ChemElectroChem
·
2023
·Vol. 10
·期 16
·e202300184
·
IF 4
Yang Su,Hai-Lin Ren,Shuai Zhao,Ping-Ping Sun,Jia-Qi Li,Xiao-Min Wang
In this paper, [Ni 0.9 Co 0.1 ](OH) 2 precursor is used to dope H 3 BO 3 to synthesize positive electrode material when mixing lithium in wet method, and to explore the best doping by testing the microscopic morphology and electrochemical performance of the positive electrode material amount and calcination temperature. After doping with B, the microstructure of the material is improved, and the primary crystal grains are oriented and agglomerated into a needle shape. This good crystal structure can slow down the generation of grain microcracks and mechanical fracture, and improve the cycle stability of the positive electrode material. After doping B, the discharge specific capacity was slightly improved. When the calcination temperature is 750 °C and the doping amount of B is 1.0 mol%, the first discharge specific capacity reaches 223 mAh g −1 . More importantly, the capacity retention rate of the battery after 100 cycles has been greatly improved, from 74 % without doping B to 87 %. Graphical Li-ion Batteries : The B-doping improves the microstructure of the material, and the primary grains are oriented and agglomerated into a long needle shape. This good crystal structure can slow down the generation of grain microcracks and mechanical breakage, and improve the cycling stability of the cathode material.
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高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Xueyang Song,Li Huang,Wenxue He,Chengyong Liu,Fengchun Hu,Yong Jiang,Zhihu Sun,Shiqiang Wei
Electronic metal–support interactions (EMSIs) have opened a new way to tailor the electronic and catalytic properties of supported catalysts. Herein, we demonstrate the EMSIs between Pt nanoparticles and Co(OH)2 flakes grown on SiO2 and show its beneficial effect on enhancing the CO oxidation activity. The EMSI characteristics of the Pt–Co(OH)2/SiO2 catalyst are identified by in situ X-ray absorption fine structure (XAFS) spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and transmission electron microscopy. Quantitative XAFS analysis reveals the presence of metallic-like Pt–Co bonds. The formation of Pt–Co intermetallic bonds allows for electron donation form Co to Pt, leading to the negative charging of the Pt atoms as evidenced by reduced Pt 2p-to-5d electron-transition intensity detected by XAFS spectroscopy and the emergence of a CO adsorption band at 2063 cm–1 in DRIFTS. The significance of EMSIs is manifested by comparing the CO oxidation activity over the Pt–Co(OH)2/SiO2 and Pt/SiO2 catalysts with similar Pt loadings. Pt–Co(OH)2/SiO2 is superior to Pt/SiO2 in both the apparent activation energy (19 vs 64 kJ/mol) and the turnover frequency (0.03 vs 0.003 s–1 at 37 °C). The enhanced activity is attributed to the negative charging of Pt, which downshifts the d-band center and reduces the CO adsorption strength.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hezheng Sun,Yi Zhao,Changhui Xin,Hao Yang,Xin Yu,Yajie Tian
As a well-known endocrine disruptor, bisphenol A can be detected in natural waters, and the exploration of high-performance photocatalytic systems for bisphenol A removal is of significance for the sustainable development. In this work, self-doped Nb 3 O 7 (OH) architecture with abundant oxygen vacancies were synthesized using a controllable solvothermal method, while the Nb 3 O 7 (OH)-supported AgIO 3 /AgCl heterojunctions were fabricated by leveraging the residual Cl − ions over the surface Nb 3 O 7 (OH) architecture for the degradation of organic pollutants. Additionally, the proportion of AgIO 3 to AgCl over the Nb 3 O 7 (OH) architecture was adjusted by controlling the dosage of NaIO 3 , leading to the successful fabrication of the AgIO 3 /AgCl/Nb 3 O 7 (OH) composites. The AgIO 3 /AgCl/Nb 3 O 7 (OH)-25 % composite demonstrated the highest photocatalytic performance for bisphenol A degradation, achieving a rate constant of 0.02445 min −1 , which was 5.57 times that that of AgCl, 5.61 times that of Nb 3 O 7 (OH) and 163 times that of AgIO 3 , respectively. The AgIO 3 /AgCl/Nb 3 O 7 (OH)-25 % composite achieved a total organic carbon removal efficiency of 68.16 % for bisphenol A mineralization within 100 min under visible-light irradiation, which underscored the potential of AgIO 3 /AgCl/Nb 3 O 7 (OH) composites as effective photocatalysts for the efficient mineralization of organic pollutants. Finally, a reasonable charge transfer mechanism of the AgIO 3 /AgCl/Nb 3 O 7 (OH) composites for bisphenol A degradation were proposed.
