Nano Research
·
2023
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IF 9.9
Dou Tong,Song Dian,Wang Yiping,Zhao Xuhui,Zhang Fazhi,Lei Xiaodong
Electrocatalytic CO 2 reduction reaction (ECO 2 RR) converts CO 2 to high-value chemical products and promotes the carbon cycle. Sulfur (S)-modified copper (Cu) and bismuth (Bi)-based catalysts have been recognized as promising catalysts for ECO 2 RR. Both of them are highly active for selective formate generation, however, their poor stability and severe competing hydrogen evolution reaction (HER) remain challenging. Herein, S-doped Cu coated with Bi (Bi/Cu-S) is developed to improve ECO 2 RR selectivity to formate. Bi/Cu-S/brass mesh (BM) electrode material for ECO 2 RR was prepared by electrodepositing Bi on the surface of Cu-S/BM nanowires obtained from CuS/BM after the electroreduction. The Faradaic efficiency (FE) of the formate reaches the maximum of 94.3% at −0.9 V vs. reversible hydrogen electrode (RHE) with a partial current density as high as −50.7 mAcm −2 and a yield of 30.7 mmolh −1 cm −2 under 0.5 M KHCO 3 electrolyte. Meanwhile, the FE of formate is higher than 90% in the voltage range of −0.8 to −1.0 V vs. RHE. It also shows good stability at −0.9 V vs. RHE with the FE of formate remaining above 93% after a 10 h reaction. Density functional theory (DFT) calculations demonstrate that the Bi/Cu-S structure promotes the adsorption of CO 2 and effectively inhibits HER by enhancing the adsorption of *H to a great extent, improving the selective conversion of CO 2 to formate. This work deepens the understanding of the mechanism of Cu-Bi-based catalysts and S-modified Cu-based catalysts in selective ECO 2 RR to formate, and also provides a new strategy for catalyst design.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
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IF 7.2
Ning Lv,Huitao Li,Jinjuan Dong,Xianrui Liu,Tianbao Li,Jujie Luo
Bi nanoflakes on Ni foam (NF) for supercapacitors (SCs) are prepared by simple one-step microwave irradiation without further calcination. XRD and XPS results reveal the successful synthesis of Bi crystal. SEM and EDS results uncover the growth of Bi and the constituent elements of the complexes. The Bi anode on NF (Bi/NF) not only enables an ultra-large specific capacity of 4651 F g −1 (1 A g −1 ) and a capacity maintenance rate of 75% (after 1000 cycles), but it also exhibits outstanding catalytic hydrogen precipitation reaction, reaching an overpotential of −136 mV versus the reversible hydrogen electrode at −10 mA cm −2 and Tafel slope of 114.4 mV dec −1 . The Bi anode is gathered into the asymmetric SC, which demonstrates an ultra-high energy density of 125 Wh kg −1 (power density of 640 W kg −1 ) in an alkaline electrolyte.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 38
·13732-13736
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IF 4
Ziyan Lv,Rukang Li
Much effort has been devoted to synthesizing nonlinear optical crystals with efficient second harmonic responses. Herein, a tantalum phosphate crystal Na11Ta8P7O43 with a moderate second harmonic response was obtained using self-fluxes of NaH2PO4 and Na2HPO4. Na11Ta8P7O43 belongs to the Cc space group of monoclinic systems with cell parameters of a = 8.5710(2) Å, b = 15.1144(4) Å, c = 28.7712(7) Å, β = 92.304(2)°, Z = 4. Its structural features were unique (Ta8O33) bi-capped triangular prisms uniformly oriented with a PO4 connection in the ab plane, which were further joined through additional PO4 groups in the c direction, resulting in moderate nonlinear effects. In addition, this crystal has the characteristics of phase-matchable second harmonic generation, a shorter cutoff edge than the known materials LiTaO3 and KTiOPO4, and high transmittance from the visible to the near infrared band, and may serve as a potential nonlinear optical crystal.
