JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Rui Feng,Yao Chu,Xiaohao Wang,Qinfeng Wu,Fei Tang
Flexible biosensors have the great potential to be applied in medical diagnosis, wearable devices, fermentation and other fields. This paper proposes a manufacturing scheme of a flexible enzymatic glucose sensor coated with polyurethane modified by poly(ethylene glycol), PU-PEG, as a protective membrane, which can overcome the problems of poor consistency and short service life of the electrochemical sensor. A platinum-black electrode formed by electroplating platinum-black nanoparticles onto a flexible gold electrode is used as an enzyme carrier. The enzyme is electrosprayed evenly onto the electrode to avoid aggregation and to control quality. Glutaraldehyde is used as a cross-linking agent to immobilise the enzyme layer. Additionally, using PU-PEG as the protective membrane improves the anti-interference performance, controls the enzymatic reaction rate and makes long-term stable operation of the sensor possible. The experimental results show that the linear range of the sensor is 0.5 ~ 25 mM, the minimum detection limit is 0.25 mM, and the sensitivity is as high as 3.418 μA/mM. The measurement results of the sensors show good consistency, with a maximum absolute deviation of only 5.52%. The effective working time in 37℃ bovine serum with a glucose concentration of 5 mM is up to 23 days.
研究领域:
生物传感器
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医疗诊断
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可穿戴设备
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发酵
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2796
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IF 5
Tao Ming,Tingting Lan,Mingxing Yu,Hong Wang,Juan Deng,Deling Kong,Shuang Yang,Zhongyang Shen
Continuous in vivo monitoring (CIVM) of pH value is essential for personalized medicine, as many diseases are closely related to acid–base imbalances. However, conventional pH meters are limited in their ability to perform CIVM due to excessive blood consumption, large device volume, frequent calibration, and inadequate real-time monitoring. There is thus an urgent need for a portable method for CIVM of pH value. To address this need, we propose a minimally invasive, continuous monitoring solution in the form of an implantable pH microneedle sensor (MNS) in this study. The MNS is based on the integration of an acupuncture needle (AN) and a Ag/AgCl reference electrode. We fabricate the sensor by electrochemically depositing platinum black and gold nanoparticles onto the AN and further modifying it with polyaniline to increase its sensitivity to hydrogen ions. The pH value is obtained by calculating the open circuit voltage between the modified AN and the reference electrode. The resulting MNS demonstrates excellent selectivity and a high nernstian response to pH (−57.4 mV per pH) over a broad range (pH = 4.0 to pH = 9.0). Both in vitro and in vivo experiments have verified the performance of the sensor, showcasing its potential for biomedical research and clinical practice. The MNS provides an alternative to conventional pH meters, offering a less invasive and more convenient way to perform CIVM of pH value. Moreover, this electrochemical implantable sensor based on AN and silver wires provides a simple and sensitive method for continuous in vivo detection of other biomarkers.Keywords:polyaniline;electrochemical sensor;nanocomposites;continuous in vivo monitoring;pH value
研究领域:
生物医学工程
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分析化学
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纳米技术
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Shuai Li,Yimei Zhang
Enhancing the energy efficiency of hydrogen evolution reaction (HER) represents a significant yet challenging goal. One promising approach to achieve this is developing catalysts with high activity and robust stability to couple HER with Fenton reaction. Herein, mesoporous nanosheet arrays (MNA) with featuring a mean pore size of 25 nm, was fabricated via a hydroxide precursor annealing strategy. The produced Co-P MNA 25 and Fe-Co-P MNA 25 are applied in HER and Fenton reaction, respectively. Compared to the MNA 12 synthesized by traditional method of self-growth and solid-phase phosphorization, the MNA 25 exhibited remarkable enhancement in performance, including a 49 % reduction in HER overpotential at 10 mA cm −2 , a 41 % increase in pseudo-first-order degradation kinetics of methylene blue in Fenton reaction, along with superior stability. In addition, the MNA 25 based flow reactor, which couples the two reaction and features a fastener-free design, demands just a minimal voltage of 1.61 V to drive, demonstrating impressive energy efficiency (81.56 % for HER and 2.77 g kWh −1 for Fenton) and application potential. More importantly, numerical simulations reveals that the larger pore size in MNA not only facilitated faster electrolyte diffusion, but also enhanced its impact buffer performance, thereby improving its catalytic activity and stability. Our work unveils the mechanism of mesopore size on the electrochemical performance of catalysts at the theoretical level, which offers a promising avenue for enhancing the energy efficiency of HER.
