APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Fang Liu,Weiyang Jin,Ying Li,Lekai Zheng,Yongchuan Hu,Xuewen Xu,Yanming Xue,Chengchun Tang,Hui Liu,Jun Zhang
The development of efficient non-precious metal catalysts to accelerate the oxygen evolution reaction (OER) kinetics is important for the development of water-derived hydrogen fuel. Iron-cobalt oxide ((Co, Fe) 3 O 4 ) is one of the most promising transition metal-based OER electrocatalysts under alkaline conditions, but its activity is unsatisfactory due to its limited active sites and poor electronic conductivity. Herein, self-supported (Co, Fe) 3 O 4 hierarchical nanosheet arrays with massive oxygen vacancies (denoted as V O -(Co, Fe) 3 O 4 /CC) are synthesized by a simple reduction method at room temperature. Oxygen vacancies can regulate the ratio of Co 2+ /Co 3+ , which leads to the modification of its electronic properties, and it also significantly improves the charge transfer ability and accelerates the reaction. Meanwhile, the unique hierarchical nanosheet arrays structure and abundant oxygen vacancies effectively adjust the number of OER active sites, which has a key role in developing a cost-effective oxygen electrode. Accordingly, V O -(Co, Fe) 3 O 4 /CC exhibits a relatively low overpotential of 286 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 .
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Zijun Sun,Guisong Fang,Jinglin Li,Jiahuan Mo,Xiong He,Xu Wang,Zhiqiang Yu
Hematite (α-Fe 2 O 3 ) is one of the promising photoanode materials for photoelectrochemical (PEC) water splitting, but its poor bulk charge transfer has been challenging towards its practical application. Herein, we have synthesized the (Ti, Zr) co-doped hematite by a facile hydrothermal method. The cooperation of (Ti, Zr) co-doped hematite yields photocurrent density of 1.51 mA cm −2 at 1.23 V vs. RHE and IPCE of 17.3% at 400 nm. The structural and PEC analysis indicate that the considerably PEC performance improvement is contributed to the higher carrier density and enhanced charge transfer of the synergistic effect of Ti and Zr co-doping.
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MATERIALS LETTERS
·
2020
·
IF 3.204
E. Loni,M.H. Siadati,A. Shokuhfar
In the current work, for the first time, hard-templating method was applied to synthesize mesoporous Na 2 CoP 2 O 7 powder for oxygen evolution reaction (OER) application. X-ray diffraction patterns (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analyses were carried out for investigating the structure, composition, and morphology of the electrocatalyst powder. The electrocatalytic performances of the mesoporous Na 2 CoP 2 O 7 (meso-Na 2 CoP 2 O 7 ) powder along with its composites with reduced graphene oxide (rGO) were studied by linear sweep voltammetry (LSV). The meso-Na 2 CoP 2 O 7 /rGO (50/50 wt%) composite required only 167 mV overpotential to produce a current density of 10 mA cm −2 .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Han Zhang,Zhaoming Luo,Yalun Liu,Yuwen Jiang
In this study, Ni 3 C nanoparticles (NPs) were loaded on LaNiO 3 NPs as a co-catalyst during the photocatalytic H 2 evolution. The evolution rate of the LaNiO 3 -3 wt%Ni 3 C composite (4093.9 μmol g −1 h −1 ) is about 5 times and 2 times as that of pristine LaNiO 3 NPs (819.2 μmol g −1 h −1 ), and 1 wt% Pt loaded LaNiO 3 NPs (1927 μmol g −1 h −1 ). The effects of co-catalyze with Ni 3 C on light absorption, electron-hole spatial separation, and surface H 2 -evolution kinetics are investigated. Loading with Ni 3 C can enhance the spatial separation of electron-hole pairs, and improve the H 2 -evolution kinetics. Further investigation shows that surface decomposition of LaNiO 3 NPs can only be observed when the Ni 3 C content is over 3 wt%, caused by the reductive carbon source needed in the loading process. This work indicates that transition metal carbide can be a promising co-catalyst candidate for oxides in photocatalytic applications without concerning corrosion from the reductive carbonaceous precursors in the loading process.
