Catalysis Science & Technology
·
2020
·Vol. 10
·期 9
·2931-2947
·
IF 5.721
Yanbing Li,Guorong Wang,Yanbin Wang,Zhiliang Jin
Two photo-active materials with opposite surface potentials, NiTiO3 with a negative potential and CoAl LDH with a positive potential, have been rationally integrated into two-dimensional (2D) active plane phosphated-CoAl LDH with rich active sites and three-dimensional (3D) hollow NiTiO3 rods with more negative zeta potential. The delicate architecture can efficiently accelerate the separation and migration of photo-excited electrons, make the surface potential more negative, enhance thermodynamic H2 evolution reaction, and offer rich active planes for photo-catalytic redox reactions. Based on these highlighted photo-catalytic benefits, the optimal composite exhibits more prominent photo-catalytic hydrogen evolution performance compared with NiTiO3 or CoAl LDH materials alone under visible irradiation. In detail, the stereoscopic catalyst, constructed by phosphating CoAl LDH layers anchored on NiTiO3 hollow rods, exhibits a hydrogen evolution activity of about 594 μmol 5 h−1, which is 11.6 times and 14.8 times that of CoAl LDH (51 μmol 5 h−1) and NiTiO3 (40 μmol 5 h−1) alone, respectively. Also, the density functional theory results reveal the good conductivity, which is beneficial for charge migration in the hybrid sample. The results from the thoroughly conducted characterization studies such as TEM, SEM, XPS, XRD, UV-vis DRS, transient photocurrent, and FTIR spectroscopy have been well researched and they are in good agreement with each other.
研究领域:
材料科学
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能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenxuan Xie,Mingzhe Li,Ziyu Ling,Xiaofen Wang,Yuzhen Lv,Kepi Chen
Highly efficient and stable electrocatalysts toward hydrogen evolution reaction (HER) under large current density are essential for alkaline water splitting. Herein, an active and durable CoMoO 4 -based HER electrocatalyst is developed, with a coupling of surface phosphorization and polypyrrole (PPy) modification to accelerate water dissociation and prevent alkaline corrosion during HER process, ensuring great catalyst stability. The prepared PPy-CoMoO 4 /P@NF catalyst achieves perfect HER activity with only 242.1 mV overpotential at the industrial current density of 1000 mA·cm −2 in 1.0 M KOH as well as a low Tafel slope of 39.0 mV dec −1 . Moreover, PPy modification greatly inhibits the alkaline corrosion and the catalyst exhibits stable operation for 100 h at 1000 mA·cm −2 with a conservation rate of 98.5 %. Electrochemical tests and theoretical calculations reveal that the multiple interfaces formed by CoMoO 4 /CoP/PPy significantly reduce the energy barrier of hydrolysis and improve the interfacial adsorption of H ads . Meanwhile, the surface phosphating changes the Gibbs free energy of rate-determining step (RDS) from −0.54 to −0.29 eV, optimizing the energy barriers for hydrogen adsorption-desorption. Remarkably, an electrolyzer with PPy-CoMoO 4 /P @NF as cathode catalyst only needs a cell voltage of 1.92 V at 1000 mA cm −2 for overall water splitting. This study provides an effective way to develop highly efficient and stable HER catalysts toward industrial water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 17
·10733-10748
·
IF 5.7
Zhang Jing-Fang,Tang Ren-Cheng
Reducing the flammability of kapok fiber (KF) is an important strategy to increase its applicability. In this work, the phosphorylation of KF with ammonium dihydrogen phosphate (ADP) was used to reduce its flammability, the conditions of phosphorylation reaction were studied in detail, and the chemical groups, crystalline structure, thermal stability, heat release capability, flammability and charring ability of phosphorylated KF were analyzed. KF showed significantly higher phosphorylation level than cotton, and its phosphorylation greatly depended on ADP and urea dosage, reaction temperature and time, and pH. Urea addition, pH 6, 150 ℃ and 1 h rendered high phosphorylation with acceptable whiteness. Phosphorylated KF exhibited good char-forming, low heat release and excellent flame retardant performances during thermal degradation and combustion as evidenced by thermogravimetric, microcalorimetric, vertical combustion and combustion residue morphology analyses. The residue rate of phosphorylated KF subjected to thermal degradation exceeded 50% in nitrogen, and 25% in air. This investigation demonstrates that phosphorylated KF is an intrinsically flame retardant material. Graphic abstract