研究领域:
材料科学
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电化学
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催化作用
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Jiaqun Zou,Bingen Yuan,Chuanxi Zhao,Jianxin Wang,Haoqi Qiu,Jiaxin Dang,Qin Wang,He Miao,Jinliang Yuan
Cobalt (Co) is widely used in energy storage and conversion devices, although its content on our planet is not adequate. Therefore, recycling Co from the spent Co-enriched materials is indispensable. Co-based perovskites , which contain abundant Co, are extensively utilized in solid oxide fuel cells, three-way catalysts, and oxygen-permeable membranes, and the recovery of Co from the spent Co-based perovskites is necessary to meet the long-term requirement of Co. In this work, a facile and universal thermal reduction method (750 °C and N 2 atmosphere) is employed to convert the spent cobalt-based perovskites into high-performance bifunctional oxygen catalysts for zinc-air batteries (ZABs), achieving high-efficient Co recovery and re-utilization. At high temperatures, melamine and dopamine hydrochloride are transformed into carbon nanotubes , C 3 N 4 and reducing gases (such as NH 3 and H 2 ). Simultaneously, the metal elements in the spent Co-based perovskites (SrNb 0.1 Co 0.7 Fe 0.2 O 3 ,SNCF) are converted into nano-scale alloy particles and metal nitrides . Then, the phase structures, micromorphology, and element valences of the obtained multiphase oxygen catalyst (SNCF–Ni-PM) are characterized by X-ray diffraction, scanning/transmission electron microscopy, and X-ray photoelectron spectroscopy, respectively. The electrochemical properties , including oxygen catalytic activities and stability, of SNCF-Ni-PM are measured by linear sweep voltammetry , chronopotentiometry, chronoamperometry, and cyclic voltammetry methods. Considering the practical applications, the aqueous and solid-state ZABs are assembled and measured. The results demonstrate that the multiphase SNCF-Ni-PM mainly includes carbon nanotubes, C 3 N 4 nanosheets , and FeNiN or CoFe nanoparticles . Moreover, SNCF-Ni-PM exhibits excellent bifunctional oxygen catalytic activity, with an oxygen evolution reaction (OER) potential at 10 mA cm −2 of 1.51 V and an oxygen reduction reaction (ORR) half-wave potential of 0.77 V, outperforming most of the reported oxygen catalysts. Using SNCF-Ni-PM, the aqueous and solid-state ZABs can achieve high power densities of 295.9 and 228.4 mW cm −2 , respectively, being superior to most ZABs. In addition, the aqueous ZAB with SNCF-Ni-PM can operate stably for 300 h with a slight degradation. This work provides a feasible method for effectively recycling Co from the spent Co-based perovskites.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhuang Wang,Mian Li,Wenping Cao,Xiangjie Bo
Enhancing catalytic efficiency, achieving controlled synthesis, and lowering production costs are crucial for promoting the use of cobalt oxide (CoOx)/cobalt nitride (CoNx) composites in full water splitting and electrochemical sensing. In this study, a three-dimensional (3D) hierarchically porous material composed of numerous two-dimensional (2D) porous CoOx/CoNx nanosheets (denoted as CoOx/CoNx NSs) was synthesized by using cobalt oxalates (COs) recycled from spent lithium-ion batteries. In a 1.0 M KOH solution, the 2D porous CoOx/CoNx NSs exhibited higher oxygen evolution reaction (OER) electrocatalytic activity than commercial ruthenium oxide (RuO2). Meanwhile, the CoOx/CoNx NSs exhibited a slightly lower hydrogen evolution reaction (HER) electrocatalytic activity than 20 wt % platinum/carbon (Pt/C). Moreover, the CoOx/CoNx NS-based full water-splitting electrolyzer achieved a current density of 10 mA cm–2 at 1.562 V, which was 49 mV more positive than the 1.489 V of the Pt/C||RuO2 benchmark. Furthermore, the 2D porous CoOx/CoNx NSs featured significantly higher HER, OER, and full water-splitting catalytic stability than Pt/C/RuO2. Moreover, the CoOx/CoNx NS-based nonenzymatic electrochemical sensor exhibited advanced glucose detection performance. Particularly, the sensor had a wide linear range of 1.0–10.5 mM), a low detection limit of 5.0 μM), and a fast response time of 0.6 s. The 2D porous CoOx/CoNx NSs exhibited excellent catalytic activity owing to their 3D hierarchically porous architectures, large surface area, good conductivity, uniformly dispersed active sites, and synergistic effects of CoNx and CoO. This study presents an advanced model for recycling Co metal from spent devices and designing advanced Co-based electrocatalysts for water splitting and electrochemical sensing.
