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Electroanalysis of Biochemistry and Material Chemistry—2nd Edition
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Electroanalysis of Biochemistry and Material Chemistry—2nd Edition

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Electrochemistry".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 6375

Special Issue Editor

Prof. Dr. Guangjin Wang

E-Mail Website
Guest Editor
School of Materials Science and Hydrogen Energy, Foshan University, Foshan, China
Interests: electrocatalysis; computational electrochemical; nano electrochemical; electrochemical bio-sensors; low-temperature fuel cells; supercapacitors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electroanalysis is a useful tool for measuring the variation in the electrical parameters of electrode materials by controlling operating parameters. Based on compatibility and feasibility, electroanalysis plays a role as the bridge between empirical analytical chemistry and rationalistic physical chemistry. Due to its dynamic interaction with other disciplines (such as biochemistry and material chemistry), electroanalysis has been able to provide solutions for basic problems in biochemistry and material chemistry. Therefore, this Special Issue, titled “Electroanalysis of Biochemistry and Material Chemistry”, focuses on the most recent advances in the application of electroanalytical methods the field of biochemistry and material chemistry. Original research and reviews on advances in analytical voltammetry, potentiometry, conductometry and electrolytic methods, and electrochemical devices (such as electrochemical bio-sensors, fuel cells, batteries, and supercapacitors) are welcome.

Prof. Dr. Guangjin Wang
Guest Editor

Manuscript Submission Information

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Keywords

  • voltammetry
  • potentiometry
  • conductometry
  • electrolytic method
  • electrochemical bio-sensors
  • fuel cells
  • batteries
  • supercapacitors

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Related Special Issue

Published Papers (7 papers)

