ADVANCED MATERIALS
·
2018
·Vol. 30
·期 9
·1705366
·
IF 21.95
Dan Wu,Yicheng Wei,Xiang Ren,Xuqiang Ji,Yiwei Liu,Xiaodong Guo,Zhiang Liu,Abdullah M. Asiri,Qin Wei,Xuping Sun
It is highly desired but still remains challenging to design and develop a Co-based nanoparticle-encapsulated conductive nanoarray at room temperature for high-performance water oxidation electrocatalysis. Here, it is reported that room-temperature anodization of a Co(TCNQ) 2 (TCNQ = tetracyanoquinodimethane) nanowire array on copper foam at alkaline pH leads to in situ electrochemcial oxidation of TCNQ − into water-insoluable TCNQ nanoarray embedding Co(OH) 2 nanoparticles. Such Co(OH) 2 -TCNQ/CF shows superior catalytic activity for water oxidation and demands only a low overpotential of 276 mV to drive a geometrical current density of 25 mA cm −2 in 1.0 m KOH. Notably, it also demonstrates strong long-term electrochemical durability with its activity being retrained for at least 25 h, a high turnover frequency of 0.97 s −1 at an overpotential of 450 mV and 100% Faradic efficiency. This study provides an exciting new method for the rational design and development of a conductive TCNQ-based nanoarray as an interesting 3D material for advanced electrochemical applications.
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Jinhua Xu,Jinyu Zhang,Wenmin Zhang,Shiye Xie,Lan Zhang
Background Chiral pollutants present significant environmental and health concerns, with neurotoxic amino acid analogs like β-N-methylamino-L-alanine (BMAA) demonstrating enantiomer-specific bioaccumulation in aquatic ecosystems. Current analytical approaches for chiral environmental contaminants rely predominantly on chromatographic techniques that require extensive sample preparation (typically 24 h), limiting field deployment and high-throughput screening capabilities. Detection thresholds for these compounds (0.1–10 μg/L) necessitate sensitive methodologies that maintain stereochemical integrity. This study addresses these analytical challenges through the rational design of chiral cobalt hydroxide (CF–Co(OH) 2 ) nanomaterials engineered for dual-mode detection and separation functionality. Results A hierarchical porous α-Co(OH) 2 with tunable chirality (R/S/RS configurations) and morphologies (square, rough surface, snowflake, flower-like) via micelle-templated growth strategies. The materials demonstrated dual functionality: (1) Rapid colorimetric amino acid discrimination within 5 min with precision (RSD = 4.9 %, n = 6), validated through urinary l -tryptophan quantification (17.1 ± 0.4 μg/mL); (2) Ultrasensitive BMAA separation via SPE-HPLC-MS/MS with significantly improved detection limits (LOD = 0.02 μg/kg) and processing speed (144 × faster than conventional methods). The colorimetric detection mechanism exploits BMAA's ability to form cobalt-amine complexes that produce concentration-dependent yellow coloration, enabling visual detection at 50 μg/kg in freshwater samples. Field testing successfully detected BMAA in crucian carp (0.39 ± 0.03 μg/kg), confirming food-chain biomagnification with excellent recovery (90.1–102.7 %) across diverse matrices. The system's chiral specificity exhibited distinct affinity patterns (BMAA: R–Co(OH) 2 ; DAB: S–Co(OH) 2 ) with 91.4 % enantiomeric excess in just 10 min through configuration-specific “three-point binding” mechanisms (intramolecular binding energy: 18.7 kcal/mol). Significance This research establishes morphology-programmable chiral materials as a versatile analytical platform for rapid on-site environmental monitoring and high-throughput toxin analysis. The developed methodology directly addresses World Health Organization guidelines for algal toxin detection in drinking water while providing a generalizable approach for chiral pollutant discrimination in complex environmental and biological samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhuoran Hou,Jie Yu,Xinsheng Zhou,Zhibin Chen,Jiawei Xu,Boyu Zhao,Wenbao Gen,Huayu Zhang
