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
·
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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PubMed
高影响因子
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
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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Reaction Kinetics Mechanisms and Catalysis
·
2026
·
IF 2.1
Hu Yanan,Yang Dawei,Li Qiaoling,Yu Chengcheng
Herein, a Cr-doped Ni-Cu/(NiOH) 2 coating supported on nickel foam (Ni-Cu-Cr/NF) was fabricated via a facile one-step electrodeposition strategy and employed as an efficient electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. In 1 M NaOH, Ni–Cu–Cr/NF requires an overpotential of 30 mV to reach a current density of − 10 mA cm⁻ 2 and exhibits a Tafel slope of 55 mV dec⁻ 1 . These electrochemical results are associated with the combined effects of the multicomponent composition and an increased electrochemically active surface area (ECSA). The ECSA of Ni–Cu–Cr/NF is approximately 23.6 times that of Ni–Cu/NF. In addition, the catalyst maintains stable operation for 60 h during continuous electrolysis. This work presents a simple preparation method for the novel Ni-Cu-Cr/NF catalyst and systematically investigates the impact of Cr doping on enhancing catalytic performance, providing an effective strategy for the development of nickel-based alloy electrocatalysts. Graphical
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ACS Catalysis
·
2026
·
IF 13.6
Yu-Jun Xu,Chiao-An Hsieh,Chen-Yu Zhang,Li-Dan Zhang,Han Tang,Lu-Lu Zhang,Jun Cai,Yan-Xia Chen,Shuehlin Yau,Zhi-Feng Liu
Electrochemical energy and substance conversion devices involve complex electrode processes characterized by multiple charge transfer steps, competing pathways, and various intermediates. Such complexity makes it challenging to enhance the electrocatalytic activity. The prevailing strategy typically focuses on optimizing the geometric and electronic structures of the electrocatalysts to align the adsorption energies of reaction intermediates with the peak of the activity Volcano curve. In this study, we demonstrate that surface decoration can effectively shape the micro reaction environment for the model system of the oxygen reduction reaction (ORR) on Pt electrodes. By applying a partial hydrophobic I* adlayer on the Pt surface, we can shift the equilibrium of OH* reduction and weaken H2O* adsorption, which significantly enhances ORR kinetics. With in situ scan tunneling microscopy (STM) and theoretical calculations, our study reveals the formation of isolated Pt2 surface units situated in a hydrophobic valley surrounded by adsorbed iodine atoms. This minimalist Pt2 active unit exhibits significantly greater activity for the ORR compared to an extended Pt surface. Our results overturn the previous consensus that the I* adlayer always poisons the electrocatalytic reaction. Our systematic studies also reveal that whether I* acts as a poison or a promoter, as well as the extent of its promotional effect, depends on its coverage. This finding could pave the way for developing highly efficient catalysts with potential applications in fuel cell technology and metal air batteries and extension to other electrochemical conversion reactions such as ammonia synthesis and CO2 reduction.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Chao Chen,Meng-Han Li,Ya-Yun Ma,Guo-Zhi Han
Photo-deposition method has the advantages of simplicity, environmental friendliness, and high efficiency, and has been widely used in the field of materials preparation. In this paper, we firstly prepared hollow black TiO 2 microspheres by template method, then using the mesoporous hollow microspheres as a carrier, NiCl 2 ·6 H 2 O as raw material, a novel kind of hollow Ni(OH) 2 @TiO 2 composite microspheres was prepared by photochemical deposition. Characterization of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), fluorescence spectrophotometry (PL), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) indicated that the two units of TiO 2 and Ni(OH) 2 in the composite hollow microspheres form tightly chemical connections. More importantly, this chemical connection endowed the two functional units with mutually enhanced catalytic performance for reduction of aromatic nitro compounds and photocatalytic degradation of emerging organic pollutants. For example, it can catalyze the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH 4 with a k value of 0.8457 min −1 , as well as degrade tetracycline hydrochloride (TCH) with a degradation rate of 92.29% within 60 min with a k value of 0.0606 min −1 , which is superior to most previous reports. Finally, based on a series of control experiments, a plausible mutually enhanced catalytic mechanism was 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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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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