JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 9
·7692-7700
·
IF 2.324
Hu Zhen,Guo Haiyong,Zhao Li,Wu Yadan,Wang Shimin,Wan Li
A double-layer composite film (DLCF) that consists of upconversion composite La(OH) 3 :Er 3+ /Yb 3+ +P25 (UC + P25) as underlayer and large TiO 2 spheres (LS-TiO 2 ) as overlayer is designed as the photoelectrode of dye-sensitized solar cells (DSSCs). The upconversion luminescent material La(OH) 3 :Er 3+ /Yb 3+ can convert near-infrared region to visible light to improve the light absorption, and LS-TiO 2 has been used as light-scattering layer to increase the optical length in the film and enhance light harvesting. The DLCF with lower absorbed dye achieved the highest conversion efficiency due to the synergistic effect of the upconversion luminescent layer and the light-scattering layer, and with an optimum mixing ratio, a conversion efficiency of 9.24% is attained, which is a significant improvement of 68.3% compared with the pure P25 film photoelectrode.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Hele Hua,Nan Zhang,Zhidan Wang,Rui Li,Yunfang Wang,Jianxin Liu,Peide Han,Caimei Fan,Yawen Wang
Electrocatalytic NO 3 − reduction reaction (NO 3 RR) has attracted much attention as a promising NH 3 synthesis pathway, and Cu-based catalysts have been proven to lead to advantages in nitrate reduction . However, the active hydrogen (H*) produced by the Cu-based catalyst is insufficient to satisfy the hydrogenation process of the NO 3 RR intermediate, resulting in a large generation of NO 2 − . In this paper, the Co(OH) 2 /Cu 2 O heterojunction was constructed to improve the kinetics of H 2 O dissociation to generate H* and Co(OH) 2 /Cu 2 O (5.87 %) showed lower faradaic efficiency (FE) of NO 2 − than Cu 2 O (50.95 %). Mechanistic studies reveal that the introduction of Co(OH) 2 can help Cu 2 O lower the energy barrier of H 2 O dissociation, greatly boosting the supply of active hydrogen (H*). Not only that, but the reaction energy barriers of *NO to *NOH can be greatly reduced. The final twofold reason works together to greatly improve the efficiency of hydrogenation of NO 2 − , largely solving the problem of FE reduction due to the delayed consumption of NO 2 − , thus realizing improved performance.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Hao Yin,Bingxian Wu,Xueyang Leng,Hong Gao,Jing Yao
Electrolytic water-splitting has the advantages of high efficiency, environmental friendliness, and sustainability. It is becoming a leading approach for producing hydrogen. In order to improve the efficiency of water-splitting, a bifunctional electrocatalyst with high performance is needed. Herein, we present a novel approach to construct a bifunctional electrocatalyst for overall water-splitting by compounding Ni(OH)2 and CoP. This combination induced charge optimization, thereby leading to surface reconstruction. The nanocomposite displayed outstanding catalytic performance, benefiting from its more reactive surface area, improved conductivity and enhanced electrocatalytic activity. The resulting Ni(OH)2/CoP electrocatalyst exhibited excellent catalytic performance, with low overpotentials of 266 mV at 50 mA cm−2 for the OER and 71 mV at −10 mA cm−2 for the HER, and required only 1.54 V to reach 10 mA cm−2 in an overall water-splitting device, overtaking most of the recently reported Co- and Ni-based catalysts. This innovative strategy offers new directions for the design of efficient electrocatalysts.
