Nanomaterials
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2022
·Vol. 12
·期 22
·3972
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IF 5.719
Xue-Zhi Song,Yu-Hang Zhao,Fan Zhang,Jing-Chang Ni,Zhou Zhang,Zhenquan Tan,Xiao-Feng Wang,Yanqiang Li
The oxygen evolution reaction (OER) is kinetically sluggish due to the limitation of the four-electron transfer pathway, so it is imperative to explore advanced catalysts with a superior structure and catalytic output under facile synthetic conditions. In the present work, an easily accessible strategy was proposed to implement the plant-polyphenol-involved coordination assembly on Co(OH)2nanosheets. A TA-Fe (TA = tannic acid) coordination assembly growing on Co(OH)2resulted in the heterostructure of Co(OH)2@TA-Fe as an electrocatalyst for OER. It could significantly decrease the overpotential to 297 mV at a current density of 10 mA cm−2. The heterostructure Co(OH)2@TA-Fe also possessed favorable reaction kinetics with a low Tafel slope of 64.8 mV dec−1and facilitated a charge-transfer ability. The enhanced electrocatalytic performance was further unraveled to be related to the confined growth of the coordination assembly on Co(OH)2to expose more active sites, the modulated surface properties and their synergistic effect. This study demonstrated a simple and feasible strategy to utilize inexpensive biomass-derived substances as novel modifiers to enhance the performance of energy-conversion electrocatalysis.Keywords:Co(OH)2;tannic acid;electrocatalyst;OER;coordination assembly
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Zhihui Wei,Jie Li,Lixia Yang,Siyu Liu,Haicheng Li,Mingxia Lu,Tiantian Ying,Yan Luo,Kexin Li,Zhenglin Chen,Xiuping Zhang,Shenglian Luo
Degradation of halogenated organic compounds using the electro-reduction process is a promising approach for advanced water treatment. In this work, antiferromagnetic Co 3 O 4 nanoparticles were first loaded on a uniform anodic porous TiO 2 surface through a hydrothermal strategy, then subjected to an electrochemical reduction, which transform from nanoparticle-shape to interconnected nanoflakes. Compared with the pristine Co 3 O 4 nanoparticles, the morphologically transformed Co 3 O 4 cathode features a porous interface with amorphous Co(OH) 2 and CoOOH shell, which favors the generation of abundant •OH radicals along with lower overpotential for reducing H + to H*. On account of the plentiful radicals and self-supporting nature, the resulting Co 3 O 4 cathode retains high activity for efficiently degrading Thiamphenicol in water, even after 10 h run, demonstrating remarkable durability. Moreover, it is adaptable in a wide pH window of 3 to 10, and effectual when the initial Thiamphenicol concentration increases from 0.5 to 50 mg/L regardless of the water background (tap water, lake water, or river water). This study delivers a profound cognition about the dynamic behaviors of Co 3 O 4 -based electrocatalysts applied in eliminating halogenated antibiotics.
