MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Kang Wei,Jun Li,Xiao Sun,Meng Shao,Jianguo Tang,Soowohn Lee
rGO/Ni(OH) 2 /Ni 3 S 2 composite electrode materials were successfully synthesized on Ni foam (NF) by a two-step hydrothermal process and subsequent alkalization treatment. To investigate the influence of reaction time in the secondary hydrothermal process, three different hydrothermal times (4 h, 6 h, 8 h) were set. The results showed that the electrode had the highest specific capacitance of 2260 F·g −1 at 1 A·g −1 at the hydrothermal reaction time of 6 h, (4 h: 1807.8 F·g −1 , 8 h: 1358.3 F·g −1 ). In addition, it exhibited prominent rating capability and cycling stability, with 41.7% retention at 10 A·g −1 and 137.9% retention after 5000 cycles at 50 mV⋅s −1 . Finally, the assembled hybrid supercapacitor (HSC) with rGO/Ni(OH) 2 /Ni 3 S 2 /NF (6 h) and active carbon displayed outstanding electrochemical performance. When the power density was 400.5 W⋅kg −1 , it showed the energy density (25.2 Wh⋅kg −1 ), proving its potential as electrode materials for HSC devices.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 112
·期 1
·152-161
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IF 2.3
Zhang Enlei,Chen Jiaojiao,Xu Rui,Song Xiaowen,Zhang Bengui,Wang Guosheng
Catalytic reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) is an important method for treating toxic nitroaromatic pollutant. In this work, amorphous CoSn(OH) 6 nanocubes were synthesized by coprecipitation and calcination methods for 4-NP photocatalytic reduction. The crystal structure, morphology and optical property of the samples were characterized by XRD, SEM, TEM, XPS, and UV–vis DRS. The amorphous CoSn(OH) 6 nanocubes showed excellent photocatalytic performance in 4-NP reduction. The effects of catalyst dosage, 4-NP concentration, and sodium borohydride concentration on the conversion rate of 4-NP were investigated. The results showed that the conversion rate of 4-NP could reach 98.38% in 15 min at room temperature under visible light irradiation. After five cycles of experiments, the conversion rate of 4-NP remained above 90%, indicating the good catalytic stability of the amorphous CoSn(OH) 6 nanocubes. Finally, the mechanisms of photocatalytic reduction on amorphous CoSn(OH) 6 nanocubes are also discussed. The successful preparation of amorphous CoSn(OH) 6 nanocubes may enable the widespread use of amorphous polymetallic oxides for the removal of nitrophenols from wastewater in the future. Graphical Abstract Amorphous CoSn(OH) 6 nanocubes exhibit superior photocatalytic reduction 4-NP to 4-AP performance.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Xisong Feng,Mengjian Gao,Wanqing Wei,Wei Song,Jian Wen,Hongyu Wang,Guipeng Hu,Xiaomin Li,Cong Gao,Jing Wu
25-hydroxyvitamin D3 (25(OH)VD3) is an important daily nutritional supplement, and direct enzymatic C25 hydroxylation of vitamin D3 (VD3) to 25(OH)VD3 is a green and sustainable method. However, the low catalytic activity and electron transfer efficiency of redox partners of cytochrome P450 limited its production. Here, structure-guided semirational design of CYP109E1 led to the mutant CYP109E1M2, which showed a 2-fold increase in 25(OH)VD3 production compared to the wild-type. Furthermore, the novel reductase domain BmRD was first employed to construct a fusion protein with CYP109E1M2. Notably, truncating only two amino acids at the N-terminus of BmRD generated a fusion protein Chimera-2, resulting in a 38.5% increase in 25(OH)VD3 production. Under optimized conditions, the engineered strain Escherichia coli 03-2 produced 491.3 mg/L 25(OH)VD3 with a conversion of 49.0% and a space-time yield of 61.4 mg/(L·h). This work demonstrates the modification and optimization potential of P450 and lays a theoretical foundation for the industrialization of the 25(OH)VD3 biosynthesis.
