NANOTECHNOLOGY
·
2020
·Vol. 31
·期 32
·325502
·
IF 3.551
Nianfeng Shi,Shupei Sun,Bo Zhang,Qian Du,Yanxin Liao,Xiaoming Liao,Guangfu Yin,Zhongbing Huang,Ximing Pu,Xianchun Chen
Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrodes for non-enzymatic glucose detection were fabricated by electrodepositing Co(OH)2 nanosheets on Cu(OH)2 nanorods substrate grown directly on the copper sheet via a simple one-step reaction. The Co(OH)2 nanosheets/Cu(OH)2 nanorods composite electrode was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The glucose sensing performance of the composite electrode was investigated by cyclic voltammetry and chronoamperometry. The composite electrode shows high sensitivity of 2366 µA mM−1 cm−2 up to 2 mM with a lower detection limit of 0.17 mM (S/N = 3). The composite electrode is highly selective to glucose in the presence of various substances that always co-exist with glucose in real blood samples. The response of the composite towards human blood serum was in good agreement with that of commercially available glucose sensors, suggesting that a promising electrode material for highly sensitive and selective non enzymatic detection of glucose can be envisioned.
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Frontiers in Chemistry
·
2020
·
IF 3.693
Zhou Xinfeng,Qi Weihong,Yin Kai,Zhang Ning,Gong Shen,Li Zhou,Li Yejun
Highly efficient and low-cost non-noble metal based electrocatalysts for oxygen evolution reaction (OER) have attracted more and more attention in recent years. However, the current research has been focused on the construction of novel OER electrocatalysts themselves, little attention has been paid to the modification of the substrates. In this work, a different strategy is proposed via laser ablation to fabricate the Cu foams with rich micro/nano-structures as OER substrates. Later, the precipitation conversion method was utilized to grow cobalt hydroxide on the laser fabricated Cu foams. The as-produced Cu/Cu oxides/Co(OH)2 electrocatalysts exhibit high OER activity in 1 M KOH, requiring an overpotential of only 259 mV at a current density of 50 mA cm−2 with excellent mild-term durability. The improved catalytic performance of the prepared samples can be attributed to the increased surface area, rich active sites, and the superhydrophilicity of the laser produced micro/nano-structures.
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INORGANICA CHIMICA ACTA
·
2025
·
IF 3.2
Lei Yuan,Yuanzhen Liu,Zhenyu Zhu,Na Xin,Liwei Zhang,Chunming Xu
We introduce Co(OH)₂/Ni₂Co (PO₄)₂ composite nanomaterials, synthesized via hydrothermal synthesis, as potential high-stability cathode materials for hybrid supercapacitors (HSCs). Structural characterization tests, such as XRD, SEM, HRTEM, and XPS, revealed the subtleties of the morphology, structure, and composition of these nanostructures. The electrode material exhibits an ultra-high capacitance of 2131.2 F g −1 at 1 A g −1 . When combined with activated carbon (AC), the resulting HSC exhibits a high capacitance of 123.2 F g −1 and remarkable cycle life, with 94.6 % capacitance retention after 12,000 cycles. The device achieves an energy density of 39.5 Wh kg −1 at 750 W kg −1 . This study meticulously details the synthesis, structural characterization, and extensive electrochemical analysis, culminating in their effective application in HSCs.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Xiaoyu Qiu,Linting Zou,Jianmei Cen,Xingnian Duan
In this research, Mo-oxides complexes combined with Co(OH) 2 grown on three-dimensional (3D) nickel foam (Mo-Co(OH) 2 /NF) were developed as a peroxymonosulfate (PMS) activator enabling a pathway transition from radical to non-radical for efficient degradation of organic pollutants. The incorporation of high-valence Mo species promoted the formation of sheet structure and facilitated the Co(II)/Co(III) ratio, while Co served as the primary active site for PMS activation. Consequently, complete removal of 40 mg/L Rhodamine B (RhB) in optimized conditions (catalyst = 1.5 cm 2 , 0.4 g/L PMS dosage, reaction temperature = 25 °C) was achieved within 2 min. In addition, excellent adaptability was exhibited over a wide pH (3.0–9.0) and versatility (99 %, 80.94 % and 91.54 % for MB, LFX, and TC, respectively) in Mo-Co(OH) 2 /NF + PMS system. Impressively, radical scavenging experiments and electron spin resonance (ESR) analyses revealed that the degradation process was mainly dominated by the conversion of O 2 •– to non-radical 1 O 2 . Hence, this work demonstrates the potential of high-valent metal-oxides complexes integrated with Co(OH) 2 as effective PMS activators for non-radical degradation of dye and other refractory antibiotics, significantly broadening their applications in environmental remediation.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shuaipeng Wang,Li Xu,Weixin Lu
Non-noble metal catalysts with high-performance are intensively exploited toward water electrolysis. Herein, we fabricate a novel Ni 3 S 2 @Co(OH) 2 heterostructure with a tentative method combining hydrothermal method with electrodeposition, in which the Ni 3 S 2 nanosheets are evenly integrated with Co(OH) 2 nanoparticles. Electrochemical tests reveal preeminent catalytic activities and durability on this heterostructure for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). It presents high catalytic activities of 110 and 257 mV at 10 mA cm −2 for HER and OER, respectively, in 1.0 M KOH solution. Moreover this bifunctional electrode requires only 1.61 V to reach 10 mA cm −2 and shows excellent durability when assembled as an electrolyzer, superior than that of Pt-C||IrO 2 . The promoted activities are benefited from the interfacial cooperation and synergistic effect between Ni 3 S 2 and Co(OH) 2 , because of which the charge-transfer ability is enhanced and surface reactivity is of furtherance. This work is of very profound significance on electrocatalysts for water splitting, specific performances: (1) This heterostructure is synthesized based on interface engineering. (2) The promoted performance is due to the synergistic effect of two onefold-components. (3) The catalysis activities for HER and OER can synchronously reach ideal states when it is used as bifunctional catalyst.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Cao Cui,Jingyun Wang,Zhenguo Luo,Jin Wang,Chunxia Li,Zhengquan Li
