Nanomaterials
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2023
·Vol. 13
·期 11
·1767
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IF 5.3
Wenqin Lai,Yating Liu,Mingming Zeng,Dongmei Han,Min Xiao,Shuanjin Wang,Shan Ren,Yuezhong Meng
The rapid development of electrochemical CO2reduction offers a promising route to convert intermittent renewable energy into products of high value-added fuels or chemical feedstocks. However, low faradaic efficiency, low current density, and a narrow potential range still limit the large-scale application of CO2RR electrocatalysts. Herein, monolith 3D bi-continuous nanoporous bismuth (np-Bi) electrodes are fabricated via a simple one-step electrochemical dealloying strategy from Pb-Bi binary alloy. The unique bi-continuous porous structure ensures highly effective charge transfer; meanwhile, the controllable millimeter-sized geometric porous structure enables easy catalyst adjustment to expose highly suitable surface curvatures with abundant reactive sites. This results in a high selectivity of 92.6% and superior potential window (400 mV, selectivity > 88%) for the electrochemical reduction of carbon dioxide to formate. Our scalable strategy provides a feasible pathway for mass-producing high-performance and versatile CO2electrocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jiaying Yan,Yayu Guan,Barbara Marchetti,Yuyu Liu,Fanghua Ning,Jin Yi,Xiao-Dong Zhou
Electrochemical reduction of CO 2 (ERCO 2 ) is an effective way to convert CO 2 into useful chemical products. However, most catalysts used for ERCO 2 show poor selectivity and stability. Here, we design a Bi 8 Eu 1 bimetallic catalyst, which exhibits both excellent stability (>400 h) and Faradaic efficiency for formate production (∼100% at − 0.89 V RHE ). Moreover, high Faradaic efficiency (>97%) is observed over a wide potential window (from − 0.89 V RHE to − 1.19 V RHE ). In a flow-cell, the Bi 8 Eu 1 catalyst shows an ultra-high current density of 250 mA cm −2 at − 0.77 V RHE . Density functional theory calculations indicate that the Bi-Eu interactions activate the Bi sites for strongly stabilizing *OCHO intermediates, thus promoting the conversion of CO 2 to formate. This work provides insights into the design of excellent electrocatalysts for ERCO 2 with improved activity and durability.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 27
·2215109
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IF 19
Yanran Zhu,Qian Chen,Yue Zhou,Xingya Li,Liang Ge,Tongwen Xu
Acid recycling via cation exchange membranes (CEMs) has attracted considerable attention from traditional industries and advanced manufacturing because of the economic and environmental advantages. However, current polymeric CEMs merely have constant ion channels by the fixed groups in the matrix and lack the synergy of bi-functional sites. Herein, a series of dibenzo-18-crown-6 (DB18C6) functionalized sulfonated poly(biphenyl alkylene) membranes is reported. The resultant membranes form phase separation and ordered ion channels by the electrostatic interaction between DB18C6-H + complexes and the SO 3 − anionic sites, constructing a low-swelling synergistic hydrophilic network. The prepared membranes have high proton permeation rates of 2.98-4.85 mol m −2 h -1 and extremely low ferrous ion permeabilities, leading to a high H + /Fe 2+ selectivity of ≈3153 at the current density of 10 mA cm -2 , which is one order of magnitude higher than the commercial and previously reported membranes via the electrodialysis. These results provide strategies for designing bi-functional ion exchange membranes for selective ion transport via utilizing crown ether/cation complexes.