研究领域:
材料科学
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环境科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Zhuang Wang,Mian Li,Bin Fu,Wenping Cao,Xiangjie Bo
Although cobalt nitride (CoN)-based nanomaterials have been widely designed as advanced oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR) catalysts, the continuous consumption of lithium-ion batteries (LIBs) has led to a high price of cobalt metal. Therefore, in the future, recycling valuable Co elements from spent devices and boosting their service efficiency will inevitably promote the utilization of Co-based materials in water splitting and zinc-air batteries (ZABs). Herein, we realize the Co recycling from spent LIBs by a simple hydrometallurgy method. Under the assistance of hexamethylenetetramine and polystyrene spheres, after the hydrothermal and pyrolysis treatment in the NH 3 atmosphere, the as-reclaimed cobalt oxalates were successfully transformed into novel three-dimensional (3D) CoN nanoflowers (denoted as CoN NFs). Benefiting from the unique 3D flower-like architectures, intrinsic high conductivity, large surface area, uniformly dispersed CoN nanoparticles, and the synergistic effect between Co 3 N and CoO phases, the 3D flower-like CoN NFs exhibited excellent OER catalytic activity. The performance was much better than commercial RuO 2 in the 1.0 M KOH solution. Furthermore, the CoN NFs-based water splitting cell needed a voltage of 1.608 V to achieve the current density of 10 mA cm −2 , which is even 16 mV smaller than that of Pt/C||RuO 2 benchmark (1.624 V). Meanwhile, the CoN NFs-derived ZAB exhibited a high peak power density of 107.3 mW cm −2 (vs. 103.2 mW cm −2 of Pt/C-RuO 2 -based ZAB) and a low charge–discharge voltage gap (0.93 V vs. 1.43 V of Pt/C-RuO 2 -based ZAB). Due to the excellent structural and elemental stabilities, the corresponding water splitting cell and ZAB had outstanding durability. This work successfully explored an advanced industrial chain from recycling Co metal in spent devices to designing the high-efficiency HER/OER/ORR electrocatalysts for advanced water splitting devices and ZABs. This will further promote the value-added utilization of valuable Co metal in various energy storage or conversion devices.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chuhan Tang,Wei Shan,YiRan Zheng,Liang Zhang,Yuxin Liu,Bin Liao,HeDong Chen,Xianhua Hou
The widespread application of Lithium-ion Batteries (LIBs) has led to a significant increase in the number of spent LIBs. Consequently, the recycling and utilization of spent LIBs have become an inevitable choice for recovering valuable resources and protecting the environment, aligning with the principles of sustainable development. This study reports an iron air battery recycling system that is capable of recovering both Li/Co and energy from spent LiCoO 2 cathode materials and the separation reaction is completely spontaneous. Meanwhile, lithium and cobalt were successfully recovered from the powdered leach solution of spent LiCoO 2 cathode material, and it was preliminarily demonstrated that spent iron could be used as a sacrificial anode for the system. Several key parameters affecting recovery are optimized, including anode solution pH, discharge current density, and concentration of the solution to be recovered. Under the conditions of anode solution pH of 1.8, discharge current density of 0.1 mA cm −2 , and concentration of recovery solution of 0.15 mol/L, the system can be operated stably for more than 24 h, and the recoveries of Li + and Co 2+ can be up to 1.49 mg h −1 and 18.75 mg h −1 respectively, and the output energy can reach 75.15 kJ/mol. This research not only provides a sustainable and cost-effective method of disposing of used lithium-ion batteries, but also offers up new possibilities for the disposal of scrap iron.
