RARE METALS
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2025
·
IF 11
Ren Xiao-Qian,Chen Meng-Xin,Cao Xun,Dai Yu-Long,Yu Wen-Xiao,Liu Zhe,Wen Xin-Xin,Ma Guo-Xin,Guo Bing-Rong,Tan Sze-Xing,Liu Jia,Xu Ping,Gao Jia-Jian,Li Si-Wei
Metal oxohydroxides (MOOH) are widely accepted as the true active species for oxygen evolution reaction (OER). However, the MOOH converted from pre-catalysts usually exhibits better catalytic performance than those directly synthesized. The underlying structural reason for this phenomenon remains controversial. In this work, CoOOH and Co(OH) 2 with similar morphology are employed as model catalysts to investigate the origin of in-situ converted catalyst’s high activity, as Co(OH) 2 can be fully converted to CoOOH during OER. In-situ Raman, electron paramagnetic resonance, HR-TEM, and X-ray spectroscopic studies reveal that O vacancies in the CoOOH converted from Co(OH) 2 play a key role in its higher intrinsic activity towards OER than directly synthesized CoOOH. Furthermore, theoretical calculations and electrochemical methods indicate that O vacancies in CoOOH affect the interaction between Co–O bond, downshift the d-band center of Co, further weaken the adsorption of OH*, and finally facilitate the OER process over CoOOH. This work not only provides a deep understanding of pre-catalyst’s high OER activity by taking Co(OH) 2 as an example but also deliver insights into the activation process of other electrochemical oxidation reactions. Graphical
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Suyu Kong,Meili Ding,Mengjiao Yu,Wei Rong,Yang Wang,Jianfeng Yao
Developing high-efficiency adsorbents with sufficient active species to remove phosphate from wastewater is still a significant and formidable challenge. Herein, a metal-ion modification strategy was developed to construct a series of lanthanum (La 3 + )-functionalized zirconium-based metal-organic frameworks containing different functional groups through a one-step solvothermal process. The investigations for the influence of functional groups of ligands on the resulting La species and the role of La(OH) 3 in the phosphate removal are the primary focuses of this research. Unlike the simple La doping in UiO-66, UiO-66-NH 2 and many previously reported MOF systems, La(OH) 3 was in situ formed during the preparation of La-functionalized UiO-66-OH, which was confirmed by powder X-ray diffraction. At room temperature, the optimized 0.5La-UiO-66-OH, with a molar ratio of La 3+ versus the total metal precursor of 0.5, exhibits a desirable adsorption capacity of 219.6 mg g −1 , exceeding those of UiO-66 (146.8 mg g −1 ), UiO-66-OH (158.9 mg g −1 ), and many reported adsorbents. Besides, reusability tests demonstrate that 0.5La-UiO-66-OH can maintain high adsorption performance (96 %) after five cycles and the practical usability of by 0.5La-UiO-66-OH is confirmed using real lake water. In-depth investigations (X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy) on mechanism unveiled that the adsorption of phosphate by 0.5La-UiO-66-OH involved a combined process of electrostatic attraction and ligand exchange. This research presents the first regulation of generating active La species within MOFs through subtle modification and provides valuable insights for wastewater treatment.