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Journal of Materials Chemistry A
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2023
·Vol. 11
·期 20
·10857-10866
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IF 11.9
Qiang Peng,Meng Ma,Qindan Chu,Hao Lin,Wenting Tao,Wenqin Shao,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
With the rapid development of electronic equipment and communication technology, it is urgent to develop composites with absorption-dominated and high electromagnetic interference shielding effectiveness (EMI SE) to prevent secondary pollution of electromagnetic (EM) waves. Herein, an effective strategy is employed to fabricate porous Ni-coated melamine foam (Ni@MF)/multi-walled carbon nanotubes (CNT)/temperature-sensitive microspheres (TSM)/polydimethylsiloxane (PDMS) composite foams with an absorption-dominated EMI shielding mechanism and high EMI SE at low filler loading. The bi-conductive network, including a high-efficiency Ni@MF sponge obtained by electroless plating and ordered arrangement and distribution of CNTs induced by the volume exclusion effect, endows the Ni@MF/CNT/TSM/PDMS composite foam with an extremely high conductivity of 2799.8 S m−1 and excellent EMI SE of 45.3 dB with a low CNT loading of 3.0 wt%. The absorption coefficient (A) exceeding 0.72 indicates the absorption-dominated EMI shielding mechanism due to weakened impedance matching and diversiform dissipation mechanisms. What's more, the hydrophobicity, excellent mechanical properties, stable pH resistance and outstanding EMI shielding durability promote the composite foams to maintain impressive performance even in complex and harsh environments. This work establishes an efficient strategy for the absorption-dominated EMI shielding composite foams with a porous structure and bi-conductive network structure, which reveals prospective applications in intelligent electronic equipment and next-generation communication technologies.
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CHEMOSPHERE
·
2023
·
IF 8.8
Litao Jia,Chenjia Yang,Xiaoyong Jin,Dan Wang,Fanghua Li
A hot research topic in visible-light-driven photoelectrocatalytic (PEC) oxidation technology is the development of superior photoanode materials. The design of the photoanode system with a direct Z-scheme charge transfer mechanism is crucial to achieving effective charge separation for sustainable photoelectrocatalysis. Here, a novel Bi / Bi 2 S 3 /α-MoO 3 heterostructure was successfully assembled by a simple and feasible strategy. The direct Z-scheme heterogeneous formed between Bi 2 S 3 and α-MoO 3 has the advantages of low resistance, high optical response current and the surface plasmon resonance (SPR) effect of Bi nanoparticles (Bi NPs). Thus, the efficiency of photogenerated carrier separation and transfer is further enhanced, and the catalytic activity is significantly improved. It is impressive that the unique photoanode has achieved a maximum removal efficiency of 85.8% of tetracycline (TC) pollutants under visible light irradiation within 60 min and has excellent stability, which is expected to degrade antibiotics efficiently and environmentally in harsh environments. These characteristics give Bi / Bi 2 S 3 /α-MoO 3 promising candidates for practical applications in antibiotic degradation.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 6
·1240-1261
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IF 7
Po Zhang,Jialin Chen,Yuzhi Sun,Zhicheng Cao,Yanan Zhang,Qingyun Mo,Qingqiang Yao,Wei Zhang
Osteochondral defect (OCD) regeneration remains a great challenge. Recently, multilayer scaffold simulating native osteochondral structures have aroused broad interest in osteochondral tissue engineering. Here, we developed a 3D multifunctional bi-layer scaffold composed of a kartogenin (KGN)-loaded GelMA hydrogel (GelMA/KGN) as an upper layer mimicking a cartilage-specific extracellular matrix and a hydroxyapatite (HA)-coated 3D printed polycaprolactone porous scaffold (PCL/HA) as a lower layer simulating subchondral bone. The bi-layer scaffolds were subsequently modified with tannic acid (TA) prime-coating and E7 peptide conjugation (PCL/HA-GelMA/KGN@TA/E7) to regulate endogenous stem cell behaviors and exert antioxidant activity for enhanced osteochondral regeneration. In vitro, the scaffolds could support cell attachment and proliferation, and enhance the chondrogenic and osteogenic differentiation capacity of bone marrow-derived mesenchymal stem cells (BMSCs) in a specific layer. Besides, the incorporation of TA/E7 significantly increased the biological activity of the bi-layer scaffolds including the pro-migratory effect, antioxidant activity, and the maintenance of cell viability against oxidative stress. In vivo, the developed bi-layer scaffolds enhanced the simultaneous regeneration of cartilage and subchondral bone when implanted into a rabbit OCD model through macroscopic, micro-CT, and histological evaluation. Taken together, these investigations demonstrated that the 3D multifunctional bi-layer scaffolds could provide a suitable microenvironment for endogenous stem cells, and promote in situ osteochondral regeneration, showing great potential for the clinical treatment of OCD.
