APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mengke Li,Yang Yang,Yajie Zhang,XinZhuo Liu,Yulan Li,Xiaobin Niu
NiFe-layered double hydroxides (NiFe LDHs) are regarded as outstanding electrocatalysts for the oxygen evolution reaction (OER), but the inherent charge transport limitations hinder their practical application. Herein, we developed a 3D hierarchical α-Co(OH) 2 /NiFe LDH/NF composite catalyst via a simple electrodeposition-hydrothermal method. The introduction of α-Co(OH) 2 enables interfacial electron modulation with NiFe LDH, driving electron transfer from Ni/Co sites to Fe centers via multi-pathway coupling channels (Ni–O–Fe, Ni–O–Co, Co–O–Fe). This electron redistribution creates an optimized coordination environment that promotes the formation of high-valence Ni and Co species, subsequently facilitating the in situ formation of highly active phases (γ-NiFeOOH and CoOOH) during the OER process. The derived γ-NiFeOOH provides superior intrinsic activity, while the coexisting. CoOOH significantly enhances charge transport due to its high electronic conductivity. As a result, the composite achieves an overpotential of only 285 mV at a current density of 500 mA cm −2 , outperforming both NiFe LDH (372 mV) and α-Co(OH) 2 (441 mV). Additionally, this catalyst shows an excellent long-term stability at 100 mA cm −2 for 120 h. This work demonstrates that interfacial electronic modulation offers a strategy for designing efficient and durable OER catalysts capable of operating at industrial current densities.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 24
·
IF 4.3
Luan Liu,Hongru Liu,Zikang Chen,Genghua Cao,Xiaoyu Wu,Baorui Jia,Xuanhui Qu,Mingli Qin
A rapid solvent-free microwave-assisted strategy was developed to fabricate Pt- and Ni-modified Co(OH)2catalysts for alkaline hydrogen evolution. Among them, Ni-Pt@Co(OH)2, prepared via sequential Ni-first then Pt loading, exhibited the best performance. Structural analyses confirmed uniform Pt dispersion with dominant Pt(111) facets, while ICP-MS showed reduced Pt usage compared to Pt@Co(OH)2. Electrochemical measurements in 1.0 M KOH revealed an overpotential of 71 mV at 10 mA·cm−2, comparable to Pt/C, and a mass activity 4–6.5 times higher across 25–75 mV. EIS demonstrated lower charge-transfer resistance, and stability tests showed negligible degradation after 3000 CV cycles and 11 h continuous operation. The outstanding performance arises from enhanced Pt utilization, abundant conductive sites, and strong Ni-Pt interfacial synergy, highlighting Ni-Pt@Co(OH)2as a promising catalyst for efficient alkaline HER with reduced Pt consumption.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Sustainable Systems
·
2023
·Vol. 7
·期 5
·2200473
·
IF 7.1
Jing Tang,Qingdong Ruan,Hongmin Yu,Chao Huang
Electrocatalytic water splitting generated oxygen (O 2 ) and hydrogen (H 2 ) is a promising way to solve the energy crisis. Oxygen evolution reaction (OER) compared to hydrogen evolution reaction (HER) has slow kinetics hindering overall process. Recently, cobalt hydroxide (Co(OH) 2 ) with high activity and stability for OER has attracted more attention. During the OER process, the Co 2+ in Co(OH) 2 is further oxidized to Co 3+ and CoOOH species are true active sites. However, the low conductivity of Co(OH) 2 hinders its oxidization to CoOOH. In addition, spontaneous growth of Co(OH) 2 agglomerates easily during hydrothermal treatment, leading to decreased active sites. Herein, an efficient strategy is developed to construct highly dispersive Co(OH) 2 nanosheets vertically grown on V 2 O 5 nanoflowers (Co(OH) 2 /V 2 O 5 ) at room temperature. The V 5+ of V 2 O 5 can oxidize Co 2+ of Co(OH) 2 into Co 3+ , resulting in in situ formations of CoOOH species favorable to the OER process. In situ Raman also investigates that the OH - species are inserted more easily into the interlayer of Co(OH) 2 of (Co(OH) 2 /V 2 O 5 ) than that of pure Co(OH) 2 . Therefore, the hybrid Co(OH) 2 /V 2 O 5 exhibits low overpotentials of 320 and 370 mV at a current density of 10 and 50 mV cm -2 , respectively, and a small Tafel slope of 68 mV dec -1 .