Cobalt hydroxide in α-form (α-Co(OH) 2 ) is an attractive electrocatalyst for oxygen evolution reaction (OER). Traditional preparation of α-Co(OH) 2 nanosheets often leads to a packing morphology after synthesis or post electrode fabrication, which severely limits the exposure of surface active sites. In this work, we report the synthesis of a self-supported 3D flower-like structure consisting of 2D α-Co(OH) 2 nanosheets through a metal-organic-framework (MOF)-mediated synthetic method. We found that the formation of MOF intermediates can produce dispersive α-Co(OH) 2 nanosheets with a stable 3D hierarchical structure which can effectively avoid the packing of individual nanosheets. The developed α-Co(OH) 2 nanosheets exhibit an obviously enhanced OER activity in comparison with the nanosheets prepared with traditional method. The prepared α-Co(OH) 2 nanosheets have been well characterized and their formation mechanism is proposed.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Liang Luo,Qi Shen,Lixing Wang,Huiluan Qin,Song Lu,Yeqing Wang,Jiadi Ying,Tiancun Liu,Min Guo,Zhixin Yu
Hierarchical Co(OH) 2 /FeOOH is constructed via a facile one-step heterogeneous nucleation strategy. • Self-sacrificial FeOOH nanoneedles protects Co-based active phases under high current. • Efficient Co 2+ →Co 3+ conversion enriches high-valence active sites for accelerated OER kinetics. • The catalyst delivers an low overpotential of 275 mV at 200 mA cm −2 . • The catalyst achieves remarkable operational stability for over 450 h at 1 A cm −2 for OER. Cobalt hydroxide-based catalysts are promising candidates for electrochemical water splitting, yet their practical application in industrial electrolysis is hindered by insufficient activity under high-current conditions. Herein, we rationally construct a hierarchical Co(OH) 2 /FeOOH composite via a one-step heterogeneous nucleation strategy, where FeOOH nanoneedles are uniformly anchored on Co(OH) 2 nanosheets frameworks. The composite achieves an ultra-low overpotential of 275 mV at 200 mA cm −2 for oxygen evolution reaction (OER), with a lower Tafel slope. More notably, it maintains stability with negligible potential fluctuation over 450 h under an industrially relevant current density of 1 A cm −2 . The FeOOH promotes efficient Co 2+ →Co 3+ valence transition, while the hierarchical interfacial interactions enhance charge transfer efficiency and stabilize high-valence Co active species. A unique self-sacrificial mechanism is unveiled that preferential tip dissolution of FeOOH nanoneedles effectively protects the underlying Co-based active sites from over-oxidation and structural collapse, thereby ensuring long-term catalytic stability. Mechanistic studies further suggest that Co(OH) 2 /FeOOH exhibits enhanced lattice-oxygen-participated character relative to CoFe-LDH, which tends to follow the adsorbate evolution mechanism. This work develops a self-sacrificial interface engineering strategy to boost the activity and stability of Co(OH) 2 , and provides a feasible structural design paradigm for developing durable OER electrocatalysts toward industrial-relevant high-current conditions. A unique self-sacrificial interface engineering strategy to boost the activity and stability of Co(OH) 2 for oxygen evolution reaction. Download: Download high-res image (157KB) Download: Download full-size image
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 2
·219-223
·
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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Nanomaterials
·
2022
·Vol. 12
·期 22
·3972
·
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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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 3
·1158-1167
·
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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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Akram Naeem,Guo Jia,Ma Wenlan,Guo Yuan,Hassan Afaq,Wang Jide
The exploration of advanced water treatment technologies e.g. heterogeneous photocatalysis is the most promising way to address organic pollution issues. Semiconductors based bimetallic photocatalysis with wide bandgap, have displayed splendid degradation performance in the UV light region, but their extension to the visible light/near infra-red region is still a matter of great concern. CuO, Co(OH) 2 , CoO and Co(OH) 2 /CuO nanocomposites were synthesized via simple co-precipitation method and further practiced for Rhodamine B (RhB) decomposition by introducing per-sulfate (PS) as a sacrificial agent. Results revealed that Co(OH) 2 /CuO catalyst had shown robust catalytic activity for RhB photodegradation (degradation time 8 min, k = 0.864 min −1 ) under light illumination, significantly less (12–60 times) than the other reported bimetallic catalysts. Catalyst also have verified excellent performance for a broader pH range (5–9) with excellent stability. Main reactive species responsible for the photocatalytic reaction were sulfate (SO 4 •− ) and superoxide (O 2 • ) radicals, duly verified by ESR and by using radical scavengers. With outstanding recycling abilities, this is probably the fewer successful attempt for RhB decolorization and can be highly favorable for effluent treatment by using the synergic effect of absorption and photodegradation.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 8
·3404-3410
·
IF 5.968
Xiao-lei Huang,Jia Chai,Tao Jiang,Ying-Jin Wei,Gang Chen,Wan-qiang Liu,Dongxue Han,Li Niu,Limin Wang,Xin-bo Zhang
Large-area Co(OH)2 nanosheets have been successfully coated with ionic liquid modified graphenevia a general strategy. The advantageous combination of graphene and the 2D structure of the Co(OH)2 nanosheets endows the obtained heterostructures with a remarkable lithium-storage performance, including high reversible capacity and superior cyclic and rate performance.
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