A self-supporting composite electrode material with a unique three-dimensional structure was synthesized by in-situ growth of nanoscale NiMnLDH-Co(OH) 2 on a nickel foam substrate via hydrothermal electrodeposition. The 3D layer of NiMnLDH-Co(OH) 2 provided abundant reactive sites for electrochemical reactions, ensuring a solid and conductive skeleton for charge transfer and resulting in significant enhancement of electrochemical performance. The composite material showed a strong synergistic effect between the small nano-sheet Co(OH) 2 and NiMnLDH, which promoted reaction kinetics, while the nickel foam substrate acted as a structural conductivity agent, stabilizer, and good conductive medium. The composite electrode showed impressive electrochemical performance, achieving a specific capacitance of 1870F g −1 at 1 A g −1 and retaining 87% capacitance after 3000 charge–discharge cycles, even at a high current density of 10 A g −1 . Moreover, the resulting NiMnLDH-Co(OH) 2 //AC asymmetric supercapacitor (ASC) demonstrated remarkable specific energy of 58.2 Wh kg −1 at a specific power of 1200 W kg −1 , along with outstanding cycle stability (89% capacitance retention after 5000 cycles at 10 A g −1 ). More importantly, DFT calculations reveal that NiMnLDH-Co(OH) 2 facilitates charge transfer, accelerating surface redox reactions and increasing specific capacitance. This study presents a promising approach towards designing and developing advanced electrode materials for high-performance supercapacitors.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 10
·106518
·
IF 4.386
Qingxiao Zhang,Pei Han,Hui Zhang,Jixin Yao,Xinyu Wang,Dongmeng Chen,Xueqin Zuo,Qun Yang,Shaowei Jin,Guang Li
The oxygen evolution reaction (OER) is a critical process in the operation of electrochemical water splitting. Metal-organic frameworks (MOFs) are applied in the field of OER electrocatalysis because of their unique structure, but the high impedance and unstable framework during pyrolysis remain unresolved. Here, MIL-88A (iron-based MOF) was modified by hydrolysis and loading Co(OH)2 to improve the catalytic activity. The electrochemical results showed that the Co(OH)2/MIL-88A achieved the optimized performance with the current density of 10 mA cm−2 at 278 mV (vs RHE). Density functional calculations (DFT) combined with characterization tests suggest that electrons transfer from Co(OH)2 to MIL-88A at the interface of the heterostructure, leading to a larger hole electron pair density. D-band theory calculations demonstrated that the synergistic effect of MIL-88A and Co(OH)2 in heterostructure strengthens the adsorption between active sites and adsorbate. The above proofs are the source of the excellent OER performance of the Co(OH)2/MIL-88A. The finding has certain reference significance for the heterogeneous treatment of iron-based MOF catalysts.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·B42
·
IF 3.12
Yongling Du,Yifeng He,Zhixiang Zheng,Xuan Shen,Yaxin Zhou,Tingxia Wang,Zhengping Zhu,Chunming Wang
Co(OH)2 nano particles (NPs)/three-dimensional graphene frameworks (3DGFs) nano-materials was fabricated via electrochemical methods. The Co(OH)2 NPs/3DGFs hybrid retain the 3DGFs's structure and have superior catalytic activity for glucose oxidation. The electrochemical sensors based on Co(OH)2 NPs/3DGFs exhibited high sensitivity of 2410 μA cm−2mM−1, wide linear range of 2 μM to 1.4 mM, low detection limits of 0.67 μM and a quick response (less than 3s) to glucose. The Co(OH)2 NPs/3DGFs were used as a high performance platform to detect glucose in human serum, fetal bovine serum, and human urine. The excellent catalytic activity of Co(OH)2 NPs/3DGFs is attributed to the high surface area of 3DGFs and the highly catalytic activity of Co(OH)2 NPs as well as the synergistic effects between Co(OH)2 NPs and 3DGFs. Importantly, the electrochemical glucose sensor could be renewable only being refreshed in 0.1 M NaOH for ten minutes.
