JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Lu Hao,Zhangyou Wang,Jiawen Li,Fangge Cheng,Jia Liu
Advancements in direct methanol fuel cells (DMFCs) have underscored the critical need for efficient electrocatalysts owing to sluggish methanol oxidation reaction (MOR) kinetics. The coupling of Au and Pt regulates Pt electronic structure, enhancing catalytic performance. To further optimize Pt catalytic performance and improve atomic utilization efficiency, we designed an active structure featuring heteronuclear Pt Au atomic pairs coupled with Pt clusters. By carefully controlling the sequence of key synthesis steps, we successfully developed the Pt@Pt-Au/NC-2 catalyst, achieving an optimal mass activity of 4.77 A mg Pt − 1 and specific activity of 4.57 mA cm − 2 , outperforming commercial Pt/C catalysts by 5.81- and 3.20-fold, respectively. Additionally, the catalyst demonstrates exceptional CO tolerance, ensuring excellent long-term stability. Experimental findings integrated with density functional theory (DFT) calculations demonstrate that the electronic effects of the atomic Pt Au pair enhance the CO oxidation rate and the synchronization of the hydroxide-mediated proton coupled electron transfer (HM-PCET) process, thereby facilitating the methanol oxidation reaction. This research not only emphasizes the precise synthesis of advanced atomically dispersed materials but also deepens the understanding of structure-performance relationships in multi-metallic catalytic systems, contributing to a wide range of its applications.
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高影响因子
Engineering
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2025
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IF 11.6
Chao Sun,Tianzuo Wang,Ruijie Gao,Xiaoyang Liu,Kang Xue,Chengxiang Shi,Xiangwen Zhang,Lun Pan,Ji-Jun Zou
Understanding the intrinsic features of dehydrogenation reactions of liquid organic hydrogen carriers (LOHCs) is a formidable challenge due to the combined impact of electronic and geometric effects. Herein, we constructed a series of Pt/MO x catalysts (CeO 2 , MgO, ZrO 2 , TiO 2 , Al 2 O 3 , or SiO 2 ) with similar sizes of Pt (∼1.7 nm) to investigate the effects of Pt electron structures (tuned by electronic metal‒support interactions) on the catalytic dehydrogenation of LOHCs. The results revealed a volcano-shaped correlation between Pt d electrons on different supports and the turnover frequency of catalytic dehydrogenation. Importantly, the Pt/MgO catalyst exhibited the highest dehydrogenation activity. With decreasing d electron content, Pt/MgO increases the bonding orbital dominance of Pt‒C bonds and leads to stable adsorption of H6-monobenzyltoluene (MBT), which facilitates subsequent C‒H bond scission. This study offers insight for the strategic development of high-efficiency dehydrogenation catalysts via d electron density modulation of Pt sites.
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CARBON
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2025
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IF 11.6
Ziyue Han,Wei Deng,Yujie Song,Hailiang Cao,Yongqing Shen,Zhijian Dang,Zhi Zheng,Junjie Guo
Carbon-supported platinum (Pt/C) is the most extensively used electrocatalyst for the oxygen reduction reaction (ORR). However, the electrochemical degradation occurring during operation severely restricts the catalyst's cycling stability, posing a critical obstacle for practical commercialization. Here, we developed a high-performance alternative electrocatalyst consisting of ultrafine Pt nanoparticles embedded in hierarchical porous carbon nanofibers (Pt/PCNF). Importantly, we elucidate a novel micropore confinement effect, demonstrating through DFT calculations that micropores serve as high-surface-area anchoring sites for Pt species, effectively stabilizing them. This unique architecture facilitates ultrahigh Pt dispersion, endowing the catalytic with exceptional stability for pH-universal ORR. Remarkably, the Pt/PCNF catalyst achieves 70 % higher electrochemically active surface area than commercial Pt/C while maintaining 99.4 % of its initial activity after 10,000 durability cycles. Furthermore, when integrated into Zn-air batteries, the catalyst delivers a high open-circuit voltage (1.42 V) and remarkable peak power density (216.73 mW cm −2 ). This work provides fundamental insights into the stabilization mechanisms of Pt-based ORR catalysts through micropore confinement, while demonstrating exceptional performance metrics that meet industrial requirements for fuel cell applications.
