ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Guanglan Wang,Chengye Hua,Weixin Chen,Heliang Fan,Peizhong Feng,Yabo Zhu
The development of efficient and low-cost bifunctional catalysts for electrochemical water splitting is important for future sustainable hydrogen energy deployment. In this paper, a series of composition-controlled hybrid catalysts (Co 1.11 Te 2 /Te) were successfully constructed by introducing different proportions of Co source into the precursor solutions during the hydrothermal synthesis of Te nanosheets(Te NSs). The experimental results show that the content of Co 3+ active species in the hybrid materials can be adjusted by controlling the molar ratio of Co to Te, thereby significantly improving the electrocatalytic performance of the samples. Benefiting from the highest content of Co 3+ , the large specific surface area, and the great charge transfer ability, the Te-Co-3 electrode exhibited the best catalytic activity and durability among all samples. The hydrogen evolution reaction(HER) and oxygen evolution reaction(OER) overpotentials of the electrode were only 135 and 261 mV, respectively, to drive a current density of 10 mA cm −2 in an alkaline environment (1 M KOH). Furthermore, it required only a cell potential of 1.56 V to achieve overall water splitting at 10 mA cm −2 . This work should be useful for the design and preparation of non-noble metal bifunctional catalysts .
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Ying Yang,Kai Chen,Liang Huang,Min Li,Taiping Zhang,Mi Zhong,Ping Ning,Junya Wang,Shikun Wen
It has been reported that the addition of graphene oxide (GO) can increase the dispersion and heterogeneous nucleation of layered double hydroxide (LDH), thus providing more active sites, which is more conducive to CO 2 adsorption. Herein, we reported alkali metal nitrates ((Li 0.3 Na 0.18 K 0.52 )NO 3 ) promoted LDH and GO composites (LDH/GO) as adsorbents for CO 2 capture. The influence of mass ratio of LDH to GO, the impregnation ratio of alkali metal nitrates, the calcination and adsorption temperature, as well as the cycling stability were investigated systematically. The results indicated that the CO 2 capture capacity of LDH/GO composite with 30 mol% (Li 0.3 Na 0.18 K 0.52 )NO 3 could reach 4.51 mmol·g −1 , which was 5.86 times higher than LDH/GO1 without loading alkali metal nitrates. Moreover, it had outstanding CO 2 adsorption capacity in the range from 200 °C to 320 °C. In addition, the cyclic adsorption and desorption test manifested that the CO 2 uptake of the material can reach 3.07 mmol·g −1 after 22 cycles. We believe that this study will give a significant contribution to fabrication of LDH based composites as CO 2 adsorbents in future study.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2021
·Vol. 11
·期 11
·1214
·
IF 2.644
Shi Zhou,Yuebo Wang,Henry Teng
Carbonate mineralization is reasonably well-understood in the Ca–CO2–H2O system but continuously poses difficulties to grasp when Mg is present. One of the outstanding questions is the lack of success in dolomite MgCa(CO3)2crystallization at atmospheric conditions. The conventional view holds that hydration retards the reactivity of Mg2+and is supported by solvation shell chemistry. This theory however is at odds with the easy formation of norsethite MgBa(CO3)2, a structural analogue of dolomite, leading to the premise that crystal or molecular structural constrains may also be at play. The present study represents our attempts to evaluate the separate contributions of the two barriers. Crystallization in the Mg–Ba–CO2system was examined in a non-aqueous environment and in H2O to isolate the effect of hydration by determining the minimal relative abundance of Mg required for norsethite formation. The results, showing an increase from 1:5 to 6:4 in the