研究领域:
环境科学
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材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fanjia Sun,Yanhui Wang,Xueqing Tian,Rui Zhu,Ziliang Zhuang,Youbin Zheng,Jianbing Zang,Liang Dong
Electrocatalysts with high activity and corrosion resistance, tailored for industrial-grade current densities, played a crucial role in seawater electrolysis. Here, we synthesized a petal-like Cr-doped NiFe phosphate 'semi-coated' phosphide heterostructure electrocatalyst grown on nickel foam (Cr-NiFeP/PO 3 @NF). This catalyst demonstrated superior catalytic performance in natural seawater, maintaining stability and only a slight increase in cell voltage after operating continuously for 100 h at a current density of 1 A cm −2 . The incorporation of Cr introduced a significant number of unpaired electrons, which enhanced the conductivity of the catalyst, facilitated the creation of electron depletion regions around Ni and Fe, and improved the interaction with adsorption intermediates. Furthermore, the high activity and corrosion resistance during the oxygen evolution reaction (OER) were due to the interaction between the in-situ formed high-valent phosphate and NiFeCrOOH during the anodization process.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Qi Ling,Kui Yan,Ziwei Zhao,Zihan Zhou,Zhaoqi Sun,Lei Yang,Miao Zhang
Due to the growing demand for clean renewable hydrogen fuel , the rational design of electrode materials' composition and structure holds significant importance in achieving efficient energy storage and conversion in electrochemical energy devices. In this study, we synthesize NiCo-MOF74/NF substrate using a one-step hydrothermal method , after which we successfully deposit a layer of Ru metal nanoclusters on the substrate by electrodeposition . Ru NCs@NiCo-MOF74/NF exhibits an exceptionally large specific surface area and excellent interface effects, demonstrating outstanding performance in both overall water splitting and supercapacitor applications. In a 1 M KOH alkaline solution, the device requires only 1.47 V output voltage to deliver a current density of 10 mA cm −2 for overall water splitting. As a supercapacitor , the unique nanoflower structure of Ru NCs@NiCo-MOF74/NF enables fast and reversible Faradaic reactions, providing high specific capacitance and rate performance. It shows a high areal capacitance of 1.664 mAh cm −2 at 1 mA cm −2 , indicating excellent charge storage capacity. Assembled into an asymmetric supercapacitor (ASC) with Ru NCs@NiCo-MOF74/NF as the positive electrode , the device achieves a high energy density of 511.88 μWh cm −2 at a power density of 545.68 μW cm −2 . After 5000 cycles, the capacitance retention rate is approximately 100 %, demonstrating remarkable cycling stability. This paves the way for the synthesis of multifunctional catalysts, opening up new possibilities in the field.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Boyan Ai,Guoxiang Wang,Pengchao Liang,Jinxiu Bing,Majie Zhang,Qingwang Min,Xinxin Zhang
