LANGMUIR
·
2025
·
IF 3.9
Xiaoru An,Xiaonan Du,Hong Li,Fei Gao,Yue Hua,Xiuling Zhang,Jingsen Zhang,Lanbo Di
Electrochemical nitrate reduction reaction (eNO3RR) with Co-based catalysts provides a sustainable and efficient approach to wastewater purification and nitrogen recovery. However, their inevitable and uncontrollable reconstruction during the eNO3RR leads to uncertain actual active sites and a confused understanding of the mechanism. Herein, the active sites and structural evolution of α-Co(OH)2/CC during the eNO3RR process were investigated via in situ and ex situ characterizations. The results show that α-Co(OH)2 nanosheets are converted to β-Co(OH)2 in a strongly alkaline electrolyte and then act as active sites to adsorb NO3– and spontaneously react to generate CoOOH. Whereas CoOOH is swiftly reduced to β-Co(OH)2 at negative cathodic potential, realizing a nitrate-electrically mediated cyclic evolution process and synergistically catalyzing the eNO3RR. Consequently, α-Co(OH)2/CC achieves a Faradaic efficiency as high as 92% at −0.1 V vs RHE and a high NH3 yield rate of 338 mmol·gcat–1·h–1 under −0.6 V vs RHE. This work offers novel insight into the structural evolution and catalytic behavior of Co-based catalysts in eNO3RR.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaomin Peng,Jinming Zhang,Tianlun Cen,Zhifeng Ye,Yiyi Liu,Dingsheng Yuan
2-dimensional Co(OH) 2 -NiCo 2 O 4 hybrid nanosheets coupled with N-doping reduced graphene oxide (N-RGO) have been prepared by a facile two-step hydrothermal method for exploring the cost-effective and durable bifunctional oxygen electrocatalysts of Zn-air batteries. Co(OH) 2 -NiCo 2 O 4 /N-RGO exhibits the excellent catalytic activity for ORR with a positive half-wave potential of 0.80 V vs. RHE in 0.1 M KOH. And the assembled rechargeable Zn-air battery achieves a high open-circuit voltage of 1.485 V, a large peak power density of 99 mW cm −2 , and a remarkable cycle life of over 180 h. This work offers an inspiration to obtain efficient electrocatalysts for sustainable energy devices.
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高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 6
·e202200085
·
IF 3.82
Yang Gu,Chuqian Meng,Shuyue Dong,Hexin Zhu,Qian Liu,Yonglan Luo,Qingquan Kong,Tingshuai Li
High-performance earth-abundant electrocatalysts for oxygen evolution reaction (OER) are highly desirable. In this report, we successfully synthesized amorphous Fe−P shell electrodeposited on Co(OH)F nanowire arrays supported on titanium mesh (Fe−P@Co(OH)F/TM) as an efficient catalyst for OER. Such catalyst exhibits excellent OER activity with a low overpotential of 267 mV to reach the geometrical current density of 10 mA cm −2 in 1.0 M KOH. In addition, it has good electrochemical durability to maintain its activity for at least 20 h.