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2026
·
IF 9.7
Zheng Xia,Fu Yaoqiang,Ning Jing,Wang Haorui,Liu Hongfei,Cui Chunhua
Direct formate fuel cells (DFFCs) are becoming one of the most promising next-generation energy devices owing to their high energy density, low toxicity, and carbon neutrality. However, their practical application is hindered by the sluggish kinetics of the formate oxidation reaction (FOR) on conventional palladium (Pd)-based catalysts due to the strong adsorption of hydrogen intermediates (H ads ) that block the active sites. Herein, we tackled the above problem by tailoring the Pd electrocatalytic properties through the interfacial interaction with the hydroxyl group-abundant and oxophilic Co(OH) 2 substrate. This resulted in an impressive mass activity of 5.02 A mg
−1 Pd
for the synthesized Pd/Co(OH) 2 , approximately three times that of commercial Pd/C. Moreover, under high formate concentration, Pd/Co(OH) 2 exhibits significantly improved stability, i.e. , up to 24000 s sustainable current density with 100% selectivity toward CO 2 (CO 2 is actually converted to carbonate in alkaline media). Kinetic isotope effect (KIE) analysis and in situ Raman spectroscopy based mechanistic study reveal the excellent FOR performance of Pd/Co(OH) 2 originates from the partially oxidized Pd facilitated H ads oxidative removal and the more hydrophilic surface induced competitive HCOO − adsorption over H ads . This study demonstrates a rational strategy to optimize the Pd-based FOR electrocatalysts through the electronic and interfacial interactions with appropriate substrate to modulate the key intermediate adsorption-reaction kinetics.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 35
·2101720
·
IF 13.281
Yijie Wang,Aoshuang Li,Chuanwei Cheng
Developing highly active, cost-effective, and durable bifunctional oxygen electrocatalysts is an important step for the advancement of rechargeable Zn–air batteries (ZABs). Herein, an efficient bifunctional oxygen electrocatalyst of ultrathin Co(OH) 2 nanosheets supported on nitrogen-doped carbon nanoflake arrays (named as Co(OH) 2 @NC), is reported, which yields excellent bifunctional activity, i.e., a low overpotential of 285 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER), a high half-wave potential (0.83 V) for oxygen reduction reaction (ORR), and a low potential gap (Δ E ) of 0.69 V. The excellent bifunctional catalytic performance can be ascribed to the concerted efforts of cobalt hydroxide toward OER and nitrogen-doped carbon for ORR. The Co(OH) 2 @NC nanoflake arrays is further used as binder-free air cathodes for rechargeable Zn–air batteries, exhibiting a high specific capacity of 798.3 mAh g Zn −1 , improved stability (a working life of >70 h at 5 mA cm −2 ), as well as a reduced long-term charging voltage, which outperforms the counterparts of NC nanoflake arrays and Pt/C-based air cathodes. One step further, the Co(OH) 2 @NC nanoflake arrays on carbon cloth are directly used as binder-free air cathodes for flexible, solid-state ZABs, showing excellent performance under deformation as well.
研究领域:
电化学
·
能源材料
·
纳米材料科学
·
催化化学
·
可充电电池技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Tingting Fan,Li Cai,Zhulin Huang,Haibin Tang,Lijun Zhang,Zhongbo Li
A simple and reliable method is developed to fabricate Ag-nanoparticle-decorated Co(OH)2 nanoflowers grafted on polyacrylonitrile (PAN) nanopillar arrays as uniform and sensitive surface-enhanced Raman scattering (SERS) substrates. First, Co(OH)2-nanosheet-assembled nanoflowers are achieved on the highly uniform PAN nanopillar arrays via electrochemical deposition. Then, Ag nanoparticles (Ag-NPs) are decorated onto the Au-nanoparticle-precoated Co(OH)2 nanoflowers based on a spontaneous redox reaction (SRR) between the silver ions and Co(OH)2 nanosheets at room temperature. Ag-NPs can be successfully in situ synthesized on the Co(OH)2 nanoflowers, and Au nanoparticles precoated on the surface of the Co(OH)2 nanosheets can ensure that the Co(OH)2 nanoflower structure does not collapse. Because of the highly uniform PAN nanopillar arrays and the high-density sub-10 nm gaps between the neighboring Ag-NPs on the surface of the Co(OH)2 nanoflowers, the hierarchical three-dimensional Ag@Co(OH)x grown on PAN nanopillar arrays can produce a reproducible and sensitive SERS effect. To verify the SERS performance of the substrate, 4-aminothiophenol (4-ATP) is used as the probe molecule, and the Ag@Co(OH)x grown on PAN nanopillar arrays is employed as the SERS substrate. As a result, 4-ATP concentrations as low as 10–10 M can still be identified, exhibiting high SERS activity. Additionally, the relative standard deviation value of the main characteristic peak of 10–5 M 4-ATP is 9.43%, indicating good uniformity of the SERS signal of the substrate. The SRR between silver ions and Co(OH)2 can provide a simple route to prepare heterostructures as SERS substrates, which has great potential for application in the field of analysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yuxiang Li,Kaili Zhang
