JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Le Yang,Na Wang,Bairui Tao,Fengjuan Miao,Yu Zang,Paul K. Chu
Palladium (Pd) nanoparticles in combination with naturally abundant materials are stable and highly active catalysts for hydrogen production . Herein, Co(OH) 2 nanosheet arrays are prepared hydrothermally on graphene/nickel foam (graphene/NF) to produce Co(OH) 2 /graphene/NF which provides the desirable three-dimensional (3D) substrate for subsequent Pd electrodeposition to obtain Pd/Co(OH) 2 /graphene/NF. The materials exhibit excellent durability and catalytic performance in the hydrogen evolution reaction (HER) in an alkaline environment such as a low overpotential of 124 mV at 10 mA cm −2 and Tafel slop of 53 mVdec −1 . The excellent performance is attributed to the synergistic catalytic effects rendered by the nanostructured interfaces between the Pd nanoparticles and Co(OH) 2 nanosheet arrays as well as large surface area . The technique and materials have large potential in energy conversion applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Linkun Liang,Xueping Zheng,Yifang Yao,Shenglin Liu,Jianzhong Wang,Wenshuai Liu,Chunxu Hu,Yuxuan He
In the context of hydrogen energy development, hydrogen production technology based on the hydrolysis of sodium borohydride (NaBH 4 ) has attracted considerable attention owing to its mild reaction conditions and the high-purity hydrogen generation. Nevertheless, the intrinsically sluggish hydrolysis kinetics of NaBH 4 require the development of non-noble metal catalysts that simultaneously achieve high catalytic activity and excellent durability. In this work, a molybdenum-doped cobalt hydroxide (MoO 2 -Co(OH) 2 ) catalyst was fabricated via a homogeneous urea precipitation approach, and its catalytic performance for H 2 generation from NaBH 4 hydrolysis was systematically evaluated. Concurrently, SEM, TEM, and XPS characterizations collectively elucidated the reaction pathway and electronic modulation mechanism involving Mo-doping-induced Co 2+ oxidation and oxygen vacancy generation. Additionally, this study demonstrates that the composite material possesses favorable surface hydrophilicity and exceptional synergistic catalytic activity. Through systematic modulation of the Mo/Co molar ratio, the MoO 2 -Co(OH) 2 catalyst achieved an exceptional hydrogen generation rate (HGR) of 9831.46 mL·min −1 ·g −1 at ambient temperature, concomitant with a markedly reduced activation energy (38.81 kJ·mol −1 ) relative to pristine Co(OH) 2 (68.97 kJ·mol −1 ). Furthermore, the catalytic performance of this system is comparable to, or even superior to, that of state-of-the-art Co-based catalysts. The superior catalytic performance was ascribed to the synergistic contributions of abundant defect sites afforded by the amorphous architecture, the intrinsically enhanced activity stemming from the electronic structure modulation, and the enhanced stability endowed by the compact microstructure.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxiang Li,Xi Chen,Lei Zhang,Ruishan Han,Iftikhar Hussain,Xiaoxia Ma,Kaili Zhang
Metastable intermolecular composites (MICs) composed by solid fuel and oxidizer can undergo violent redox reaction with release of huge amount of energy. Integration of MIC with microelectromechanical-system (MEMS) is of particular interest to meet the demand of miniaturization in modern pyrotechnic devices. Meanwhile, fluorine-containing oxidizers are favored in MIC owing to their potential to fluorinate the oxide passivation layer in common elemental fuels. Herein, Co(OH)F was employed for the first time as a novel fluorine-containing oxidizer in Al-based MIC. Vertically aligned Co(OH)F@Al nanobelt arrays (NAs) with tunable morphology were successfully fabricated on a variety of substrates (Si, glass, Ni, Cu, Ti) via a facile hydrothermal synthesis followed by electron beam evaporation. The whole fabrication process is highly compatible with modern MEMS technology. The thermal behavior of pure Co(OH)F and Co(OH)F@Al composites was comprehensively investigated by TG-DSC and a series of ex-situ and in-situ characterization. It was found that, Co(OH)F@Al composites achieved main exothermal reaction before melting of Al regardless of morphology and equivalence ratio. This feature is attributed to the etching of Al 2 O 3 shell by HF released from Co(OH)F which is termed as pre-ignition reaction. To elucidate the effect of micro-structure on the actual specific heat release, we proposed a phenomenological model which can be a reference for future micro-structure design of MIC.