NEW CARBON MATERIALS
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2024
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IF 6.5
Xiao-li Yan,Kui Wang,Shu-wei Hao,Guang-da Zhou,Hao-wei Yang,Hua Zhang,Jun-jie Guo
Exploring cost-efficient and highly-efficient noble metal-free catalysts for the oxygen reduction reactions (ORRs) involved in sustainable energy devices remains a great challenge. Transition-metal phosphides supported on heteroatom-doped carbons have shown potential as alternative candidates for precious metals because of their tunable electronic structures and higher catalytic performance. Phosphating was used to construct CoP nanoparticles (NPs) anchored on a nitrogen-doped porous carbon framework (CoP@NC) from Co NPs loaded on NC, using PH 3 gas released from NaH 2 PO 2 during heat treatment. The dodecahedral structure of Co NPs was retained in their transformation to CoP NPs. The CoP@NC electrocatalyst shows a remarkable ORR activity with a half-wave potential up to 0.92 V under alkaline conditions, which is attributed to the combined coupling between the well dispersed CoP nanoparticles on the nitrogen-doped carbon and the efficient mass transport in the porous structure. Zinc-air batteries assembled with the CoP@NC electrocatalyst as a cathode have a high open-circuit voltage of 1.51 V and power density of 210.1 mW cm −2 . This work provides a novel strategy to develop low-cost catalysts with an excellent ORR performance to promote their practical use in metal-air batteries
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2024
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IF 4.7
Xiao-qing LU,Ai-min LIU,Feng-guo LIU,Xian-wei HU,Zhong-ning SHI
The feasibility and reaction mechanism of NdFeB film electrodeposition in 1,3-dimethyl-2-imidazolidinone (DMI)−LiNO 3 ionic liquid analogs at room temperature were investigated. Cyclic voltammetry indicated that the reduction peak at −1.83 V (vs Ag) was related to the reduction of Fe(II) to Fe, while the reduction peak at −2.01 V (vs Ag) was related to the reduction of B(III) to B. The electrochemical reduction reaction of Fe(II) and B(III) were irreversible processes controlled by diffusion, and the diffusion coefficients of Fe(II) and B(III) at 313 K were 3.03×10 −6 and 6.74×10 −7 cm 2 /s, respectively. In addition, XRD analysis suggested that the product obtained by the electrodeposition in DMI−LiNO 3 −Nd(CF 3 SO 3 ) 3 −FeCl 2 −H 3 BO 3 ionic liquid analogs for 2 h on the Al substrate contained NdFe 3 B 3 . SEM and EDS analysis showed that Nd, Fe, and B in the cathode product were uniformly distributed. XPS analysis revealed that the mass fractions of Nd, Fe, and B on the W substrate were 27.44%, 27.90%, and 7.51%, respectively.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Shuang Li,Haili Lin,Xuemei Jia,Xin Jin,Qianlong Wang,Xinyue Li,Shifu Chen,Jing Cao
Although bimetallic phosphide cocatalysts have attracted considerable interest in photocatalysis research owing to their advantageous thermodynamic characteristics, superstable and efficient cocatalysts have rarely been produced through the modulation of their structure and composition. In this study, a series of bimetallic nickel-iron phosphide (Ni x Fe 2– x P, where 0 < x < 2) cocatalysts with controllable structures and overpotentials were designed by adjusting the atomic ratio of Ni/Fe onto nonmetallic elemental red phosphorus (RP) for the photocatalytic selective oxidation of benzyl alcohol (BA) coupled with hydrogen production. The catalysts exhibited an outstanding photocatalytic activity for benzaldehyde and a high H 2 yield. The RP regulated by bimetallic phosphide cocatalysts (Ni x Fe 2– x P) demonstrated higher photocatalytic oxidation-reduction activity than that regulated by monometallic phosphide cocatalysts (Ni 2 P and Fe 2 P). In particular, the RP regulated by Ni 1.25 Fe 0.75 P exhibited the best photocatalytic performance. In addition, experimental and theoretical calculations further illustrated that Ni 1.25 Fe 0.75 P, with the optimized electronic structure, possessed good electrical conductivity and provided strong adsorption and abundant active sites, thereby accelerating electron migration and lowering the reaction energy barrier of RP. This finding offers valuable insights into the rational design of highly effective cocatalysts aimed at optimizing the photocatalytic activity of composite photocatalysts.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Xiao Chen,Yunmei Du,Yu Yang,Kang Liu,Jinling Zhao,Xiaodan Xia,Lei Wang