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ACS Applied Optical Materials
·
2025
·
IF 3.8
Feifei Qin,Yue Cao,Chengwei Wang,Guogang Zhang,Xiaoxuan Wang,Feng Chen,Gangyi Zhu,Yongjin Wang
Nowadays, most solid-state lighting-based visible light communication (VLC) technology suffers from the color converter’s short optical bandwidth or low stability. Herein, we fabricated MAPbBr3@PbBr(OH) nanocrystals (NCs) with high optical bandwidth and water-stable properties for color conversion of VLC and a white light-emitting diode (LED) system. The sample’s characteristic photoluminescence (PL) spectrum is green emission peaked near 529 nm. As a color converter, it has a high bandwidth capacity for devices. The sample indicates internal quantum efficiency (IQE) of about 38.33% and a PL decay time of about 5.5 ns, and it can maintain its PL properties in water for over 90 days The calculated optical bandwidth is about 49.4 MHz. Its measured −3 dB bandwidth with a 405 nm laser diode can reach 25 MHz with a data rate over 50 Mbps. More interestingly, the perovskite NCs can replace the green phosphor to build a high-speed and multicolor LED, and the −3 dB bandwidth can be maintained at over 80% in this case. These features are far beyond the abilities of commercial green phosphors. Finally, we demonstrate an underwater text transmission system with a 405 nm LED, perovskite color conversion layer, and low-cost silicon-based photodetector.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yufeng Zhang,Rong Xu,Qing Shao,Guokang Luo,Jiahao Liu,Xin Chen,Shan-shan Yu,Shaoxian Liu,Jin Zhang,Di Liu,Wei Zhu
Coupling the ethanol electrooxidation reaction (EOR) with the hydrogen evolution reaction is an effective way to obtain green energy. Although Ni-based catalysts have the characteristics of low cost and good stability, meanwhile, the activity needs to be further improved. Here, we report a Ni-based heterojunction EOR catalyst, Ni3Co1(OH)x@Ni3S2, composed by two phases of Ni3S2 and Ni3Co1(OH)x. The obtained Ni3Co1(OH)x@Ni3S2 showed excellent EOR performance, which could achieve a high specific activity of 315.7 mA/cm2 at 1.40 V, which was 15.5 times that of Ni(OH)2 and superior to most reported Ni-based catalysts. The addition of Co regulates the d-band center and introduces additional positively charged centers for the strong adsorption of OH–. The anionic effect of Ni3S2 can accelerate oxidation of the Ni active centers to active Ni(III) sites. The heterojunction structure can enhance the cation and anion effects and the turnover rate of OH– species, improving the EOR performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Bei-Bei Zhang,Ping Liu,Hao-Ran Wang,Yan-Yang Li,Lin Zhang,Qing-Chao Liu,Zhong-Jun Li,Hong-Chang Yao
Developing efficient photocatalysts for solar-driven overall water vapor splitting is crucial for sustainable hydrogen production. However, current photocatalytic efficiencies are limited by inadequate hygroscopicity, sluggish proton transport, and rapid recombination of photogenerated electron-hole pairs. Here, we report the successful synthesis of an amorphous Ni(OH) 2 /Ni 2 B heterojunction material with a core–shell structure by regulating the reducing environment during the formation of nickel boride. This material exhibits highly efficient overall water vapor splitting performance without any cocatalysts. Under simulated solar irradiation, the optimized sample achieves a hydrogen production rate of 976 μmol·g −1 ·h −1 , with near-stoichiometric evolution of hydrogen and oxygen, an apparent quantum yield of 5.4 %, and a solar-to-hydrogen conversion efficiency of 3.8 %. The enhanced performance is attributed to the unique amorphous/amorphous heterojunction structure that promotes effective charge separation, the abundant surface hydroxyl groups that improve proton transport and hygroscopicity, and the formation of photo-induced frustrated Lewis pairs (FLPs). Our findings shed light on the critical role of amorphous structures and surface chemistry in boosting photocatalytic activity, paving the way for the rational design of advanced photocatalysts for overall water vapor splitting.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Qing Chen,Boxin Li,Jie Gu,Long Cheng,Zuhao Wang,Hongfang Du,Ke Wang,Wei Ai,Liangxu Lin