solution Mg/Ba ratio, represented a ~88% reduction in Mg2+reactivity, presumably due to the hydration effect. Further analyses in the context of transition state theory indicated that the decreased Mg2+reactivity in aqueous solutions was equivalent to an approximately 5 kJ/mol energy penalty for the formation of the activated complex. Assuming the inability of dolomite to crystallizes in aqueous solutions originates from the ~40 kJ/mol higher (relative to norsethite) Gibbs energy of formation for the activated complex, a hydration effect was estimated to account for ~12% of the energy barrier. The analyses present here may be simplistic but nevertheless consistent with the available thermodynamic data that show the activated complex of dolomite crystallization reaction is entropically favored in comparison with that of norsethite formation but is significantly less stable due to the weak chemical bonding state.Keywords:norsethite;dolomite;transition state theory;activated complex;crystallization barrier;hydration
研究领域:
地质学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Wei Zhao,Shanshan Ruan,Siyu Qian,Beibei Feng,Chengcheng Ao,Lei Wang,Fuyi Liu,Lidong Zhang
Catalytic combustion has become a promising technology to address the accelerating volatile organic compounds (VOCs) emissions. In this work, cobalt modified ZSM-5 zeolite catalysts (3–18 wt % Co) were prepared to investigate the combustion of n-butane (one typical model component of VOCs). The performances of catalysts were evaluated by conducting experiments in a flow tube reactor. XRD, BET, FT-IR, and XPS were also utilized to characterize their physicochemical properties. A significant enhancement of the catalytic activity was demonstrated in terms of the cobalt supported over ZSM-5, with an optimal cobalt loading of 7 wt %. The excellent catalytic activity of 7 wt % Co-ZSM-5 is mainly attributed to a higher concentration of active surface Co3+ species. Furthermore, DFT calculations indicated that the role of Co can enhance the activity by decreasing the activation barriers for C–H bond cleavage. In addition, the primary reaction mechanism of n-butane combustion on Co-ZSM-5 was also revealed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Xinhua Zhao,Xiaxia Xing,Zhenxu Li,Yi Zhang,Zhu Zhang,Tingting Wang,Dachi Yang
In the emerging ammonia (NH3) economy, both olfactory and visual sensing are desired for leakage detection, in which olfactory sensing enables a fast response and wide detection range, while visual sensing ensures high selectivity. However, little is reported on the sensing material as a mediator to synergistically combine the dual-modality NH3 sensing. Here, Co3[Co(CN)6]2 microcubes (Co–CN MCBs) mediators have been developed for olfactory and visual dual-modality NH3 sensing. In olfactory sensing, porous chitosan-decorated Co3O4/Co3[Co(CN)6]2 microcages (CS@Co–O/Co–CN MCGs) have been obtained via [Co(CN)6]3–-governed self-assembly, glycerol-assisted reduction, and Kirkendall effect-driven hollowing. Beneficially, MCGs exhibit a 1 s fast response (500 ppm) and a 0.5–10,000 ppm wide detection range at room temperature. In visual sensing, colorimetric sensing paper (CSP) incorporated with anthocyanin, Co–CN, and poly(vinyl alcohol) has been achieved, which presents 10–320 ppm visual NH3 detection through a pink-to-brown transition. Further, highly selective NH3 sensing has been acquired through machine learning-powered classification of MCGs’ response and CSP’s specific NH3 chromogenic behavior. Notably, combining dual-modality sensing has achieved desired NH3 detection due to the boosted NH3 adsorption on Co–CN MCBs’ active sites and the synergistic effect of their-mediated heterostructures. Practically, our dual-modality sensing device has been integrated to detect NH3 with reliable responses.
