International Journal of Electrochemical Science
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2023
·
IF 1.5
Fengping Liu,Wei Huang,Zhenfa Zhang,Cuizhong Zhang,Qing Huang,Gang Xiang,Meiyan Liang,Jinyun Peng
In this work, a novel electrochemical sensor based on sulfur and nitrogen co-doped porous graphene (SNPG) is developed for the simultaneous detection of Cd 2+ and Pb 2+ by in situ plating bismuth film. The large effective surface area and doped sulfur and nitrogen in porous graphene supply active sites with high affinity toward Cd 2+ and Pb 2+ by electrostatic interaction to improve the sensor performance, and the bismuth film improves the stripping voltammetric performance by forming bismuth-metal (Cd, Pb) alloys. Under optimized conditions, this sensor exhibits linearity in the range of 0.05-2 μM for Cd 2+ and Pb 2+ with a low detection limit of 0.02 μM for Cd 2+ and 0.008 μM for Pb 2+ . Moreover, the proposed sensor was applied for the simultaneous detection of Cd 2+ and Pb 2+ in tap water with satisfactory results, suggesting that SNPG is a promising electrode material for detecting heavy metal ions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Sundaram Chandrasekaran,Tingting Ma,Zhichang Hu,Qianying Liu,Chao Zhan,Yan Li,Chris Bowen,Huidan Lu,Yongping Liu
Chevrel-phase metal sulfides are known to be promising materials for energy conversion and storage applications. However, a detailed understanding of the intrinsic kinetic mechanisms of electrocatalytic bifunctional hydrogen and oxygen evolution reactions (HER/OER) on NiMo 3 S 4 -based Chevrel-phases is lacking. Herein, novel ultrathin self-assembled nanosheets of NiMo 3 S 4 are coupled with transition metal atoms (M/N-NiMo 3 S 4 ; where M = Co, Fe, and Cu) were formed by a facile hydrothermal approach. Notably, the Co/N-NiMo 3 S 4 electrocatalyst exhibits excellent performance in terms of ultralow overpotentials of 78, 208, 282, and 307 mV at 10, 100, 500, and 1000 mA cm −2 for the HER; and 186, 204, and 225 mV at 50, 100, and 300 mA cm −2 for the OER, respectively. Experimental and first principle calculations demonstrate that Co atoms coupling with edge Ni atoms results in d‐electron delocalization on Co/N-NiMo 3 S 4 , signifying the efficient charge transfer to improve overall water electrolysis. In addition, an upshift in the d‐band center of Co/N-NiMo 3 S 4 can optimize the free energies of a variety of reaction intermediates for water adsorption and dissociation; thereby facilitating the robust alkaline overall water electrolysis at 1.47 V. This work therefore greatly deepens the understanding of the bifunctional hydrogen and oxygen evolution reaction of Chevrel-phase electrocatalysts.
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Journal of Energy Storage
·
2023
·
IF 9.4
Zengcai Guo,Jianpeng Mu,Junpeng Wang,Jingbo Mu,Hongwei Che,Feng Li,Hang Yang,Lixin He,Fangfang Wei
How to design and synthesize of advanced MOF-based electrode materials for high-performance supercapacitors is still a huge challenge, herein, CoNi-MOF@Ni 3 S 2 and ZIF-67/Ni 3 S 2 with unique heterostructures are rationally designed and constructed. The composite electrode materials not only make up for the poor conductivity of MOF, but also improve the structural stability of Ni 3 S 2 . As expected, the optimized ZIF-67/Ni 3 S 2 and CoNi-MOF@Ni 3 S 2 electrode demonstrates a remarkably enhanced specific capacitance of 1017.13 F g −1 and 1930.04 F g −1 at 1 A g −1 , respectively, which are higher than those of their respective monomeric components. Finally, ZIF-67/Ni 3 S 2 //AC and CoNi-MOF@Ni 3 S 2 //AC devices were assembled, which delivered an impressive energy density of 94.49 and 125.34 Wh kg −1 , along with the corresponding power density of 966.34 W kg −1 971.86 W kg −1 , respectively. Moreover, by comparison, the CoNi-MOF@Ni 3 S 2 electrode material exhibits better supercapacitor performance than ZIF-67/Ni 3 S 2 . This effective protective strategy provides an alternative way for constructing MOF or sulfide electrodes with remarkably improved energy storage performance.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 37
·2302058
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IF 27.8
Zhenzhen Liu,Huaimeng Li,Miaomiao Han,Liang Fang,Zhen Fu,Haimin Zhang,Guozhong Wang,Yunxia Zhang
Faced with the forthcoming tide of retired lithium-ion batteries (LIBs), it is imperative to explore effective regeneration and upcycling strategies to alleviate the resource shortage, address environmental pollution, and cater to the demand for high-energy-density cathode materials. Herein, a facile, non-constructive, one-stone-for-three-birds solid-phase sintering strategy is proposed to regenerate the degraded LiCoO 2 (D-LCO) cathode and even upgrade its stability at high voltages, in which three birds, i.e., lithium supplement, Li 2 SO 4 coating, and Mn doping into Co sites while N, S doping into Li-O slabs are simultaneously hit with one stone (one-pot solid-phase sintering). Benefiting from these favorable characteristics, the upcycled cathode not only yields high discharge-specific capacity of 188.2 mAh g −1 at 0.2 C, but also delivers superior cycling performance with 92.5% of capacity retention after 100 cycles (86.4% after 300 cycles) at 0.5 C and excellent rate capability at a high cutoff voltage of 4.5 V, superior to a freshly commercial counterpart. This work is expected to provide meaningful guidance for the upcycling of D-LCO into high-energy-density batteries with long-term cycling stability.