Metastable intermolecular composites (MICs) comprising solid fuels and oxidizers at nano-scale exhibit high energy densities and fast reaction speeds. As most metal and metalloid fuels are passivated by the natural oxide layer on the surface which acts as a reaction barrier, fluorine-containing oxidizers are of particular interest to promote the reactivity through interfacial fluoridation. In this work, cobalt hydroxy fluoride (Co(OH)F) was introduced as a functional fluorine-containing oxidizer, and core-shell structured Co(OH)F@Al nanoarray was fabricated onto a glass substrate . The thermal behavior and reaction mechanism of pure Co(OH)F and Co(OH)F@Al composites were thoroughly investigated, and Co(OH)F@Al was compared with CoO@Al and Co 3 O 4 @Al with identical morphology. In the Co(OH)F@Al composite, a pre-ignition reaction was observed which was attributed to the etching of Al 2 O 3 shell by HF and the fluoridation of Al core by HF and CoF 2 . With the assistance of pre-ignition reaction, Co(OH)F@Al can complete main exothermal reaction before Al melting in a solid-state mechanism, and its peak temperature is around 200 ℃ lower than those of MICs employing CoO and Co 3 O 4 as oxidizers.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 8
·1907043
·
IF 11.459
Chun Li,Yanting Gao,Xifeng Xia,Junwu Zhu,Xin Wang,Yongsheng Fu
Conjugated coordination polymers (CPs) with designable and predictable structures have drawn tremendous attention in recent years. However, the poor electrical conductivity and low structural stability seriously restrict their practical applications in electronic devices. Herein, the rational design and synthesis of a hierarchically structured 2D bimetallic CoNi-hexaaminobenzene CPs derived from Co(OH) 2 are reported as an efficient oxygen evolution reaction (OER) self-supported electrode. The as-obtained electrode possesses high electrochemical surface area and intrinsic activity, exhibiting high electrochemical catalytic activity, favorable reaction kinetics performance, and strong durability compared with those of the powder catalysts. As a result, the electrode delivers low overpotential of 219 mV @ 10 mA cm −2 and Tafel slope of 42 mV dec −1 as well as 91.3% retention of current density after 24 h of reaction time. The results of density functional theory computations reveal that the synergistic effect of Co and Ni plays an important role in OER. This work not only presents a strategy to fabricate advanced self-supported electrodes with abundant and dense active sites, but also promotes the development of conjugated CPs for electrocatalysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 10
·2520-2525
·
IF 4.495
Jiali Sheng,Jiahui Chen,Jiahui Kang,Yan Yu,Ning Yan,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Graphical Yolk-shell nanocages : Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages composed of crystalline Cu 2 O core and amorphous Co(OH) 2 shell are fabricated by a facile Cu 2 O self-templated strategy at room temperature. The as-prepared yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation due to the sufficient active sites and large surface area, synergistic effect between Cu 2 O and Co(OH) 2 , which are benefited from the special yolk-shell nanocages. Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages are synthesized by a facile Cu 2 O self-templated strategy as efficient glucose oxidation electrocatalysts. Amorphous Co(OH) 2 nanoflakes are formed as octahedral shells through coordinating etching conversion from part of Cu 2 O templates. The un-etched crystalline Cu 2 O octahedrons are then remained as cores and voids exist between the cores and shells. The special structure endow these yolk-shell heterostructure nanocages with abundant active sites, large surface area, and synergistic effect between Cu 2 O and Co(OH) 2 . The octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation in terms of high sensitivity of 1340 μA cm −2 mM −1 , low detection limit of 2 μM, wide linear sensing range, and long-term stability. This strategy might shed lights on the synthesis of various yolk-shell heterostructure nanocages with controllable structures and enhanced catalytic performances.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jin Yue,Sun Liping,Wang Yuechen,Huo Lihua,Zhao Hui
Electrocatalytic nitrate reduction reaction (NO 3 RR) provides a promising method for ammonia (NH 3 ) producing. It is urgent to develop efficient catalysts with improved NO 3 RR performance. In this paper, Cu 3 P@Co(OH) 2 /CF heterostructure catalyst is constructed by electrodeposition of cobalt hydroxide (Co(OH) 2 ) nanosheet on the surface of copper phosphide (Cu 3 P) nanorod , and used as a self-supporting cathode for electrocatalytic reduction of nitrate to ammonia. The NH 3 yield reaches 0.19 mmol h −1 cm −2 at a potential of −0.17 V vs. RHE, and the faraday efficiency (FE) is 86.7 %. The study manifests that the built-in electric field generated at the p-n heterojunction interface optimizes the electron migration kinetics, and promotes the adsorption of nitrate and the convention of intermediate product NO 2 − into ammonia. As a consequence, the selectivity of NH3 is improved. The Zn-nitrate battery is assembled with the designed catalyst as the cathode, to reach a peak power density of 5.16 mW cm −2 . The prepared catalyst realizes three effective functions: power output, ammonia synthesis , and nitrate pollutants treatment.
✓ 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）