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 45
·27235-27241
·
IF 3.119
Jiaqi Niu,Jian Yang,Ali Imran Channa,Eric Ashalley,Jiachao Yang,Jie Jiang,Handong Li,Haining Ji,Xiaobin Niu
Hydrogen is the most promising renewable energy source to replace traditional fossil fuels for its ultrahigh energy density, abundance and environmental friendliness. Generating hydrogen by water splitting with highly efficient electrocatalysts is a feasible route to meet current and future energy demand. Herein, the effects of Ru doping and phosphorization treatment on Co3O4 nanoarrays for water splitting are systemically investigated. The results show that a small amount of phosphorus can accelerate hydrogen evolution reaction (HER) and the trace of Ru dopant can significantly enhance the catalytic activities for HER and oxygen evolution reaction (OER). Ru-doped cobalt phosphorous oxide/nickel foam (CoRuPO/NF) nanoarrays exhibit highly efficient catalytic performance with an overpotential of 26 mV at 10 mA cm−2 for HER and 342 mV at 50 mA cm−2 for OER in 1 M KOH solution, indicating superior water splitting performance. Furthermore, the CoRuPO/NF also exhibits eminent and durable activities for alkaline seawater electrolysis. This work significantly advances the development of seawater splitting for hydrogen generation.
研究领域:
能源材料
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Shaoyang Zhang,Guangwei She,Shengyang Li,Fangmu Qu,Lixuan Mu,Wensheng Shi
The surface structures of the electrocatalyst have great influence on its catalytic activity. In this study, the surface structures of NiMoO 4 particles were altered through a post-phosphorization treatment to enhance the electrocatalytic activity of NiMoO 4 for oxygen evolution reaction (OER). After the post-phosphorization treatment, an amorphous layer containing a large number of electrocatalytic active sites such as the phosphate, Ni P bonds as well as the oxygen vacancies was formed on the surface of crystalline NiMoO 4 particles. As a result, the electrocatalytic activity of the phosphorized NiMoO 4 for OER was significantly improved.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guangqin Gong,Jieshu Zhou,Xiulan Guo,Ruiyan Xie,Xiangke Zeng,Min Zhang,Kangni Wen,Tianding Hu,Shaoyun Shan,Kaili Yao
The development of efficient electrocatalysts for oxygen evolution (OER) is very important for the practical application of water decomposition technology. Promoting the formation of high-oxidation-state transition metal species in a hydroxide catalyst may improve its catalytic activity in the oxygen evolution reaction, which remains difficult to achieve with current synthetic strategies. Herein, we reported the synthesis of Fe x Mn y-x nanosheets on nickel foam substrate subsequently by phosphating treatment (Fe x Mn y-x P/NF). The Mn-mediated and phosphating synergistic promoting the formation of high-oxidation-state Ni and/or Fe for improved oxygen evolution activity. In-situ Raman spectroscopy showed that the incorporation of Mn and P into the NiFe hydroxide caused a cathodic shift of the NiFe hydroxide (2 + ) to NiFeOOH (3 + δ) transition potential. Density functional theory calculations suggested that an elevated oxidation state for NiFe by Mn-mediated decreased the energy barriers of the rate-determining step (*OH → *O). As a result, an overpotential of 208 mV was achieved at a current density of 10 mA cm −2 in 1 M KOH. This work provides a new strategy and a deep insight into the construction of efficient NiFe-based water oxidation electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yujuan Cao,Ning Wu,Cuiliu Li,Yuan Chen,Hao Zhang,Hao Guo,Wu Yang
