JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Jianmin Dai,Lingqiang Meng,Shengzhong Rong,Hongmin Gao,Ze Zhang,Yingcong Zhang,Ren Qiu,Yuanhao Wang,Dong Chang,Ping Ding,Hongzhi Pan
Multilayer graphene oxide(MGO) highly stacked nature restricts its application in the sensor field, and obtaining high-quality 3D graphene remains a significant challenge. Herein, we report the direct use of MGO to synthesize highly dispersed and rich ordered mesoporous 3D reduced graphene oxide frameworks(rGOFs) through a novel improved KOH activation method, which is based on the pre-treatment process of fully adsorbing and fixing the appropriate amount of K + by using the limited interlayer space of MGO and freeze-drying crystallization technology. Surprisingly, different from previous reports that only the micropores and individual macropores have been obtained by conventional KOH activation, we fully confirmed the dense and ordered mesoporous defects on the surface of rGOFs by SEM for the first time, as well as the multilayer stacked structure of rGOFs is in line with the typical 3D structure. Besides, rGOFs have the excellent properties of reduced graphene oxide (rGO) and a particular 3D framework structure, making it an excellent functionalized modification platform. In order to verify the performance of rGOFs as a framework platform, in which amination modification and small-size Ag NPs loading were successfully realized, the constructed Ag@rGOF-NH 2 /GCE sensor detects chloride ions over a wide linear concentration range of 5 μmol L −1 -10 μmol L −1 , with the detection limit as low as 0.1 μmol L −1 (S/N = 3). This work would not only open a new path to synthesize 3D graphene with excellent performance, and the concept of graphene frameworks nanomaterial is proposed for the first time, but also promotes its excellent performance as an ideal matrix platform for other nanomaterials in the field of electrochemical sensing.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2023
·Vol. 48
·期 2
·125-133
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IF 1.7
Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
研究领域:
材料科学
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电化学
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可再生能源
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DOI
高影响因子
Emerging Contaminants
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2026
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IF 8.2
Ziqiu Wang,Kun Yang,Chuan Wang,Guangxi Zhang
The mechanochemical technique has emerged as a promising destructive method for degrading per- and polyfluoroalkyl substances (PFAS), particularly in solid waste matrices, and potassium hydroxide (KOH) is recognized as a highly effective additive. However, the molecular-scale mechanism that underlies its exceptional defluorination performance remains obscure, which limits the rational optimization of the process. Here we combine experiments with density functional theory (DFT) calculations to resolve the reaction pathway of KOH-assisted mechanochemical defluorination of perfluorooctanoic acid (PFOA), and identify a well-defined three-step sequential mechanism: solid-phase neutralization → homolytic decarboxylation → SN2 nucleophilic substitution defluorination. Mechanical force first drives the rapid neutralization of PFOA with KOH to form PFOA-K. The C–COO - bond of PFOA-K then undergoes homolytic cleavage, a pathway distinct from conventional ionic decarboxylation, generating a highly reactive •C 7 F 15 radical and a •COO - radical without CO 2 release; this step substantially weakens the C–F bonds of the resulting radical. Finally, OH - supplied by KOH acts as a potent nucleophile that preferentially attacks the α-C site (the most electron-deficient and least sterically hindered position) via an SN2 pathway, giving efficient F - elimination. The defluorination kinetic constant of KOH (1.29 h -1 ) far exceeds those of Na 2 CO 3 and Al 2 O 3 . Beyond providing a molecular-level understanding of PFOA degradation, the elucidated "neutralization–radical formation–nucleophilic attack" sequence offers a mechanistic basis for understanding and designing the mechanochemical destruction of other perfluorocarboxylic acids. These results highlight KOH-assisted mechanochemistry as an efficient destructive route for remediating PFAS-contaminated solid wastes such as soils and spent adsorbents. Download: Download high-res image (137KB) Download: Download full-size image
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Nannan Li,Heng Chen,Tianhao Che,Hongwen Yu,Guankai Qiu