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BMC Complementary and Alternative Medicine
·
2017
·Vol. 17
·期 1
·1-11
·
IF 2.288
Jiang Qian,Li Xican,Tian Yage,Lin Qiaoqi,Xie Hong,Lu Wenbiao,Chi Yuguang,Chen Dongfeng
Background
Mori Fructus and Mori Ramulus are two traditional Chinese herbal medicines from mulberries. The present work explores their beneficial effects on •OH–treated mesenchymal stem cells (MSCs) and discusses possible mechanisms.Methods Lyophilized aqueous extracts of Mori Fructus (LAMF) and Mori Ramulus (LAMR) were prepared and analyzed using HPLC. LAMF and LAMR (along with morin) were further investigated for their effects on •OH-treated MSCs using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl (MTT) assay. The direct antioxidation mechanisms were studied using 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (PTIO•)-scavenging, 2,2′-azino-bis (3-ethylbenzo-thiazoline-6-sulfonic acid (ABTS+•)-scavenging and 1,1-diphenyl-2-picryl-hydrazl (DPPH•)-scavenging, as well as Cu2+-reducing and Fe3+-reducing antioxidant power. Finally, the indirect antioxidant mechanism was investigated based on the UV-vis spectra of Fe2+-chelation.Results In each LAMF and LAMR, seven phytophenols were successfully measured by HPLC, including five flavonoids (morin, rutin, astragalin, isoquercitrin and luteolin) and two non-flavonoids (chlorogenic acid and maclurin). MTT assays revealed that LAMF, LAMR and morin could effectively increase the survival of •OH-treated MSCs at 10–100 μg/mL, and could effectively scavenge PTIO• (IC 50 6609.7 ± 756.6, 4286.9 ± 84.9 and 103.4 ± 0.9 μg/mL, respectively), DPPH• (IC 50 208.7 ± 3.0, 97.3 ± 3.1 and 8.2 ± 0.7 μg/mL, respectively) and ABTS+• (IC 50 73.5 ± 5.8, 34.4 ± 0.1 and 4.2 ± 0.2 μg/mL, respectively), and reduce Cu2+ (IC 50 212.5 ± 7.0, 123.2 ± 0.9 and 14.1 ± 0.04 μg/mL, respectively) & Fe3+ (IC 50 277.0 ± 3.1, 191.9 ± 5.2 and 5.0 ± 0.2 μg/mL, respectively). In the Fe2+-chelating assay, the five flavonoids produced much stronger shoulder-peaks than the two non-flavonoids within 420–850 nm.Conclusion
Mori Fructus and Mori Ramulus, can protect MSCs from •OH-induced damage. Such beneficial effects can mainly be attributed to the antioxidant action of phytophenols, which occurs via direct (ROS-scavenging) and indirect mechanism (Fe2+-chelating). The ROS-scavenging mechanism, however, include at least a H+-transfer and an electron-transfer (ET), and possibly includes a hydrogen-atom-transfer (HAT). In the Fe2+-chelating, flavonoids are more effective than non-flavonoids. This can be attributed to several adjacent planar chelating-sites between the 3-OH and 4-C = O, between the 4-C = O and 5-OH, or between the 3′-OH and 4′-OH in flavonoids. Such multiple-Fe2+-chelating reactions cause overlap in the UV-vis absorptions to deepen the complex color, enhance the peak strength, and form shoulder-peaks. By comparison, two non-flavonoids with catechol moiety produce only a weak single peak.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2025
·Vol. 27
·期 2
·1-15
·
IF 2.6
Hui Xianghe,Fang Dong,Wang Guifang,Ran Feng,Zhang Xin,Fu Zewei,Ruzimuradov Olim
Perovskite hydroxystannate (MSn(OH) 6 ) has garnered considerable interest in recent years as a novel flame retardant characterized by its low toxicity and environmentally benign properties. In order to improve the flame retardancy and smoke suppression properties of epoxy resin (EP) matrices, transition metal hydroxystannate (MSn(OH) 6 , M = Fe, Co, Mn) was prepared by a ultrasonic-coprecipitation method and used as flame retardants. The synthesized composites were assessed for their flame retardant characteristics and mechanical properties through the measurement of the limiting oxygen index (LOI), the cone calorimetry test (CCT), and universal tensile testing. Upon the incorporation of 10 wt% of the MSn(OH) 6 flame retardants, the flame retardant of EP composites exhibited marked enhancement, especially manganese hydroxystannate (MHS). Compared with pure EP, the EP/MHS-10 composite demonstrated the best performance, reducing the peak of heat release rate (pHRR), total heat release (THR), total smoke production (TSP) by 60.0%, 14.4%, and 32.6%, respectively. During the process of combustion, the decomposition of MSn(OH) 6 results in the generation of non-flammable gases and water vapor. In the condensed phase, tin (Sn) and transition metals contribute to the formation of a more protective char residue. The residue serves as a physical barrier, effectively isolating the underlying epoxy (EP) matrix material from heat and oxygen.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Cengceng Du,Zhenyu Wang,Xin Chen,Yiming Wang,Chen Chen,Xinyu Liu,Yuqiu Huo,Hongbin Sun,Guangwen Xu
The efficient and high-quality production for hydrogen through water electrolysis at high current densities is crucial for commercial utilization. However, the performance of existing hydrogen evolution reaction (HER) electrocatalysts is far from satisfactory. In this regard, we proposed a method to prepare Rh–Ni(OH) 2 catalyst based on Nickel foam (NF). The hydrolysis galvanic replacement of nickel boride with RhCl 3 led to produce a lattice contraction in Ni(OH) 2 due to the rigid pressure generated, resulting in outstanding HER performance at high current densities. It achieves an industrial current density of 500 mA cm −2 with an overpotential of 130 mV. Furthermore, at the industrially prefer temperature of 80 °C, only 67 mV overpotential is required. The catalyst also demonstrated exceptional stability, maintaining excellent performance even after a stability test of 100 days with a current density of 200 mA cm −2 . Through Density-functional theory (DFT) calculations, Rh series reduced the hydrogen adsorption free energy.