ABSTRACT Directional construction of crystalline/amorphous (c/a)-phosphosulfide heterostructures with exceptional intrinsic activity through a facile strategy is challenging. In this study, we synthesized q-CoPS nanorods with a unique c/a-CoPS core-shell heterostructure through the ‘gas-phase phosphorus vulcanization-quenching' treatment. This work also innovatively masters the regulation of the initial quenching temperature to alter the c/a ratio of the CoPS nanorods . Surprisingly, with increasing initial quenching temperature, the area of the amorphous CoPS shell gradually increases. Density functional theory calculations reveal that the Co sites at the c/a-heterointerface, as the difunctional c/a-interface active site, effectively optimize the kinetics of the hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR). As anticipated, q-CoPS/CF requires an overpotential of only 90 mV at a current density of 1000 mA cm –2 for the alkaline HER, which is much lower than that required using the state-of-the-art Pt/C catalyst. Additionally, q-CoPS/CF achieves a current density of 1000 mA cm –2 at only 0.06 V in the HzOR. Overall, this work proposes an efficient strategy for developing a bifunctional electrocatalyst with a unique c/a-heterostructure to address future energy needs.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Yanbin Qi,Yihua Zhu,Hongliang Jiang,Chunzhong Li
Designing efficient, stable, and easily scaled-up catalysts for nucleophile oxidation reactions (NOR) is a key step in promoting the industrial application of NOR. Here, a simple physical mixing strategy is adopted to prepare a mixture of NiMo oxide and CoMo oxide as catalyst for methanol electrocatalytic oxidation reaction (MOR). The mixture exhibits high catalytic activity for MOR and its performance far exceeds that of a single component. The interaction at the contact interface between nickel and cobalt components is clarified through operando electrochemical impedance spectroscopy, in-situ Raman spectroscopy, and a series of electrochemical tests. The interfacial interaction enhances the charge transport and promotes the formation of electrophilic OH* species, which significantly boosts the methanol oxidation reaction. This work provides a new idea for the design of efficient and easily scaled-up catalysts for nucleophile oxidation reactions.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Ziwen Mei,Kejun Chen,Yao Tan,Qiuwen Liu,Qin Chen,Qiyou Wang,Xiqing Wang,Chao Cai,Kang Liu,Junwei Fu,Min Liu
ABSTRACT Electrocatalytic CO 2 reduction reaction (CO 2 RR) holds significant promise for sustainable energy conversion, with cobalt phthalocyanine (CoPc) emerging as a notable catalyst due to its high CO selectivity . However, CoPc's efficacy is hindered by its limited ability to provide sufficient proton for the protonation process, particularly at industrial current densities . Herein, we introduce defect-engineered carbon nanotubes (d-CNT) to augment proton feeding for CO 2 RR over CoPc, achieved by expediting water dissociation. Our kinetic measurements and in-situ attenuated total reflection surface-enhanced infrared absorption spectroscopy reveal d-CNT significantly enhances proton feeding, thereby facilitating CO 2 activation to *COOH in CoPc. Density functional theory calculations corroborate these findings, illustrating that d-CNT decreases the barrier to water dissociation. Consequently, the CoPc/d-CNT mixture demonstrates robust performance, achieving 500 mA cm –2 for CO 2 RR with CO selectivity exceeding 96%. Notably, CoPc/d-CNT remains stability for a duration of 20 h under a substantial current density of 150 mA cm –2 . The study broadens the scope of practical applications for molecular catalysts in CO 2 RR, marking a significant step towards sustainable energy conversion.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2024
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IF 15.7
Chao Li,Shuo Wang,Yuan Liu,Xihe Huang,Yan Zhuang,Shuhong Wu,Ying Wang,Na Wen,Kaifeng Wu,Zhengxin Ding,Jinlin Long
ABSTRACT Covalent organic frameworks (COFs) are promising materials for converting solar energy into green hydrogen. However, limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction (HER). In this study, the intrinsically tunable internal bond electric field (IBEF) at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field (IMEF) induced by the donor-acceptor (D-A) structure for an efficient HER. The aligned orientation of IBEF and IMEF resulted in a remarkable H 2 evolution rate of 57.3 mmol·g –1 ·h –1 on TNCA, which was approximately 520 times higher than that of TCNA (0.11 mmol·g –1 ·h –1 ) with the opposing electric field orientation. The superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer, kinetically facilitating the migration of photogenerated electrons from D to A. Furthermore, theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only provides a strong driving force for carrier transfer but also effectively hinders the return of free electrons to the valence band, improving the utilization of photoelectrons. This strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Huangli Yan,Chengwen Yu,Xianming Zhang,Meihua Tang,Shengli Chen