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ACS Applied Materials & Interfaces
·
2018
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IF 8.097
Shuang Zhao,Rongrong Tian,Baiqi Shao,Yang Feng,Senwen Yuan,Langping Dong,Liang Zhang,Kai Liu,Zhenxin Wang,Hongpeng You
Herein, a novel multifunctional nanoplatform was designed toward multimodality imaging and photothermal therapy (PTT). It was found that Bi nanoparticles could grow in situ on the surface of NaYF4:20%Yb,2%Er@NaYF4:40%Yb@NaGdF4 core–shell nanoparticles (labeled as UCNPs). In this structure, UCNPs were mainly employed as an upconversion luminescence (UCL) imaging agent, whereas the Bi nanoparticles worked as an effective CT imaging and photothermal agent. Importantly, a dense SiO2 shell was employed to protect the Bi nanoparticles from oxidation, and it also endowed the nanoplatform with excellent hydrophilic ability. The effective UCL/CT imaging and PTT performances were emphasized by a series of in vivo experiments, which suggest that the integrated nanoplatform with imaging and therapy functions shows great promise in the biomedical field.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jun Pan,Kang Yu,Hongzhi Mao,Lili Li,Yuchen Zhang,Yanlu Li,Paulo J. Ferreira,Jian Yang
A simple synthesis has been developed for watermelon-like nanocomposites with Ti-based oxides as the matrix. Using the case of Sb nanocrystals in amorphous TiPO x as an example, in-situ/ex-situ techniques, first-principle calculations and control experiments confirm that the formation of Ti-based oxides promotes the reduction of Sb 3+ to Sb by NH 3 at an elevated temperature. A similar synthesis process also succeeds for Sb nanocrystals in amorphous TiO 2 and for Bi nanocrystals in amorphous TiPO x , confirming the promising potential of this synthesis. More importantly, the nanocomposite composed by crystalline Sb in an amorphous TiPO x matrix, as the anode material for sodium storage, concurrently exhibits a long cycle life (~1000 cycles) and a high capacity retention (~82%), suggesting the advantages of watermelon-like structures.
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NANO LETTERS
·
2019
·
IF 12.279
Xiaolei Yuan,Yong Zhang,Muhan Cao,Tong Zhou,Xiaojing Jiang,Jinxing Chen,Fenglei Lyu,Yong Xu,Jun Luo,Qiao Zhang,Yadong Yin
Developing high-performance electrocatalysts for the ethanol oxidation reaction (EOR) is critical to the commercialization of direct ethanol fuel cells. However, current EOR catalysts suffer from high cost, low activity, and poor durability. Here we report the preparation of PdBi-Bi(OH)3 composite nanochains with outstanding EOR activity and durability. The incorporation of Bi can tune the electronic structure and downshift the d-band center of Pd while the surface decoration of Bi(OH)3 can facilitate the oxidative removal of CO and other carbonaceous intermediates. As a result, the nanochains manifest an exceptional mass activity (5.30 A mgPd–1, 4.6-fold higher than that of commercial Pd/C) and outstanding durability (with a retained current density of ∼1.00 A mgPd–1 after operating for 20 000 s). More importantly, the nanochain catalyst can be reactivated, and negligible activity loss has been observed after operating for 200 000 s with periodic reactivation, making it one of the best EOR catalysts.