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ACS Nano
·
2023
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IF 17.1
Yu Cheng,Lifang Zhang,Sai Wang,Mengfan Wang,Chengwei Deng,Yi Sun,Chenglin Yan,Tao Qian
The batch production of high-purity hydrogen is a key problem that restricts the progress of fuel cells and the blueprint for achieving carbon neutrality. Transition-metal chalcogenide heterojunctions exhibit certain activity toward electrochemical overall water splitting (EOWS), but their high-current-density catalytic performances are still unsatisfactory due to the slow kinetic progression (H* or *O → *OOH). Inspired by the “electron pocket” theory, we designed a Ni-Mo bimetallic disulfide interface heterojunction electrocatalyst system (NM-IHJ-V) with high electronic storage capacity around the Fermi level (−0.5 eV, +0.5 eV) (e-DFE), which injects more power into the kinetic progression processes of intermediate species in the EOWS process. Consequently, it achieves a superhigh current density of 2 A cm–2 level for EOWS (only 1.98 V voltage is needed), which is 11.23-fold higher than that of the benchmarked Pt/C//IrO2 (178 mA cm–2@1.98 V), as well as an excellent long-term stability of 200 h. Most strikingly, NM-IHJ-V can efficiently produce hydrogen at currents up to 5 A. Our proposed strategy of constructing catalysts to produce hydrogen at superhigh current density through the electron pocket theory will supply valuable insights for the designing other catalytic systems.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 30
·14217-14224
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IF 3.3
Min Wang,Zhiwei Huang,Zhongmin Feng,Zhuqing Wang
With the rapid economic development, electronic waste is increasing year by year, but its recovery rate is low and there are few materials for selective and efficient recovery of gold from low concentration gold-containing solutions. Therefore, we designed and prepared a polymer nanomaterial poly(m-phenylenediamine) (PmPD) containing a large number of reducing groups. The material is simple to prepare and can selectively recover low concentrations of gold from acidic solutions (pH = 3.0) within 60 min. In addition, the material can be used to recover gold from river water, lake water and tap water. It has good selective recovery for both low (10 mg g−1) and high (50 mg g−1) concentration gold solutions in the presence of different metal ions. PmPD has some redox ability to recover 1490 mg g−1 of Au(III). In addition, PmPD has a good economic effect because it can be recycled many times.
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Materials Today Physics
·
2023
·
IF 11.5
Lin Long,Xiaosi Qi,Lei Wang,Shaohong Cai,Mingsen Deng
Magnetic-dielectric nanocomposites with excellent synergetic effect were deemed as the ideal candidates for high-performance microwave absorbers (MAs). Herein, we adopted a simple hydrothermal route and hydrogenous reduction to synthesize magnetic-dielectric CoFe@MoO 2 /MoS 2 flower-like multicomponent nanocomposites (MCNCs). By controlling the different reduction temperature and time, the content of component (i.e., CoFe, MoO 2 and MoS 2 ) can be easily tuned, which is conducive to adjust electromagnetic parameter and optimize magnetic loss. Results demonstrated that the CoFe@MoO 2 /MoS 2 flower-like MCNCs could be easily regulated by simply changing the content of CoFe in favor of improved magnetic loss and optimized impedance matching. So, the prepared magnetic-dielectric CoFe@MoO 2 /MoS 2 flower-like MCNCs presented the minimum reflection loss of −55.91 dB and the widest effective bandwidth of 7.24 GHz. The strategies for adjusting rich interfaces and optimized magnetic loss are very instructive for the development of high-performance MAs and devices.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Dan Li,Jiahui Yang,Shuang Lv,Xiaopeng Li,Li Shao,Caiyun Zhou,Feigao Xu
Unique Fe3S4/Cu2O composites were constructed with high Fenton-like photocatalytic activity through the impregnation coprecipitation method. The structure, morphology, optical, magnetic, and photocatalytic properties of the as-prepared composites were explored in detail. The findings suggest that small Cu2O particles were grown on the surface of Fe3S4. The removal efficiency of TCH by Fe3S4/Cu2O was 65.7, 4.75, and 3.67 times higher than that of pure Fe3S4, Cu2O, and the Fe3S4 + Cu2O mixture, respectively, when the mass ratio of Fe3S4 and Cu2O was 1:1 at pH 7.2. The synergistic effect between Cu2O and Fe3S4 was the main factor for TCH degradation. The Cu+ species from Cu2O increased the Fe3+/Fe2+ cycle during the Fenton reaction. •O2– and h+ were the main active radicals; however, •OH and e– played the second role in the photocatalytic degradation reaction. Moreover, the Fe3S4/Cu2O composite retained good recyclability and versatility, and could be conveniently separated by a magnet.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yunpeng Wang,Yue Niu,Ruiting Hao,Jing Zhou,Meng Guo,Ying Liu,Wenbo Liu,Yanwei Chang,Hao Li,Yao Wang,Guofu Zhou