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Materials Today Sustainability
·
2025
·
IF 7.9
Cengceng Du,Yasen Li,Zhenyu Wang,Lei Shi,Xin Chen,Chen Chen,Mingjie Jia,Die Shao,Liping Xie,Yongjian Ai,Hongbin Sun,Guangwen Xu
Efficient hydrogen generation via electrochemical splitting of water at elevated current densities is paramount for its market implementation. Yet, cathodic hydrogen generation, in practical applications, encounters issues such as polarization, which result in energy consumption and sluggishness, thereby limiting its further utilization. In light of this, we have proposed a method for preparing a self-supported Pt-Ni(OH) 2 catalyst-(Pt-Ni(OH) 2 /NF). Specifically, by employing NaBH 4 pretreatment on nickel species to form NiB and Ni 2 B an intermediate, a significant improvement in catalytic performance has been achieved, especially at high current density. The replacement reaction of nickel boride with H 2 PtCl 6 generates rigid strain, leading to the Ni(OH) 2 lattice shrinkage. Upon testing, this catalyst requires only a minimal overpotential of 3 mV to achieve a current density of 10 mA cm -2 , and it achieved an industrial current of 500 mA cm -2 with only 94 mV overpotential. Moreover, even after a 7-day longevity test at 200 mA cm -2 , it still maintained excellent performance.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yan-nan Wang,Jin Li,Zhenyu Yuan,Fanli Meng
An optical fiber toluene gas sensor working at room temperature is proposed based on CQDs@SiO 2 (-OH) porous film. The CQDs@SiO 2 (-OH) porous film was elaborated on the surface of the hollow core fiber (HCF) using the templating method, where the evanescent field is excited by a misaligned structure. The precursor solution formed by mixing CQDs with SiO 2 (-OH) enhances CQDs dispersion within the film, preventing aggregation and preserving active sites. Experimental results indicate that the gas-sensitive layer doped with CQDs demonstrates a sensitivity of 5.1 pm/ppm to toluene gas at room temperature, which is approximately 3.13 times greater than that of the SiO 2 (-OH) porous film. Additionally, it demonstrates a response time of 12 s and a limit of detection (LOD) of 3.9 ppm. The gas sensing mechanism is thoroughly investigated using DFT, exploring the electronic distribution of the gas-sensitive layer before and after CQDs doping and analyzing the sensitization mechanism. This study presents a novel approach for toluene gas detection at room temperature using an optical fiber sensor.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Lingxia Zheng,Lingtong Guan,Jianlan Song,Huajun Zheng
The rational structure design of nanohybrids plays a vital role in the supercapacitor performance of electrode materials . Herein, a novel sandwiched structure based on Ni(OH) 2 and amino-functionalized graphene quantum dots (Ni(OH) 2 /af-GQDs) is prepared via a facile green strategy. The layered Ni(OH) 2 nanosheets are spaced by amino groups from af-GQDs to afford a sandwiched configuration with an enlarged pore diameter of 1.8 nm, which leads to the decrease of random aggregation of Ni(OH) 2 nanosheets and dramatically facilitates the ion transport, thus contributing to the increased surface area and improved electrochemical capacitance . Besides, the introduction of af-GQDs leads to enhanced electrical conductivity and better cycling stability as well as contributing additional electrochemical double-layer capacitance, resulting in an outstanding specific capacitance of 2653 F g −1 at 1 A g −1 . An asymmetric supercapacitor (ASC) based on Ni(OH) 2 /af-GQDs and electrochemical-exfoliated graphene (EG) is assembled, exhibiting a wide potential window range, a high energy density , and an excellent cycling stability with 90.15% capacitance retention. These results definitely demonstrate the great potential of Ni(OH) 2 -based hybrid materials in the development of high-performance supercapacitors .
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FUEL
·
2025
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IF 7.5
Yuyang Xue,Qi Li,Aijuan Xie,Shiping Luo
Water splitting is a key and efficient method for hydrogen production. A major hurdle in overall water decomposition is developing affordable, highly active electrocatalysts to boost hydrogen (HER) and oxygen (OER) evolution reactions. In this work, influence of sulfur/ phosphorus co-doping sequence on the performance of NiFe(OH) x catalyst on the surface of nickel foam (NF) for overall water splitting was investigated. The findings of the experiment indicate that NiFe 0.4 P 1.2 S 1.6 /NF exhibits an overpotential of 67 mV for HER and 106 mV for OER at 10 mA cm −2 . Additionally, the Tafel slopes are reported as 60.92 mV dec -1 and 18.87 mV dec -1 , correspondingly. Electrochemical impedance spectroscopy reveals that NiFe 0.4 P 1.2 S 1.6 /NF exhibits low R ct values: 0.88 Ω for HER and 2.58 Ω for OER. Furthermore, its electrochemical active surface areas measure 303.8 cm 2 (HER) and 121.25 cm 2 (OER). Stability and i-t curve tests confirm the robustness of NiFe 0 . 4 P 1 . 2 S 1 . 6 /NF in HER (86.43 % retention) and OER (75.07 % retention) over 10-hour durability tests, maintaining ∼ 87.11 % initial cell voltage. This sulfur-phosphorus codoping method presents a new strategy for efficient HER/OER electrocatalysts.