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Research

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15 pages, 2965 KiB  
Article
NiMoS-Modified Carbon Felt Electrode for Improved Efficiency and Stability in a Neutral S/Fe Redox Flow Battery
by Dan Mei, Bowen Liu, Haiqing Ma, Zhaoguo Zhang, Fan Wu, Yanan Chen, Jawad Ali, Futang Xing and Liangbin Xiong
Molecules 2025, 30(6), 1219; https://doi.org/10.3390/molecules30061219 - 8 Mar 2025
Viewed by 628
Abstract
Polysulfide-ferricyanide redox flow batteries (PFRFBs) are gaining significant attention in long-duration energy storage for their abundant availability and environmental benignity. However, the sluggish kinetics of the polysulfide redox reactions have tremendously constrained their performances. To address this issue, we developed a NiMoS catalyst-modified [...] Read more.
Polysulfide-ferricyanide redox flow batteries (PFRFBs) are gaining significant attention in long-duration energy storage for their abundant availability and environmental benignity. However, the sluggish kinetics of the polysulfide redox reactions have tremendously constrained their performances. To address this issue, we developed a NiMoS catalyst-modified carbon felt (NiMoS-CF) electrode, which significantly accelerates the electrochemical reaction rates and enhances the cycling stability of PFRFB. Our PFRFB system, integrated with the NiMoS-CF electrode, exhibited an energy efficiency of 70% and a voltage efficiency of 87%, with a remarkable doubling of its cycle life as opposed to the pristine carbon felt (CF) electrode at a current density of 40 mA cm−2. Notably, during 2500 cycles of charge–discharge testing, we achieved an average coulombic efficiency exceeding 99%. These improvements in PFRFB performance can be attributed to the NiMoS-CF electrode’s large surface area, low resistance, and robust redox activity. This study offerings a novel approach for enhancing the electrochemical reaction kinetics and cycling stability in PFRFBs, laying a scientific foundation in the applications of practical PFRFBs for next-generation energy storage. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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14 pages, 6296 KiB  
Article
Enhanced Coercivity and Tb Distribution Optimization of Sintered Nd-Fe-B Magnets by TbF3 Grain Boundary Diffusion Facilitated by Ga
by Ling Wang, Wenjiao Li, Xiaopeng Wang, Zejun Deng and Shujuan Gao
Molecules 2025, 30(3), 594; https://doi.org/10.3390/molecules30030594 - 28 Jan 2025
Viewed by 813
Abstract
The grain boundary diffusion process employing a mixed diffusion source, comprising heavy rare-earth elements and low-melting metals, significantly enhances the coercivity (Hcj) of sintered Nd-Fe-B magnets. In the present study, Tb and Ga were deposited onto the surface of Nd-Fe-B magnets [...] Read more.
The grain boundary diffusion process employing a mixed diffusion source, comprising heavy rare-earth elements and low-melting metals, significantly enhances the coercivity (Hcj) of sintered Nd-Fe-B magnets. In the present study, Tb and Ga were deposited onto the surface of Nd-Fe-B magnets to serve as a diffusion source for improving hard magnetic properties. The effects of varying deposition sequences of Tb and Ga on the magnetic properties and microstructure of the magnets were analyzed. The findings demonstrate that TbF3 grain boundary diffusion facilitated by Ga effectively increases the efficiency of Tb substitution, leading to enhanced coercivity. When Tb and Ga are deposited simultaneously, coercivity shows a notable improvement of 53.15% compared to the untreated magnet, with no reduction in remanence. Additionally, thermal stability is enhanced, resulting in superior overall magnetic properties. Microstructural analysis reveals that Ga promotes the diffusion of Tb into the magnet. In the magnet where Tb and Ga are co-deposited, the formation of a thinner and more uniform (Nd,Tb)2Fe14B shell–core structure, along with the greater infiltration depth of Tb, leads to a broader distribution of core–shell structures within the magnet. This effectively increases the anisotropy fields (HA) of the main phase grains, preventing the nucleation of antiferromagnetic domains at the edges of main-phase grains, thereby enhancing coercivity. Furthermore, the corrosion resistance of the magnet subjected to mixed diffusion is improved. This study provides a foundation for producing highly efficient magnets with a lower content of heavy rare-earth elements. The simplicity and flexibility of the process make it highly suitable for industrial applications. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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10 pages, 5570 KiB  
Article
Facile Growing of Ni-MOFs on Ni Foam by Self-Dissociation Strategy for Electrochemical Energy Storage
by Hongmei Li, Yang Li, Shuxian Song, Yuhan Tian, Bo Feng, Boru Li, Zhiqing Liu and Xu Zhang
Molecules 2025, 30(3), 513; https://doi.org/10.3390/molecules30030513 - 23 Jan 2025
Viewed by 650
Abstract
Metal–organic frameworks (MOFs) with redox metal centers have come into view as potential materials for electrochemical energy storage. However, the poor electrical conductivity largely impedes the potentiality of MOFs to construct high-performance electrodes in supercapacitors. In this work, a self-dissociation strategy has been [...] Read more.