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PubMed
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CRYSTAL GROWTH & DESIGN
·
2023
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IF 3.8
Caiyun Liu,Huihui Niu,Dexin Wang,Yanshu Liu,Amir Said,Guo Wang,Chen-Ho Tung,Yifeng Wang
Selective oxidation utilizing sunlight and O2 is a cost-effective technique for converting organic raw materials into value-added products. We present a novel Bi-doped Ti-oxide cluster (TOC), Ti19Bi2, for the selective conversion of benzyl alcohols to benzaldehydes under sunlight irradiation. It is prepared as single crystals and precisely characterized by single-crystal X-ray diffraction. A structure–activity study is performed by combining experiments and density functional theory. Bi mainly contributes to the LUMO + 1 of Ti19Bi2, with a minor effect on the band gap energy. Bi doping causes the accumulation of photogenerated electrons at Bi sites, resulting in potent reducing power and high O2 activation ability, promoting charge separation and interfacial charge transfer. The Ti19Bi2 solar system showed good activity, selectivity, substrate scope, and catalyst recyclability in the selective oxidation of benzyl alcohols. It outperforms reference TOCs free of Bi, such as Ti8O8Bz16 (Bz = benzoate) and commercial TiO2 P25. Additionally, Ti19Bi2 is effective in photocatalytic CO2/epoxide cycloaddition and dye degradation reactions.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10537-10544
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IF 4
Guirong Huang,Qiushi Huang,Zhe Cui,Jinqi Zhu,Mengluan Gao,Wenqing Wang,Fuming Weng,Qian Liu,Rujia Zou
Bismuth (Bi) has emerged as a promising candidate for sodium-ion battery anodes because of its unique layered crystal structure, superior volumetric capacity, and high theoretical gravimetric capacity. However, the large volume expansion and severe aggregation of Bi during the alloying/dealloying reactions are extremely detrimental to cycling stability, which seriously hinders its practical application. To overcome these issues, we propose an effective synthesis of composite materials, encapsulating Bi nanoparticles in N,S co-doped carbon nanoribbons and composites with carbon nanotubes (N,S-C@Bi/CNT), using Bi2S3 nanobelts as templates. The uniform distribution of Bi nanoparticles and the structure of carbon nanoribbons can reduce the diffusion path of ions/electrons, efficiently buffer the large volume change and prevent Bi from aggregating during cycles. As expected, the N,S-C@Bi/CNT electrode shows superior sodium storage performance in half cells, including a high specific capacity (345.3 mA h g−1 at 1.0 A g−1), long cycling stability (1000 cycles), and superior rate capability (336.0 mA h g−1 at 10.0 A g−1).
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高影响因子
Materials Advances
·
2023
·Vol. 4
·期 10
·2365-2371
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IF 5
Shaofan Fang,Jinbo Huang,Huixia Li,Jingheng Nie,Zexiang Liu,Feier Fang,Haizhe Zhong
Luminescent metal halides doped with ns2-metal ions, such as 6s2-metal Bi3+, show excellent optoelectronic properties. However, the origin of the high photoluminescence quantum yield (PLQY) of Cs2SnCl6:Bi remains controversial and unclear. In this study, a series of Cs2SnCl6:Bi were synthesized by adopting different tin precursors of SnCl2/SnCl4. The samples from SnCl2 exhibited much higher PLQY than those from SnCl4, and the doping concentrations of Bi3+ had little effect on the high PLQY. When H3PO2 is added to the precursor of SnCl4 to reduce Sn4+ to Sn2+, the prepared Cs2SnCl6:Bi shows bright emission light and high PLQY. The high PLQY of Cs2SnCl6:Bi is attributed to the co-doping of Bi3+ and Sn2+. [SnCl4]2− and two VCl induce a large extra vibrational energy of the heavy localized excitons from [BiCl5]2− to enhance the efficiency of radiative recombination for high PLQY. This work deepens the understanding of the luminescence mechanism of Cs2SnCl6:Bi and supplies significant references for developing more perovskite materials with outstanding luminescence.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Fang Wei,Ting Luo,Yan Wang,Lichun Kong,JiuJu Feng,Zhengquan Li,Ji-Qing Lu,Fa Yang
A novel electrocatalyst for CO 2 -to-formate conversion at low overpotentials with abundant bimetallic interfaces aroused from Pd nanoparticles anchoring in the underlying Bi nanosheet (Pd-BiNS) was developed. This unique synthesis procedure undergoes a continuous reconstruction of Pd-BiOINS to Pd-Bi 2 O 2 CO 3 NS to Pd-BiNS, which was confirmed by in situ Raman spectra combined with quasi- in - situ electron microscopy. The optimized Pd 1 -BiNS exhibits a high Faradaic efficiency of 95 % for formate at only − 0.4 V versus reversible hydrogen electrode over 30 h electrolysis, breaking the limitation that metallic Pd-site is easily poisoned by the generated CO at low overpotentials. The in situ infrared spectroscopy indicates that Pd-BiNS has much suppressed *CO binding and enhanced *OCHO adsorption to inhibit the competing hydrogen evolution reaction by repelling surface water molecules, moreover, a systematic CO 2 RR mechanism with HCO 3 − participating as pre-proton donor for formate generation is unveiled. This work provides new insight into the multisite synergistic regulation at the atomic scale.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Qinghan Chen,Li Wang,Dehui He,Bo Xiao,Xia Ran,Rong Li,Hong Xu,Jian Feng
