INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Shengxiong Liao,Zhijie Zhang,Yuying Li,Yuying Zheng,Dai Dang
The development of efficient and stable non-precious bifunctional electrocatalysts is of great significance, but it remains a great challenge. Herein, we have constructed Co/CoP@NC heterojunction catalyst loaded with Co and CoP particles on a nitrogen-doped carbon (NC) substrate using the pyrolysis-oxidation-phosphating strategy. The synergistic effect of Co and CoP particles on the NC substrate increases the active specific surface area, accelerates the charge transfer rate, and improves the intrinsic activities of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The Co/CoP@NC catalyst exhibits superior HER and OER performance. Specifically, the overpotentials required for Co/CoP@NC to reach the current density of 10 mA cm −2 are 142 and 186 mV for HER and OER, respectively. This study provides new insights into the design and synthesis of efficient and stable Co-based heterostructure catalysts.
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高影响因子
Advanced Science
·
2025
·
IF 14.1
Fengyi Zhong,Jianping Sheng,Chenyu Du,Ye He,Fengying Zhang,Yanjuan Sun,Ying Zhou,Fan Dong
Heterojunctions, known for their decent separation of photo-generated electrons and holes, are promising for photocatalytic CO 2 reduction. However, a significant obstacle in traditional post-assembled heterojunctions is the high interfacial barrier for charge transfer caused by atomic lattice mismatch at multiphase interfaces. Here, as research prototypes, the study creates a lattice-matched co-atomic interface within CsPbBr 3 -CsPb 2 Br 5 polytypic nanocrystals (113-125 PNs) through the proposed in situ hybrid strategy to elucidate the underlying charge transfer mechanism within this unique interface. Compared to CsPbBr 3 nanocrystals, the 113–125 PNs exhibit a remarkable 3.6-fold increase in photocatalytic CO 2 reduction activity (173.3 µmol −1 g −1 within 5 h). Furthermore, Kelvin probe force microscopy results reveal an increase in the built-in electric field within this lattice-matched co-atomic interface from 43.5 to 68.7 mV, providing a stronger driving force for charge separation and directional migration. Additionally, ultrafast transient absorption spectroscopy uncovers the additional charge carrier transfer pathways across this lattice-matched co-atomic interface. Thus, this unique co-atomic interface significantly promotes the interfacial electronic coupling and mitigates the charge transfer barrier, thus facilitating efficient charge separation and transfer. These insights underscore the importance of interfacial structure in heterojunction design and comprehending the intricate interplay between interface and carrier dynamics.
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PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-13
·
IF 10.6
Zhang Lifeng,Luo Shihua,Li Wenbin,Su Wanting,Chen Siting,Liu Chunchen,Pan Weilun,Situ Bo,Zheng Lei,Li Ling,Yan Xiaohui,Zhang Ye
Rapid and sensitive nucleic acid detection is vital in disease diagnosis and therapeutic assessment. Herein, we propose a co-freezing localized CRISPR-Cas12a (CL-Cas12a) strategy for sensitive nucleic acid detection. The CL-Cas12a was obtained through a 15-minute co-freezing process, allowing the Cas12a/crRNA complex and hairpin reporter confined on the AuNPs surface with high load efficiency, for rapid sensing of nucleic acid with superior performance to other localized Cas12a strategies. This CL-Cas12a based platform could quantitatively detect targets down to 98 aM in 30 min with excellent specificity. Furthermore, the CL-Cas12a successful applied to detect human papillomavirus infection and human lung cancer-associated single-nucleotide mutations. We also achieved powerful signal amplification for imaging Survivin mRNA in living cells. These findings highlight the potential of CL-Cas12a as an effective tool for nucleic acid diagnostics and disease monitoring.Graphical abstract
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PubMed
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Molecular Catalysis
·
2025
·
IF 4.9
Ying Yang,Shuo Wang,Yuhang Sun,Jihuan Song,Chenmeng Cui,Sungsik Lee
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) is significant for producing chemicals and fuels from renewable resources, a promising direction in biomass refining. Currently, non-precious metal catalysts suffer from low activity due to a single electronic structure, which is incapable of effectively activating both C O in LA and H 2 . Herein we report in situ fabricated Co nanoclusters within positive and metallic Co sites on N-doped carbon, which can simultaneously activate LA's C O and H 2 , enhancing the activity and selectivity for GVL production. Urea-assisted Co dispersion coupled with variation of pyrolysis temperature, Co nanoclusters were formed via direct conversion of Co-containing zinc trimesic acid fibers. The resulting Co nanoclusters possess dual active sites of Co-N x and metallic Co, with adjustable electronic structures. Under the reaction conditions of 200 °C and 4.5 MPa H 2 for 4 h, LA was completely converted, achieving 95 % yield of GVL. The outstanding catalytic activity is attributed to the Co-N x and metallic Co active sites, which facilitate the activation of C O and H 2 , respectively. This research provides a new concept for converting N-free metal-organic frameworks into non-precious metal nanoclusters, offering valuable insights for designing high-performance non-precious metal catalysts for biomass-derived chemical and fuel production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Li-Hong Xin,Li Luo,Tian Gan,Xian-He Liu,Ze-Da Meng,Meng-Jiao Zhu,Shou-Qing Liu