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ChemElectroChem
·
2022
·Vol. 9
·期 2
·e202101523
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IF 4.782
Junye Zhang,Hao Guo,Fan Yang,Mingyue Wang,Tingting Zhang,Hao Zhang,Wu Yang
Graphical Ni-MOF derived CMs@Ni(OH) 2 /NiSe with a core-shell structure was designed. The obtained core-shell nanostructure material possesses a high contact area, excellent synergistic effect and can provide more reactive active sites. The application of Ni-MOF in supercapacitors has received widespread attention, but its poor conductivity and bad stability hinder its application. Therefore, Ni-MOF derived CMs@Ni(OH) 2 /NiSe with a core-shell structure was designed. Here, carbon microspheres (CMs) were explored as the conductive substrate to enhance the stability and in situ prepared Ni-MOF was anchored on the surface of CMs. Then, alkali-treatment and selenylation were carried out on CMs@Ni−MOF to improve stability and conductivity. The obtained core-shell nanostructure material possesses a high contact area, excellent synergistic effect and can provide more reactive active sites. The prepared CMs@Ni(OH) 2 /NiSe shows a higher specific capacitance (2106 F g −1 ) and excellent cycling performance with a capacitance retention of 95 % after 30000 cycles. Furthermore, the assembled CMs@Ni(OH) 2 /NiSe//AC device delivers a high energy density of 70.84 Wh kg −1 at the power density of 756.8 W kg −1 and maintains 100 % of the initial capacitance after 40000 cycles.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yanjun Yu,Chen Chen,Yiheng Liu,Hongliang Yu,Shuaijie Li,Yanan Xue,Ning Cai,Jianzhi Wang,Faquan Yu
Developing efficient and cost-effective bifunctional catalytic electrodes is of great importance to water splitting. In this study, hybrid Ni/Ni(OH)2-coated NiCo2O4 nanorods were grown on Ni foam (NF) by a facile growth–conversion–epitaxy approach. The epitaxial decoration of Ni/Ni(OH)2 composite could increase the intrinsic activity of NiCo2O4/NF and enhance the charge-transfer rate. This self-standing hierarchical nanohybrid with unique surface chemistry and interface engineering exhibits an excellent electrocatalytic performance. The optimized Ni/Ni(OH)2-NiCo2O4/NF only requires overpotentials of 53 and 235 mV to reach a current density of 10 mA cm–2 for HER and OER, respectively. The electrolyzer achieved 10 mA cm–2 at a low cell voltage of 1.51 V for water splitting. This work offers a new perspective for rationally designing electrocatalytic materials by surface decoration.
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Small
·
2022
·Vol. 18
·期 23
·2200548
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IF 15.153
Meng-Meng Pan,Yu Ouyang,Yong-Li Song,Lu-Qin Si,Ming Jiang,Xu Yu,Li Xu,Itamar Willner
The synthesis and characterization of Au 3+ -modified UiO-67 metal-organic framework nanoparticles, Au 3+ -NMOFs, are described. The Au 3+ -NMOFs reveal dual oxidase-like and peroxidase-like activities and act as an active catalyst for the catalyzed generation of O 2 •− under aerobic conditions or •OH in the presence of H 2 O 2 . The two reactive oxygen species (ROS) agents O 2 •− and •OH are cooperatively formed by Au 3+ -NMOFs under aerobic conditions, and in the presence of H 2 O 2. The Au 3+ -NMOFs are applied as an effective catalyst for the generation ROS agents for antibacterial and wound healing applications. Effective antibacterial cell death and inhibition of cell proliferation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E . coli ) bacterial colonies are demonstrated in the presence of the Au 3+ -NMOFs. In addition, in vivo experiments demonstrate effective wound healing of mice wounds infected by S. aureus , treated by the Au 3+ -NMOFs.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Fangke Yu,Yang Yang,Yanfang Zhang,Yuwei Pan,Ying Zhang
The present study describes the coating of modified graphite felt (GF) with graphene (GE) and polyaniline (PANI). GF was doped with nitrogen atoms by a series of modification and electrolytic deposition . Tests of different types of N content and cathodic catalytic oxidation performance confirmed that the graphite N introduction promoted the production of H 2 O 2 in the 2e - process. Pyridine N catalyzed the H 2 O 2 decomposition to produce •OH. The amount of H 2 O 2 produced by GF, GF-GE, and GF-GE@PANI system was 11 mg L -1 , 70 mg L -1 , and 180 mg L -1 , respectively. The doping of graphene increased H 2 O 2 yield, and the electrolytic deposition of PANI converted H 2 O 2 to •OH rapidly. It was proved that the N atom provided by graphene was graphite N, which was the active catalytic site for the production of H 2 O 2 . The perfluorooctanoic acid (PFOA) removal at 180 min was 24.1% and 49.8% in the GF and GF-GE systems, respectively. The GF-GE@PANI system achieved 100% PFOA removal within 160 min. It was demonstrated that the enrichment of PANI with pyridine N provided many active sites for improving the conversion of H 2 O 2 to •OH and in-situ degrading organic pollutants , offering an alternative for wastewater treatment .