Metal–organic frameworks (MOFs) with redox metal centers have come into view as potential materials for electrochemical energy storage. However, the poor electrical conductivity largely impedes the potentiality of MOFs to construct high-performance electrodes in supercapacitors. In this work, a self-dissociation strategy has been applied to construct Ni-MOF microbelts on Ni foam (NF), where the NF is used as both a support and a Ni source. The transmission channels between the Ni-MOF and NF are favorable for the charge transport due to the in situ self-assembly of the TPA linkers with the dissociated Ni ions from the Ni foam. The grown Ni-MOF microbelt arrays can offer abundant active sites for redox reactions. The prepared Ni-MOF/NF-s electrode can yield a high capacitance of 1124 F g−1 at 1 A g−1 and retains 590 F g−1 at 10 A g−1. This design may offer a controllable protocol for the construction of MOF microbelt arrays on various metal substrates. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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12 pages, 3451 KiB  
Article
Surface Microstructure Study on Corona Discharge-Treated Polyethylene Using Positron Annihilation Spectroscopy
by Jingjing Li, Zhiwei Shen, Liuyang Tie, Tianyuan Long, Qiyue Zhong, Xi Chen, Chongshan Yin, Liguo Liufu, Xianhao Huang, Bangyun Xiong, Xibo Li, Chongxiong Duan and Chunqing He
Molecules 2024, 29(17), 4147; https://doi.org/10.3390/molecules29174147 - 31 Aug 2024
Cited by 1 | Viewed by 1520
Abstract
The microstructure and chemical properties of the corona discharge process could provide an effective method for predicting the performance of high-voltage cable insulation materials. In this work, the depth profile of the microstructure and chemical characteristics of corona discharge-treated PE were extensively investigated [...] Read more.
The microstructure and chemical properties of the corona discharge process could provide an effective method for predicting the performance of high-voltage cable insulation materials. In this work, the depth profile of the microstructure and chemical characteristics of corona discharge-treated PE were extensively investigated using Doppler broadening of position annihilation spectroscopy accompanied with positron annihilation lifetime spectroscopy, attenuated total reflectance Fourier transform infrared spectra, Raman spectra and contact angle measurement. By increasing corona discharge duration, the oxygen-containing polar groups, including hydroxyl, carbonyl and ester groups, strongly contribute to the deterioration of hydrophobicity and the enhancement of hydrophilicity. And the mean free volume size, with a broadening distribution, decreases slightly. The line shape S parameter decreases because of the decrease in free volume elements and the appearance of oxygen-containing groups. Also, the thickness of the degradation layer, determined from the S parameter with positron injection depth, increases and diffuses into the PE matrix. A linear S-W plot within the degradation layer of different corona treatment duration samples indicates the defect type does not change. The S parameter decreases and the W parameter increases with an increasing corona duration. Using a slow positron beam, the nondestructive probe can be used to profile the microstructure and chemical environment across the corona discharge damage depth, which is beneficial for investigating the surface and interfacial insulation materials. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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18 pages, 9174 KiB  
Article
Influence of Bi3+ Doping on Electrochemical Properties of Ti/Sb-SnO2/PbO2 Electrode for Zinc Electrowinning
by Jia Wu, Xuanqi Kang, Shuangwen Xu, Zhen Wei, Shangyuan Xu, Kang Liu, Qing Feng, Bo Jia and Yunhai Wang
Molecules 2024, 29(17), 4062; https://doi.org/10.3390/molecules29174062 - 27 Aug 2024
Viewed by 983
Abstract
Bi3+ doped Ti/Sb-SnO2/PbO2 electrode materials were fabricated by electrodeposition to improve their electrochemical performance in zinc electrowinning. The surface morphology, chemical composition, and hydrophilicity of the as-prepared electrodes were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy [...] Read more.
Bi3+ doped Ti/Sb-SnO2/PbO2 electrode materials were fabricated by electrodeposition to improve their electrochemical performance in zinc electrowinning. The surface morphology, chemical composition, and hydrophilicity of the as-prepared electrodes were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and contact angle. An electrochemical measurement and an accelerated lifetime experiment were also conducted to investigate the electrocatalytic performance and stability of the electrodes. The results show that the Bi3+ modification electrode has an important effect on the coating morphology, the crystal structure, the surface hydrophilicity, the electrocatalytic activity, and the stability. The electrode prepared from the solution containing 2 mmol·L−1 Bi(NO3)3 (marked as the Ti/Sb-SnO2/2Bi-PbO2 electrode) exhibits the best hydrophilicity performance (θ = 21.6°) and the longest service life (1196 h). During the electrochemical characterization analysis, the Ti/Sb-SnO2/2Bi-PbO2 electrode showed the highest oxygen evolution activity, which can be attributed to it having the highest electroactive surface (qT* = 21.20 C·cm−2) and the best charge-transfer efficiency. The DFT calculation demonstrated that the doping of Bi3+ leads to a decrease in the OER reaction barrier and an increase in the DOS of the electrode, which further enhances the catalytic activity and the conductivity of the electrode. Moreover, the simulated zinc electrowinning experiment demonstrated that the Ti/Sb-SnO2/2Bi-PbO2 electrode consumes less energy than other electrodes. Therefore, it is expected that the Bi3+ modified electrode will become a very promising electrode material for zinc electrowinning in the future. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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Review