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhe Li,Chun-yong Zhang,Hao-yu Wang,Lin Zhu,Hai-tao Liu,Li Shu,Ying-pin Weng
Herein, a simple hydrothermal method was used to synthesize cobalt hydroxide/nickel sulfide and cobalt foam (Co(OH) 2 /NiS@CF) composite electrode. By simply heating cobalt foam in the aqueous solution containing cobalt nitrate, nickel nitrate, and thiourea, Co(OH) 2 /NiS nano stereoscopic website was synthesized on Cobalt foam. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and electrochemical tests were used to characterize these composite electrodes. When the molar ratio of Co(NO 3 ) 2 ·6H 2 O to Thiourea of 4:5, Co(OH) 2 /NiS@CF exhibits excellent performance under these tests. The specific capacitance was 1260 F/g at 1.0 A/g. The composite electrode had 92.3% capacitance retention after 2000 charge-discharge cycles at 1.0 A/g.
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Small
·
2023
·Vol. 19
·期 20
·2207569
·
IF 13.3
Yakun Tian,Ming Wen,Aijian Huang,Qingsheng Wu,Zhiguo Wang,Quanjing Zhu,Tao Zhou,Yongqing Fu
High stability and efficiency of electrocatalysts are crucial for hydrogen evolution reaction (HER) toward water splitting in an alkaline media. Herein, a novel nano-Pt/Nb-doped Co(OH) 2 (Pt/Nb Co(OH) 2 ) nanosheet is designed and synthesized using water-bath treatment and solvothermal reduction approaches. With nano-Pt uniformly anchored onto Nb Co(OH) 2 nanosheet, the synthesized Pt/Nb Co(OH) 2 shows outstanding electrocatalytic performances for alkaline HER, achieving a high stability for at least 33 h, a high mass activity of 0.65 mA µg −1 Pt, and a good catalytic activity with a low overpotential of 112 mV at 10 mA cm −2 . Both experimental and theoretical results prove that Nb-doping significantly optimizes the hydrogen adsorption free energy to accelerate the Heyrovsky step for HER, and boosts the adsorption of H 2 O, which further enhances the water activation. This study provides a new design methodology for the Nb-doped electrocatalysts in an alkaline HER field by facile and green way.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yunqing Pi,Peng Zhao,Lingjia Ma,Yangdan Cao,Huiqing Gao,Shuying Dong,Jianhui Sun
The Co(OH) 2 /reduced graphene oxide hybrids (Co(OH) 2 /rGO) was prepared and used as catalyst to enhanced heterogeneous activation of Oxone for the decomposition of Levofloxacin (LVF). The Co(OH) 2 /rGO composites with different Co(OH) 2 loading have been successfully synthesized, where the sample contain 20% Co(OH) 2 exhibited superior activation, attributing to the synergistic effect between Co(OH) 2 and rGO. Meanwhile, the effects of some important reaction parameters on the decomposition of LVF by Co(OH) 2 /rGO/Oxone process were investigated. The results indicated that the decomposition rate of LVF(>94.5%) was increased with the increasing of Oxone concentration, and 20% Co(OH) 2 /rGO dosage neutral pH. Moreover, the Co(OH) 2 /rGO catalyst showed high activity and stability during the repeated experiments.