研究领域:
材料科学
·
传感器与传感技术
·
环境监测
·
纳米材料
·
气体检测
·
机器学习应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Shuhua Li,Yaxing Li,Shilin Liu,Hao Ye,Yuxiu Wang,Yu Xie,Jiansheng Zhang
ZnIn 2 S 4 is a highly promising photocatalyst, but its rapid carrier recombination remains the core bottleneck. Constructing band-matched heterojunctions to promote charge separation is currently the most effective strategy to address this issue. Herein, a Co 3 (PO 4 ) 2 /ZnIn 2 S 4 (CPO/ZIS) type-II heterojunction photocatalytic system is designed. The intimate coupling between CPO and ZIS is achieved via electrostatic self-assembly. Studies show that this system follows a type-II charge transfer mechanism, and owing to the strong affinity of phosphate groups for protons in aqueous solution and the electron-trapping function of cobalt active centers, the hydrogen production efficiency is synergistically enhanced. The optimal 10-CPO/ZIS composite achieves a HER of 8.87 mmol g −1 h −1 , which is 8.53 times that of pristine ZIS, and also exhibits excellent photocorrosion resistance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yong-Chao Zhang,Caidi Han,Jian Gao,Jinting Wu,Xiao-Dong Zhu,Ji-Jun Zou
Electrocatalytic water splitting has received widespread attention. However, due to the slow reaction kinetics and complex electron transfer process, the oxygen evolution reaction (OER) occurring at the anode has become a bottleneck. Herein, the metal-defective Co 3- x O 4 was selected as the electron-acceptor carrier and Co 3- x O 4 /NiO was synthesized by a simple two-step method. The results show that Co 3- x O 4 /NiO has a low overpotential of 240 mV and 320 mV at 10 mA·cm −2 and 100 mA·cm −2 , a low Tafel slope of 64 mV/dec, and the electrochemical surface area (ECSA) of Co 3- x O 4 /NiO is as high as 1033.3 cm 2 . Moreover, the decrease in activity after the 60 h stability testing is negligible. Combining experiments and theoretical calculations, the high activity and stability of Co 3- x O 4 /NiO is attributed to the tunable electronic structure, and more electrons are transferred from NiO to Co 3- x O 4 which leads to the in-situ generation of more Ni 3+ as active sites. The Co 3- x O 4 /NiO with abundant of Ni 3+ can effectively regulate the oxygen-containing intermediates (OH*, O* and OOH*) with appropriate binding energy, reduce Gibbs free energy change of rate-limiting step, and accelerate OER reaction kinetics. This work provides an efficient strategy to generate and stabilize Ni 3+ active sites and confirms the key catalytic role of Ni 3+ in the OER process.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Yun-lei Zhong,Zhen-jiang Yu,Li-tong Wang,Tao Liang,Xuetong Zhang,Guo Hong
Lithium ion batteries are the most feasible energy storage technology for modern society. However, the electrochemical performance of commercial products is not satisfactory, which severely limits the development of electrode materials. An urgent call to balance the demands of high surface area, rich site activity, enhanced electrical conductivity, and controlled electrochemical stability becomes even more desired. In this work, we report a Co3O4 hexagonal prism (CHP) with a unique anisotropy structure as the anode material for lithium ion storage. Specifically, the CHP has a solid microframework on the six sidewalls and porous nanotunnels on the top and bottom surfaces, which not only enhances lithium ion storage and transmission but also provides sufficient electrochemical stability (i.e., minimize volume expansion). Additionally, it has much higher Co3+ contents and oxygen vacancies on all the surfaces which contribute to rich site activity and enhanced electrical conductivity. Based on these, the anisotropy CHPs show a remarkably higher initial capacity, excellent rate capability, and unique cycling stability than those of Co3O4 nanowires and commercial Co3O4 microparticles. The resulting CHP electrodes demonstrate an excellent reversible capacity of 800 mA h g–1 after 800 cycles at 1 A g–1. A further mechanistic study reveals the relationship between the material properties and the electrochemical performances, which can be mainly attributed to the synergistic effect of the anisotropy architecture, the surface pseudocapacitance, and the enriched Co3+ on the material surface. This synthetic strategy provides insights for the development of high-performance anodes.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Yubo Ge,Hualing Zhao,Guiqing Zhang,Qinggang Li,Shengxi Wu,Zhiyong Gao
In previous work, we developed an H 2 SO 4 -Fe 2 (SO 4 ) 3 roasting and water leaching method to leach rare earth elements (REEs), niobium (Nb), and titanium (Ti) from a low-grade concentrate mixture of the Baerzhe ore deposit in China ( Ge et al., 2024 ). However, conventional chemical precipitation and fluorine-ligand extraction methods for separating REEs/Nb/Ti in the leach solution face challenges, including co-precipitation of REEs and Nb/Ti, low recovery efficiency, and significant environmental concerns. To address these issues, a novel two-step solvent extraction process for efficient separation and recovery of Nb and Ti from leach solution was proposed in this work. The quaternary ammonium salt extractant (N263-CO 3 2- ) was employed to selectively co-extract Nb and Ti from the leach solution for achieving effective separation them from REEs. The resultant Nb(OH) 5 /Ti(OH) 4 precipitates were dissolved in H 2 C 2 O 4 -H 2 SO 4 mixture for selective extraction of [NbO(C 2 O 4 ) 2 - ] using tri-n-octylamine (TOA). The extraction mechanism confirmed that N263 preferentially extracts Nb/Ti via anion exchange, with the primary contribution from N263-CO 3 2- to Nb/Ti extraction, followed by N263-SO 4 2- , while protonated TOA selectively extracts [NbO(C 2 O 4 ) 2 - ] through anion–cation association. Ultimately, the recovery efficiencies of Nb and Ti reached 96.0 % and 69.0 %, respectively, producing Nb 2 O 5 (99.6 %) and TiO 2 (99.2 %), with REEs losses < 0.5 %. This study offers a novel approach for the efficient selective separation and recovery of Nb/Ti from leach solution.