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ACS Catalysis
·
2026
·
IF 13.6
Lecheng Liang,Shao Ye,Hengyu Li,Peng Li,Kaiyang Xu,Jinhui Liang,Binwen Zeng,Bo Shen,Taisuke Ozaki,Zhiming Cui
The exploration of advanced CO-free catalysts and clarifying the ambiguous kinetic origins and governing factors would undoubtedly open up opportunities to overcome the sluggish kinetics of methanol electro-oxidation and promote the development of direct methanol fuel cells. Herein, we constructed a family of Bi-modified Pt3M intermetallic catalysts (Bi–Pt3M/C) that follow a CO-free dominated pathway. More significantly, we have identified the pivotal factor governing the reaction kinetics in the CO-free pathway, namely, OH binding energy (OHBE). This is because the rate-determining step (RDS) involves both C–H bond activation and water dissociation, and the energy barriers of these processes are effectively captured by OHBE. Accordingly, OHBE can act as an activity descriptor. Specifically, Bi–Pt3In/C stands out from other Bi–Pt3M/C and delivers the mass activity of 36.7 A mgPt–1 at peak potential, far exceeding state-of-the-art Pt-based catalysts reported to date. Taking Bi–Pt3In/C as a proof of concept, we elucidate the origin of enhanced MOR activity by combining theoretical calculations, kinetic isotope effects, and formaldehyde electrooxidation. Moreover, there exhibits a volcano-type trend between OHBE and the activity of Bi–Pt3M/C. Beyond the discovery of ultrahigh-performance catalysts, these findings provide a detailed mechanistic picture of RDS and offer an innovative design principle for advanced catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Ting Xiao,Fozia Sultana,Xiaojing Liu,Yu Duan,Renkun Li,Kexin Sun,Tongtong Li,Renhong Li
Exploiting low-crystallinity as a structural feature offers a powerful route to unlock new catalytic functionalities by maximizing defect density, tuning electronic structures, and facilitating rapid charge transfer. Moreover, the disordered catalysts are prone to electrochemical reconstruction, generating highly active oxyhydroxide species, thus promoting the catalytic activity. Here, we first prepare a low-crystallinity Ni(OH) 2 /FeOOH heterojunction pre-catalyst directly grown on nickel foam via electrodeposition, followed by electrochemical reconstruction to synthesize the final electrocatalyst with surface-enriched Ni-Fe oxyhydroxide species (ER-Ni(OH) 2 /FeOOH). The defect-rich structure synergistically couples Ni and Fe species, enabling an exceptionally low overpotential of 241 mV at 100 mA cm −2 for the alkaline oxygen evolution reaction (OER), while maintaining stable operation for over 40 h. The density functional theory (DFT) calculations confirm that the low-crystallinity heterointerface tunes the electronic structure and lowers the energy barrier for the rate-determining (RDS) *OH→*O step, thus providing a theoretical basis for the observed enhancement in OER activity. This work underscores the potential of low-crystallinity interface engineering as a powerful approach for constructing next-generation OER catalysts.
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JOURNAL OF HYDROLOGY
·
2026
·
IF 6.3
Bowen Li,Tingting Yang,Shibin Liu,Meng Yao,Jun Dong
The uneven distribution of colloidal Mg(OH) 2 in heterogeneous porous media poses a significant challenge for its effective application in groundwater remediation. To address this issue, this study introduces a novel approach using xanthan gum (XG) as a viscosity modifier to enhance the migration of colloidal Mg(OH) 2 into low permeability zone. Results indicate that XG is highly compatible with colloidal Mg(OH) 2 , viscosity modified colloidal Mg(OH) 2 (VMC-Mg(OH) 2 ) exhibits significant shear thinning properties. The increased viscosity effectively reduces the deposition of colloidal Mg(OH) 2 and facilitates its return to groundwater. With the addition of XG to the system, the collision efficiency ( η ) between colloidal Mg(OH) 2 and porous media decreased from 0.00865 to 0.00142, while the attachment efficiency ( α ) was reduced from 0.4858 to 0.1038. These variations notably enhance the migration performance of colloidal Mg(OH) 2 , with C/C 0 increasing from 0.12 to 0.94. The incorporation of XG also leads to a substantial increase in colloidal Mg(OH) 2 sweep efficiency in low permeability zone, rising from 53.6 % to 92.5 % as the XG concentration increased from 0 mg/L to 200 mg/L. Moreover, the simulation of collision efficiency ( η ) and attachment efficiency ( α ) accurately predicts the migration of VMC-Mg(OH) 2 in heterogeneous porous media, with a maximum error of 5.39 %. These findings highlight the significant potential of VMC-Mg(OH) 2 as a reactive reagent for remediating contamination in low permeability zone
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ACS Applied Energy Materials
