Small
·
2024
·
IF 13
Yingyan Ma,Yuan Ha,Liangqiang Chen,Ziqi An,Linzhuang Xing,Zhenni Wang,Zhimin Li
Efficient and affordable price bifunctional electrocatalysts based on transition metal oxides for oxygen and hydrogen evolution reactions have a balanced efficiency, but it remains a significant challenge to control their activity and durability. Herein, a trace Ru (0.74 wt.%) decorated ultrathin CoOOH nanosheets (≈4 nm) supported on the surface of nickel foam (Ru/CoOOH@NF) is rationally designed via an electrochemically induced strategy to effectively drive the electrolysis of alkaline overall water splitting. The as-synthesized Ru/CoOOH@NF electrocatalysts integrate the advantages of a large number of different HER (Ru nanoclusters) and OER (CoOOH nanosheets) active sites as well as strong in-suit structure stability, thereby exhibiting exceptional catalytic activity. In particular, the ultra-low overpotential of the HER (36 mV) and the OER (264 mV) are implemented to achieve 10 mA cm −2 . Experimental and theoretical calculations also reveal that Ru/CoOOH@NF possesses high intrinsic conductivity, which facilitates electron release from H 2 O and H-OH bond breakage and accelerates electron/mass transfer by regulating the charge distribution. This work provides a new avenue for the rational design of low-cost and high-activity bifunctional electrocatalysts for large-scale water-splitting technology and expects to help contribute to the creation of various hybrid electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Liang Yan,Bing Zhang,Zhonggang Liu,Junlu Zhu
The development of highly active and low-cost oxygen evolution reaction (OER) electrocatalysts is pivotal for the efficient generation of renewable hydrogen but still challenging. Heteroatom doping and oxygen vacancy (Ov) engineering are effective strategies to regulate the physical and chemical properties of the catalysts and thus facilitating the intermediates absorption/desorption. Herein, the rational design of Cu doping CoOOH porous nanoplates with rich Ov grown on carbon fiber paper (Cu-CoOOH/CFP) is performed to enhance the OER performance. Experiment results and density functional theory (DFT) calculations uncovered that the synergistic effect of Cu doping with Ov exceptionally modulated the electronic structure of Cu-CoOOH/CFP so that enormously facilitates the (O–H)* bond cleavage and optimize the Gibbs free energies of OER intermediates, thus contributing to fast kinetics and outstanding OER activity. As expected, the optimized three-dimensional (3D) self-supported Cu-CoOOH/CFP with unique porous structure shows unprecedented OER activity with a low overpotential of 234 mV to attain a current density of 10 mA cm −2 , as well as superior stability in 1.0 M KOH. This work provides an effective electronic engineering approach for the rational design of nonprecious-metal and efficient electrocatalysts for water oxidation and beyond.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xiaoyi Zhao,Ke Yang,Yu Gong,Jiayi Wang,Zhongjun Chen,Xueqing Xing,Zhonghua Wu
The formation and self-assembly mechanisms of nanomaterials are of great significance for the preparation and application of materials. In this study, the orientationally aggregated CoOOH nanosheets and the self-assembled strings of CoOOH nanodiscs were prepared by hydrothermal method. The formation and self-assembly mechanisms of CoOOH nanodiscs were investigated by XRD, XPS, DLS, TEM, and SEM techniques, as well as DFT calculations. The results show that the formation process of the stacked CoOOH nanodiscs was driven by surface energy and can be divided into four steps: nucleation and growth of CoOOH primary nanosheets; oriented attachment of CoOOH nanosheets; self-assembly of CoOOH nanodiscs; and aggregation of strings of CoOOH nanodiscs. This study contributes meaningfully to the controllable preparation of CoOOH nanomaterials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuo Li,Yahui Li,Juan Zhang,Xiutao Liu,Kaixin Zhang,Yu Zhang,Xi-ming Song
A CoOOH cocatalyst overlayer is electrochemically deposited on the BiVO 4 surface, and thermal annealing converted CoOOH to Co 3 O 4 in situ. The primary difference between the two cocatalysts lies in their electrolyte permeabilities, resulting in significant differences in their thermodynamic effects on enhancing the photoelectrochemical water oxidation performance. We proved that the CoOOH cocatalyst is unable to achieve true chemical passivation of the surface states of the BiVO 4 photoanode, whereas the Co 3 O 4 cocatalyst can chemically passivate the surface states. Nevertheless, the CoOOH cocatalyst still exhibits better water oxidation performance than Co 3 O 4 , which is attributed to the fact that the permeable CoOOH cocatalyst can accumulate more photogenerated holes in the bulk phase and provide more active sites. However, the CoOOH cocatalyst still exhibits better water oxidation performance compared to Co 3 O 4 , which is attributed to the permeable CoOOH cocatalyst can accumulate more photogenerated holes in its bulk phase and offer more active sites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Bin Zhu,Chunlin Chen,Liyuan Huai,Zhenqiang Zhou,Lei Wang,Jian Zhang
