Journal of Materials Chemistry A
·
2026
·
IF 9.2
Tao Li,Qing Zhang,Xiaoyi Dou,Bowen Deng,Danni Yang,Hua Kun Liu,Shi Xue Dou,Yuhai Dou,Ding Yuan
We propose a dual-defect engineering approach for boosting the oxygen evolution reaction (OER) performance of CoOOH, implemented through the simultaneous incorporation of sulfur dopants and cobalt vacancies to tailor its electronic structure. First-principles calculations indicate that this synergistic interaction efficiently refines the binding geometry of key intermediates, leading to a substantial decrease in the energy barrier associated with the rate-determining step. Electrochemical characterization confirms the optimized catalyst's exceptional performance, delivering a low overpotential of 251.4 mV to reach 10 mA cm−2 and a Tafel slope of 51.8 mV dec−1 in 1 M KOH.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Weikang Hu,Qiang Liu,Tianxi Lv,Fang Zhou,Yijun Zhong
Bimetallic CoNi-LDHs as catalyst candidates for OER have attracted increasing interests due to their high catalytic activities, low cost and earth abundance. In this work, a series of Co x Ni-LDH nanosheets were synthesized by a chemical co-precipitation method. The impact of Co roles on OER catalytic activities, oxidation conversion of nickel metal ions and resistance of charge-transfer reactions (R ct ) was investigated. The electrochemical dynamic behavior of bivalent Co II was characterized by CV and EIS in combination with XPS. The surface morphologies and microstructure were studied by SEM and TEM, respectively. The results show that Co II is irreversibly oxidized to Co III OOH at interface in the first anodic polarization process prior to the occurrence of OER. The surface reconstruction with the formation of Co III OOH species reduces the R ct and favors the oxidation conversion of Ni II hydroxide into Ni III (oxy)hydroxide at a relatively lower applied potential. The co-existence of these high-valence-state metals (Co III and Ni III ) on the LDH surface further boosts the catalytic activity and enhances the OER performance. The OER activity of the Co x Ni-LDHs increases with increase of the Co: Ni ratio, and reaches the maximum as the Co:Ni ratio raises to about 1.8:1.0. The Co 1.8 Ni-LDH shows the most active OER catalyst with an overpotential of 290 mV at 10 mA cm −2 Geo and a Tafel slop of 66 mV dec −1 , as well as has a higher i ECSA and TOF. The carbon-free pasted Co 1.8 Ni-LDH electrode on Ni foam also exhibits excellent durability at 100 mA cm −2 in 1M KOH at room temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Zhihao Wu,Danyang Nan,Huan Yang,Shuang Pan,Hui Liu,Xiaoli Hu
A facile ratiometric fluorescence method for ascorbic acid (AA) detection was established by combining the fluorescence of MoS 2 quantum dots (QDs) with second-order scattering (SOS) of CoOOH. In MoS 2 QDs/CoOOH nanohybrid system, the fluorescence of MoS 2 QDs was quenched by CoOOH whereas the intensity of SOS was relatively close to the fluorescence due to the intrinsic high scattering ability of large size CoOOH nanoflakes . With the addition of AA, CoOOH nanoflakes were reduced to Co 2+ accompanied the size decline and the disappearance of characteristic absorption in UV–vis spectrum, resulting in the fluorescence recovery and SOS fading. Thus, the ratiometric detection of AA was obtained through the opposite changes of fluorescence and SOS. Under optimized conditions, the detection limit of AA was 0.21 μmol L −1 with a linear range from 0.80 to 32.0 μmol L −1 . Furthermore, the MoS 2 QDs/CoOOH nanohybrid system was applied to the detection of AA in human serum samples and vitamin C tablets with satisfactory results.