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高影响因子
RARE METALS
·
2025
·
IF 11
Ren Xiao-Qian,Chen Meng-Xin,Cao Xun,Dai Yu-Long,Yu Wen-Xiao,Liu Zhe,Wen Xin-Xin,Ma Guo-Xin,Guo Bing-Rong,Tan Sze-Xing,Liu Jia,Xu Ping,Gao Jia-Jian,Li Si-Wei
Metal oxohydroxides (MOOH) are widely accepted as the true active species for oxygen evolution reaction (OER). However, the MOOH converted from pre-catalysts usually exhibits better catalytic performance than those directly synthesized. The underlying structural reason for this phenomenon remains controversial. In this work, CoOOH and Co(OH) 2 with similar morphology are employed as model catalysts to investigate the origin of in-situ converted catalyst’s high activity, as Co(OH) 2 can be fully converted to CoOOH during OER. In-situ Raman, electron paramagnetic resonance, HR-TEM, and X-ray spectroscopic studies reveal that O vacancies in the CoOOH converted from Co(OH) 2 play a key role in its higher intrinsic activity towards OER than directly synthesized CoOOH. Furthermore, theoretical calculations and electrochemical methods indicate that O vacancies in CoOOH affect the interaction between Co–O bond, downshift the d-band center of Co, further weaken the adsorption of OH*, and finally facilitate the OER process over CoOOH. This work not only provides a deep understanding of pre-catalyst’s high OER activity by taking Co(OH) 2 as an example but also deliver insights into the activation process of other electrochemical oxidation reactions. Graphical
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tingyue Gong,Minghuo Wu,Shuo Liu,Yufeng Hu,Yiwen Zhang,Hao Zhou
The generation of high-valent cobalt-oxo species Co(IV)=O for the removal of organic pollutants has been challenging due to the low conversion efficiency of Co(III)/Co(II) and the high activation energy barrier of Co(II)-oxidant complexes. Here, we introduced oxygen vacancies into the material by incorporating Co(OH) 2 with chitosan to achieve a nano-complex Co(OH) 2 @CS, which was applied in the activation of peracetic acid (PAA) as oxygen vacancies could optimize the Co 3d orbital, improve the electron distribution in Co(OH) 2 , and accelerate activation of PAA. The reactive species were characterized by reactive oxygen species quenching, phenylmethylsulfoxide probing, and electron paramagnetic resonance (EPR), and the results confirmed that the Co(IV)=O was the predominant substance for the degradation process. After a systematical investigation of the reaction conditions, complete degradation of 4 typical SAs (10 mg/L) was achieved in 8 min. In addition, the system showed remarkable resistance towards inorganic (Cl - , H 2 PO 4 - and NO 3 - ) and organic compounds (humic acid) in real water (pond water and seawater). The degradation products/intermediates from sulfamethoxazole (SMX) were identified using liquid chromatography-high resolution tandem mass spectrometry, and the toxicity of these products was investigated by computational toxicology. It was found that the toxicity of most products was lower than their precursor SMX in terms of acute (all) and chronic toxicity (6 out of 7), indicating that this Co(OH) 2 @CS/PAA system was an environment-friendly approach for the treatment of SAs-containing wastewater.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hang Wang,Qing Sun,Yuanyuan Lin,Jian Zhang,Jiawei Sheng
Development of highly efficient and recyclable catalysts based on peroxymonosate (PMS) activation for the degradation of dangerous antibiotic contaminants was still a challenging topic. In this study, a highly efficient and recyclable heterogeneous Co(OH) 2 /ZnFe 2 O 4 (Co-ZF) catalysts derived from metal-organic frameworks (MOFs) were prepared by a facile alkaline solution hydrothermal method , a high specific surface area (100.4 m 2 g −1 ) and soft magnetic properties (Ms=25.3 emu g −1 ) composite material was obtained, and used for degrading norfloxacin (NOF) via PMS activation. The effects of temperature, alkali concentration, pH, initial NOF concentration, PMS and catalyst dosage on NOF degradation were discussed in detail. The results illustrated that the degradation rate of norfloxacin by the 3Co-ZF160 catalyst synthesized under 3 M NaOH and 160 ℃ hydrothermal conditions was 97.2%, after four consecutive cycles of degradation, the degradation rate of NOF by 3Co-ZF160 remained over 91% within 60 min. In contrast, the degradation rate of the Co 3 O 4 /ZnFe 2 O 4 (CZF-600) catalyst calcined at 600 ℃ was only 74% available. Furthermore, The results of radical quenching suggested that OH•, SO 4 • − , SO 5 • − and 1 O 2 functioned in the presence of the Co(OH) 2 /ZnFe 2 O 4 -PMS system. Eventually, NOF degradation pathways were tentatively proposed on the basis presented via LC-MS. The above results highlight that the practical application of Co(OH) 2 /ZnFe 2 O 4 heterogeneous catalyst in aqueous solution was of great significance.