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SN Applied Sciences
·
2020
·Vol. 2
·期 3
·1-10
·
IF 0
Sun Xueying,Liu Xinjie,Wang Jie,Jiang Xusheng,Liu Rongmei,Li Anran,Li Wen
In this work, we first successfully loaded the MOF structure Co-HKUST nanobundles on a foamed nickel without adding any binder. The Co-HKUST is a pseudo-capacitive material with excellent electrochemical performance as a unique energy storage material. As an electro-active material, such cobalt-based MOF exhibits superior pseudo-capacitive behavior in the KOH aqueous electrolyte with a high specific capacitance of 578.6 F g −1 at 1 A g −1 , and the specific capacitance remains 452.3 F g −1 when the current density increased to 10 A g −1 with a good rate performance (78.2%). Meanwhile, the cycle retention rate of the Co-HKUST is 88.7% after 1000 cycles at 7.5 A g −1 . The two-electrode asymmetric supercapacitor (ASC) device is also assembled in this work. The specific capacitance of Co-HKUST//AC ASC is 200.5 F g −1 at 1 A g −1 . Though 5000 cycles at 5 A g −1 , only 8.2% of the capacitance is lost. Energy density of asymmetric Co-HKUST//AC device can reach 71.35 Wh kg −1 at 1 A g −1 with a power of 809.9 W kg −1 . More interestingly, even if the current density increased to 10 A g −1 , the energy density maintains 44 Wh kg −1 at power density of 8.5 kW kg −1 . The above test results can fully show that the synthesized Co-HKUST material is a promising energy storage material.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Li Zhong,Junyang Ding,Xian Wang,Lulu Chai,Ting-Ting Li,Kongzhao Su,Yue Hu,Jinjie Qian,Shaoming Huang
The rapid development of suitable and cheap water oxidation catalysts is of great significance in energy conversion and storage. In this context, herein we have synthesized two different types of metal–organic frameworks (MOFs, denoted as BMM-11 and BMM-12) constructed from the same metal salts (cobalt nitrate) and organic linkers (H4BPTC) at the similar solvothermal conditions. Interestingly, we learned that both crystalline materials can be conveniently converted into each other by a single-crystal-to-single-crystal transformation method at their corresponding synthetic conditions. Meanwhile, we applied them directly as electrocatalysts into OER application where the pure BMM-11 and BMM-12 can achieve a stable current density of 10 mA cm–2 with an overpotential of 0.362 and 0.393 V, respectively, during which MOF degradation unexpectedly occurs. After electrolysis, the following microscopic, spectroscopic, as well as electrochemical measurements confirm that these initial MOF precursors are rapidly transformed into the mixed phases of CoOxHy species consisting of CoOOH and Co(OH)2, which are essentially active components for OER performance. Finally, we have also considered other strategies to improve MOF-derived composites in oxygen evolution activity, including bimetallic doping and physical grinding strategy. The approach described here can further be extended to other cobalt-based MOFs-derived electrocatalysts for water splitting.
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PubMed
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Bioactive Materials
·
2020
·
IF 8.724
Yawei Ren,Yajing Han,Zhaoyang Li,Xiangmei Liu,Shengli Zhu,Yanqin Liang,Kelvin Wai Kwok Yeung,Shuilin Wu
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO 2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO 2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO 2 . Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO 2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO 2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO 2 .
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ChemNanoMat
·
2021
·Vol. 7
·期 12
·1322-1329
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IF 3.154
Jinglei Qin,Lanying Guo,Tingyu Yang,Xi Wu,Zhi Wang,Fang Xie,Hongshang Peng
Graphical A novel dopamine-modified epoxysilane was synthesized via a ring-opening reaction. Then, the photosensitizer ZnPc and photothermal-agent polydopamine were simultaneously introduced into nanoparticles by a facile encapsulation-reprecipitation method. The nanoparticles exhibited high photothermal conversion efficiency (η = 46.4%) and suitable photostability, apart from the capacity of 1 O 2 generation (Φ Δ =0.28). Based on the nanoparticles, improved therapeutic efficacy against tumor cells was achieved with synergetic treatment of PDT/PTT, even under hypoxia. A major obstacle to clinical photodynamic therapy (PDT) is tissue hypoxia in a solid tumor, which substantially reduces therapeutic efficacy by insufficient oxygen supply. To tackle this issue, herein, we reported a type of facilely prepared multifunctional nanoparticles (NPs) for combined treatment of PDT and photothermal therapy (PTT). A novel dopamine-modified epoxysilane (GSDA) was firstly synthesized from 3-glycidoxypropyl(trimethoxy) silane and dopamine via ring-opening reaction, which was subsequently incorporated into NPs along with zinc(II) phthalocyanine (ZnPc) via a reprecipitation-encapsulation method. Interestingly, polydopamine (PDA) was found to be automatically developed inside NPs by oxidative polymerization of dopamine monomers. Owing to strong-light-absorption PDA and ZnPc, the resultant biocompatible NPs exhibited high photothermal conversion efficiency (η=46.4%) and a decent singlet oxygen quantum yield (ΦΔ=0.28), respectively, under the irradiation of 808 nm and 660 nm light. Synergetic treatment was then performed on tumor cells using the multifunctional NPs, i. e., PDT followed by PTT, and enhanced phototherapeutic efficacy was achieved, particularly in the case of hypoxia. This work demonstrates that (i) the newly-synthesized GSDA might function as a bi-functional coupling agent for silica and PDA coating, and (ii) the simply-prepared NPs are very promising for synergetic PDT/PTT of solid tumors.