Structure nanocrystallization dramatically enhances the specific surface area and is one of the most popular methods for preparing high-performance gas sensing materials. However, most of the preparation methods are suffering high-cost and long time-consuming. This work synthesized Cu 2 ZnSnS 4 (CZTS), a cost-effective and stable direct-bandgap semiconductor with cauliflower-like morphology by facile solution drop coating and low-temperature annealing. The morphology and gas sensing performance of CZTS films could be modulated by controlling the annealing time. The gas sensors showed a significant response toward ppb-level NO 2 (1.287 toward 50 ppb) with a short response, recovery time, and high selectivity at room temperature (25 °C). It is worth mentioning that the limit of detection is 50 ppb, which is the first report on the ppb-level detection ability of CZTS-based NO 2 gas sensors. The enhanced sensitivity of the cauliflower-like CZTS nanocrystal-based gas sensor can be ascribed to the small grain size, large specific surface area for effective gas diffusion, and excellent conductivity of the spherical packed structure.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hu Wang,Jun Tang,Juan Xie
Corrosion inhibition effects of asymmetric gemini corrosion inhibitor on N80 steel in a CO 2 -saturated brine solution had been investigated by weight loss and electrochemical measurements. The synergistic effects of gemini with thiourea (TU), thiazole (TZ) and pyridine (PD) were also studied with weight loss and electrochemical measurements. The results revealed that asymmetric gemini corrosion inhibitor displayed excellent corrosion inhibition performance at 70°C in CO 2 -saturated brine solution. The inhibitor was anodic type in nature. There existed apparent synergistic effect between asymmetric gemini inhibitor and other ingredients. The mixture inhibitors can provide excellent protection to N80 steel at test condition. The best formula of mixture inhibitors was then presented. The synergistic mechanism of gemini with other ingredients were also discussed.
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BIOELECTROCHEMISTRY
·
2023
·
IF 5
Jianhua Yan,Kaidi Wang,Hongjie Liu,Liwei Wang,Yixiang Li,Guoqing Zhang,Li Deng
MiRNA-155 is a typical biomarker for breast cancer. Since its low concentration in the physiological environment and the limitations of conventional miRNA detection methods like Northern imprinting and RT-qPCR, convenient, real-time, and rapid detection methods are urgently needed. In this work, an electrochemical biosensor was constructed based on the flower-like MoSe 2 @1T-MoS 2 heterojunction electrode material and specific RNA recognition probes, which can realize the rapid determination of miRNA-155 content with a wide detection range from 1 fM to 1 nM and a limit of detection (LOD) as low as 0.34 fM. Furthermore, the contents of miRNA-155 in blood samples of tumor-bearing mice and normal mice were measured as 724.93 pM and 21.42 pM, respectively by this biosensor, demonstrating its strong identification ability and miRNA-155 can be regarded as an ideal diagnostic marker. On this basis, a portable sensor platform was designed for on-site detection simulation and showed good recovery efficiency from 95.80% to 98.69%. Meanwhile, compared with the standard detection method RT-qPCR, the accuracy and reliability of the biosensor were verified, indicating that the biosensor has the potential to provide point-of-care testing (POCT) for the early diagnosis of breast cancer.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ziyong Chang,Baili He,Xiaosha Gong,Xiaoyue Qi,Kexin Liu
Preparation of efficient adsorbents is of great significance for the recovery of precious metals from secondary resources. Herein, –NH 2 was successfully grafted on MIL-101(Cr) via hydrothermal reaction to improve the adsorption capacity of Au (Ⅲ) in aqueous solution. MIL-101(Cr)–NH 2 had a huge specific surface area (1016.50 m 2 ‧g −1 ), which can provide more adsorption sites for Au (III). At 298 K, the maximum adsorption capacity of Au (III) by MIL-101(Cr)–NH 2 was 792.43 mg∙g −1 and was higher than that by MIL-101(Cr) (140.83 mg∙g −1 ). The adsorption data was well fitted by Langmuir and pseudo-second-order models, confirming that the adsorption process conformed to single molecule adsorption and chemical adsorption . Mechanism study indicated that the adsorption of Au (III) by MIL-101(Cr)–NH 2 was initiated with electrostatic attraction and promoted by reduction and inner complexation between AuCl 4 - and protonated amino groups. During adsorption, Au (Ⅲ) was reduced to Au (0) and Au (I) by –NH 2 . Density functional theory (DFT) calculation demonstrated that MIL101(Cr)–NH 2 possessed higher binding affinity and more adsorption sites for Au (III) than MIL-101(Cr). Moreover, MIL-101(Cr)–NH 2 exhibited excellent selectivity towards Au (III) and good recyclability, which is promising in the recovery of precious metals.
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