The large-scale commercialization of proton exchange membrane fuel cells (PEMFCs) has been hindered by the high demand of platinum (Pt) in the cathode due to the sluggish kinetics of the oxygen reduction reaction. Reducing the amount of Pt would worsen the problems caused by the adsorption of perfluorinated sulfonic acid (PFSA) ionomers to Pt via the side chains, namely, blocking the active sites of Pt and inducing densely packed layers of fluorocarbon backbones on Pt surface to obstruct local O 2 transport at the Pt/PFSA interfaces. This work aims at optimizing the Pt/ionomer interface to mitigate the sulfonate adsorption and in the meantime to reduce the local O 2 transport resistance ( R local ), by using a porous composite of 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid (IL) modified MOF-808 (BMImHSO 4 @MOF-808) as additive in cathodic catalyst layer (CCL). Through detailed physical, spectroscopic and electrochemical characterizations, we demonstrate a three-fold optimization mechanism of Pt/ionomer interface structure by BMImHSO₄@MOF-808: the unsaturated metal sites in MOF-808 effectively inhibit the sulfonate adsorption on Pt through coordination with the sulfonates of PFSA, thereby improving catalyst utilization; the pores in MOF-808 establish efficient transport channels for gaseous oxygen, significantly reducing R local ; the IL modification layers facilitate the formation of continuous proton transport networks, increasing proton conductivity. The incorporation of BMImHSO₄@MOF-808 in a low-Pt CCL (0.1 mg Pt cm –2 ) yields a peak power density of 1.9 W cm –2 for PEMFC under H 2 -O 2 condition, and ca. 20% increase of power density under H 2 -air condition as compared with conventional CCL, indicating the prospect of IL-MOF composites as an efficient additive to enhance the performance of PEMFCs.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Dan Yang,Xiang Cui,Zhou Xu,Qian Yan,Yating Wu,Chunmei Zhou,Yihu Dai,Xiaoyue Wan,Yuguang Jin,Leonid M. Kustov,Yanhui Yang
The electrocatalytic oxidation of glycerol toward formic acid is one of the most promising pathways for transformation and utilization of glycerol. Herein, a series of well-defined Ni n (SR) 2 n nanoclusters ( n = 4, 5, 6; denoted as Ni NCs) were prepared for the electrocatalytic glycerol oxidation toward formic acid, in which Ni 6 -PET-50CV afforded the most excellent electrocatalytic performance with a high formic acid selectivity of 93% and a high glycerol conversion of 86%. This was attributed to the lowest charge transfer impedance and the most rapid reaction kinetics. Combined electrochemical measurements and X-ray absorption fine structure measurements revealed that the structures of Ni NCs remained intact after CV scanning pretreatment and electrocatalysis via forming the Ni–O bond. Additionally, the kinetic studies and in-situ Fourier transformed infrared suggested a sequential oxidation mechanism, in which the main reaction steps of glycerol → glyceraldehyde → glyceric acid were very rapid to produce a high selectivity of formic acid even though the low glycerol conversion. This work presents an opportunity to study Ni NCs for the efficient electrocatalytic oxidation of biomass-derived polyhydroxyl platform molecules to produce value-added carboxylic acids.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Zhouzhou Wang,Qiancheng Zhou,Li Luo,Yaran Shi,Haoran Li,Chunchun Wang,Kesheng Lin,Chengsi Wang,Libing Zhu,Linyun Han,Zhuo Xing,Ying Yu
Neutral oxygen evolution reaction (OER) is a crucial half-reaction for electrocatalytic chemical production under mild condition, but with limited development due to low activity and poor stability. Herein, a tungsten-doped cobalt molybdate (WDCMO) catalyst was synthesized for efficient and durable OER under neutral electrolyte. It is demonstrated that catalyst reconstruction is suppressed by W doping, which stabilizes the Co-O-Mo point-to-point connection in CoMoO 4 architecture and stimulates to a lower valence state of active sites over the surface phase. Thereby, the surface structure maintains to avoid compound dissolution caused by over-oxidation during OER. Meanwhile, the WDCMO catalyst promotes charge transfer and optimizes *OH intermediate adsorption, which improves reaction kinetics and intrinsic activity. Consequently, the WDCMO electrode exhibits an overpotential of 302 mV at 10 mA cm –2 in neutral electrolyte with an improvement of 182 mV compared with CoMoO 4 electrode. Furthermore, W doping significantly improves the electrode stability from 50 h to more than 320 h, with a suppressive potential attenuation from 2.82 to 0.29 mV h –1 . This work will shed new light on designing rational electrocatalysts for neutral OER.