Nitrite (NO2–) is an important nitrogenous compound widely used in the chemical and pharmaceutical industries. The electrochemical reduction of earth-abundant nitrate (NO3–) is an appealing strategy for the sustainable synthesis of NO2–, but its practical use is limited by poor selectivity due to the lack of effective electrocatalysts. Herein, the perovskite hydroxide CuSn(OH)6 is developed as an efficient electrocatalyst for the selective electrosynthesis of NO2– from NO3–. The Cu and Sn cations of CuSn(OH)6 work cooperatively for efficient catalysis, in which the NO3– is preferentially adsorbed by the Sn sites and then catalyzed to NO2– by the Cu sites. Because the robust Sn(OH)6 octahedrons in the perovskite hydroxide prevent the Cu2+ from being reconstructed into metallic Cu with strong hydrogenation activity, further reduction of NO2– is eliminated. Consequently, the efficient and selective conversion of NO3– to NO2– is achieved over Sn(OH)6. Even though the electrode potential is as negative as −0.7 V, CuSn(OH)6 shows a high NO2– yield of 145.8 μmol h–1 mgcat–1 (6851.1 μg h–1 mgcat–1) and selectivity of 97% with excellent stability in 100 mM Na2SO4 electrolyte containing 10 mM NaNO3. This study offers an efficient catalyst for selective electrosynthesis of NO2– from NO3– and also a novel technique for designing and regulating Cu-based catalysts for diverse applications.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jialin Fan,Xiaoxing Ke,Ge Chen,Yong Yan
The industrial synthesis of ethylene glycol (EG) via ethylene oxide hydration is energy-intensive and environmentally harmful due to high greenhouse gas emissions. Although electrochemical oxidation presents a more sustainable route for the direct synthesis of EG from ethylene, existing technologies are hampered by limited catalytic performance stemming from inadequate regulation of the key intermediate, adsorbed hydroxyl radicals (*OH). Herein, we employ a structural engineering strategy to fabricate a PdPtRh trimetallic alloy catalyst by introducing highly electronegative platinum (Pt) and rhodium (Rh) into a palladium (Pd) matrix. By precisely tuning the catalyst’s electronic structure, we effectively optimize the adsorption strength of *OH. Benefiting from this alloying effect, the developed PdPtRh catalyst demonstrates exceptional performance in the ethylene-to-EG conversion, achieving a peak Faradaic efficiency of 52 % and a production rate of 7.61 μmol/cm 2 /h-markedly superior to conventional monometallic Pd catalysts. Density Functional Theory (DFT) calculations further reveal that the alloy structure facilitates charge redistribution among the metals, effectively lowering key energy barriers in the reaction process. This work not only offers a novel design paradigm for developing efficient, eco-friendly catalysts for EG electrosynthesis but also highlights the immense potential of harnessing multimetallic synergistic effects to optimize performance in the field of electrocatalysis.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2012
·Vol. 19
·期 2
·501-508
·
IF 5.925
Jianwei Nai,Zhengbo Chen,Haopeng Li,Fangyuan Li,Yang Bai,Lidong Li,Lin Guo
As the properties of nanomaterials are strongly dependent on their size, shape and nanostructures, probing the relations between macro-properties and nanostructures is challenging for nanoscientists. Herein, we deliberately chose three types of Ni(OH) 2 with hexagonal, truncated trigonal, and trigonal hourglass-like nanostructures, respectively, as the electrode modifier to demonstrate the correlation between the nanostructures and their electrocatalytic performance towards L -histidine. It was found that the hexagonal hourglass-like Ni(OH) 2 sample had the best electrocatalytic activity, which can be understood by a cooperative mechanism: on one hand, the hexagonal sample possesses the largest specific surface area and the tidiest nanostructure, resulting in the most orderly packing on the electrode surface; on the other hand, its internal structure with the most stacking faults would generate a lot of unstable protons, leading to an enhanced electronic conductivity. The findings are important because they provide a clue for materials design and engineering to meet a specific requirement for electrocatalysis of L -histidine, possibly even for other biomolecules. In addition, the hexagonal Ni(OH) 2 -based biosensor shows excellent sensitivity and selectivity in the determination of L -histidine and offers a promising feature for the analytical application in real biological samples. Graphical Structure-dependent performance : Three different types of Ni(OH) 2 with hexagonal, truncated trigonal, and trigonal hourglass-like nanostructures, respectively, were deliberately chosen as electrode modifiers to demonstrate the correlation between the structures and their electrocatalytic performance toward L -histidine (see figure). The electrocatalytic activity of these unique nanostructures depends not only their external architecture, but also on their relevant internal degree of crystallinity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Le Yang,Na Wang,Bairui Tao,Fengjuan Miao,Yu Zang,Paul K. Chu