In this study, we investigate the performance of cobalt-iron co-doped phosphomolybdate (CoFe–PMo) as an efficient electrocatalyst for oxygen evolution reaction (OER) in acidic electrolyte. We demonstrate that the introduction of cobalt and iron ions into the phosphomolybdate structure enhances its catalytic activity towards OER. The electrochemical measurements reveal that CoFe–PMo exhibits remarkable stability and improved catalytic activity compared to the undoped amminium phosphomolybdate. The overpotential for OER is only 223 mV at 10 mA cm −2 , which is even smaller than that of IrO 2 .The durable tests maintain its performance over 40 h electrolysis period that the current barely drops. This enhanced performance is attributed to the internal redox between doped cobalt-iron ions and Mo ions in PMo, which promotes the charge transfer and enhances the active sites for OER. The results suggest that CoFe–PMo is a promising catalyst for efficient water splitting in acidic electrolyte, highlighting the potential of cobalt-iron co-doped ammonium phosphomolybdate as a cost-effective and durable electrocatalyst for water splitting for H 2 energy in acidic electrolytes.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2025
·
IF 4.1
Qingyun Li,Shaohui Yan,Zhengfeng Jiang,Liang Xian,Jianjia Du,Haibo Liu,Youyan Liu
Cyanide and phenol are highly toxic chemicals that exert severe inhibitory effects on microorganisms, posing significant challenges for their removal by biological methods in coexistent systems. In this study, we successfully isolated a bacterial strain named JF101, identified as Alcaligenes faecalis , which was capable of degrading both cyanide and phenol. The interactions between cyanide and phenol during biodegradation were investigated. It was found that the presence of 100 mg/L cyanide significantly enhanced the degradation of phenol, leading to the complete degradation of 1000 mg/L phenol within 86 h. In contrast, only 21.9% of phenol was degraded in the absence of cyanide. Additionally, the presence of phenol had minimal impact on cyanide degradation; a concentration of 100 mg/L cyanide could be rapidly and completely degraded within 40 min even in the presence of up to 1000 mg/L phenol. Five empirical kinetic models of Haldane, Aiba, Edward, Yano, and Webb were employed to describe the degradation processes of phenol and cyanide in both single-substrate and dual-substrate systems. The putative degrading enzymes, degradation products, and pathways associated with the co-degradation of cyanide and phenol were systematically analyzed. The formamide and NH 4 + -N produced from the rapid degradation of cyanide served as nitrogen sources, facilitating the resumed growth of strain JF101 and enhancing phenol degradation.
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BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2015
·Vol. 63
·期 2
·214-219
·
IF 1.362
Xiao Zhou,Yan Liu,Qipeng Yuan,Hao Liang
A novel multi-enzyme co-immobilized nanoparticle was prepared by the bis-aryl hydrazone conjugation strategy for enhancing the overall reaction efficiency and specificity. It can be seen that the molar substitution ratios of succinimidyl 6-hydrazinonicotinamid acetone hydrazone or succinimidyl 4-formylbenzoate to glucose oxidase (GOX) or horseradish peroxidase (HRP) increased with the concentration of the linking reagents. The amount of the immobilized conjugates on the support was measured to be 22.8 ± 1.6 mg/g-particle, and it meant that more than 90% of the GOX–HRP conjugates were successfully attached onto the polystyrene (PS) nanoparticles. Moreover, the immobilized bi-enzymes conjugate on the PS nanoparticles increased about 1.6-fold compared with that of free enzymes.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Ting Pan,Chuang Chen,Li Yu,Cong Yin,Mi Zhou,Huidong Qiu,Guoyuan Yuan,Wei Xiong,Xiaoqin Pu