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Le Zhang,Xin Zhou,Shaohua Chai,Jian Guan,Guijun Fan,Wuxinchen Yang,Guojun Ma,Ning Han,Yunfa Chen
There is a high demand to synthesize ozone decomposition catalysts especially in high-space-velocity and high-relative-humidity (RH) environments. Herein, two polymorphs of cobalt hydroxide, α- and β-Co(OH)2, are synthesized and applied for ozone elimination. β-Co(OH)2 shows ∼90% ozone decomposition efficiency under high space velocity (weight hourly space velocity (WHSV) = 1,200,000 mL g–1 h–1, 25 °C, 40 ppm), which is far higher than that of α-Co(OH)2 (∼5%). β-Co(OH)2 has high spin Co(II) in distorted octahedral coordination caused by the Jahn-Teller effect, leading to a higher crystal field splitting energy level and thus contributing to the easier electron transfer between the ozone and catalyst. Moreover, β-Co(OH)2 still shows high performance (∼87%) even in humid conditions (RH ∼50%, 25 °C, 40 ppm, WHSV = 600,000 mL g–1 h–1), which is attributable to its abundant surface non-hydrogen-bonded hydroxyls weakening water molecule adsorption, providing an idea to develop highly efficient catalysts for ozone decomposition in humid environments.
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yali Niu,Rui Yao,Shuhui Fan,Jinping Li,Guang Liu
Anion-exchange membrane water electrolyzers (AEMWE) are promising for clean hydrogen production. However, the high energy barriers associated with water adsorption and dissociation combined with the high adsorption energy of hydrogen intermediates (H*) in alkaline environment result in slow kinetics for the hydrogen evolution reaction (HER). To tackle this, we report a catalyst comprising Pt nanoparticles loaded on Co(OH) 2 /PTI nanosheets (Pt/Co(OH) 2 /PTI) for efficient alkaline HER at high current densities. Operando characterization indicates that Co(OH) 2 promotes H 2 O adsorption and dissociation, while the Pt nanoparticles optimize H* adsorption energy, enabling preferential H* adsorption at the Pt site to facilitate H 2 generation and desorption. Furthermore, the ultra-thin poly (triazine imide) (PTI) support prevents the Pt nanoparticles aggregation, thereby enhancing catalyst stability. As a result, the synergistic Pt/Co(OH) 2 /PTI achieves superior HER performance, demanding an overpotential of merely 7 mV to achieve a current density of 10 mA cm −2 and just 220 mV to drive 1 A cm −2 , and it maintains stable for over 220 h under the condition of 1 A cm −2 . Additionally, the electrolyzer assembled using Pt/Co(OH) 2 /PTI as the cathode demonstrates stable operation for 200 h at 0.5 A cm −2 under 70 °C, highlighting its strong potential for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Lanlan Yu,Jincheng Mu,Huiling Liu,Gang Liao,Boyi Li,Yufen Xia,Zhimin Wang,Jili Yuan,Jiachao Shen,Chengbin Liu
Electrocatalytic nitrate reduction into ammonia (NitRR) over Co-based catalysts is attractive but still constrained by the competition with H* coupling to produce H 2 . Additionally, the fundamental mechanism underlying the interfacial engineering associated with electronic state transformation for strengthening oriented NitRR remains elusive. Herein, a Co(OH) 2 /Bi 12 O 17 Br 2 heterostructure is fabricated using a one-step wet chemistry method, performing remarkable reactivity for NH 3 production own to the formation of electron-deficiency Co sites induced by Bi 12 O 17 Br 2 . Unexpectedly, the NitRR activity of Co(OH) 2 /Bi 12 O 17 Br 2 increases gradually in the initial stage and then keeps at a high level, which is uncovered as the reconstruction of Bi 12 O 17 Br 2 into Bi 0 . Theoretical calculations suggest that the in situ reconstruction guides the electron-deficiency of Co and the shift of d -band center of Co toward the Fermi level, thus promoting the adsorption and conversion of intermediates. The synergistic effect of the hydrolysis dissociation over Co(OH) 2 and the inhibition of H* coupling over Bi 0 contributes to high selectivity and activity for NitRR. The reconstructed catalyst shows a high ammonia yield rate of 7343.3 µg h −1 mg −1 at −0.6 V versus RHE and nearly 100% Faradaic efficiency at −0.4 V versus RHE. This study provides insight into the strengthening mechanism of Co-based catalysts for NitRR.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Yifei Huang,Hongliang Dai,Hongye Bai,Weiqiang Fan