Simultaneous production of value-added 2,5-furandicarboxylic acid (FDCA) and H 2 from the integrated 5-hydroxymethylfurfural (HMF) oxidation and hydrogen evolution reaction by electrocatalysis has drawn tremendous attention due to the significantly improved energy efficiency. However, HMF is not thermally and chemically stable enough to often cause heavy degradation, impeding its storage and industrialization. In this work, a more stable furan molecule, 2,5-bis(hydroxymethyl)furan (BHMF), was employed as the reaction substrate into the coupling system for the first time. By means of facile electrodeposition and subsequent oxidative activation, the standing CoOOH nanosheet electrocatalyst was fabricated to realize a complete BHMF conversion with 90.2 % FDCA yield and 100 % current efficiency for H 2 evolution. The reaction path and apparent activation energies were therefore discussed. Scalable properties and electrochemical durability of CoOOH were evaluated in a continuous flow reactor to harvest gram-level solid FDCA, highlighting the prospect of green coupling electrolysis for industrial application.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Botao Fan,Hao Zhang,Bang Gu,Feng Qiu,Qiue Cao,Wenhao Fang
Electrocatalytic conversion of renewable biomass is emerging as a promising route for sustainable chemical production; hence it urgently calls for developing efficient electrocatalysts with low potentials and high current densities. Herein, a Pr-doped Co(OH) 2 hexagonal sheet (Pr/Co = 1/9, in mole) is synthesized by electrodeposition as highly performant catalyst for 5-hydroxymethylfurfural (HMF) oxidation reaction (HMFOR) to produce 2,5-furandicarboxylic acid (FDCA). This novel and low-cost catalyst possesses a rather low onset potential of 1.05 V (vs. RHE) and requires only 1.10 V (vs. RHE) to reach a current density of 10 mA cm −2 for HMFOR, significantly outperforming Co(OH) 2 benchmark (i.e., 210 mV higher to reach 10 mA cm −2 ). The origin of Pr promotion effect as well as the evolution of CoOOH catalytic sites and HMFOR process has been deeply elucidated by physical characterizations, kinetic experiments, in situ electrochemical techniques, and theoretical calculations. The unique Pr-ameliorated CoOOH active centers enable 100% conversion of HMF, 99.6% selectivity of FDCA, and 99.7% Faraday efficiency, with a superior cycling durability toward HMFOR. This can be one of the most outstanding results for Co-based HMFOR catalysts to date in the literature. Thereby this work can help open up new horizons for constructing novel and efficient Co-based electrocatalysts by the utilization of lanthanide elements.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 8
·1-7
·
IF 2.175
Cui Hongtao,Zhao Yunan,Ren Wanzhong,Liu Yan,Wang Minmin
First aqueous non-silica foams, solely stabilized by CoOOH nanoparticles, were prepared by a new colloidal strategy. Highly water-soluble CoOOH nanoparticles with size of 1.5 nm were produced from the reaction between Co(OH) 2 nanosheets and ammonia. The foams were formed through the hand-shaking of the high-concentration colloid formed by the redisolving of CoOOH nanoparticles in water. The stability of the foams was attributed to the reduction of surface tension induced by the hydrophilic CoOOH particles and the support of particulate network in the void between bubbles. These two factors also provided resistance for the bubble collapse during the evaporation of solvent, resulting in the keeping of the original foam morphology after drying and the formation of a hierarchically hollow structure of CoOOH. Herein, we proved that the highly hydrophilic nanoparticles also can stabilize liquid foams. This conclusion is different from the classic theory on foams, which may provide new insight for foams and also a pathway for the preparation of inorganic hollow structure.
研究领域:
材料科学
·
纳米技术
·
胶体化学
·
结构功能材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Heng Zhang,Zhen Wang,Xiaoqing Yang,Zi-Long Li,Linhao Sun,Jimei Ma,Hong Jiang
A sensitive nanocomplex probe prepared from fluorescent polydopamine nanoparticles (F-PDA) and cobalt oxyhydroxide (CoOOH) nanosheets was established for the determination of α-glucosidase activity. In this detection system, the fluorescence of F-PDA was firstly quenched by CoOOH nanosheets based on fluorescence resonance energy transfer (FRET). Subsequently, ascorbic acid was produced from 2-O-α- d -glucopyranosyl- l -ascorbic acid which was selectively hydrolyzed by α-glucosidase. CoOOH was reduced to Co 2+ by the released ascorbic acid, which resulted in the recovery of F-PDA nanoparticles fluorescence. In consequence, α-glucosidase activity was determined by the fluorescence recovery degree of the F-PDA nanoparticle. This fluorescent method showed a good linear relationship with the activity of α-glucosidase from 2 to 80 U L −1 and low detection limit of 1.65 U L −1 (S/N = 3). This fluorescence probe with high selectivity and sensitivity demonstrated a remarkable applicability in human serum samples and provided an alternative for α-glucosidase inhibitors screening in the discovery of anti-diabetes drugs.