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JOURNAL OF ENDOCRINOLOGICAL INVESTIGATION
·
2025
·
IF 3.5
Liang Yongchao,Huo Hongjin,Wei Wei,Wang Dongxuan,Lu Jingjing,Yi Wenjie,Jiang Fei
Purpose Perfluorooctane sulfonic acid (PFOS) is a representative persistent organic pollutant that has been shown to impair male reproductive function. Epidemiological studies and animal models suggest that vitamin D may modify male reproductive function. However, whether 1α,25(OH) 2 D 3 could mitigate the PFOS-induced damage of Sertoli cells, and the underlying mechanisms remain poorly defined. Methods Mouse Sertoli cell line TM4 were pretreated with or without 10 nM or 100 nM 1α,25(OH) 2 D 3 for 6 h, followed by 100 µM or 200 µM PFOS for 24 h. Cell viability was assessed using the CCK8 assay. Reactive oxygen species (ROS) were detected by fluorescent staining, while malondialdehyde (MDA), superoxide dismutase (SOD), and glutathione (GSH) levels were measured using commercial kits. siRNA transfection, quantitative real-time PCR (qRT‒PCR), and Western blotting were performed to elucidate the underlying mechanisms. Molecular docking studies were conducted to explore the potential binding of PFOS to Keap1. Results PFOS increased MDA contents, decreased GSH levels, and induced cytotoxicity in mouse Sertoli cells. Mechanistically, PFOS might directly bind to Keap1, facilitating its degradation, leading to persistent activation of the Nrf2-ARE pathway. Conversely, 1α,25(OH) 2 D 3 attenuated PFOS-induced cytotoxicity by alleviating the Nrf2-ARE pathway, a protective effect which was abolished by vitamin D receptor (VDR) knockdown. Conclusion PFOS induces cytotoxicity in Sertoli cells by binding to Keap1 and persistently activating the Nrf2-ARE pathway. 1α,25(OH) 2 D 3 emerges as a promising candidate for mitigating PFOS-induced testicular dysfunction. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 20
·1-13
·
IF 2.8
Xie Linqiang,Ding Jiangtao,Liu Han,Lu Di,Yu Wanchun,Hu Te,Lin Jiayang,Cheng Zhenzhi,Gao Fei,Luo Guangsheng,Zhou Weiping
Soft magnetic composites with enhanced permeability and reduced power loss are urgently needed in the next generation of power electronics and electrical machines. However, traditional insulation techniques suffer from the uneven coating or complex process, which cannot meet these requirements. Here, the feasibility of Ba(OH) 2 as a coating layer of soft magnetic powder is explored. Due to its low melting point, Ba(OH) 2 exhibits good flowability in the molten state, enabling it to evenly coat FeSiAl particles and fill interparticle gaps, thereby forming a uniform, dense insulating layer. This novel coating strategy improves the formability of the magnetic powder cores and optimizes the cores’ soft magnetic performance. Compared with SMPCs without Ba(OH) 2 coating, FeSiAl@Ba(OH) 2 SMPCs have higher magnetic permeability (μ e = 59.5), higher quality factor ( Q max = 127.3), lower high-frequency power loss ( P cv = 2062.9 mW/cm 3 @1 MHz and 50 mT), and good DC bias performance. Our results provide a new approach for the design of insulation coatings for SMPCs, demonstrating significant application potential for high-frequency electronic devices.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qing Guo,Xiulin Wang,Fan Yang,Shuhui Zhou,Kexin Wei,Yu Zhang,Li Sun,Siyuan Sun,Hongchen Liu,Junpu An,Yang Sun,Peidi Shen,Yongfeng Li
Rational design and preparation of single-atoms (SAs) catalysts with high atom efficiency and anion intercalation offer a promising way to enhancing the catalytic activity of sodium borohydride (NaBH 4 ) hydrolysis. Herein, Pt SAs loaded on borate anion-intercalated Co(OH) 2 nanoflakes (Pt/Co(OH) 2 -B) were synthesized by boron-assisted method and wet impregnation method, achieving a massive metal loading of 9.8 % for the Pt SAs through the oxidation of Co(OH) 2 -B. The optimal catalyst loaded with 6.1 % Pt SAs (Pt M /Co(OH) 2 -B) has a turnover frequency (TOF) of 956.34 mol H2 min - 1 mol Pt -1 , a hydrogen generation rate (HGR) of 9315 mL min - 1 g -1 cat at 30 °C, and a low activation energy of 47.31 kJ mol - 1 for NaBH 4 hydrolysis, outperforming most of the reported noble metal catalysts. The Co element attracts the electrons of Pt SAs, causing Pt SAs to be in an electron-deficient state, which accelerates the adsorption of H 2 O and promotes the hydrolysis rate of NaBH 4 . The remarkable performance is primarily attributed to the synergistic interaction between Pt SAs and α-Co(OH) 2 -B, with a slight shift in the d-band center optimizing the electronic structure of the hydrolysis reaction and reducing the binding energy, thereby achieving exceptional catalytic performance. Density functional theory (DFT) calculations demonstrate that the electronic synergistic interaction between Pt and α-Co(OH) 2 -B reduces the adsorption energy of BH 4 - and H 2 O. The interaction further lowers the energy barrier of B-H bond cleavage as the rate-determining step, thereby accelerating the hydrolysis rate of NaBH 4 . This work provides an innovative approach for the development of green hydrogen production catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Huajie Lan,Lei Tian,Wenfeng Wang,Yuan Li,Shumin Han,Lu Zhang