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Min Hong,Chao Zhou,Shusheng Xu,Xianzhu Ye,Zhi Yang,Liying Zhang,Zhihua Zhou,Nantao Hu,Yafei Zhang
Metal organic frameworks are regarded as promising electrode material for supercapacitors , however, low conductivity and pulverization hinder their application as free-standing film electrodes for high-performance supercapacitors . Herein, we demonstrate a core-sheath structured film electrode based on bi-metal organic framework nanosheets assembled on Ni wire for energy-dense supercapacitors. Dual metal-based vertically oriented metal organic frameworks nanosheets assembled on Ni wires can offer high surface areas, structure stability, as well as high conductivity, capacity, and rate capability. The as-fabricated Ni@CoNi-MOF film electrode delivers a specific capacity of 813C cm −3 at 0.5 A cm −3 and a high rate performance of 325C cm −3 at 5 A cm −3 . Moreover, the assembled hybrid supercapacitor based on Ni@CoNi-MOF film (positive electrode) and graphene/carbon nanotube hybrid film (negative electrode) exhibits a high volumetric capacitance of 100 F cm −3 at 0.5 A cm −3 and an high energy density of 31.3 mWh cm −3 with the power density of 3769.4 mW cm −3 . Remarkably, capacitance of as-assembled hybrid supercapacitor device retains 100% after 10000 cycles at 3 A cm −3 , indicating a long cycling stability. The concept design of this work can give an insight for engineering metal organic frameworks based or other similar electrode materials for volumetric-energy dense supercapacitors.
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Junbin Liao,Xinyan Yu,Nengxiu Pan,Jun Li,Jiangnan Shen,Congjie Gao
Fabricating stable mono-/multi-valent anion-selective membranes with high perm-selectivity for electrodialysis (ED) applications is critical but challengeable. In this work, we have fabricated a series of novel homogeneous monovalent anion-selective amphoteric ion-exchange membranes (AIEMs, PAES-im-Xc) based on a long-side-chain type imidazolium-functionalized poly(arylene ether sulfone) cross-linked with 4,4′-diazostilbene-2,2′-disulfonic acid disodium salt (DAS) for ED. By tuning the mass percent of DAS added, low swelling ratio but appreciably high anion perm-selectivity (in Cl – /SO 4 2– system) of optimized AIEM are achieved to values of 8.0% and 47.12 at current density of 2.5 mA cm –2 , respectively. In particular, at an enhanced current density of 5.0 mA cm –2 , its perm-selectivity reaches 12.5, significantly outperforming commercial monovalent anion-selective Neosepta ACS (5.27). The appreciably high perm-selectivity possibly arises from pore-size sieving effect from dense matrix structure with cross-linkings and strong electrostatic repulsion between negative fixed –SO 3 – groups and negative divalent ions of SO 4 2– in feeding solution. The superior performances might be particularly interesting findings that can facilitate the development of advanced mono-/bi-valent anion-selective membranes in applications of sea water desalination, resource recovery and water treatment/pretreatment etc..
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Hui Zhou,Songtao Zhong,Ming Shen,Jianhua Hou,Wuxia Chen
Herein, we fabricate a Bi/Bi 2 O 2 CO 3 heterojunction via one-pot in situ deposition of Bi nanoparticles on Bi 2 O 2 CO 3 nanosheets , using formamide both as a carbon/alkali source and a reductant and demonstrate that the content of Bi in Bi/Bi 2 O 2 CO 3 composites can be tuned by adjusting the hydrothermal reaction time. Systematic characterization and analysis of as-prepared composites revealed that the initial in situ growth of Bi nanoparticles on BiOCOOH (an intermediate formed during the decomposition of formamide) was followed by the reaction of BiOCOOH with CO 3 2− to afford Bi 2 O 2 CO 3 nanosheets. The photocatalytic activity (PCA) of Bi/Bi 2 O 2 CO 3 was evaluated by degradation of rhodamine B (RhB) under simulated solar light irradiation, and the best result (99.61% degradation efficiency after 50-min irradiation) was observed for the photocatalyst obtained after 12-h hydrothermal treatment. The enhanced photocatalytic performance was ascribed to visible-light harvesting and electron-hole separation efficiency improvements caused by the surface plasmon resonance of Bi nanoparticles. Moreover, the developed photocatalyst displayed high photochemical stability and reusability during ten photocatalytic cycling runs and was therefore concluded to be well suited for practical wastewater purification applications. Thus, this work provides a new and facile method of utilizing non-noble Bi nanoparticles to optimize the PCA of semiconductor materials.
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