研究领域:
生物化学
·
医学检测
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-7
·
IF 5.479
Zhang Limei,Qin Ju,Yang Qiang,Wei Siqi,Yang Rui
Carbon dots (CDs) were hydrothermally prepared from gelatin as the sole precursor. The CDs were hybridized with CoOOH nanosheets (NSs) to obtain a fluorescent probe (CD-CoOOH) for ascorbic acid (AA). The blue luminescence of the CDs, with excitation/emission maxima of 350/443 nm, is quenched by the NSs. If the NSs are reduced to Co 2+ by addition of AA, the CD-CoOOH hybrid is disintegrated and fluorescence recovers. The hybrid nanoprobe has a linear response in the 0.8–12.5 μM and 12.5–690 μM AA concentration ranges and a 0.025 μM limit of detection. Compared to previously reported methods for detecting AA, this methods has a wider linear range and a lower detection limit. The nanoprobe was utilized to quantify AA in spiked human serum samples and gave satisfactory results. The strategy was also applied to the construction of an “AND” logic gate, which avoided perplexed material decorations and chemical tracking.
Scheme 1. Schematic illustrations of the preparation of CDs and of the working principle for determination of ascorbic acid (AA).
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 40
·4951-4957
·
IF 2.073
Zhi Yuan Mao,Lu Ning Zhu,Jie Gao,Jia Jun Liu,Yin Hui Wei,Xin Yu Li,Bin Cheng Yin,Jian Wang
As a major metabolic product of purine nucleotides, uric acid (UA) usually presents in urine and serum, which is closely related to human health. With the catalysis by uricase, uric acid can yield allantoin, CO2 and H2O2. Then, the produced H2O2 is able to decompose CoOOH nanoflakes into Co2+, resulting in a smaller size with weakened light scattering. This work provides a simple and selective light scattering method for UA analysis with a linear range from 1.0 × 10−5 to 1.0 × 10−3 M and a detection limit of 1.0 × 10−6 M. In addition, this method has been successfully applied to the determination of UA in human serum samples with similar results to clinical methods.
研究领域:
分析化学
·
医学诊断
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Songbo Wang,Yidan Wang,Jia Li,Shuang Guo,Chengzhen Meng,Lun Pan,Ji-Jun Zou,Yawei Shi,Lei Zhang,Zhen Yin,Na Tang
In order to address the current energy and environmental challenges, photoelectrochemical (PEC) water splitting has been widely studied, and the key point about the efficient PEC process is how to develop highly active photoanode catalysts. In this article, we report a two-step hydrothermal and electrodeposition approach to prepare a cobalt (oxy)hydroxide (CoOOH)-modified Ti-Fe2O3-In2O3 electrode by synergy of electron modulation and a heterojunction structure for promoting PEC water splitting. Under a bias of 1.23 V vs RHE, the optimized Ti-Fe2O3-In2O3/CoOOH photoanode demonstrated remarkable photocurrent density and hydrogen evolution rate as high as 1.33 mA cm–2 and 22.8 μmol cm–2 h–1, which was 5.11-fold and 5.14-fold that of bare α-Fe2O3, respectively. Characterization results indicate that Ti-doping will alter the electronic structure and improve the charge carrier density, whereas the construction of a heterojunction can realize the spatial separation of charge carriers. Meanwhile, the outer CoOOH ultrathin layer can provide a large amount of oxygen evolution reaction sites and promote the surface reaction. This work suggests that the PEC performance of Fe2O3-based photoanodes can be improved effectively by the synergy of electronic modulation and heterojunction construction.
研究领域:
能源与环境科学
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 26
·10061-10068
·
IF 4.569
Congli Wang,Hongfang Jiu,Lixin Zhang,Wei Song,Yufang Zhang,Hao Wei,Qianwen Xu,Yaqi Qin,Sicong Che,Zhixin Guo
It is of utmost importance to explore bifunctional electrocatalysts for water splitting. Herein, unique ZnCo2O4–CoOOH heterostructured ultrathin nanosheets on Ni foam are reported that combines a two-step hydrothermal method. This catalyst exhibits excellent catalytic performances to achieve a current density of 10 mA cm−2 with an ultralow overpotential of 115 mV for HER, attaining an overpotential of 238 mV at 20 mA cm−2 for OER. Remarkably, ZnCo2O4–CoOOH/Ni shows a voltage of 1.494 V to drive a current density of 10 mA cm−2. Such performances are due to the inter-penetrative pores present in the ultrathin nanosheets that provide large surface areas and expose massive active sites to enhance activities. In addition, the unique nanosheet structure and the 3D Ni foam substrate possess large specific surface areas, which can facilitate mass diffusion. This excellent performance is ascribed to the ZnCo2O4–CoOOH heterostructure that manipulates strong synergy to improve the electrochemical activity. This study offers new insight on an innovative approach for the exploitation of effective bifunctional electrocatalysts with a heterostructure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）