研究领域:
分析化学
·
生物医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Qihui Zhang,Dan He,Xinran Li,Wei Feng,Cong Lyu,Yifeng Zhang
Peroxymonosulfate (PMS) has gained attention as oxidant for SR-AOPs. It is essential to develop a stable heterogeneous catalyst with strong hydrophilicity and high electron transfer capability for PMS activating. In this study, cobalt oxyhydroxide (CoOOH) was synthesized and activated PMS for degradation of 2,4-dichlorophenol (2,4-DCP) aiming to assess the feasibility of CoOOH/PMS system. 50 mg/L of 2,4-DCP could be 100% degraded within 120 min with 0.20 g/L CoOOH and 6 mM PMS. CoOOH/PMS system possessed a high degradation efficiency (0.0462 min −1 ), which was about 10 and 4 times higher than Co 3 O 4 /PMS and CoFe 2 O 4 /PMS system, respectively. Furthermore, it was found that CoOOH/PMS system displayed effective catalytic performance over broad pH range (e.g. 3–9). Importantly, the quenching tests revealed that 1 O 2 was identified as dominant reactive oxygen species (ROS). Co (Ⅲ) was rapidly reduced to Co (Ⅱ) owing to the efficient electron transfer rate performance of CoOOH in the catalytic reaction. Then, the regeneration of Co (Ⅱ) facilitated CoOH + owing to the surface of CoOOH with sufficient hydroxyl group, which is crucial for PMS activation and reactive oxygen species-ROS generation. This study proposed an alternative technology based on peroxymonosulfate catalyzed by cobalt-based hydroxide for waste water treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 24
·8862
·
IF 3.748
Huihui Chen,Mei Yang,Jun Yue,Guangwen Chen
A facile and one-step route has been employed for the synthesis of highly uniform CoOOH nanorings assembled on the surface of reduced graphene oxide (CoOOH/rGO nanocomposite). The physicochemical properties of the obtained CoOOH/rGO nanocomposite were characterized using X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2physical adsorption (BET) and X-ray photoelectron spectroscopy (XPS). The TEM and SEM results confirmed that CoOOH nanorings (edge length ∼ 95 nm) were uniformly decorated on reduced graphene oxide nanosheets using the simple precipitation–oxidation–reduction method. When used as a catalyst for the reduction of p-nitrophenol to p-aminophenol in the presence of excess NaBH4, the resulting CoOOH/rGO nanocomposite exhibited good activity and stability. When the initial concentration of p-nitrophenol was 1.25 × 10−4mol·L−1, p-nitrophenol could be fully reduced within 3.25 min at room temperature. The apparent rate constant was estimated to be 1.77 min−1, which is higher than that of pure CoOOH nanorings. Moreover, p-nitrophenol could still be completely reduced within 6 min in the fifth successive cycle. The superior catalytic performance of the nanocomposite is attributed to the synergistic effect between the highly dispersed CoOOH nanorings and the unique surface properties of the reduced graphene oxide nanosheets, which greatly increased the concentration of p-nitrophenol near CoOOH nanorings on reduced graphene oxide surface and improved the local electron density at the interface.Keywords:cobalt oxide;reduced graphene oxide;nanorings;catalysis;p-nitrophenol;reduction
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 44
·4576-4582
·
IF 3.532
Yulong Ju,Qiukai Tang,Yiwen Yang,Yanbo Zeng,Yunyun Zhai,Hailong Wang,Zuguang Li,Lei Li
Highly sensitive and specific detection of cancer markers (such as carcinoembryonic antigen) is very important for early diagnosis and treatment of cancer. Herein, we developed a label-free fluorescent aptamer biosensor based on the aggregation-induced emission (AIE) effect and hydroxycobalt oxide (CoOOH) platform, and used it to detect carcinoembryonic antigen (CEA) with high sensitivity and specificity. Fluorescent ionic liquid Compound B can combine with a CEA aptamer (CEA-Apt) through electrostatic attraction and hydrophobic interaction to form an ionic liquid/aptamer (CEA-Apt/B) complex and produce the AIE effect, thereby enhancing the fluorescence intensity of B. CEA-Apt/B was adsorbed on the surface of CoOOH when CoOOH was added to the buffer solution, and the fluorescence of B was quenched. After adding CEA to the solution, CEA-Apt/B bound to CEA and separated from the surface of CoOOH because CEA-Apt had stronger affinity for CEA, resulting in fluorescence recovery of B. In the level range of 0.67–10000 pg mL−1, the fluorescence recovery intensity of the sensor had an excellent linear relationship with the level of CEA, and its LOD was 0.2 pg mL−1 (S/N = 3). In addition, the sensor had good selectivity and can be directly used to detect CEA in human serum with high accuracy.
研究领域:
分析化学
·
生物传感器
·
癌症诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Na Li,Yong Qing Zhong,Shi Gang Liu,Yong Qin He,Yu Zhu Fan,Jian Hua Hu,Xi Mai
Ascorbic acid (AA) is an important diet-derived antioxidant to human body. Thus, efficient and accurate detection of AA is of considerable significance in food analysis. Herein, smartphone assisted colorimetric and fluorescent triple-channel signal sensor has been developed for AA monitoring based on oxidase-like CoOOH nanoflakes . CoOOH nanoflakes can efficiently catalyze the oxidation of p -phenylenediamine (p-PD) into reddish brown p-PDox. The carbon dots (C-dots) are further introduced, of which the fluorescence can be quenched by p-PDox. However, in the presence of AA, the CoOOH nanoflakes is reduced and thus collapsed. As a result, the oxidation of p-PD is restrained, and thus the fluorescence of C-dots keeps strong. Based on AA induced light color, low absorbance, and strong fluorescence, triple-channel signal sensor has been proposed for AA determination. The AA assay shows a dynamic response range from 0.5 to 10 μM with a detection limit of 0.09 μM. The method assay allows detection of AA in real samples such as fruit juices. Combination with portable smartphone, the developed sensor is potential for AA determination in resource-poor settings.