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26 pages, 6666 KiB  
Review
Recent Advance on Metal Carbides Reinforced Laser Cladding Coatings
by Dazhi Jiang, Guangjin Wang, Wei Dong, Xiaodong Hong and Chenguang Guo
Molecules 2025, 30(8), 1820; https://doi.org/10.3390/molecules30081820 - 18 Apr 2025
Viewed by 237
Abstract
The laser cladding technique can be adapted to fabricate composite coatings on the surface of the metal substrate, which not only effectively improves the surface properties of materials, but also greatly expands their application range. Metal carbides exhibit extremely high hardness, melting point, [...] Read more.
The laser cladding technique can be adapted to fabricate composite coatings on the surface of the metal substrate, which not only effectively improves the surface properties of materials, but also greatly expands their application range. Metal carbides exhibit extremely high hardness, melting point, and outstanding chemical stability. The hardness of carbides is much higher than that of general metal materials. Therefore, various metal carbides serve as reinforcing agents for enhancing the overall performance of metal-based coatings. To date, there is no special review about metal carbide-reinforced laser cladding coatings. In view of the outstanding performance and wide application of metal carbides in laser cladding coatings, herein, recent advances in various metal carbide-reinforced metal coatings are highlighted. According to the type of metal carbides, the whole review is classified into five sections: WC-reinforced coatings, TiC-reinforced coatings, NbC-reinforced coatings, Tin+1AlCn (MAX) reinforced coatings, and Cr3C2, TaC-reinforced coatings. The preparation method, microstructure feature, and application performance of various carbide-reinforced composite coatings are summarized. At last, some prospects are put forward on the current issues and future development directions, aiming to provide comprehensive and in-depth references for the research and application in the field of composite coatings. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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30 pages, 7879 KiB  
Review
Progress in MOFs and MOFs-Integrated MXenes as Electrode Modifiers for Energy Storage and Electrochemical Sensing Applications
by Sanjeevamuthu Suganthi, Khursheed Ahmad and Tae Hwan Oh
Molecules 2024, 29(22), 5373; https://doi.org/10.3390/molecules29225373 - 14 Nov 2024
Viewed by 1107
Abstract
The global energy demand and environmental pollution are the two major challenges of the present scenario. Recently, researchers focused on the preparation and investigation of catalysts for their capacitive properties for energy storage devices. Thus, supercapacitors have received extensive interest from researchers due [...] Read more.
The global energy demand and environmental pollution are the two major challenges of the present scenario. Recently, researchers focused on the preparation and investigation of catalysts for their capacitive properties for energy storage devices. Thus, supercapacitors have received extensive interest from researchers due to their promising energy storage features and decent cyclic stability/performance. The performance of the supercapacitors are significantly influenced by the physicochemical properties of the electrocatalyst. In this review article, we have compiled the previous reports on the fabrication of MOFs-based composite materials with MXenes for energy storage and electrochemical sensing applications. The metallic and bimetallic MOFs and MOFs/MXenes materials for supercapacitor applications are reviewed. In addition, MOFs/MXenes-based hybrid composites are also compiled towards the determination of various toxic/hazardous materials, such as metal ions like copper ions, mercury ions, and picric acid. We believe that present review article may benefit the researchers working on the preparation of MOFs-based catalysts for supercapacitor and electrochemical sensing applications. Full article
(This article belongs to the Special Issue Electroanalysis of Biochemistry and Material Chemistry—2nd Edition)
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