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Nano Research
·
2021
·Vol. 15
·期 3
·1973-1982
·
IF 8.897
Tan Xianjun,Ding Wenhui,Jiang Zhenying,Sun Linxiao,Huang Yuxiong
To better understand the mechanisms of hydrogen peroxide (H 2 O 2 )’s decomposition and reactive oxygen species (ROS)’s formation on the catalyst’s surface is always a critical issue for the environmental application of Fenton/Fenton-like reaction. We here report a new approach to activate H 2 O 2 in a co-catalytic Fenton system with oxygen incorporated MoS 2 , namely MoS 2− x O x nanosheets. The MoS 2− x O x nanosheets assisted co-catalytic Fenton system exhibited superior degradation activity of emerging antibiotic contaminants (e.g., sulfamethoxazole). Combining density functional theory (DFT) calculation and experimental investigation, we demonstrated that oxygen incorporation could improve the intrinsic conductivity of MoS 2− x O x nanosheets and accelerate surface/interfacial charge transfer, which further leads to the efficacious activation of H 2 O 2 . Moreover, by tuning the oxygen proportion in MoS 2− x O x nanosheets, we are able to modulate the generation of ROS and further direct the oriented-conversion of H 2 O 2 to surface-bounded superoxide radical (·O 2 surface − ). It sheds light on the generation and transformation of ROS in the engineered system (e.g., Fenton, Fenton-like reaction) for efficient degradation of persistent pollutants.
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Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Tingyan Lu,Qian Li,Jiawei Shao,Linlin Wang,Ruixue Pang,Xiaying Wu,Xin Hu
Backgrounds Adsorption by adsorbents is accepted as a promising technology that can efficiently separate CO 2 from flue gas. Optimal adsorption performance can be obtained by specific solid adsorbents with excellent CO 2 adsorption capacity. Methods In this work, N, S co-doped porous carbons were synthesized from polyacrylonitrile fiber by a facile synthesis process i.e. hydrothermal treatment followed by KOH activation. N, S enriched hydrochar was obtained after hydrothermal treatment of polyacrylonitrile fiber and ammonium sulfide. Further KOH activation of hydrochar obtained N, S co-doped carbons with advanced porous structure. Significant findings This series of sorbents has the highest CO 2 uptake of 3.37 and 5.23 mmol g −1 at 1 bar, 25 °C and 0 °C, respectively. Detailed investigation revealed that the mutual effects of narrow microporostiy, N and S content are responsible for the CO 2 uptake of these adsorbents. Additionally, these adsorbents also show various good CO 2 capture properties such as excellent recyclability, reasonable CO 2 /N 2 selectivity, moderate heat of adsorption, fast adsorption kinetics, and good dynamic adsorption capacity. These findings suggest that N, S co-doped porous carbons derived from polyacrylonitrile fiber are potential promising sorbents for CO 2 capture.
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ACS Omega
·
2021
·
IF 3.512
Mingyu Zhang,Chaoyong Wang,Junkai Zhang,Gang Li,Li Gu
LiNi0.8Co0.1Mn0.1O2 (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li+/Ni2+ intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li+/Ni2+ intermixing, suppressed phase transition, and decreased potential polarization and impedance.
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JOURNAL OF CONTROLLED RELEASE
·
2021
·
IF 9.776
Shengmei Wang,Xuanjun Liu,Shengfeng Wang,Linqi Ouyang,Hui Li,Jinsong Ding,Guiming Deng,Wenhu Zhou
Discovery of BCR-ABL1 tyrosine kinase inhibitors (TKIs) has revolutionized the therapy of chronic myeloid leukemia (CML), a malignant myeloproliferative disease characterized by abnormal activation of BCR-ABL fusion oncoprotein with protein tyrosine kinase (PTK) activity. However, the long-term treatment outcomes with TKIs are strongly limited by multiple drug resistances, resulting in relapse albeit with initial high response rate. Here, we reported a realgar (As 4 S 4 ) nanocrystal-based delivery system to reverse drug resistance for synergistic CML therapy. While As 4 S 4 is extremely insoluble in water, bovine serum albumin (BSA) was rationally screened to effectively stabilize As 4 S 4 nanocrystal with uniformed size of ~40 nm. Imatinib (IMA), a representative TKIs, can be readily loaded into the hydrophobic domain of BSA to develop As 4 S 4 /IMA co-delivery system. Mechanistically, IMA inhibits PTK activity, while As 4 S 4 degrades BCR-ABL1, which co-contribute to tumor suppression via complementary pathways for synergistic effect. Moreover, the nanosystem was modified with folic acid (FA) to enable tumor targetability, which has been demonstrated both in vitro and in vivo, resulting in robust tumor growth inhibition and significantly prolonged mice survival without any noticeable adverse effects. This work designed a synergistic nanoplatform for targeted CML therapy, provided a strategy to address the key limitation of As 4 S 4 for biomedical applications, and highlighted the advantages of the combination between traditional Chinese and western medicine for diseases treatment.
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