Biomass materials as an abundant renewable resource could replace traditional fossil fuels and non-renewable materials, providing a new solution to achieve sustainable development. In this paper, Ce-modified Co(OH) 2 /Cu 2 O composite catalysts were prepared by an electrodeposition method, and the CoOOH/CuOOH dual active sites were successfully obtained through an electrochemical reconfiguration strategy, and the experimental results showed that the incorporation of Ce induced the formation of high-valent Co and Cu species, which improved the activity of electrocatalytic HMF oxidation. At 0.55 V vs Hg/HgO, the HMF conversion reached 100%, the FDCA yield was 95.04% and the Faraday efficiency was up to 98.47%. These results confirm the effectiveness of Ce-based non-precious metal catalysts in electrochemical reconstruction strategies and demonstrate their potential application in the high-value conversion of biomass derivatives. This finding not only provides a solid research basis for the development of highly efficient catalysts, but is also expected to promote the development of related technological fields.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Xiaojun Tang,Wenhao Lv,Song Lv
Customized Co(OH) 2 interface layer designed by electrodeposition. • The NF@[Co] 120 /Mn/[Co] 60 composite electrode integrates "conduction-adhesion-protection" functions. • Achieves high volumetric capacitance and excellent cycling stability. • Provide a novel design strategy for next-generation flexible and wearable energy storage devices. The in-situ synthesized nickel foam(NF)/manganese dioxide(MnO 2 ) electrode shows great promise for flexible supercapacitors owing to its high theoretical capacity, abundance, and eco-friendliness. However, the practical application of MnO 2 is hindered by poor conductivity, significant volume expansion, dissolution in electrolytes, and weak adhesion to smooth NF. To address these challenges, this work leverages the advantages of high conductivity and interface modification offered by Co(OH) 2 to precisely construct a sandwich-structured composite electrode(NF@[Co] 120 /Mn/[Co] 60 ) at the MnO 2 interface layer, which integrates conductive, adhesive, and protective functions. Benefiting from the advanced structure, the composite electrode exhibits outstanding electrochemical performance. NF@[Co] 120 /Mn/[Co] 60 achieves a capacitance of 340.31 F g −1 at 1 mA cm −2 , with a capacitance retention of 196.05 F g −1 when the current density increases to 20 mA cm −2 , and a capacity retention rate of 86.68% after 9000 cycles. Moreover, by utilizing the smooth and continuous macroscopic interface of the outermost Co(OH) 2 nanosheets, we integrated it with hydrogel electrolyte to assemble flexible supercapacitor (NF@[Co] 120 /Mn/[Co] 60 //PAA//AC). This device delivers an energy density of 74.95 Wh kg –1 at a power density of 994.94 W kg –1 and demonstrates excellent mechanical flexibility. This novel structural design provides a new electrode system strategy for the development of flexible wearable energy storage systems. Download: Download high-res image (197KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-13
·
IF 6.408
Wang Fang,Shi Fengna,Chen Cheng,Huang Kexin,Chen Naipin,Xu Ziqi
Cobalt hydroxide nanoparticles (Co(OH) 2 NPs) were uniformly deposited on flexible carbon cloth substrate (Co(OH) 2 @CC) rapidly by a facile one-step electrodeposition, which can act as an enzyme-free glucose and uric acid sensor in an alkaline electrolyte. Compositional and morphological characterization were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), which confirmed the deposited nanospheres were Co(OH) 2 nanoparticles (NPs). The electrochemical oxidation of glucose and uric acid at Co(OH) 2 @CC electrode was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry methods. The results revealed a remarkable electrocatalytic activity toward the single and simultaneous determination of glucose and uric acid at about 0.6 V and 0.3 V (vs. Ag/AgCl), respectively, which