KOHC-MGs increased rhizosphere pH by 18.2% and reduced exchangeable Al 3+ and H + by > 79%. • KOHC-MGs upregulated key N-cycle genes while suppressing denitrification. • KOHC’s porous structure and functional groups enabled dual abiotic–biotic acid neutralization. • Microbial colonization drove amino-acid-mediated proton consumption and deterministic community assembly. Soil acidification severely constrains crop production by reducing nitrogen bioavailability. Although hydrochar shows promise for soil remediation, its application in acidified soils remains challenging due to its intrinsic acidity. Here, we developed an innovative strategy combining KOH-modified hydrochar (KOHC) with nitrogen-fixing microbial aggregates (MGs) and investigated its effects on rhizosphere acidification and nitrogen cycling in soybean. Pot experiments and multi-omics analyses revealed that 2% KOHC-MGs treatment significantly promoted the aggregation of rhizosphere nitrogen-fixing microbes and enhanced their metabolic functions. This treatment increased rhizosphere soil pH by 18.2%, reduced exchangeable Al 3 + and H + content by 80.5% and 79.6% respectively, while upregulated key nitrogen‑cycle genes ( nifH , hao , nxrA , nrfA ) while suppressing denitrification, resulting in 96.2% higher NH 4 + ‑N retention than the control. Mechanistically, KOHC’s porous structure and functional groups promoted microbial colonization and amino‑acid‑mediated proton consumption, while directly neutralizing acidity and immobilizing Al 3+ , establishing a dual abiotic–biotic loop that outperformed liming by concurrently mitigating acidification and enhancing nitrogen utilization, as reflected in improved plant growth and enzyme activities. Our findings demonstrate that integrated material–microbe strategies offer a sustainable alternative to conventional liming for restoring nitrogen dynamics and alleviating acidification in degraded agroecosystems, with implications for reducing fertilizer dependence and greenhouse gas emissions. Download: Download high-res image (297KB) Download: Download full-size image
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2026
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IF 9.2
Guangya Zhou,Dong Zhang,Zhengzheng Lou,Miaomiao Zhao,Dihua Wu,Suling Zhang,Ying Pan,Ting Lü,Hongting Zhao,Jun Lin,Li Lu,Ming Zhang
Porous biochar has emerged as a promising heterogeneous catalyst for the activation of persulfate (specifically peroxymonosulfate, PMS) to degrade organic contaminants, owing to its highly-developed pore structure and abundant surface functionalities. However, its catalytic efficiency is critically influenced by intrinsic structural defects and surface chemistry, yet the underlying structure–activity relationships remain elusive. Notably, the specific mechanisms governing electron transfer within non-radical pathways during PMS activation require further clarification. In this study, a series of porous biochars were synthesized from waste Myriophyllum aquaticum via KOH activation followed by pyrolysis at varying temperatures. The results demonstrate that the synergistic effect of high-temperature pyrolysis and alkali activation significantly augments structural defects and the density of oxygen-containing functional groups, thereby accelerating electron transfer and PMS activation. Among these catalysts, the PMaB-800-1/PMS system achieved complete removal of 2,4,6-trichlorophenol (2,4,6-TCP) within 15 min, exhibiting a high apparent rate constant ( k obs ) of 0.35 min −1 and an ultra-high PMS utilization efficiency of 0.53. Radical quenching experiments, electron paramagnetic resonance (EPR), and electrochemical analyses confirmed that 2,4,6-TCP degradation was predominantly driven by a non-radical oxidation pathway involving 1 O 2 , O 2 •- , and direct electron transfer. Insights from XPS, Raman spectroscopy, and density functional theory (DFT) calculations further revealed that C=O/O–C=O groups and pyridinic N served as the primary active sites for PMS activation and the selective generation of reactive oxygen species. This study not only provides a sustainable route for the upcycling of spent aquatic plants, but also offers a robust strategy for constructing efficient remediation systems for organic pollutants.
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DOI
PubMed
高影响因子
VACUUM
·
2025
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IF 3.9
Jianan Wen,Rui Liu,Zhangcai Zhou,Guoxiang Xin,Jinxiao Bao,Jianmin Gao,Yao Wang,Jinling Song
Coal gasification slags (CGSs), as by-products of the coal chemical industries, are favorable carbon precursor materials and more economical to mass-produce than biomass. In this study, coal gasification slags were utilized as carbon sources for the fabrication of activated carbon supercapacitor electrode materials. Residual carbon (RC) was first obtained by the gravity separation method from CGSs. Then, RC was then synergistically activated by KOH-KCl eutectic molten salts under the optimized conditions of 420 °C and 3 h and obtained activated carbon ACRC3. The specific surface areas (SSAs) and pore volume of the ACRC3 were 745.83 m 2 /g and 0.75 cm 3 /g, respectively. The electrochemical tests showed that the high specific capacitance of the ACRC3 was 190.0 F/g at the current density of 0.5 A/g. Symmetrical supercapacitors (ACRC3//ACRC3) exhibited 99 % capacitance retention at 0.3 A/g after undergoing 10,000 cycles. These electrochemical properties of ACRC3 were more excellent than those of the commercial activated carbon electronic materials (PEC-2, YP-50F or YP-80F). The low-temperature and simple activation of RC as high-performance supercapacitors can provide new directions for recycling CGSs.