Bimetallic metal-organic frameworks (MOFs) with a controlled morphology are potential materials for boosting the electrochemical performance of supercapacitors owing to their unique structural merits. Herein, a solvent-regulated strategy was proposed to synthesize bimetallic MOFs with various morphologies, such as microflowers, microspheres , and nanosheets , and the possible mechanisms of morphology control during nucleation and crystal growth were analyzed. When employed as electrode materials for supercapacitors, the NiCo-MOF microflowers possessed the biggest specific capacitance, which could achieve 1086 F g −1 at a current density of 1 A g −1 . To further improve the electrochemical performance of materials, NiCo-P was prepared via a low-temperature phosphating method using NiCo-MOF microflowers as the precursor. Electrochemical studies displayed that the NiCo-P(6) microflowers exhibited good capacitance and superior rate capability with specific capacitances of 1592 and 1384 F g −1 at 1 and 20 A g −1 , respectively. Furthermore, an asymmetric supercapacitor assembled by NiCo-P(6) and active carbon exhibited a high energy density of 51.2 Wh kg −1 at a power density of 749.8 W kg −1 and outstanding cycling stability. This work is easy to operate and can be extended to the preparation of other MOF-based electrode materials. The delivered excellent electrochemical performance suggests the resulted flower-like NiCo-P is a promising electrode material for advanced energy storage devices.
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
·
2020
·
IF 7.489
Guorong Wang,Zhiliang Jin,Weixin Zhang
Improving conductivity of electron and ion was considered to be the significant tendency on pseudocapacitive materials. In this work, a flower-like P-NiAl LDHs electrode materials have been successfully fabricated by hydrothermal synthesis and subsequent phosphatized treatment. Owing to the presence of phosphide, the resulting P-NiAl LDHs electrode showed a high specific capacitance of 2159F g −1 at 1 A g −1 and a good capacitance retention of 85.6% at 20 A g −1 , which more excellent than NiAl LDHs electrode. Besides, the P-NiAl LDHs//AC asymmetric supercapacitor exhibited a high energy density of 79.3 Wh kg −1 under a power density of 1033.6 W kg −1 and an acceptable stability of 73.6% specific capacitance retention after 2400 charge-discharge cycles. Consequently, the P-NiAl LDHs nanoflower is one of the better candidates for assembling supercapacitor, and this phosphatized method is a kind of facile and desirable strategies to improve the electrochemical characteristics of LDH-based supercapacitor materials .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Jiang Liao,Ao Ju,Wenhao Jiang,Yan Ju,Xueliang Liu,Nianxiang Hu,Ruidong Xu,Junli Wang
Transition metal hydroxides, due to their low cost and high theoretical capacity, are promising candidates for supercapacitors . However, the lower conductivity of hydroxides usually results in devices exhibiting poor specific capacity. Here, Ni(OH) 2 @Ni 12 P 5 electrodes are designed and prepared, showing great potential for applications. This composite electrode, prepared by simple phosphating treatment and electrodeposition . Compared with the Ni(OH) 2 prepared by direct deposition, this rationally designed electrode exhibits more excellent electrochemical properties. The prepared Ni(OH) 2 @Ni 12 P 5 electrode exhibits a good area specific capacitance of 15.89 F•cm −2 at a current density of 10 mA•cm −2 , which is 2.93 times higher than that of the Ni(OH) 2 electrode (5.43 F•cm −2 ). In addition, the assembled Ni(OH) 2 @Ni 12 P 5 //AC asymmetric supercapacitor exhibits an energy density of 0.38 mWh•cm −2 at a power density of 8.00 mW•cm −2 . Therefore, this work provides a new strategy for the synthesis of high-performance supercapacitor electrodes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Peiyun Shu,Zhe He,Gentian Yue,Yueyue Gao,Jinghao Huo,Chen Dong,Furui Tan