In addressing the crucial need for separating cobalt ions from leachate solutions of spent ternary lithium batteries (TLBs), this study focuses on the development of an innovative molecular sieve (MS)-based MOFs material, MS-MIL-53(Al), synthesized by combining MS with 2,5-dihydroxyterephthalic acid. Since the powdered MS-MIL-53(Al) material presents a granular powdery form, which is difficult to recover during the adsorption process, electrospun nanofibers denoted as MS-MIL-53(Al)/PAN, were fabricated and functionalized with hydroxylamine hydrochloride to create MS-MIL-53(Al)/AOPAN. Static adsorption experiments conducted with MS-MIL-53(AL)/AOPAN as the adsorbent in cobalt-containing wastewater revealed a maximum adsorption content of 65.3 mg/g for Co(II). Moreover, the material exhibited a tensile strength at the breaking point of 0.077 kPa, indicating its excellent mechanical properties. The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm model, showcasing a spontaneous, endothermic monolayer chemical adsorption behavior. XPS analysis highlighted the influence of hydroxy and amidoxime functional groups on Co(II) adsorption. Notably, MS-MIL-53(Al)/AOPAN displayed exceptional stability, retaining over 90 % of its adsorption capacity after five cycles, demonstrating its potential for efficient Co(II) separation in wastewater treatment. This study is the first to synthesize MOFs material using MS as the base material, showing potential cost reduction and enhanced adsorption capabilities, with implications for advancing the innovative use of MOFs.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Beibei Yu,Wenqin Wu,Jiayi Jin,Huimin Wu,Shengfu Wang,Qinghua Xia
Co-based selenides with different selenium contents were successfully synthesized by a one-pot solvothermal method . The physical properties of the prepared catalysts were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis . While their electrocatalytic performances were evaluated by cyclic voltammetry , linear sweep voltammetry , electrochemical impedance spectroscopy and chronoamperometry . The results showed that the Co-Se-75 displayed better electrocatalytic activity towards the oxygen reduction reaction with higher onset potential (0.708 V vs. RHE), reduction current (2.81 mA cm −2 ) and a four-electron oxygen reduction process. Furthermore, the catalyst exhibited better stability, stronger resistance to methanol, ethanol and ethlene glycol than that of the Pt/C (20 wt% Pt) catalyst.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2016
·Vol. 47
·期 3
·361-367
·
IF 2.223
Xiao Mingshu,Zhang Zhonghui,Tian Yanping,Miao Yuqing,Wang Jiahai
Abstract In this work, the synthesis of Co–Fe–Se ultrathin nanosheet-fabricated microspheres was reported for the first time as electrocatalysts toward hydrogen evolution reaction (HER). The Co–Fe–Se ternary compounds exhibited high electrocatalytic activity of HER with low onset potential in acid media due to the high specific surface area of Co–Fe–Se ultrathin nanosheet-fabricated microspheres. The presence of multiwall carbon nanotubes improved the immobilization effect of Co–Fe–Se catalysts and electron transfer between catalysts and electrode surface, leading to the improved stability and HER electrocatalysis. The non-noble metal-based ternary compounds of Co–Fe–Se obtained from earth-abundant elements may enlighten a new way of exploring cost-effective catalysts for HER to develop hydrogen energy. Graphical Abstract
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 19
·3498-3505
·
IF 3.849
Jian-Rong Wang,Xiaojuan Wang,Yong Yang,Xiaoyan Chen,Xuefeng Mei
17β-estradiol (E2) is a steroid hormone with low oral bioavailability due to its low aqueous solubility (0.2–5 μg mL−1). To improve its solubility and thus bioavailability, two co-crystals of E2 with isonicotinamide (INA) (1) and piperazine (PIP) (2) were successfully designed and synthesized and their structures were successfully determined. In vivo PK studies revealed that 1 possesses improved bioavailability in an animal model.
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高影响因子
Nano Energy
·
2016
·
IF 11.553
Qingping Wu,Feng Huang,Mingshi Zhao,Ju Xu,Jiangcong Zhou,Yuansheng Wang
Blue TiO 2 (Ti 3+ defected TiO 2 ) nanoparticles have been intensively investigated for photocatalytic H 2 production. However, the Ti 3+ , with energy level ~1.0 eV below the conduction band , cannot initiate visible light driven H 2 production. Thus, Pt or NiO x is often used as a co-catalyst, which is economically unattractive and environmentally contaminative. In this paper, the ultra-small yellow TiO 2 nanoparticles (~3 nm) have been firstly synthesized without introducing any external dopants . The titanium vacancies (acceptor) and titanium interstitials (donor) that incorporated in the yellow TiO 2 are evidenced by various characterization techniques, and their formation mechanism is proposed. Photocatalytic evaluations indicate that the acceptor–donor defects play key roles in the catalytic process, not only initiating, but also promoting the visible light driven H 2 production. The improved activity is also evidenced by that the simulated solar light driven H 2 production for the yellow TiO 2 is ~3.7 fold comparing to that of the normal TiO 2 . A reasonable explanation is that the acceptor-donor defect associates form internal polarization for spontaneously separating photo-generated charge-carriers. The improved charge-carrier separation has been confirmed by photoluminescence spectra and photoluminescence emission decay profiles. Instead of the traditional TiO 2 based photocatalysts , the acceptor–donor defect engineered photocatalyst system offers a new approach for simultaneously initiating and promoting visible light driven co-catalyst free H 2 production.
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