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ACS Applied Materials & Interfaces
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2026
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IF 7.8
Tianqi Dai,Su Zhao,Yufei Qiu,Fei He,Tao Jia,Shuming Li,Jiangai Piao,Yanli Wang,Yanping Zhao,Xutong Wu,Hai Xu,Xiaoyu Zheng
Postoperative immunosuppression, which is closely associated with the oxidative-stress-driven expansion of regulatory T cells (Tregs), increases susceptibility to severe postoperative outcomes, including infectious complications, multiple organ dysfunction syndrome (MODS), and tumor progression. Here, we report a zirconium-based metal–organic framework (MOF) cascade nanozyme, designated “Pt@PCN-224-Fe”, coated with poly(ethylene glycol) (Pt@FeMOF–PEG) that simultaneously mimics superoxide dismutase (SOD) and catalase (CAT) to neutralize excessive reactive oxygen species (ROS). Mechanistically, scavenging ROS reactivates the PI3K–AKT–mTOR signaling axis, suppresses Foxp3 expression, and thereby inhibits both the differentiation of naı̈ve CD4+ T cells into Tregs under Treg-polarizing conditions and their TGF-β1 secretion in vitro. In a murine model of surgical trauma, the single intraperitoneal administration of Pt@FeMOF–PEG reversed immunosuppression within 72 h, evident as a reduced frequency of Tregs, expanded Th17 cells, normalized CD4+/CD8+ ratio, and suppressed M2 macrophage polarization (all p < 0.05). Concurrently, proinflammatory cytokines (IL-1β, IL-6, TNF-α, IFN-γ) increased, whereas anti-inflammatory cytokines (IL-4, IL-10) decreased, indicating the systemic reinvigoration of the innate and adaptive immunity. The nanozyme showed excellent biocompatibility, with negligible hemolysis (<5%), no histological organ damage, and minimal systemic toxicity. In this work, we have developed a dual-enzyme-mimicking nanozyme (Pt@FeMOF–PEG) that precisely targets the ROS–PI3K–Treg axis in a single-dose strategy to reverse postoperative immune dysfunction, thus addressing a long-unmet clinical requirement for surgical recovery.
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ACTA MATERIALIA
·
2026
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IF 10.7
Qinghu Guo,Ting Wang,Xiangyu Meng,Dongxu Li,Xiaoyi Gao,Zhonghua Yao,Weiping Gong,Huajun Sun,Hanxing Liu,Hua Hao,Shujun Zhang
Piezoelectric actuators are essential components in precision positioning and force generation systems, often operating under complex multiphysics conditions. In this work, soft-type 2.5%Eu-doped 0.52PMN-0.33PT-0.15PZ piezoelectric ceramics with high piezoelectric charge coefficient d 33 = 1030 pC/N and piezoelectric strain coefficient d 33 * = 1120 pm/V were prepared, the electromechanical properties were systematically investigated under varying electric fields, uniaxial mechanical prestresses and temperatures. The results reveal that the strain exhibits a variation of ≈ 50% over the applied mechanical prestress range of 0 - 50 MPa, while showing a variation of < 20% across the tested temperature range 30 - 120°C. This demonstrates that within the tested ranges, mechanical stress is the dominant external factor governing the electromechanical response. With increasing prestress, the strain initially increases—reaching a maximum of 0.150% at 20 MPa—due to stress-assisted non-180° domain switching, and then decreases under higher stress due to domain wall clamping. This behavior reflects a transition from an electric field-controlled regime (< 20 MPa) to a stress-controlled regime (> 20 MPa), where domain wall mobility is suppressed and temperature-dependent phase transition effect is mitigated. Notably, the ceramic achieved a high mechanical work density of 0.040 J/cm 3 with electromechanical conversion efficiency of 46.4% at 40 MPa, while maintaining excellent temperature stability across all prestress conditions. These findings highlight the critical role of domain switching dynamics and stress-temperature coupling in determining actuator behavior, providing valuable design insights for the development of high-performance piezoelectric actuators with improved durability, reliability, and energy efficiency under extreme operational conditions.
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APPLIED SURFACE SCIENCE
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2026
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IF 6.6
Mengli Han,Peng Gao,Jianhai Wang,Yuesong Shen
While noble metal single atoms (SAs)/semiconductor photocatalysts offer outstanding catalytic performance, challenges related to dosage and stability limit their broader application. In this study, we present a controlled photoreduction strategy that leverages synergistic photoreduction conditions, steric hindrance, and complexation to significantly enhance both activity and stability with an ultra-low Pt loading. The optimized Pt/TiO 2 catalyst (0.0063 wt% Pt) exhibits a 73-fold increase in photocatalytic activity, achieving a Pt mass activity of 6.24 mol/g/h. XPS analysis and DFT calculations reveal that Pt atoms are deposited on TiO 2 via strong interactions resembling an O-Pt-O bond, effectively preventing the migration and aggregation of highly dispersed Pt SAs, thereby significantly improving catalyst stability. Additionally, the ΔG H * for Pt 2+ SAs is nearly 0 (−0.002 eV), enabling rapid H adsorption and H 2 desorption, which imparts the catalyst with exceptional catalytic performance. This study paves the way for the development of catalysts with minimal precious metal content, enhanced efficiency, and extended stability.