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Defeng Qi,Ying Wang,Xinru Xu,Xiao Jiang,Mushtaq Ahmad,Zhao Chao,Zhenyi Yu,Meiling Lian,Yong Wang,Zhen Zhang
Nanostructured transition metal sulfides (TMSs) have attracted great attention owing to their superior electric conductivity and easy redox reaction properties in oxygen evolution reaction (OER) catalysts. However, the strong metal-metalloid bonds (M−S) and metalloid-metalloid (S S) bonds in the crystal structure of TMSs are difficult to break, which might result in the insufficient formation of electrocatalytically active metal hydroxide species on the surface and prevent the realization of their full OER potential. Herein, we demonstrate an approach by sculpting Co(OH) 2 on Co 3 S 4 nanotubes (Co 3 S 4 /Co(OH) 2 ) as highly reactive and stable electrocatalysts for efficient OER. The electron transfer between cobalt and sulfur and the pre-sculpted Co(OH) 2 promote the formation of rich hydroxide active species on the surface of Co 3 S 4 /Co(OH) 2 . The optimized Co 3 S 4 /Co(OH) 2 –0.8 catalyst possesses excellent electrocatalytic activity for OER in an alkaline medium, with a relatively low OER overpotential of 269 mV (at 10 mA cm −2 ) and a Tafel slope of 95.2 mV dec -1 . This work provides a new sight of designing TMS electrocatalysts for practical application in efficient water splitting.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Hele Hua,Nan Zhang,Zhidan Wang,Rui Li,Yunfang Wang,Jianxin Liu,Peide Han,Caimei Fan,Yawen Wang
Electrocatalytic NO 3 − reduction reaction (NO 3 RR) has attracted much attention as a promising NH 3 synthesis pathway, and Cu-based catalysts have been proven to lead to advantages in nitrate reduction . However, the active hydrogen (H*) produced by the Cu-based catalyst is insufficient to satisfy the hydrogenation process of the NO 3 RR intermediate, resulting in a large generation of NO 2 − . In this paper, the Co(OH) 2 /Cu 2 O heterojunction was constructed to improve the kinetics of H 2 O dissociation to generate H* and Co(OH) 2 /Cu 2 O (5.87 %) showed lower faradaic efficiency (FE) of NO 2 − than Cu 2 O (50.95 %). Mechanistic studies reveal that the introduction of Co(OH) 2 can help Cu 2 O lower the energy barrier of H 2 O dissociation, greatly boosting the supply of active hydrogen (H*). Not only that, but the reaction energy barriers of *NO to *NOH can be greatly reduced. The final twofold reason works together to greatly improve the efficiency of hydrogenation of NO 2 − , largely solving the problem of FE reduction due to the delayed consumption of NO 2 − , thus realizing improved performance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhijia Liao,Ninghao Chu,Zhenyu Yuan,Yanbai Shen,Fanli Meng
This study successfully synthesized “silver ear-like” Co(OH)F using 15 nm SiO 2 spheres as seeds. Gas sensitivity of Co(OH)F with and without SiO 2 spheres to toluene was compared at different annealing temperatures. The results demonstrate that the Co(OH)F-Si-350 sensor exhibits optimal gas sensitivity to toluene, with a response of 35 (R g /R a ) to 100 ppm of toluene at 220℃, with response and recovery times of 50 s and 80 s, respectively. Notably, the sensor detected toluene concentrations as low as 50 ppb, indicating good sensitivity to low concentrations. These findings suggest that the structural transformation resulting from the introduction of SiO 2 nanospheres, forming ultra-thin nanosheet clusters (∼12 nm), provides abundant active sites, effectively promoting substance diffusion and adsorption/desorption processes. Additionally, the incorporation of fluorine enhances the Lewis acidity of the material, facilitating the formation of stable adsorption states for gas molecules on the surface. These results reveal the significant impact of the structural transformation caused by the introduction of SiO 2 nanospheres on gas sensitivity, providing a strong theoretical foundation for further optimizing gas sensor design.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 32