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chunyan Fan,Xuxin Song,Yao Tang,Zehao Zang,Yangyang Ren,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Designing catalysts that simultaneously optimize both hydrogen and oxygen evolution reaction (HER and OER) emerges as a critical materials challenge. Co(OH)₂ is recognized as an effective OER electrocatalyst, but the low HER activity limits its application in overall water splitting. In this work, we synthesized sulfur (S) and selenium (Se) doped Co(OH) 2 catalysts with significantly enhanced HER activity using an electrochemical deposition method. The S-Co(OH) 2 and Se-Co(OH) 2 catalysts own low HER overpotentials of 48 mV and 59 mV at 10 mA cm −2 . And they require 1.56 V and 1.64 V at the same current density for water splitting, the sustain stable performance for > 100 h at current densities (100 mA cm −2 ) show their practical durability. Density Functional Theory (DFT) calculations and experimental results reveal that non-metal doping induces electronic reconfiguration of Co and optimizes the ΔG H* value for intermediate formation, thus accelerating hydrogen generation and enhancing the intrinsic HER activity. This work presents an effective strategy for incorporating non-metal elements into transition metal-based catalysts, and provides insight to boost HER intrinsic activity and achieve bifunctional catalytic performance for water splitting.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Anquan Zhu,Heng Liu,Lulu Qiao,Bin Liu,Kunlun Liu,Chuhao Luan,Kai Liu,Yin Zhou,Dewu Lin,Guoqiang Gan,Jiapei Li,Guo Hong,Wenjun Zhang
The electrochemical nitrate reduction reaction (eNO 3 RR) is widely recognized as a promising strategy for sustainable ammonia production and supporting the nitrogen cycle. However, its advancement is impeded by complex behavior of reaction intermediates and the inevitable reconstruction of precatalysts. To address these challenges, the generation and utilization of active hydrogen (*H) are strategically managed by tailoring the RuO 2 /Co 3 O 4 precatalyst and optimizing the electrolyte composition (OH − and NO 3 − concentration), thereby selectively enhancing ammonia formation. Consequently, the in situ reconstructed RuO 2 /Co(OH) 2 catalyst achieves an impressive ammonia yield of 35.9 ± 0.9 mg h −1 cm −2 and a Faradaic efficiency (FE) of 98.1 ± 2.6% at −0.3 V versus RHE. Furthermore, the catalyst shows significant potential for applications in nitrate-rich wastewater treatment and rechargeable Zn-NO 3 − batteries, maintaining stable operation for over 260 hours at 1 mA cm −2 with only a 6 mV increase in the potential window. Mechanistic studies reveal that electron-rich RuO 2 facilitates *H generation through water dissociation, which subsequently migrates to Co(OH) 2 to hydrogenate nitrogenous intermediates, selectively producing ammonia. This study highlights the importance of designing efficient catalytic systems that address both precatalyst reconstruction and the complexities of reactant and intermediate conversion in electrolytes, which are essential for managing the intricate electron and proton transfer processes involved in eNO 3 RR.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13941-13947
·
IF 2.478
Liu Ying,Cao Bo,Zhang Xu,Luo Rong,Luo Chunhua,Lin Hechun,Peng Hui
Layered Co(OH) 2 has been regarded as a potential candidate for pseudocapacitor electrode material, but it is limited by its poor conductivity and low surface area. Herein, carbonated multi-walled carbon nanotubes (MWCNTs-COOH) were used to improve the conductivity of α-Co(OH) 2 nanocomposites. α-Co(OH) 2 nanoflowers were successfully grown and tangled with MWCNTs-COOH to form a randomly oriented network structure mediated by ammonia using water-methanol as co-solvent at room temperature. The capacitance performances of the obtained α-Co(OH) 2 @MWCNT-COOH composites were investigated to find that MWCNT-COOH improved the specific capacitance efficiently. Especially, in the presence of 20% in mole of MWCNT-COOH, the composite gave rise to the high specific capacitance of 1027 F/g at the current density of 2 A/g with good cycle stability, whose specific capacitance remained 78% of its original even after 5000 cycles at 30 A/g current. The large surface area and strengthening the conductivity of the composites lead to the improvement of efficiency in charge/discharge process.