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MICROCHEMICAL JOURNAL
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2026
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IF 5.1
Meilin Liu,Yi Duan,Yiyao Luo,Xuhui Xia,Mingyi Guo,Danqun Huo,Changjun Hou
Ochratoxin A (OTA), a prevalent cereal mycotoxin, exhibits carcinogenic and teratogenic properties that threaten public health. Consequently, sensitive and reliable OTA detection methods are critically needed. A CRISPR-Cas12a-mediated colorimetric biosensor was developed, integrating Cas12a regulation via modular hairpin structures with MOF@Pt@MOF nanozyme amplification. Hairpin structures incorporate target-specific sequences; target binding induces rearrangement, preventing Cas12a recognition while enabling dsDNA activators to restore Cas12a function. Magnetic beads (MBs) were coupled with MOF@Pt@MOF nanozymes via ssDNA to construct MBs-MOF@Pt@MOF probes. Following OTA-induced activation, Cas12a cleaves ssDNA, releasing nanozymes into the supernatant, catalyzing TMB oxidation to generate a blue chromophore. A detection limit of 0.055 ng/mL was achieved with excellent selectivity. This approach utilizes inhibitory aptamer conformational changes for precise Cas12a regulation and nanozyme signal amplification to enhance sensitivity and specificity. The modular design demonstrates versatility for diverse target detection in point-of-care testing (POCT) applications.
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Journal of Materials Chemistry A
·
2026
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IF 9.5
Wajeeha Fatima,Jie Chen,Jiujiang Zhao,Ning Zhang,Mengxin Xiao,Huiya Zhang,Qi Chen,Xiong Yin,Minghui Liang
This study demonstrates the separate manipulation of electronic and geometric effects in Pt-Co/C catalysts, where Co single atoms decorate Pt nanoparticles, to solve two issues in ECH selective hydrogenation: dechlorination and ring-opening regioselectivity. We decoupled these effects by synthesizing two model catalysts: Co/C-Pt (for electronic effect) and Pt/C-Co (for geometric effect). The electronic effect, characterized by XPS, enhanced the selectivity of 1-chloro-2-propanol from 80.1% to 96.7%. The geometric effect, confirmed by H₂-O₂ titration, drastically improved the yield of the anti-Markovnikov product (3-chloro-1-propanol) from 0.4% to 41.9%. Combined TPD and DFT calculations reveal that the Co atoms tailor the adsorption properties of Pt and the configuration of adsorbed ECH, which is the origin of the enhanced catalytic performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.3
Li Sun,Qing Guo,Fan Yang,Kexin Wei,Siyuan Sun,Hongchen Liu,Junpu An,Yang Sun,Yang Guo,Linjie Wang,Yongfeng Li
Rationally designing single-atom catalysts (SACs) with high atomic efficiency and excellent catalytic performance is effective for boosting sodium borohydride (NaBH 4 ) hydrolysis activity. Herein, a series of Pt single-atom catalysts supported on Co-based compounds (Pt/CoP-B, Pt/CoP, Pt/Co 3 O 4 -B) were successfully synthesized via wet impregnation method. Pt M /CoP-B (6.2 wt% Pt loading) exhibited optimal performance at 30 °C: a turnover frequency (TOF) of 1103.26 mol H2 min −1 mol −1 Pt , a hydrogen generation rate (HGR) of 10746 mL min −1 g −1 cat which corresponded to 1.46 times higher than Pt M /Co 3 O 4 -B and 1.33 times higher than Pt M /CoP, outperforming most reported noble metal-based catalysts. It also possessed a low activation energy of 31.05 kJ mol −1 and excellent cycling stability, retaining 95.15 % of initial activity after five consecutive cycles. XPS confirmed strong metal-support interaction between Pt single atoms and CoP-B, which inducing electron transfer from Pt to Co to form electron-deficient Pt and electron-rich Co. DFT calculations revealed that Pt/CoP-B imposes a much lower energy barrier for rate-determining B–H bond cleavage and more effectively promotes H 2 O adsorption. This work offers a new paradigm for creating complementary electronic sites via single-atom-support synergy, opening a novel avenue for advanced NaBH 4 hydrolysis catalysts.