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 2
·219-223
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IF 2.726
Xiao Long,Wu Huirong,Zhang Yong,Sun Hao,Zhang Wenchao,Lyu Fenglei,Deng Zhao,Peng Yang
O xygen evolution reaction(OER) plays a key role in the electrochemical conversion and storage processes, but the sluggish kinetics of OER strongly impedes its large-scale applications. We herein reported the in situ growth of Fe-benzenedicarboxylate(Fe-BDC) on Co(OH) 2 nanoplates[Fe-BDC/Co(OH) 2 ] that showed remarkably enhanced OER activity than the pristine Co(OH) 2 . The incorporation of Fe species could enhance the intrinsic OER activity of Co and BDC could increase the electrochemically active surface area(ECSA), thus resulting in dramatically enhanced OER activity. In situ Raman spectroscopy characterization disclosed that Fe-CoOOH reconstructed from Fe-BDC/Co(OH) 2 was the real active site for OER. This work highlights the significance of rational tailoring of the nanostructure and electronic structure of Co(OH) 2 and provides more opportunities for its widespread applications.
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NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 3
·1158-1167
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IF 3.591
Huan Fu,Huan Zhang,Guichun Yang,Jun Liu,Junyuan Xu,Peihuan Wang,Ning Zhao,Lihua Zhu,Bing Hui Chen
Catalysts of 0.54% (Pt, Rh, Pd or Ru)/Co(OH)2 and 1.23% Rh/Co(OH)2 were successfully synthesized via simple hydrothermal and precipitation methods for the selective hydrogenation of nitroarenes. It was found that 0.54% Rh/Co(OH)2 outperformed other catalysts, for example, 2-chloronitrobenzene hydrogenation (with a turnover frequency (TOF) of 575 h−1) under 3.0 MPa H2 at 100 °C for 1 h (much higher than that of 1.23% Rh/Co(OH)2; TOF, 398 h−1). Through characterization of the nanostructure (XRD, TEM, HRTEM, AC-STEM (spherical aberration-corrected scanning transmission electron microscopy), AC-STEM-EDX elemental mapping and line-scanning, H2-TPD, etc.), it was confirmed that Rh was dispersed in the form of single atoms and ultrasmall nanoclusters on Co(OH)2 for 0.54% Rh/Co(OH)2. Moreover, 0.54% Rh/Co(OH)2 also exhibited high selectivity for –NO2 hydrogenation for other selected nitroarene substrates hydrogenation reactions. This was mainly attributed to the presence of Rh as single atoms or super tiny nanoclusters in 0.54% Rh/Co(OH)2, leading to a significant increase in the number of active sites, beneficial adsorption of the –NO2-group at defect-rich Co(OH)2, and an interfacial synergy effect of Rh–Co(OH)2, thus improving the catalytic performance.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 28
·9746-9753
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IF 4.39
Yan He,Tao Yu,Hui Wen,Rui Guo
For the electrocatalytic oxygen evolution reaction (OER) in alkaline media, there is an urgent need to optimize the adsorption strength of OH*. Here, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)2 was used as an OER catalyst with a low overpotential of 291 mV at 50 mA cm−2. The results showed that faster charge transfer was achieved at the electrode/solution interface during the OER process after the FeOOH/Ni(OH)2 was modified by Cr, which facilitates the rate-determining step of the Volmer reaction. Furthermore, the results of faradaic efficiency and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the synergistic effect between the ternary metal and oxygen vacancies led to excellent OER performance. This work provides a new strategy for the preparation of high-efficiency and low-cost oxygen evolution electrocatalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Chi Zhang,Zhuohong Xie,Yi Liang,Dingding Meng,Zheng Wang,Xin He,Weiye Qiu,Mei Chen,Ping Liang,Zhonghua Zhang
Ni(OH) 2 has been long studied as an effective oxygen evolution electrocatalyst . Nevertheless, its catalytic activity can still be further enhanced by microstructural modification and Fe-doping. In this study, with the assistance of adsorbent ferrihydrite (FH), we obtain Fe-doped β-Ni(OH) 2 nanoplates with Fe 2 O 3 nanoparticles decorated on the surface via a facile hydrothermal process. The Fe-doping, decorated Fe 2 O 3 nanoparticles , and special microstructure endow β-Ni(OH) 2 nanoplates with an improved oxygen evolution activity in alkaline solutions. For the sample with optimal FH amount, the overpotential to motivate a current density of 10 mA cm −2 is 280 mV, with a low Tafel slope of ~64.17 mV dec −1 . During the 10 h i-t test at 1.50 V vs. RHE , the current density has an attenuation of only 23.7%. The study opens a facile avenue to modify Ni(OH) 2 -based OER catalyst from perspectives of both microstructures and compositions .