·
2026
·
IF 5.5
Chenyang Fan,Haiwen Tan,Jin Gan,Chunyan Han,Yikun Cheng,Liyang Xiao,Rui Zhang,Pengfei Yin,Cunku Dong,Hui Liu,Xiwen Du,Jing Yang
Platinum-based noble metal cathodes employed in industrial alkaline water electrolyzers are highly susceptible to iron impurities present in the alkaline electrolyte, which significantly shorten their operational lifetime. In this work, a facile alloying strategy was developed to construct ternary PtNiCu and PtNiFe electrodes using nickel foam (NF) as the substrate. The incorporation of Cu or Fe as a third metal effectively modulates the electronic structure of Ni sites in the PtNi alloy, inducing a downward shift of the Ni d-band center. This electronic regulation weakens OH- adsorption on Ni sites, thereby suppressing surface hydroxyl accumulation and reducing the nucleation and deposition of iron species in the form of iron oxides. As a result, the stability of the electrodes in the Fe-containing alkaline electrolyte is markedly enhanced. Both ternary alloys exhibit substantially improved durability compared with pristine PtNi under Fe-contaminated conditions. Among them, PtNiCu delivers a lower initial overpotential, whereas PtNiFe demonstrates superior long-term stability. After 12 h of hydrogen evolution reaction operation at 400 mA cm−2 in a 6.0 M KOH electrolyte containing 5 ppm FeCl2 at 80 °C, the overpotentials of PtNiCu and PtNiFe are reduced by 152 and 151 mV, respectively, relative to PtNi. Moreover, the amount of deposited iron oxides on PtNiCu and PtNiFe is only about 50 and 25% of that on PtNi, respectively, confirming their much stronger resistance to Fe-induced deactivation.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·Vol. 60
·期 32
·22813-22822
·
IF 12.2
Gao Jigang,Liu Peiqi,Huang Yukai,Hu Yulong,Zhou Zhongyue,Yuan Wenhao,Zeng Meirong
Lipid oxidation driven by intermolecular interactions
plays a pivotal
role in human aging and indoor environmental quality, yet the underlying
interaction mechanisms remain largely elusive. Here, we uncover a
coupled autoxidation network in the heterogeneous co-ozonolysis of
model skin lipids (cholesterol and fatty acids), using online atmospheric
pressure photoionization coupled with an ultrahigh-resolution mass
spectrometer. Individual cholesterol exhibited extremely low heterogeneous
reactivity (determined as effective uptake coefficient, γ eff, Chol = 2.94 × 10 –6 ). However,
upon co-ozonolysis with fatty acids (oleic or linoleic acid), its
reactivity was enhanced by 31-fold (γ eff, Chol = 9.11 × 10 –5 when mixed with linoleic acid),
and elevated relative humidity further amplified this effect by an
additional 3-fold. The identification of α-alkoxyalkyl hydroperoxides,
α-acyloxyalkyl hydroperoxides, hydroxyalkyl hydroperoxides,
and secondary ozonides provides direct molecular evidence that Criegee
intermediates (CIs) drive the co-ozonolysis interaction network. Furthermore,
the detection of highly oxygenated molecules reveals that • OH reactions are triggered by CIs and hydroperoxide decomposition,
establishing a free-radical chain propagation pathway that further
accelerates autoxidation. We propose a novel interactive lipid autoxidation
mechanism: initiated by lipids’ co-ozonolysis, propagated via
CI-driven interactions, and amplified by • OH-mediated
radical chemistry. These findings unveil a coupling mechanism of CIs
and • OH pathways in governing the heterogeneous
reactivity of naturally coexisting lipids, providing fundamental insights
into their impacts on biological aging and environmental evolution.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zihao Guo,Zeqi Liu,Chaoxuan Wang,Lei Qian
Here, oxygen vacancy was introduced into hexagonal β-Ni(OH) 2 (NV) nanosheets to prepare poly (vinylidene fluoride-co-hexafluoropropylene)-based dielectric composites. Oxygen vacancy gradients were controlled, and the enhanced effects on energy storage performance were systematically investigated. It was found that the oxygen vacancy elevated the Ni 2+ /Ni 3+ ratio, shifted the Fermi level downward and induced formation of deep trap states. The moderate oxygen vacancies produced uniformly distributed deep strap states, which delayed the carrier migration by the capture-release mechanism. The Fermi level (E v − E f ) of NV 1.5 was 1.064 eV and showed the smallest energy separation from the valence-band, resulting in the highest interfacial potential barrier and inhibiting the charge injection. So, the oxygen vacancy obviously affected leakage current, breakdown strength and energy density. It was observed that leakage current density of the composites reduced to 3.48 × 10 −8 A/cm 2 . At the 0.3 wt% loading of NV1.5, the composite achieved a breakdown strength of 792.97 kV/mm and an energy density of 21.15 J/cm 3 (88.17 % over the matrix), with charge–discharge efficiency of 74.12 % and below 1 % performance degradation after 10 4 cycles. This work establishes a novel route based on defect engineering for dielectric storage materials at the atomic level. Download: Download high-res image (101KB) Download: Download full-size image