is attributed to a noticeable synergy effect between Co(OH) 2 NPs and CC with good repeatability, satisfactory reproducibility, considerable long-term stability, superior selectivity, outstanding sensitivity, and wide linear detection range from 1 uM to 2 mM and 25 nM to 1.5 uM for glucose and UA, respectively. The detection limits were 0.36 nM for UA and 0.24 μM for glucose (S/N = 3). Finally, the Co(OH) 2 @CC electrode was utilized for glucose and uric acid determination in human blood samples and satisfying results were obtained. The relative standard derivations (RSDs) for glucose and UA were in the range 6 to 14% and 0 to 3%, respectively. The recovery ranges for glucose an UA were 97 to 103% and 95 and 101%, respectively. These features make the novel Co(OH) 2 @CC sensor developed by a low-cost, efficient, and eco-friendly preparation method a potentially practical candidate for application to biosensors. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 8
·3945-3956
·
IF 2.961
Wei Xuedong,Chai Yudan,Chen Weifeng,Liu Nan,Qiao Shuangyan
In this paper, an amorphous composite electrocatalyst of Co(OH) 2 -Ni(OH) x S y was prepared by a simple and rapid electrochemical deposition method on nickel foam (NF). The electrochemical performance for oxygen evolution reaction (OER) was tested in 1 M KOH solution. The overpotential of Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) electrode was 423 mV at 50 mA cm −2 . The potential of the Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) sample remained essentially unchanged from the initial potential of 1.651 V after 12 h of stability test. In this catalyst, the strong synergistic effect between cobalt and nickel ions, the greatly increased amorphous defect sites and oxygen vacancies, and the abundant electrochemical specific surface area together lead to the increased electrocatalytic activity and high electrocatalyst stability. This amorphous CoNi-based composite electrocatalyst prepared by simple electrodeposition has certain significance for the preparation of hydrogen energy.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yiwen Huang,Guijuan Wei,Jia He,Cuihua An,Min Hu,Miao Shu,Junfa Zhu,Shuang Yao,Wei Xi,Rui Si,Zhi-Ming Zhang,Changhua An
The exploration of highly-efficient oxygen evolution reaction (OER) electrocatalyst with well-defined structure to understand specific structure-performance relationship is crucial to meet the requirement of water-splitting. Herein, we firstly used atomically dispersed IrCl x to uniformly decorate ultrathin Co(OH) 2 nanosheets to dramatically improve electrocatalytic activity. The synthesized IrCl x -Co(OH) 2 nanosheets/carbon nanotubes (CNTs) exhibits an overpotential of 230 mV to reach 10 mA/cm 2 , which was much enhanced compared to that of pristine Co(OH) 2 /CNTs (308 mV) and commercial benchmark IrO 2 (309 mV). X-ray absorption fine structure and density functional theory simulations demonstrate strong interfacial interaction between IrCl x and Co(OH) 2 nanosheets via the Cl-Ir-O and Ir-Cl-Co bond can efficiently boost its electronic conductivity. The accelerated charge transfer promotes the formation of more positively charged O atoms around cobalt centers, which is beneficial for the deprotonation on IrCl x -Co(OH) 2 and makes the catalyst facilitate OER.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Linan Wang,Shuxian Zhuang,Liu Wang,Na Wang,Hengliang Mo,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
Co(OH) 2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH) 2 Nfs/Ni f ) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH) 2 Nfs/Ni f composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH) 2 Nfs/Ni f composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH) 2 Nfs/Ni f electrode shows not only an extremely high sensitivity of 42.7 mA mM −1 cm −2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH) 2 Nfs/Ni f also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH) 2 Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH) 2 Nfs/Ni f electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH) 2 Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
✓ 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）