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International Journal of Electrochemical Science
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2026
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IF 2.4
Jing Li
Developing cost-effective and highly durable electrocatalysts to overcome the sluggish kinetics of the oxygen reduction reaction (ORR) is critical for the promotion of proton exchange membrane fuel cells (PEMFCs). In this work, a ternary Pd–Pt alloy/WO₃–rGO nanocomposite catalyst was synthesized by a developed two-step chemical reduction method. This strategy enabled the distribution of Pd–Pt alloy nanoparticles very tightly integrated with finely dispersed WOₓ species on conductive rGO support. Structural characterizations confirmed formation of a Pd–Pt alloy phase and strong electronic interactions between the alloy and WOₓ, which resulted in modified surface electronic properties favorable for ORR. Electrochemical characterization revealed that the Pd–Pt–WO₃/rGO catalyst presented the largest electrochemically active surface area (176.29 m² g⁻¹) and superior ORR performance, achieving a mass activity of 83.96 mA mg⁻¹ and a Tafel slope of 70.91 mV dec⁻¹ at 0.9 V vs RHE. The catalyst exhibited superior durability, retaining 94.4% of its initial ECSA after 5000 accelerated cycles, and showed the lowest charge-transfer resistance (0.88 Ω), suggesting its improved conductivity and interfacial charge transfer. The remarkable performance is attributed to the synergistic effects between Pd–Pt alloying, electronic modulation by WOₓ species, and the high conductivity of rGO. These combined features are important for high power density and long stability operability in real PEMFC applications. This study presents a practical pathway for designing high-performance, low-Pt-content catalysts for efficient and durable PEMFCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
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IF 9.7
Weixiang Chen,Yuxiong Wang,Yaoyu Zhang,Yue Liu,Zhongbiao Wu
Ammonia (NH 3 ) has emerged as a promising zero‑carbon energy source for energy and transportation. However, its utilization leads to the emission of NH 3 , which contributes to PM 2.5 formation and disrupts the global nitrogen cycle. Selective catalytic oxidation (SCO) represents a mainstream technology for NH 3 treatment, yet achieving both sufficient activity and high N 2 selectivity across a broad temperature window remains challenging. Here, a core-shell Pt@Cu-ZSM-5 catalyst was employed for NH 3 catalytic abatement by encapsulating metallic Pt clusters (Pt 0 ) inside the channels of Cu ion-exchanged ZSM-5. The optimal sample achieved a complete NH 3 conversion below 250 °C and maintained over 92% N 2 selectivity from 250 to 500 °C due to the synergism between the Pt Cu dual sites. Mechanistic studies revealed that NH 3 oxidation preferentially occurred on Pt 0 sites with excellent redox capacity to produce N 2 O and NO x at relatively low and high temperatures, respectively. And the presence of Cu ions (Cu δ+ ) could efficiently both inhibit the formation of N 2 O on Pt 0 sites and reduce NO x emission, thereby improving the N 2 selectivity. At relatively low temperatures, NH 3 -solvated Cu + (NH 3 ) 2 could migrate to the adjacent Pt sites and reduce the adsorbed NO* species from NH 3 oxidation, damping the formation of N 2 O. At high temperatures, the NO and NO 2 emitted from Pt 0 sites could be reduced on Cu δ+ sites via a typical selective catalytic reduction. This study provides new insights into the rational design of bifunctional SCO catalysts and offers a comprehensive understanding of the synergistic effects in Pt Cu dual-site systems.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Weidong Zhang,Qizhi Dong,Haozi Lu,Bonian Hu,Yong Xie,Gang Yu
Three-dimensional (3D) network structure nanomaterials (NMs) show excellent catalytic performance due to the larger active surface area. A glucose-directed, surfactant-free and one-step direct chemical co-reduction method for synthesis of Pt-Cu alloy nanowires (NWs) under room temperature was demonstrated in present paper. The Pt-Cu NWs were obtained through the co-reduced of CuCl 2 and H 2 PtCl 6 by sodium borohydride in the presence of glucose, the glucose in which not only acted as one-dimensional (1D) growth-directing agent, also as the stabilizing agent. The average diameter of NWs was about 3.1 nm and NWs showed typical face-centered-cubic (fcc) alloy crystal structure. The influence of Pt/Cu ions ratios in precursor solution on the bimetallic composition of NWs had been studied, and NWs displayed the feature of composition-tuning. The electro-catalytic activity of Pt-Cu alloy NWs for ethylene glycol oxidation reaction (EGOR) in alkaline medium was strongly related on their compositions. The Pt 31 Cu 69 NWs exhibited about 1.8 times higher than that of commercial Pt/C and higher durability. The enhanced catalytic performance of Pt-Cu alloy NWs was mainly attributed to their unique 3D network structure and the synergetic effects between Pt and Cu.
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