine B was further enhanced by activating persulfate (PMS) during the PEC process. The Ag 3 PO 4 /NiFe@Ni electrode’s effective catalytic activity is mostly ascribed to Ag 3 PO 4 ’s visible light activity as well as the construction of a Z-scheme heterojunction, it enhances the efficiency of e − and h + (holes) separation and speeds up electron transport. The free radical trapping process revealed that multiple free radicals combined to achieve an efficient degradation of the pollutants. The PEC process activated PMS degraded 92 % of TC within 60 min, in which the oxidation of h + was critically important. This study provides insights to design of multifunctional low-cost Z-scheme heterojunctions and broadens the application scope of photoelectrocatalytic technology.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Shuyue Feng,Chenqian Chen,Wenjuan Zhang,Jianyong Che,Chengyan Wang,Yongqiang Chen
Nickel and cadmium are critical materials in the clean energy sector, but their limited availability poses significant challenges. Recycling these metals from secondary sources can mitigate supply risks, yet their separation during recovery is often difficult, especially when striving to conserve energy and minimize environmental impact. This study proposed an electrochemical method for the efficient separation and recovery of cadmium from Cd-Ni solutions. Under optimal conditions of 0.5 V applied voltage, 10 g/L initial acid concentration, 50 °C temperature, and a 2h duration, over 95.6 % of cadmium was recovered with a purity of 93.3 %, while nickel loss was restricted to just 5.38 %. The high separation efficiency is attributed to the preferential reduction of cadmium over nickel, even at low concentrations, as confirmed by impedance spectroscopy and SEM analysis. Cadmium deposition occurred exclusively at the anode, with minimal nickel loss primarily resulting from the formation of Ni(OH) 2 . Kinetic analyses revealed that zinc dissolution at both the anode and cathode followed a first-order rate, with the anode dissolving more rapidly, thereby facilitating cadmium deposition. This method offers a sustainable option for recovering these metals from secondary sources by effectively integrating electrochemical and cementation processes.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
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IF 2.6
Wei Kaijun,Zhang Shihong,He Yi,Li Hongjie,Zhou Huilian,Li Zhiyuan,Xu Shijun,Chen Quangang,Cheng Xingtao
Zinc-nickel (ZN) coatings were deposited on N80 steel substrates using pulsed electrodeposition. The current density of the two-step electrodeposition process was adjusted to promote the formation of micro/nanostructures on the coating surface. Superhydrophobic coatings were obtained by using appropriate current parameters and subsequent modification of the coatings with hexadecyltrimethoxysilane. The results showed that the coating achieved a water contact angle of 157 ± 1° and a sliding angle of 6 ± 1°, indicating that the superhydrophobicity was successfully constructed. In addition, electrochemical tests confirmed the coating’s excellent corrosion resistance. Compared with other samples, the corrosion current density of the coating in 3.5 wt% NaCl solution was significantly reduced, the corrosion inhibition rate reached 94.41%, and the impedance modulus in the low-frequency region of the Bode plot was improved by one order of magnitude compared with that of the blank sample. In conclusion, the prepared superhydrophobic coating has good hydrophobicity and corrosion resistance and has a broad industrial application prospect.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Qikai Ren,Shuaishuai Wang,Haoyu Liu,Xing Zhang,Yanran Cui,Gui-Rong Zhang,Lei Nie,Donghai Mei
The dry reforming of methane (DRM) serves as a pivotal reaction for hydrogen generation and the simultaneous conversion of methane and carbon dioxide, two major greenhouse gases, into syngas that can further be converted into high-value fuels and chemicals. However, catalyst deactivation imposes a major challenge that prohibits the market penetration of DRM. Here we reported a series of bifunctional Ni-Ce catalysts supported on SSZ-13 (Ni-Ce-SSZ-13) and discovered that a small amount of Ce could significantly enhance the activity, selectivity, and stability for DRM. Optimal ratio of Ni to Ce has been identified to yield peak catalytic performance. The optimal performance is correlated with the maximum Ce 3+ /Ce 4+ ratio as revealed by XPS analysis, which implies an increased presence of oxygen vacancies in the catalysts. It played a crucial role in facilitating the oxidation of activated CH 4 species at Ni sites, thereby enhancing DRM activity and diminishing the detrimental coke formation. It is also disclosed that integrating proper amount of Ce fosters its interactions with Ni, effectively preventing the agglomeration of Ni sites. This work presents great implications for the rational design and catalytic synergy of bi-/multi-functional zeolite catalysts for other technological applications.
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Materials
·
2025
·Vol. 18
·期 14
·3419
·
IF 3.2
Muhammad Sabir,Mahmoud Sayed,Iram Riaz,Guogen Qiu,Muhammad Tahir,Khuloud A. Alibrahim,Wang Wang
The rapid recombination of photoinduced charge carriers in semiconductors remains a significant challenge for their practical application in photocatalysis. This study presents the design of a step-scheme (S-scheme) heterojunction composed of carbon nitride (g-C3N4) and nickel-based metal–organic framework (Ni-MOF) to achieve enhanced charge separation. The establishment of an S-scheme charge transfer configuration at the interface of the Ni-MOF/g-C3N4heterostructure plays a pivotal role in enabling efficient charge carrier separation, and hence, high CO2photoreduction efficiency with a CO evolution rate of 1014.6 µmol g−1h−1and selectivity of 95% under simulated solar illumination. CO evolution represents an approximately 3.7-fold enhancement compared to pristine Ni-MOF. Density functional theory (DFT) calculations, supported by in situ irradiated X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) experimental results, confirmed the establishment of a well-defined and strongly bonded interface, which improves the charge transfer and separation following the S-scheme mechanism. This study sheds light on MOF-based S-scheme heterojunctions as fruitful and selective alternatives for practical CO2photoreduction.
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PubMed
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jingyu Song,Yongqian Shen,Guibin Zhang,Mingxuan Sun,Mengyao Han,Xueyan Du
While two-dimensional lamellar materials, specifically Ti 3 C 2 T x MXenes, have shown great promise as wave-absorbing materials, the precise design of interlayer spacing poses a persistent challenge. In this study, Ti 3 C 2 T x MXene layers with adjustable interlayer spacings were crafted using a straightforward molecular welding technique. Through the incorporation of Ni nanoparticles onto the Ti 3 C 2 T x MXene layers using a combination of simple mechanical stirring and carbonation reactions, we successfully developed Ti 3 C 2 T x MXene/Ni/C composites featuring a distinct lamellar structure. A uniform dispersion of Ni nanoparticles on the surface of the Ti 3 C 2 T x MXene nanosheets was found with some of the nanoparticles intercalated into the layers. The Ti 3 C 2 T x MXene/Ni/C composites exhibited a maximum reflection loss (RL) value of −42.3 dB at 12.3 GHz, accompanied by an impressive effective absorption bandwidth (EAB) of 5.6 GHz. This outstanding absorption performance could be attributed to various factors, including the dielectric loss of the Ti 3 C 2 T x MXene lamellae, reflections and scattering of multiphase heterostructures, the magnetic loss of the Ni nanoparticles, and their synergistic attenuation. Furthermore, Ni nanoparticles with high electrical conductivity induced vortex currents under the alternating influence of electromagnetic waves (EMWs), resulting in a substantial depletion. This study introduces an innovative approach for synthesizing Ti 3 C 2 T x MXene/Ni/C composites with tunable interlayer spacing, showing their potential for applications in microwave absorption (MA).
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