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SURFACE REVIEW AND LETTERS
·
2020
·
IF 0.835
PENGHUI CAO,YUHUA YAN,XINLI TIAN,RUIZHUO OUYANG,YUQING MIAO
Oxygen evolution reaction (OER) is of great importance in splitting water. However, the sluggish OER kinetics at the anode severely hinders the H 2 evolution at the cathode which is a crucial procedure for energy storage. Herein, we report the synthesis of a new OER catalyst of Co(OH) x (WO 4 ) y via a one-step hydrothermal method, where the incorporation of WO 4 2 − as a condenser greatly enhanced the electrocatalytic activity of Co(OH) 2 toward OER. Moreover, the introduction of mesoporous carbon (MC) further improves the electrocatalytic performance of Co(OH) x (WO 4 ) y by forming the nanocomposites of Co(OH) x (WO 4 ) y /MC. The synergism between Co(OH) 2 and WO 4 2 − and the synergistic catalytic effect of Co(OH) x (WO 4 ) y and MC majorly contributed to the apparently enhanced electrocatalysis of Co(OH) x (WO 4 ) y /MC toward OER. This work provides an efficient strategy to improve the electrocatalytic activity of Co(OH) 2 by introducing WO 4 2 − and forming nanocomposites between Co(OH) x (WO 4 ) y and MC for low-cost, convenient and highly efficient water oxidation.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 22
·8832-8839
·
IF 4.569
Yihao Gao,Jie Bai,Tianning Zhou,Yaqiong Gong
In recent years, Co-based metal–organic frameworks (Co-MOFs) have received significant research interest because of their large specific surface area, high porosity, tunable structure and topological flexibility. However, their comparatively weak electrical conductivity and inferior stability drastically restrict the application of Co-MOFs in the synthesis of electrocatalysts. In this study, ZIF-67 was grown on nickel foam by a room temperature soaking method, and then Ir–Co(OH)2@ZIF-67/NF was assembled by a hydrothermal method. The prepared Ir–Co(OH)2@ZIF-67/NF nanosheets exhibit remarkable conductivity, larger electrochemical active surface area and wider electron transport channels. Only ultralow overpotentials of 198 mV, 263 mV, and 300 mV were needed for Ir–Co(OH)2@ZIF-67/NF to reach the current densities of 10 mA cm−2, 50 mA cm−2, 100 mA cm−2, meanwhile, no obvious degradation of the current density at 10 mA cm−2 was observed for about 16 h. This work may provide a promising strategy for developing high-performance MOF-derived materials as electrocatalysts for the OER under alkaline conditions.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·16705-16713
·
IF 3.591
Xue Meng,Li Yan,Maobin Wei,Tao Wang,Ting Xu,Yongsheng Yan,Shihan Cheng
The developed peroxydisulfate (PDS) activation for removing pollutants is a significant technology. Here, a Co(OH)2/Cu2O composite was synthesized and used to activate PDS for tetracycline (TC) degradation. Covering the surface of Cu2O with Co(OH)2 could improve the stability of the material, reactive active sites, and electron transfer efficiency of the catalyst. Thus, Co(OH)2/Cu2O composite exhibited excellent performance in terms of degrading the TC pollutant, and in the Co(OH)2/Cu2O/PDS system, the removal rate of TC could reach 98% within 30 min. Moreover, the effect of pH value, PDS dosage, and TC concentration on the degradation efficiency of TC was systematically studied. According to free radical quenching experiments, the possible mechanism of TC degradation over the Co(OH)2/Cu2O/PDS system was proposed. This work provided a research basis for the use of metal oxides for PDS activation in environmental treatment.
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