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SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Zhi-Hui Xie,Dan Xu,Ya Shu,Qiwen Yong,Liang Wu,Gang Yu
Electroless amorphous nickel (Ni)–phosphorus (P) (Ni P) alloy coatings were successfully achieved on magnesium alloys using an environmentally friendly and facile Mg(OH) 2 conversion film, followed by AgNO 3 activation. The success of the coating was confirmed through scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction characterizations. Electrochemical tests showed that the charge transfer resistance of the newly developed electroless Ni P plating coating, which had a horizontally stacked Mg(OH) 2 nanosheet primer (Mg(OH) 2 /pH 14/ENP), was significantly higher than that with a vertically grown Mg(OH) 2 nanosheet underlayer (Mg(OH) 2 /pH 10/ENP) or that with a phosphate pretreatment (ENP). The measured corrosion current density of the Mg(OH) 2 /pH 14/ENP coating was 1.08 μA cm −2 , one magnitude smaller than that of the ENP coating. Notably, the ENP coating exhibited severe galvanic corrosion , peeling off after only 24 h of the neutral salt spray (NSS) test. In contrast, the Mg(OH) 2 /pH 14/ENP surface showed no visible corrosion cavities or signs of galvanic corrosion even after 120 h of the NSS test or 21 d of exposure to a NaCl solution. These results indicate that the as-prepared coating possesses a strong inhibition capability against galvanic corrosion between the Ni layer and the magnesium alloy, providing long-lasting corrosion protection .
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
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IF 1.795
Mingping He,Wanli Xu,Zhenqiang Dong,Yuechao Wu,Liang Lv
Carbon cloth (CC) is widely used as flexible substrate for supercapacitors , but its space utilization is low. In order to overcome this shortcoming, a new strategy was proposed to fill the gaps and voids in CC by anchoring polyaniline/phytic acid hydrogel (PAH) on CC. Then Co(OH) 2 was electrodeposited on PAH/CC to obtain flexible electrode for supercapacitor. Due to the high mass loading of Co(OH) 2 /PAH (9.83 mg cm −2 ), Co(OH) 2 /PAH/CC provided excellent areal capacitance of 8142.5 mF cm −2 at current density of 5 mA cm −2 . The symmetrical device demonstrated excellent energy density of 201.5 μWh cm −2 at power density of 3000 μW cm −2 , which is larger than those of most devices reported previously. This strategy of anchoring conductive hydrogel network in macroporous frame opens up a new way to fabricate flexible supercapacitor electrode with high areal capacitance and energy density.