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Fengling Jiang,Ziwei Lan,Yongzheng Ma,Yuan Zhang,Xiaoqing Li,Dickon H.L. Ng,Jia Li
Micro/nanomotors have demonstrated significant potential in environmental monitoring and water remediation owing to their enzyme-like catalytic properties and self-driven ability. Herein, we developed a conical Co(OH) 2 @MnO 2 micromotor through an integrated oil bath-hydrothermal synthesis strategy. The micromotors feature MnO 2 nanosheets arranged in a two-dimensional cross-array architecture on their microconical surfaces, which effectively catalyze H 2 O 2 decomposition to produce oxygen bubbles, enabling robust self-propulsion. The speed of the micromotor can reach 138.59 ± 2.03 μm/s in7 wt% H 2 O 2 solution. The combination of excellent enzyme-like activity and self-driven ability of micromotor constructs a dynamic sensitive detection platform for resveratrol (RES, 3,4′,5-trihydroxystilbene), a potential pollutant in water, with a low concentration detection limit of 0.23 μM. In addition, hydrogen peroxide and peroxymonosulfate (PMS) were used as catalytic substrates to catalyze the micromotor to generate various reactive oxygen species (ROS), thus achieving efficient synergistic degradation of resveratrol. Under neutral pH conditions, the degradation rate of resveratrol by the micromotors was 91.6% within 40 min. This study provides an intelligent strategy for developing dynamic sensors with the dual functions of detecting and degrading RES simultaneously.
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高影响因子
AICHE JOURNAL
·
2026
·
IF 4.4
Quanqi Zhang,Zhonghua Jiang,Bo Yang,Binbin He,Ye Yang,Yucai Qin,Jian Zheng,Yi Mei,Yun Zu
Alloying Ni with another metal on γ-Al 2 O 3 support holds considerable promise to enhance carbon-resistance in dry reforming of methane (DRM), yet its effectiveness is constrained by poorly controlled alloy structure and surface Al-OH groups. Herein, bimetallic NiCo/γ-Al 2 O 3 catalysts were designated using electropositive NiCo complexes via a strong electrostatic adsorption strategy. The NiCo alloy and oxygen vacancy were primarily derived from the evolution of surface Al- μ 2 -OH and Al- μ 3 -OH groups anchored NiCo layered structures. The optimized Ni 3.0 Co 3.0 Al catalyst achieved near-thermodynamic-equilibrium CH 4 and CO 2 conversions, along with ultra-low coke deposition rate (0.03 mg coke ·g cat −1 ·h −1 ) after 200 h on-stream at 600°C. Microkinetic and in situ FTIR studies elucidated the reaction mechanism, wherein CH x * species from CH 4 decomposition on atomically uniform NiCo alloys were rapidly eliminated by surface Al–OH and reactive O* generated from CO 2 dissociation on limited oxygen vacancies, forming labile HCOO* and CH x O* intermediates, while effectively suppressing the Boudouard reaction, thereby ensuring exceptional catalyst longevity.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Yuqian Gao,Haotian Tan,Wenxue Chen,Jinlin Wang,Fan Luo,Hongfu Gao,Maierwaiti Jimosi,Xiaoyuan Zeng
The development of highly efficient and low-cost bifunctional catalysts is pivotal for the large-scale commercialization of water electrolysis technology. A solvothermal method was used to fabricate the bifunctional Ir 0.1 Ni/Ni(OH) 2 electrocatalyst, utilizing Ni(OH) 2 which served as both the support and the nickel (Ni) source for the in-situ formation of IrNi alloy nanoparticles via co-reduction. The significant electronegativity difference between iridium (Ir) and Ni induced electron transfer from Ni to Ir at the alloy interface, resulting in substantial interfacial electronic reconstruction. This electronic synergy optimally regulated the bifunctional activity: the electron-rich Ir sites facilitated the adsorption of hydrogen intermediates, enhancing the hydrogen evolution reaction; whereas the electron-deficient Ni sites strengthened the adsorption of hydroxyl and oxygen intermediates (OH, OOH*), significantly lowering the energy barrier for the oxygen evolution reaction. Therefore, this catalyst exhibits excellent activity and stability in both the OER and the HER. In a 1.0 M KOH solution at a current density of 10 mA cm −2 , the HER requires an extremely low overpotential of only 31 mV, while the OER requires 270 mV. Moreover, Ir 0.1 Ni/Ni(OH) 2 serves as an electrocatalyst for overall water splitting in alkaline media. This research provides a simple and effective strategy for designing advanced alloy catalysts for sustainable energy conversion.
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