A novel [email protected] 5 O 7 I/Bi(OH) 3 (AB) heterojunction was prepared and the enhanced photocatalytic antibacterial activity against Escherichia coli ( E. coli ) under visible light excitation was exhibited. 3 %AB (containing 3 wt% of Ag) presented best photocatalytic performance, and all of E. coli cells were inactivated within 5 min under natural solar light irradiation. The photocatalytic antibacterial mechanism of AB heterojunction was corroborated by SEM, live/dead cell staining and SDS-PAGE assay. The destruction of the cell membrane, the leakage of the intracellular protein and the decomposition of the protein were considered as the events occurred in the antibacterial process. The radical capture experiment confirmed that •O 2 – and e – played the dominant role in the destruction of the cell membrane and the decomposition of the protein. The improvement of the photocatalytic activity can be mainly ascribe to the construction of heterojunction, SPR effect resulted from Ag deposition, enhanced visible light absorption and more surface oxygen vacancies. These factors are advantageous to the generation of the photogenerated electrons and holes, and improve the spatial separation efficiency of the photogenerated charge. This study presented a promising [email protected] 5 O 7 I/Bi(OH) 3 heterojunction as the photocatalyst for the potential application in the treatment of the bacterial contamination.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
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IF 24.319
Guanglan Di,Langlang Wang,Xuede Li,Xiaoli Zhao,Guangpeng Yang,Lei Huang,Zefang Chen,John Crittenden
Surface atomic arrangement and coordination of different crystal facets significantly affect the catalytic reactivity of photocatalysts. By modulating the solvent environment, we developed a one-step solvothermal route to synthesize a series of BiOBr nanosheets with different dominating facets ((001) and (010)) and simultaneously decorated metallic Bi and oxygen vacancies (OVs) on the identified preferred facets ((010)). The resulting Bi/OV-BiOBr-(010) outperform BiOBr-(010) with mono OVs, bare BiOBr-(010), and other well-known photocatalysts in both O 2 activation and pollutant degradation under both same catalyst loading and optical thickness conditions. The synergistic effects of the Bi-OV dual active sites in O 2 adsorption-activation and charge separation-transfer were confirmed by experimental characterization and DFT calculation. This study highlights the facet-dependent synergy of plasmonic metal-defect dual active sites and shed light on the rational design of photocatalysts for more efficient O 2 activation and refractory pollutant degradation.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Siman Wei,Yang You,Yiyuan Ma,Weiyan Huang,Xiaoying Liang,Anqiang Zhang,Yaling Lin
Treatment of chronic wounds, such as diabetic feet, pressure sores and skin ulcer, has been a difficult issue for wound dressings. It is of great interest but challenging to develop an ideal dressing for chronic wounds with long-term functionality, transparency for clinical observation and adaptability to skin deformation. In this work, we designed a supramolecular polydimethylsiloxane (PDMS) elastomer material with double layer structure. After a series characterizations including mechanical properties , adhesion properties, water-vapor permeability and bio-compatibility, this bi-layer film (BLF) is evaluated as a wound dressing in the wound healing model in both normal and diabetic rat. The results show that the BLF dressing has good bio-compatibility, similar moisture permeability and adhesion properties compared with a commercial medical Tegaderm™ film. Moreover, benefiting from the comparatively lower modulus, the BLF dressing provides more stable attachment to the skin and an enclosed moist healing environment for the wounds, which is found to promote the healing process in the early stage.
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SURFACE REVIEW AND LETTERS
·
2019
·
IF 0.748
XIANGRUI MENG,MEIFENG HAO,YIWEI JIANG,XIANGZHENYUE SUN,YAN WANG,YUQING MIAO
A simple wet-explosion method was employed to synthesize the Ni–Bi–P composite microspheres. The hollow structure was obtained possibly due to the violent evolution of gas bubbles when the reaction reagents were mixed. The hollow microspheres of Ni–Bi–P exhibited outstanding high catalytic activity for the reduction of p -nitrophenol ( p -NP) to form p -aminophenol in the presence of NaBH 4 within only 1 s. Due to the space limitation, the hollow structure of Ni–Bi–P microspheres helps to accommodate and confine the molecules of NaBH 4 and p -NP within the small space where NaBH 4 and p -NP contact closely at Ni–Bi–P catalysts. The synergetic action of Ni, Bi and P elements also contributes the enhanced catalytic activity.
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Kai Yu,Da Lei,Yajun Feng,Haochen Yu,Yue Chang,Yanbing Wang,Yaqi Liu,Gui-Chang Wang,Lan-Lan Lou,Shuangxi Liu,Wuzong Zhou
Investigation of Bi-doping effects on the catalytic performance of Pt/3DOM-Ce 1−x Bi x O 2−δ in the aerobic oxidation of 5-hydroxymethyl-2-furfural allows us to reveal the promoted catalytically active sites: the asymmetrical oxygen vacancies coordinated with one Bi and up to three Ce cations, such as Bi-□(-Ce) 3 , where □ represents an oxygen vacancy, which can easily gain oxygen atoms in favor of the CeO 2 structure, and, when filled with oxygen, easily release oxygen anions in favor of six-coordination for Bi 3+ . The loss of electrons in the reduction of oxygen atoms at these sites would be replenished by electron transfer from Pt nanoparticles , eventually promoting the oxidation potential of the Pt nanoparticles. The present work points out that the promoted catalytic properties in Bi-doped CeO 2 are mainly due to the asymmetric structures of the oxygen vacancies, rather than simply to the number of oxygen vacancies. The newly proposed model of asymmetrical active sites and electron transfer mechanism may shed light on the physicochemical properties of other solid solution substrate-supported metal nanoparticle catalysts.
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