The currently used β -Ni(OH) 2 for alkaline nickel batteries are falling short of higher capacity demand. In contrast, α -Ni(OH) 2 with high theoretical capacity can address this need. However, the α -Ni(OH) 2 suffers from poor stability and intrinsic low electrical conductivity. Herein, we designed La/Ce-doped spherical α -Ni(OH) 2 and study the effect of La/Ce on the structure and electrochemical properties of α -Ni(OH) 2 . The increased specific surface area of the α -Ni(OH) 2 with La/Ce doping reduces the electron transfer resistance. The La/Ce-doped α -Ni(OH) 2 with 2 at% La (Ni-La-2) and 3 at% Ce (Ni-Ce-3) doping deliver high capacities of ∼365 mAh g –1 and ∼373 mAh g –1 , respectively, which is only 309 mAh g –1 for the pure α -Ni(OH) 2 . Meanwhile, the La/Ce-doping stabilizes the structural robustness of the α -Ni(OH) 2 during cycling. Notably, Ni-La-2 shows a superior stable cycling life with a capacity retention of ∼95 % after 400 cycles, which is ∼20 % higher than that of pure α -Ni(OH) 2 .
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LANGMUIR
·
2022
·
IF 4.331
Yafeng Wang,Xian Luo,Wenjie Lu,Bin Huang,Yanqing Yang
In this study, β-Ni(OH)2 with a unique flower-like morphology was synthesized through a hydrothermal method. The doping of Rh in β-Ni(OH)2 was achieved by a reduction method. The as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy for the crystal structure, morphology, composition, and chemical state analysis. The electrochemical tests revealed that the doping of Rh can significantly increase the electrocatalytic performance of β-Ni(OH)2 in 1.0 M KOH solution. The methanol oxidation peak current density of Rh-doped β-Ni(OH)2 reached 95 mA cm–2 with a Tafel slope of 40 mV dec–1. The reason for these improvements is that Rh can suppress the phase transformation of NiOOH from β to α. Meanwhile, the electronic structure change of nickel in β-Ni(OH)2 and the defect ratio increase caused by Rh doping are beneficial to methanol oxidation reaction (MOR) catalytic activity. Furthermore, the synergistic effect between Rh and Ni(OH)2 improved the surface activity of β-NiOOH. The doping of Rh in β-Ni(OH)2 is initiative in this work, which provides a new strategy to design highly efficient and cost-effective MOR electrocatalysts for alkaline DMFCs.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 68
·e202201985
·
IF 5.02
Hao Zhang,Jixiang Ji,Fa Guo,Zhurui Shen
Graphical The mechanism for alkali-treated photocatalyst in CO 2 photoreduction is studied, especially for demonstrating the role of OH − and metal cations in detail for highly selective production of CO. DFT calculations confirmed that K ions enhance the charge density of nearby atoms to stabilize CO* groups and reduce the reaction energy barrier, inducing the switch of CH 4 to CO. In this work, the modulation of activity and selectivity via photoreduction of carbon dioxide under simulated sunlight was achieved by treating P25 and P25/Pt NPs with KOH. It found that KOH treatment could significantly improve the overall conversion efficiency and switch the selectivity for CO. Photoelectric characterizations and CO 2 -TPD demonstrated that the synergistic effect of K + and OH - accelerated the separation and migration of photogenerated charges, and also improved CO 2 adsorption level. Significantly, the K ions could act as active sites for CO 2 adsorption and further activation. In situ FTIR measurements and DFT calculations confirmed that K + enhanced the charge density of adjacent atoms and stabilize CO* groups, reducing the reaction energy barrier and inducing the switching of original CH 4 to CO, which played a selective regulatory role. This study provides insights into the photocatalytic activity and selectivity of alkali-treated photocatalysts and facilitates the design of efficient and product-specific photocatalysis.
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