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高影响因子
Chinese Journal of Natural Medicines
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2025
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IF 4.9
Qian Chen,Shuying Zhang,Xuanxi Jiang,Jie Liao,Xin Shao,Xin Peng,Zheng Wang,Xiaoyan Lu,Xiaohui Fan
Coptis chinensis Franch. and Panax ginseng C. A. Mey. are traditional herbal medicines with millennia of documented use and broad therapeutic applications, including anti-diabetic properties. However, the synergistic effect of total alkaloids from Coptis chinensis and total ginsenosides from Panax ginseng on type 2 diabetes mellitus (T2DM) and its underlying mechanism remain unclear. The research demonstrated that the optimal ratio of total alkaloids from Coptis chinensis and total ginsenosides from Panax ginseng was 4∶1, exhibiting maximal efficacy in improving insulin resistance and gluconeogenesis in primary mouse hepatocytes. This combination demonstrated significant synergistic effects in improving glucose tolerance, reducing fasting blood glucose (FBG), the weight ratio of epididymal white adipose tissue (eWAT), and the homeostasis model assessment of insulin resistance (HOMA-IR) in leptin receptor-deficient (db/db) mice. Subsequently, a T2DM liver-specific network was constructed based on RNA sequencing (RNA-seq) experiments and public databases by integrating transcriptional properties of disease-associated proteins and protein-protein interactions (PPIs). The network recovery index (NRI) score of the combined treatment group with a 4∶1 ratio exceeded that of groups treated with individual components. The research identified that activated adenosine 5’-monophosphate-activated protein kinase (AMPK)/acetyl-CoA carboxylase (ACC) signaling in the liver played a crucial role in the synergistic treatment of T2DM, as verified by western blot experiment in db/db mice. These findings demonstrate that the 4∶1 combination of total alkaloids from Coptis chinensis and total ginsenosides from Panax ginseng significantly improves insulin resistance and glucose and lipid metabolism disorders in db/db mice, surpassing the efficacy of individual treatments. The synergistic mechanism correlates with enhanced AMPK/ACC signaling pathway activity.
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PubMed
高影响因子
Chinese Journal of Natural Medicines
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2022
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IF 3.887
Jing WEN,Yuan-Qiang ZHANG,Dong-Qing LIU,Xu-Tao YAO,Hua JIANG,Yu-Bin ZHANG
Parkinson’s disease (PD) is a multifactorial disorder of the nervous system where a progressive loss of dopaminergic neurons exist. However, the pathogenesis of PD remains undefined, which becomes the main limitation for the development of clinical PD treatment. Demethylenetetrahydroberberine (DMTHB) is a novel derivative of natural product berberine. This study was aimed to explore the neuroprotective effects and pharmacological mechanism of DMTHB on Parkinson’s disease using C57BL/6 mice. A PD model of mice was induced by administration of MPTP (20 mg·kg —1 ) and probenecid (200 mg·kg —1 ) twice per week for five weeks. The mice were administered with DMTHB daily by gavage at the dose of 5 and 50 mg·kg —1 for one- week prophylactic treatment and five-week theraputic treatment. The therapeutic effects of DMTHB were evaluated by behavior tests (the open field, rotarod and pole tests), immunohistochemical staining of tyrosine hydroxylase (TH), Nissl staining and biochemical assays. The molecular mechanisms of DMTHB on the key biomarkers of PD pathological states were analyzed by Western blot (WB) and qRT-PCR. DMTHB treatment alleviated the behavioral disorder induced by MPTP-probenecid. Nissl staining and TH staining showed that the damage of dopaminergic neurons in the substantia nigra was remarkably suppressed by DMTHB treatment. Western blot results showed that the ratio of Bcl-2/Bax and TH increased, but the level of α -synuclein ( α -syn) was remarkably reduced, which indicated that the apoptosis of dopaminergic neurons in mice was significantly reduced. The protein phosphorylation of p-PI3K, p-AKT and p-mTOR also increased about 2-fold, compared with the model group. Furthermore, qRT-PCR results demonstrated that the mRNA levels of pro-inflammatory cytokines, IL-1 β and TNF- α , were reduced, but the level of anti-inflammatory cytokine IL-10 increased after DMTHB treatment. Finally, the cellular assay displayed that DMTHB was also a strong antioxidant to protect neuron cell line PC12 by scavenging ROS. In this study, we demonstrated DMTHB alleviates the behavioral disorder and protects dopaminergic neurons through multiple-target effects includubg anti-apoptotic, anti-inflammatory and antioxidant effects.
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DOI
PubMed
高影响因子
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