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DOI
高影响因子
LANGMUIR
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2024
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IF 3.7
Chang Zou,Li Chen,Qingye Liu,Wei Lu,Xueyan Sun,Jun Liu,Yuan Lei,Wei Zhao,Yilun Liu
With a large theoretical capacity and high energy density, aluminum-air batteries are a promising energy storage device. However, the rigid structure and liquid electrolyte of a traditional aluminum-air battery limit its application potential in the field of flexible electronics, and the irreversible corrosion of its anode greatly reduces the battery life. To solve the above problems, a PVA/KC/KOH (2 M) composite gel polymer electrolyte (GPE) with a three-dimensional dual-network structure consisting of polyvinyl alcohol (PVA), kappa-carrageenan (KC), and potassium hydroxide was prepared in this paper by a simple two-step method and applied in aluminum-air batteries. At room temperature, the ionic conductivity of the PVA/KC/KOH (2 M) composite GPE was found to be up to 6.50 × 10–3 S cm–1. By utilizing this composite GPE, a single flexible aluminum-air battery was assembled and achieved a maximum discharge voltage of 1.2 V at 5 mA cm–2, with discharge time exceeding 3 h. Moreover, the single flexible aluminum-air battery maintains good electrochemical performance under various deformation modes, and the output voltage of the battery remains at about 99% after 300 cycles. The construction of flexible aluminum-air batteries based on a three-dimensional dual-network PVA/KC/KOH composite GPE provides excellent safety and high-multiplication capabilities for aluminum-air batteries, making them potential candidates for various flexible device applications.
研究领域:
储能
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材料科学
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电化学
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柔性电子学
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DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
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2016
·Vol. 51
·期 9
·508-512
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IF 0.908
Hai Wu,Youjin Zhang,Maozhong Zhou,Chengpeng Yao,Xianjin Ge
Large single crystals of lanthanide hydroxides [Ln(OH) 3 (Ln = La, Pr, Nd, Sm, Eu and Tb)] up to several millimeters have been grown by using solid KOH assisted hydrothermal method. Eu(OH) 3 samples, as a representative of the Ln(OH) 3 crystals, were characterized by X-ray diffraction (XRD), 4-circle single-crystal diffraction, Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). FESEM image shows hexagonal prism morphology for the Eu(OH) 3 large crystals. Research on the photoluminescence and magnetic properties of Eu(OH) 3 species was conducted.
研究领域:
材料科学
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光学
·
磁学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Suhui Lu,Yanjie Song,Kunkun Guo,Xuli Chen,Jiajing Xu,Li Zhao
The electrochemical behaviors of ordered mesoporous carbon composites after KOH activation as supercapacitors electrodes in various electrolytes, such as acidic, alkaline, neutral aqueous solutions, are thoroughly investigated by cyclic voltammetry , galvanostatic charge/discharge, cyclic life, rate ability, leakage current and electrochemical impedance spectroscopy . These results demonstrate that the structures of ordered mesoporous carbon composites, as well as hydrated ionic radius, conductivity and ionic mobility of electrolytes are relevant to their electrochemical performances. The electrochemical performances of ordered mesoporous carbon/graphene composites (OMC/G) in different electrolytes are in deeply comparison with those of ordered mesoporous carbon composites (OMC) without graphene. It is found that ordered mesoporous carbon composites attain better specific capacitance and rate ability in acidic and alkaline electrolytes than those in neutral electrolytes. However, when the operating voltage increases up to 1.7 v, OMC/G composites in neutral aqueous electrolytes can achieve the best energy density and power density up to 27.23 Wh kg −1 and 7528.5 W kg −1 , respectively.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Liying Jiang,Ke Li,Lingen Xia,Jiajun Gao,Lu Tang,Yanbo Jia