Palladium (Pd) nanoparticles in combination with naturally abundant materials are stable and highly active catalysts for hydrogen production . Herein, Co(OH) 2 nanosheet arrays are prepared hydrothermally on graphene/nickel foam (graphene/NF) to produce Co(OH) 2 /graphene/NF which provides the desirable three-dimensional (3D) substrate for subsequent Pd electrodeposition to obtain Pd/Co(OH) 2 /graphene/NF. The materials exhibit excellent durability and catalytic performance in the hydrogen evolution reaction (HER) in an alkaline environment such as a low overpotential of 124 mV at 10 mA cm −2 and Tafel slop of 53 mVdec −1 . The excellent performance is attributed to the synergistic catalytic effects rendered by the nanostructured interfaces between the Pd nanoparticles and Co(OH) 2 nanosheet arrays as well as large surface area . The technique and materials have large potential in energy conversion applications.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5130-5141
·
IF 5.726
Shuang Song,Qiuxiang Liu,Jinhui Fang,Weiting Yu
The reductive dechlorination of chlorinated organic compounds (COCs) is very important to reduce the toxicity of waste effluents produced from pharmaceutical, electronics, dyestuff, pesticide, paper, and plastics industries. Electrochemical dechlorination as a green technology under mild reaction conditions is widely used in the reductive dechlorination of COCs using Pd as the electrode. Currently, the challenges of this method are the need to use large Pd loadings and the low dechlorination efficiency. Efforts were made in this work to reduce the loading of Pd and improve the efficiency using 2,4-dichlorophenoxyacetic acid (2,4-D) as a probe molecule for COCs in dechlorination. In this study, Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes were prepared in situ and for the first time applied in the reductive dechlorination of COCs. The results indicate that the dechlorination efficiency of 2,4-D can be enhanced on Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes even at a low Pd loading (<2 mg cm−2). A synergistic effect is found for 2,4-D dechlorination: H* formation on Ni(OH)2 and dechlorination steps on Pd. The enhanced dechlorination efficiency might be related to the shortened transport route between Ni(OH)2 and Pd active centers for H*.
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Small
·
2026
·
IF 11.8
Zhiang Hou,Rui Hu,Yitong Chen,Jinnan Wang,Aimin Li
The spin state of oxygen intermediates constitutes a fundamental limitation to the four-electron oxygen evolution reaction (OER), impeding efficient photoelectrochemical water splitting. Herein, guided by the chiral-induced spin selectivity (CISS) effect, we design a chiral L-Co (3−x) Ni x O 4 /BiVO 4 photoanode that employs a chiral co-catalyst layer to accelerate the evolution of oxidative intermediates. Kinetic isotope experiments, in situ attenuated total reflection Fourier Transform infrared spectroscopy and density functional theory calculations demonstrate that aligning the spin states of charge carriers via chiral molecules facilitates the rapid conversion of * OH to * OOH. Meanwhile, this process effectively suppresses the formation of hydrogen peroxide (Faradaic efficiency < 10%) and improves photoanode stability. Consequently, the L-Co (3−x) Ni x O 4 /BiVO 4 photoanode achieves a photocurrent density of 5.41 mA·cm −2 at a potential of 1.23 V vs. the reversible hydrogen electrode, and maintains stable operation for over 100 h at the working voltage. This work unravels the underlying mechanism by which the CISS effect governs the OER pathway and mediates the formation of key reaction intermediates and provides a viable spin-engineering route to efficient and stable photoanodes.
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