·15789-15796
·
IF 9.931
Jiali Sheng,Jiahui Kang,Zhixiong Hu,Yan Yu,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Exploring effective electrocatalysts is in urgent demand to boost their large-scale applications for direct ethanol fuel cells. Herein, for the first time, we report nanoparticle-assembled Pd nanocages with efficient catalytic activity towards ethanol electrochemical oxidation. The catalysts are prepared from the second template of a nanosheet surface of amorphous Co(OH)2 octahedral nanocages, which are prepared from the original template of octahedral Cu2O. These Pd octahedral nanocages exhibit a porous rough surface, which consists of smaller Pd nanoparticles, endowing them with highly active surface area and many active sites. For the electrochemical oxidation of ethanol, the Pd nanocages demonstrate superior activity (3765 mA mgPd−1), 4.8 times and 5.9 times those of commercial Pd/C and Pd nanocatalysts, respectively, prepared directly from an octahedral Cu2O original template. Furthermore, the Pd nanocages demonstrate excellent long-term durability.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Jun Zhang,Shuai Shao,Desen Zhou,Tingmin Di,Tielin Wang
Two-dimensional (2D) layered nanocomposite provides a surface-to-surface heterojunction, which is an effective way to improve the photocatalytic performance because larger contact areas can promote the separation rate of interfacial charge carriers. In this study, Co(OH)2/g-C3N4/Ni(OH)2 2D layered photocatalysts have been successfully synthesized through a simple precipitation–hydrothermal method. The composite achieves a high H2-production rate of 899 μmol·h–1·g–1, which exceeds the rate of samples only coupled with Co(OH)2 and Ni(OH)2 by 4.0 and 1.9 times, respectively. In addition, the activity is even higher than that of the optimized Pt-g-C3N4 sample (1 wt. % Pt–C). The characterization results reveal the close contact of g-C3N4 and Ni/Co hydroxides, and such a face-to-face contact can greatly improve the interfacial charge-transfer rate, resulting in a high photocatalytic performance. This work demonstrates a simple way to enhance the photocatalytic H2 production of g-C3N4 under the cooperative effect of Co(OH)2 and Ni(OH)2 and provides novel insights into constructing other 2D ternary heterostructure nanocomposites.
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高影响因子
FUEL
·
2023
·
IF 7.4
Jie Yu,Zhuoran Hou,Huayu Zhang,Xinsheng Zhou
The fabrication of electrode materials with a high specific capacitance is essential for the development of enhanced performance supercapacitors. A novel binder-free electrode material, composed of MnS/Ni 3 S 2 and Co(OH) 2 , was synthesized on nickel foam by hydrothermal, sulfuration, and electrodeposition techniques. The MnS/Ni 3 S 2 exhibited a unique flower-like structure, resulting in a high specific capacitance of 1780 F g −1 at 1 A/g. By optimizing the synthesis conditions through several characterization and electrochemical tests, the MnS/Ni 3 S 2 @Co(OH) 2 composite was obtained, which displayed an ultrahigh specific capacitance of 2495 F g −1 at 1 A/g and a capacitance retention rate of 86.1% after 5000 cycles at 10 A/g in three-electrode system. The synergistic coupling of MnS/Ni 3 S 2 and Co(OH) 2 , along with the conductive nickel foam substrate, donated towards the excellent electrochemical performance. Furthermore, the MnS/Ni 3 S 2 @Co(OH) 2 //AC asymmetric supercapacitor (ASC) device was constructed with MnS/Ni 3 S 2 @Co(OH) 2 as positive electrode, activated carbon (AC) as negative electrode and 1 M KOH solution as electrolyte, demonstrated a high energy density of 68.6 Wh kg −1 at 750 W kg −1 and excellent cycle stability with 91.2% capacitance retention after 10,000 cycles at 15 A/g. The outstanding electrochemical properties observed in both the pre-electrodeposition and post-electrodeposition samples indicate the effectiveness of reasonable design and construction of composite as a pathway for producing electrode materials with exceptional performance.
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高影响因子
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