Hydrothermal carbonization (HTC) has been a promising treatment technology of heavy metal-enriched hyperaccumulator biomass to produce superior hydrochar adsorbent for contamination removal from the wastewater. However, a high amount of heavy metal in derived hydrochar limits its further application. In this study, the effect of reaction temperature (180–270 ℃) and medium pH during HTC on heavy metal contents, speciation and leaching risk of hydrochar from the hyperaccumulator biomass Sedum alfredii Hance was investigated to assess its environmental risk. HTC at a low reaction temperature and acid addition facilitated the removal of Zn/Cd/Pb from the solid phase, meanwhile the addition of acid favored the immobilization of Zn/Cd/Pb and lowered the potential leaching risk of Zn/Cd/Pb. Hydrochar prepared from HTC at 240 °C and pH = 2 had lower heavy metal content and lower releasing risk, followed by KOH modification to obtain high adsorption performance. The modified hydrohcar (KSAB) were characterized by SEM, XRD, BET, Boehm titration and FT-IR, and showed that the surface specific surface area and pore structure were optimized and OFGs of hydrochar were improved significantly after KOH treatment. Adsorption experiments showed that the Cd(II) adsorption process onto KSAB well accorded with pseudo-second-order kinetics and Langmuir isotherms. The maximum Cd(II) adsorption capacity of KSAB was 25.69 mg/g, which was 17 times compared to that of pristine hydrochar. Microstructure characteristics and mechanism analysis further suggested that electrostatic interactions, surface complexation, cation-π and ion exchange were the main Cd(II) removal mechanisms of KOH-modified hydrochar. Therefore, hydrochar derived from hyperaccumulator biomass can be used as a highly efficient absorbent to remove Cd(II) from wastewater after KOH modification.
研究领域:
环境科学
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污染治理
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材料科学
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产品关联
DOI
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Jingwei Hong,Wanli Li,Jin Shang,Hiromi Yamashita,Yun Hu
Utilizing electrocatalysis to convert CO2 into high-value industrial raw materials can not only effectively reduce CO2 emissions but also achieve a closed carbon cycle. This method holds great potential for addressing global warming and alleviating the fossil fuel crisis. Here, we report a novel electrocatalyst for CO2 reduction composed of a composite material derived from Cu-MOF74 and Cu2O, synthesized under the regulation of an appropriate amount of KOH. The research results indicate that the unique Cu0/Cu+ interface in Cu-MOF74/Cu2O-350 enhances the adsorption of reaction intermediates, providing more active sites for CO2 reduction. Additionally, the moderate carbonization during the thermal treatment process increases conductivity and enriches the electrochemical active surface area, accelerating the charge transfer rate. Consequently, this composite exhibits excellent CO2 reduction performance. At -1.3 V vs. RHE, the Faraday efficiency (FE) for C2H4 production reached up to 32.48%, which was significantly higher than that of pure Cu2O-350 (9.25%) and Cu-MOF74-350 (15.52%). Even after 6 hours of reaction, the FE for C2H4 remained above 24.52%, reflecting its good stability. Furthermore, we utilized in-situ infrared spectroscopy to study the key intermediates of the relevant reduction products, inferring the possible reaction pathways for the formation of HCOOH and C2H4. This study provides a simple synthesis method for the preparation of high-selectivity MOF-derived composite catalysts for the electrocatalytic reduction of CO2 to value-added chemicals.
研究领域:
电化学
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材料科学
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环境科学
·
催化
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产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Wei Zhao,Kai Huang,Qinghua Zhang,Hui Wu,Lin Gu,Kefu Yao,Yang Shen,Yang Shao
Oxygen reduction reaction (ORR) plays a major role in the efficient operation of many important electrochemical energy devices. Herein, a novel catalyst of nanoporous silver (NPS) is in-situ synthesized by a high voltage anodization method in 0.1 M KOH which also serves as the electrolyte for the catalysis of ORR. Favored by the continuous pore channels, the mass transfer is enhanced within the NPS. Theoretical calculations suggest that the strengthened interactions between OOH intermediates and the dominant Ag(110) surfaces on NPS as revealed by an adsorption test reduce the activation energy for the rate determining step and thus accelerate the ORR. Due to the enhanced mass transfer and facile kinetics, the NPS exhibits excellent ORR activity and even outperforms the commercial Pt/C. Fascinating more, the service life of NPS is significantly extended through an in-situ regeneration process. The integration concept we demonstrate in this work shed new lights on the preparation of long-life functional materials with high performance in applications including but not limited to ORR.
研究领域:
电化学
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材料科学
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催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）