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Changsong Li,Yijing Li,Qiang Li,Junling Duan,Juying Hou,Qin Hou,Shiyun Ai,Houshen Li,Yuechao Yang
Phosphates and organophosphorus cause environmental pollution , and excessive phosphate leads to water eutrophication . Glyphosate , an organophosphorus herbicide, harms the environment and human health. In this study, regenerable magnetic AL/Fe 3 O 4 /La(OH) 3 adsorbents were developed by modifying Fe 3 O 4 and La(OH) 3 on aminated lignin (AL) for phosphate and glyphosate removal. The adsorption capacity for phosphate and glyphosate reached 60.36 mg g −1 and 83.87 mg g −1 when the initial concentrations were 150 mg L −1 and 250 mg L −1 , respectively. The thermodynamic data showed that adsorption is a spontaneous and endothermic process. Adsorption can be applied at pH values ranging from 3 to 11 and is more suitable under acidic conditions. Fe 3 O 4 and La(OH) 3 both enhanced the adsorption capacities of phosphate and glyphosate. Phosphate and glyphosate compete slightly when coexisting in the adsorption process at low concentrations. Due to the magnetic properties of Fe 3 O 4 , the adsorbents can be separated rapidly and effectively with an external magnetic field. 89% adsorption capacity remained after four adsorption-desorption recycles. Thus, AL/Fe 3 O 4 /La(OH) 3 shows potential for phosphate and glyphosate removal as an effective and reusable adsorbent.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Kun Song,Wenting Li,Rui Yang,Yongjie Zheng,Xiaoshuang Chen,Xin Wang,Guoli Chen,Weichao Lv
As a battery-type electrode material , Ni(OH) 2 has been widely concerned for its ultra-high theoretical specific capacity, however, its poor conductivity and lack of effective active sites hinder its application. It is a great challenge to develop Ni(OH) 2 based supercapacitors . It is critical to improve the electrical conductivity and effective active sites to make full use of the energy storage of Ni(OH) 2 -based materials. Therefore, Ni(OH) 2 /NiS composites are designed and prepared by controllable low temperature chemical deposition and ion exchange method. Ni(OH) 2 nanosheets with various morphology are controllably prepared by low temperature chemical deposition, and then Ni(OH) 2 /NiS composites are controllably prepared on Ni(OH) 2 substrate by ion exchange. Due to the doping of NiS into Ni(OH) 2 nanosheets, the conductive network structure is formed, which makes the composite exhibit excellent electrochemical properties, such as high specific capacity, large specific surface area and good electrical conductivity. The as-fabricated Ni(OH) 2 /NiS indicates an outstanding specific capacity of 240.5 mAh g −1 at 1 A g −1 . This paper detailed studies the practical application of hybrid supercapacitors , which may inspire future researchers to design Ni(OH) 2 -based materials with desired applications.
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