研究领域:
食品科学
·
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jingyu Ren,Zhouzhou Yao,Qian Wei,Ruotong Wang,Yuan Liu,Long Wang,Kaibin Zheng,Shuai Wang,He Guo,Zhirui Niu,Jian Wang,Jin Han,Lei Lü,Yanzhong Zhen,Jie Li
Organic pollutants of olive mill wastewater (OMW) have caused various negative effect to water environments. It is imperative to develop an effective technology for eliminating organic pollutants in OMW. In this study, representative organic pollutants in OWM, ferulic acid (FA) and caffeic acid (CA), were removed from water by dielectric barrier discharge (DBD) plasma and Mn/CoOOH/activated carbon fiber (ACF) catalyst. The treatment performance and catalytic mechanisms were studied. The results show that the combined system could effectively remove FA and CA. For example, FA and CA degradation efficiency was 81.6% and 94.2% in the 20 L of mixed wastewater with the 100 min treatment using DBD combined with Mn/CoOOH/ACF. Experiments and density functional theory (DFT) calculations indicate that the electron transfer from the catalyst to antibonding orbits of O 3 and H 2 O 2 caused the dissociated adsorption, promoting the transformation of O 3 and H 2 O 2 to ·O, singlet oxygen and ·OH. Additionally, the doping of Mn in CoOOH benefited the electron transfer because Mn had a higher d-band center than Co in Mn/CoOOH, which was conducive to the interaction of O 3 and H 2 O 2 with the catalyst. The possible degradation pathways of FA and CA were proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Zhang Zhirong,Feng Chen,Wang Dongdi,Zhou Shiming,Wang Ruyang,Hu Sunpei,Li Hongliang,Zuo Ming,Kong Yuan,Bao Jun,Zeng Jie
The homogeneity of single-atom catalysts is only to the first-order approximation when all isolated metal centers interact identically with the support. Since the realistic support with various topologies or defects offers diverse coordination environments, realizing real homogeneity requires precise control over the anchoring sites. In this work, we selectively anchor Ir single atoms onto the three-fold hollow sites (Ir 1 /T O –CoOOH) and oxygen vacancies (Ir 1 /V O –CoOOH) on defective CoOOH surface to investigate how the anchoring sites modulate catalytic performance. The oxygen evolution activities of Ir 1 /T O –CoOOH and Ir 1 /V O –CoOOH are improved relative to CoOOH through different mechanisms. For Ir 1 /T O –CoOOH, the strong electronic interaction between single-atom Ir and the support modifies the electronic structure of the active center for stronger electronic affinity to intermediates. For Ir 1 /V O –CoOOH, a hydrogen bonding is formed between the coordinated oxygen of single-atom Ir center and the oxygenated intermediates, which stabilizes the intermediates and lowers the energy barrier of the rate-determining step.
研究领域:
催化
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
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
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xuan Zhu,Yan Liu,Menglin Wang,Li Zhang,Qiaoli Li,Entao Zhang,Hongfen Mo,Yuan Gao,Chenyu Xu,Yanwei Zhang
The synergistic coupling of light and heat in solar energy has attracted increasing research attention. In this work, both codoping and coloading were applied to SrTiO 3 -based catalysts to improve their solar photo and thermal conversion, respectively, and maximum productivities of 51.55 and 25.59 mmol·g −1 ·h −1 were achieved for H 2 and O 2 in photothermal synergistic water splitting. The yield of H 2 was nearly double that achieved via pure photocatalysis. In addition to many experiments and characterizations, DFT calculations were also performed to clarify the photothermal synergy. It was found that both the light absorbance and mobility of photoinduced carriers could be promoted by solar thermal effects in the material. Meanwhile, the energy barriers of the key steps were reduced with increasing temperature in the hydrogen production driven by solar photo effects. This work offers new ideas for designing catalysts for solar hydrogen production with photothermal synergistic strategies.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shihui Yin,Lirong Kong,Jiali Zhong,Yuebo Du,Na Zhang,GuoXing Zhu,Xiaoping Shen
The advancement of high-performance flexible supercapacitors has been fundamentally limited by the insufficient specific capacitance, inadequate cycling durability and low flexibility of traditional electrode materials. To address these issues, electrochemically converted CoOOH with high redox activity and hierarchical leaf/particle structure grown on carbon cloth (CC/CoOOH-LP) was fabricated through composition evolution of ZIF-67 precursors. By systematically deconvoluting the structure and critical phase-transition pathways governing electrochemical performance, the optimal pore hierarchy and phases was realized for CC/CoOOH-LP electrode, which exhibits high areal capacitance of 1515.1 mF cm −2 at 1 mA cm −2 with superior rate capability (retaining 940.1 mF cm −2 at 50 mA cm −2 ). The flexible asymmetric supercapacitor assembled from CC/CoOOH-LP and graphitic carbon nitride electrodes could achieve a high specific capacitance of 207.5 mF cm −2 at 5 mA cm −2 , stable performance upon mechanical bending and charge-discharge cycling (90.99 % capacitance retention over 5000 cycles). This work presents a rationally designed strategy for the preparation of electrochemically converted CC/CoOOH-LP electrode, which features a hierarchically porous structure, high flexibility and superior capacitive performance for flexible energy storage devices.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
·
柔性电子
✓ 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）