The development of highly active and acid-stable Ru-based electrocatalysts is of great significance for water electrolysis but remains a huge challenge due to serious Ru corrosion in an acid medium. Herein, we prepared oxygen vacancy (O V )-rich Nd-doped RuO 2 nanocrystals by facile synthesis via hydrothermal and subsequent annealing for efficient overall water splitting. The catalyst exhibits an overpotential of only 200 mV for OER and 44 mv for HER at the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 electrolyte. Nd-doped RuO 2 only demands a cell voltage of 1.52 V to drive the overall water splitting reaction and displays excellent stability for 100 h. Density functional theory further revealed that the newly constructed Nd-doped RuO 2 sites activate the difficult to react *O intermediates, reducing the adsorption energy of the OER intermediates to effectively minimize the Gibbs free energy (*O to *OOH) of the reaction rate-determining step and regulate the center of the active site d-band. The synergistic effect of aliovalent doping and vacancy engineering contributes to the excellent electrocatalytic performance of Nd-doped RuO 2 . This performance control strategy can pave the way for the development of effective and economically viable catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jihan Wu,Ying Chang,Shaohong Guo,Aiju Xu,Jingchun Jia,Meilin Jia
Ruthenium-based nanomaterials are considered to be promising electrocatalysts for HER due to their higher activity. However, the active site exposure is low, and the catalytic mass activity is low. In order to achieve the particular aims, several types of engineering, such as crystal engineering, topography engineering, heterostructures and support engineering, have been used to catalysts. Here we report RuO 2 supported on CeO 2 -NC, owing to the abundant heterostructures and the presence of oxygen vacancies, the RuO 2 /CeO 2 -NC catalyst showed outstanding HER performance (98.2 mV, 53 mV and 298 mV@100 mA cm −2 in acidic, alkaline and neutral, respectively). Moreover, RuO 2 /CeO 2 -NC also has an excellent electrocatalytic durability for 40 h. The experimental achievements show that oxygen vacancies and heterostructures could jointly enhance performance of catalyst HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yuanhua Xiao,Shiwei Zhang,Ya Shen,Jinhui Shou,Yang Kong,Dangcheng Su,Xuezhao Wang,Qingxiang Yang,Dafeng Yan,Chengguo Sun,Shaoming Fang
Co 9 S 8 has been extensively studied as a promising catalyst for water electrolysis. Doping Co 9 S 8 with Fe improves its oxygen evolution reaction (OER) performance by regulating the catalyst self-reconfigurability and enhancing the absorption capacity of OER intermediates. However, the poor alkaline hydrogen evolution reaction (HER) properties of Co 9 S 8 limit its application in bifunctional water splitting. Herein, we combined Fe doping and sulfur vacancy engineering to synergistically enhance the bifunctional water-splitting performance of Co 9 S 8 . The as-synthesized Co 6 Fe 3 S 8 catalyst exhibited excellent OER and HER characteristics with low overpotentials of 250 and 84 mV, respectively. It also resulted in the low Tafel slopes of 135 mV dec −1 for the OER and 114 mV dec −1 for the HER. A two-electrode electrolytic cell with Co 6 Fe 3 S 8 used as both the cathode and anode produced a current density of 10 mA cm −2 at a low voltage of only 1.48 V, maintaining high stability for 100 h. The results of in/ex-situ experiments indicated that the OER process induced electrochemical reconfiguration, forming CoOOH/FeOOH active species on the catalyst surface to enhance its OER performance. Density functional theory (DFT) simulations revealed that Fe doping and the presence of unsaturated coordination metal sites in Co 6 Fe 3 S 8 promoted H 2 O and H* adsorption for the HER. The findings of this study can help develop a strategy for designing highly efficient bifunctional water splitting electrocatalysts.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）