研究领域:
冶金学
·
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Jiang Zi-Min,Xu Ting-Ting,Yan Cong-Cong,Ma Cai-Yun,Dai Shu-Ge
Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Shiwei Liang,Xingcan Qian,Tianxin Zhang,Guiqin Song,Bing Wang,Yongsheng Yang,Xiansong Yang,Danyang Lin,Xiu He,Long Zou
Regulating the valence states and composition of a catalyst surface allows a precise control of the electronic structure, enabling enhanced catalytic activity and improved detection sensitivity of sensors. Herein, an accurate quantification of hydrogen peroxide (H 2 O 2 ) has been achieved using a colorimetric and electrochemical sensing platform based on the catalytic activity of cobalt@nitrogen-doped carbon (Co@NC) nanocatalysts in acidic (pH 3.6) and neutral (pH 7.4) environment. A series of Co@NC samples were synthesized by electrospinning and subsequent calcination, where Co@NC-3 with a high Co 3+ /Co 2+ potential (1.92 V) facilitates the direct oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) under acidic conditions. In the presence of H 2 O 2 , TMB oxidation was inhibited due to cyclic reactions involving oxidized TMB and H 2 O 2 on the Co@NC-3 surface, with an associated loss of the blue coloration that is detectable by the naked eye and is quantified by UV–vis spectrometry with a detection limit of 40.5 μM. Moreover, the Co 3+ /Co 2+ redox cycle on the surface of the Co@NC-3 modified glassy carbon electrode resulted in enhanced electrocatalytic H 2 O 2 reduction in a neutral phosphate buffered saline, where the amperometric currents exhibited a linear response to H 2 O 2 concentration over the 0.05–27.6 mM range with a detection limit of 3.16 μM, and an enhanced sensor sensitivity (991 μA mM −1 cm −2 ). The proposed Co@NC-3 detection system has been applied to real-time measure the concentration of H 2 O 2 released from HeLa cells. The colorimetric and electrochemical sensing analysis delivers reliable detection efficiency with important practical applications in clinical analysis and diagnosis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hong Xiao,Qi Zhang,Munir Ahmad,Shanshan Dong,Yanzong Zhang,Dexin Fang,Xiaojing Wang,Hong Peng,Yongjia Lei,Ganxue Wu,Yanfu Bai,Shihuai Deng,Fei Ye,Zhenxing Zeng
Inspired by the important role of the manganese enzyme in photo-induced hole transfer of natural photosynthesis, we have developed an innovative carbonate-mediated-hole-transfer strategy for boosting the photocatalytic degradation of organic pollutants. We found that the carbonate species can effectively extract the photo-generated hole in the valence band of carbon nitride to generate · CO 3 − and leaves electron in the conduction band for oxygen reduction to generate · OH. The generated · CO 3 − can be returned to its pristine state of CO 3 2− via the oxidation of organic pollutants. The unique · CO 3 − /CO 3 2− shuttle could largely improve the charge separation via the fast hole extraction that leads to enhanced · OH generation for accelerating the photocatalytic degradation of organic pollutants. As expected, the as-prepared carbon nitride exhibits markedly enhanced photocatalytic performance toward formaldehyde, p-chlorophenol, and phenol degradation than the one without carbonate as additive. The conceptual study demonstrated here may offer new viewpoints in designing high-efficient photocatalytic systems for environmental applications.
研究领域:
环境科学
·
材料科学
·
光化学
✓ 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）