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RSC Advances
·
2021
·Vol. 11
·期 57
·36166-36173
·
IF 3.361
Lixiao Han,Cong Peng,Jinming Huang,Shengyao Wang,Xiaohu Zhang,Hao Chen,Yi Yang
Planting highly efficient and low-cost Ni-based noble-metal-free active sites on semiconductors is of great significance in the field of photocatalysis. Herein, taking wide visible-light-responsive 2D C3N5 as a model semiconductor, an impressive near-zero-cost 2D S-doped nickel hydroxide (S–Ni(OH)2) is grown on C3N5 ultrafast within 30 min under ambient conditions by facile reaction between extremely low-cost Ni(NO3)2 and Na2S in aqueous solution. The fabricated 2D S–Ni(OH)2–C3N5 hybrid exhibits enhanced photocatalytic performance for both H2 production from water and NO removal for air purification. The H2 production rate on S–Ni(OH)2–C3N5 is ∼7 times higher than that of Ni(OH)2–C3N5 and even slightly higher than that of Pt–C3N5, demonstrating its potential as a candidate for noble metal catalysts like Pt. In particular, an apparent quantum yield (AQY) value of 30.9% at 420 nm for H2 production is reached on 1.0 wt% S–Ni(OH)2–C3N5 due to quick internal charge transfer efficiency. In addition, ∼42% of NO can be purified in a continuous flow reaction system. This work affords a cost-efficient strategy to steer the photocatalytic property of Ni-based catalysts.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11163-11170
·
IF 8.867
Lifeng Hang,Yiqiang Sun,Dandan Men,Shengwen Liu,Qian Zhao,Weiping Cai,Yue Li
Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres were prepared by two-step treatment (annealing at 600 °C in an Ar atmosphere and then at 250 °C in air) of PS@Co(OH)2 core–shell structures templated from PS microspheres without any modification. In 1 M KOH, such hollow nanospheres showed an overpotential of 352 mV at a benchmark oxygen evolution reaction (OER) current density of 10 mA cm−2, which was lower than that of RuO2 (364 mV), Co3O4 hollow nanospheres (410 mV) and C-Co/Co3O4 nanoparticles (462 mV). Importantly, the C-Co/Co3O4 hollow spheres exhibited a small onset potential (1.49 V) due to their more active sites, higher electrical conductivity, larger specific surface area, and excellent electron and ion diffusion permeability. This work provides a strategy to design and fabricate earth-abundant, low-cost electrocatalysts for water splitting in practical applications.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Pan Liang,Jie Wang,Zhi-Hong Liu
A pure zinc borate, Zn[B 12 O 14 (OH) 10 ], has been synthesized and characterized by XRD, FT-IR, simultaneous TG-DTA techniques, and chemical analysis. The molar enthalpy of solution of Zn[B 12 O 14 (OH) 10 ] (s) in 1 mol·dm −3 HCl(aq) was measured by microcalorimeter at T = 298.15 K. The molar enthalpy of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol·dm −3 HCl(aq) and calculated amount of H 3 BO 3 was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpy of formation of −(9646.6 ± 9.6) kJ·mol −1 at T = 298.15 K was obtained on the basis of an appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −9492.7 kJ·mol −1 for [B 12 O 14 (OH) 10 ] 2− has also been estimated by a group contribution method, which has been used to predict the Δ f H m θ of a series of transition metal borates of M[B 12 O 14 (OH) 10 ] (M II = Mn, Zn, Fe, Co, Ni). These estimated data have been used to further compare the stability of this series of transition metal borates.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Tianbiao Zeng,Jie Lin,Biao Wang,Binbin Guo,Yihong Ding,Chang Q. Sun
In an era where clean energy and sustainability are prioritized, water electrolysis for hydrogen production has become a focus of research. Ti-6Al-4 V alloy (Ti64) may support the catalyst due to its high mechanical strength, electrical conductivity, and resistance to alkali corrosion. However, its poor catalyst adhesion limits its application. Herein, a carbon layer was deposited on Ti64 (Ti64/C), before depositing the Co0.8Ni0.2(CO3)0.5(OH)·0.11H2O (CNCH) nanoneedles. The porous Ti64-H/C/CNCH electrode performs exceptionally well in the oxygen evolution reaction, achieving a current of 10 mA cm–2 at an overpotential of 131 mV with 90% IR compensation. Furthermore, the cell achieves a density of 10 mA cm–2 at 1.83 V and slow degradation after 45 h of continuous operation under overall water-splitting conditions. This study presents a method of fabricating high-performance water electrolysis electrodes by coating the metal surface with a carbon layer under the catalysts.
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