The application of zeolite imidazole salt metal organic frameworks (ZIFs) and layered double hydroxides (LDHs) as bimetallic materials for supercapacitor electrodes is extensive, however, their inherent limitations hinder broader usage in supercapacitors. In this work, we developed a ZnNi-ZIF/LDH composite with a honeycomb structure through a sequential process involving ion doping and hydrolysis, utilizing ZIF-8 as a template to achieve a nanoscale honeycomb architecture. Subsequent phosphorization treatment yielded ZnNi-ZIF/LDH@P composite, further improving its conductivity. This process significantly enhanced the capacitive performance and stability of the composite electrode. The ZnNi-ZIF/LDH@P composite electrode revealed an excellent specific capacitance of 2855 F·g −1 at a current density of 2 A·g −1 , maintaining an impressive 93.4 % capacitance retention after 6000 charge-discharge cycles at a current density of 15 A·g −1 . The assembled ZnNi-ZIF/LDH@P//AC asymmetric supercapacitor was capable of powering a HENU light panel for at least 2 min, and its specific capacitance remained 96.4 % of the initial value after 4000 cycles at a current density of 5 A·g −1 . Overall, the ZnNi-ZIF/LDH@P composite demonstrates outstanding capacitance performance, highlighting its great potential in the field of energy storage.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Liqiang Yang,Liang Li
Graphical Atomic-level La-modulated NiFeP composites were prepared via a facile co-precipitation route followed by in situ phosphatization of La-doped NiFe-LDH precursors. Benefiting from the optimized electronic structure, the composite diver overall water splitting at 10 mA cm −2 with a low cell voltage of 1.59 V and retains performance for over 24 hours. Rare-earth La-modulated NiFeP composites were prepared via a facile co-precipitation route followed by in situ phosphatization of La-doped NiFe-LDH precursors. Benefiting from the optimized electronic structure, the La0.3-NiFeP catalyst demonstrates remarkable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. In 1 M KOH, this catalyst delivers 10 mA cm −2 at overpotentials of only 97 mV (HER) and 271 mV (OER), while demonstrating excellent operational durability. When configured as a dual-electrode water electrolyzer, La0.3-NiFeP divers overall water splitting at 10 mA cm −2 with a low cell voltage of 1.59 V and retains performance for over 24 hours, surpassing most reported transition metal-based electrocatalysts.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 3
·e202101482
·
IF 4.782
Hao Cui,Min Jiang,Gang Tan,Jianping Xie,Pengfei Tan,Jun Pan
Graphical Ru-CoP/CC electrocatalyst for hydrogen evolution was synthesized through simple in-situ hydrothermal and gas phosphatized treatments, which only needs 44 mV to reach 10 mA cm −2 , exceeding many reported electrocatalysts. Meanwhile, the reason and the result of electrons redistribution after Ru doping were deeply investigated. Exploring highly efficient, durable and low-cost catalysts for hydrogen evolution reaction (HER) is crucial to promoting the development of electrochemical water splitting systems but remains challenging. In this work, the Ru-modified CoP nanoflakes on carbon clothes (Ru-CoP/CC) are fabricated via an in-situ hydrothermal method, followed by low-temperature phosphatized treatments. According to X-ray photoelectron spectroscopy (XPS) measurements, the Ru doping induces the electron deviation from Ru to Co−P, and makes Co ions be an electron-rich state. It is revealed that the introduction of Ru can effectually reconstruct the electron coordination environment of Co−P. The resultant Ru-CoP/CC catalyst shows outstanding HER performance with an ultralow overpotential of 45 mV at 10 mA cm −2 . Moreover, the obtained catalyst exhibits long-term durability at 20 mA cm −2 for 20 h in the alkaline solution. This work opens a new avenue to lower the usage of noble metal in electrocatalyst and helps to developing a high-performance electrocatalyst for HER.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 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）