ENERGY & FUELS
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2026
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IF 6
Qi Gao,Shuai Liu,Japan Trivedi,Emanuel X. Ricky,Xingguang Xu
In fractured reservoirs, strong heterogeneity often promotes early CO2 breakthrough along dominant flow paths, significantly reducing sweep efficiency and oil recovery. A staged injection strategy combining a CO2-responsive gel (CRG) and a CO2-responsive foam (CRF) can synergistically seal high-permeability channels and enhance displacement efficiency. In this work, two CRGs (CR-DDN and CR-DAN) were synthesized via free-radical polymerization of N-(3-(dimethylamino)propyl)methacrylamide, acrylamide, N,N-dimethylacrylamide, and N-vinylpyrrolidone. At 80 °C, their swelling ratios reached 39 and 30 °C after CO2 exposure, respectively. Rheological analysis and SEM imaging indicated that the layered-stacking morphology of CR-DDN provided greater structural integrity than the irregular sponge-like network of CR-DAN. Correspondingly, at 80 °C, the elastic modulus of CR-DDN (3518 Pa) was approximately 3.5 times that of CR-DAN (993 Pa). Core-scale EOR tests in artificial fractured cores treated with CR-DDN showed that the gel not only restricted gas mobility by sealing fractures but also contributed to residual oil mobilization through its viscoelastic properties, yielding incremental recoveries of 14.5%–25.5% during gel injection depending on matrix permeability. Incorporating CRF further enhanced the CO2-breakthrough control. Compared with coinjection, two surfactant-alternating-gas (SAG) cycles established a more sustained resistance plateau and increased the ultimate recovery to 76.91%. These findings provide guidance for designing robust CRGs and demonstrate the potential of staged foam-gel treatments to enhance the CO2 flooding performance in fractured reservoirs.
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Surfaces and Interfaces
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2026
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IF 6
Xinxiong Wang,Yunpeng Liu,Aiting Xu,Qiao Zhang,Guangxing Yang,Lianpeng Tong,Feng Peng
The conversion of CO 2 into value-added chemicals using solar energy represents an ideal pathway to address the energy and environmental crises. However, the application of photocatalytic CO 2 reduction is still being hindered by the low CO 2 mass transfer and rapid charge carriers’ recombination. In this study, a Ga 2 O 3 /La 2 O 2 CO 3 composite heterojunction (GaO/LaOCO) with a surface rich in La(OH) 3 was constructed, successfully achieving both enhanced CO 2 adsorption and charge-separation efficiency. The composite undergoes a surface reconstruction of La(OH) 3 to La 2 (CO 3 ) 3 , resulting in a surface CO 3 2− layer that is conducive to CO 2 chemical adsorption and activation. In addition, band structure analysis confirms the formation of an energy-level alignment favorable for directional charge transfer. Under simulated sunlight, the prepared composite exhibits optimal photocatalytic CO 2 reduction activity without sacrificial agents and photosensitizers, achieving a CO production rate of 15.33 μmol g −1 over 5 h, along with good cycling stability. This enhanced activity originates from the synergy between surface La(OH) 3 for CO 2 enrichment/activation and Ga 2 O 3 for efficient electron transport. This work provides a strategy for enhancing photocatalytic CO 2 reduction performance by tailoring catalyst surface properties and interfacial structures.
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Small Methods
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2026
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IF 8.7
Xiaochen Feng,Zihao Huang,Mingwei Fang,Meiling Wang,Jinyue Ma,Zewen Wang,Ying Zhu,Lei Jiang
Electrochemical CO 2 reduction (CO 2 RR) to ethanol offers a sustainable route for carbon utilization and energy storage, yet achieving high ethanol selectivity under limited CO 2 availability remains a significant challenge. The central issue is the lack of quantitative understanding of how the interfacial * CO and * H intermediates jointly govern product selectivity. Here, we establish an interfacial coverage regulation strategy by embedding Cu nanoparticles into an imine-functionalized covalent organic framework (Cu/Im-COF). The imine-rich interface enriches CO 2 adsorption while modulating proton transfer, enabling a balanced surface coverage of * CO and * H, identified as the key selectivity descriptor ( θ *CO/*H ) for ethanol formation. Operando Raman spectroscopy, density functional theory calculations, confirms that an optimized θ *CO/*H stabilizes the * HCCHOH intermediate and lowers its formation barrier. Quantitative integration of Raman features allows direct determination of θ *CO/*H , revealing a volcano-type dependence of ethanol selectivity on this descriptor. A maximum ethanol Faradaic efficiency of 56% is achieved at log( θ *CO/*H ) ≈ 3.0, a current density of 700 mA cm − 2 , and a 15% CO 2 feed. This work establishes θ *CO/*H as a quantitative bridge between intermediate coverage and reaction kinetics, providing a mechanistic framework for rational design of CO 2 RR catalysts with high ethanol selectivity under CO 2 -constrained conditions.
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PubMed
高影响因子
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
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2024
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IF 1.4
Xueting Liu,Kuayue Li,Wenkui Liu,Peng Cui,Fengyu Wei
The multiphase catalysts DMSNs-Cb-X containing NHC-CO2 adducts were synthesized by soft template method that is, first preparing dendritic multi-model pore silica nanoparticles (DMSNs) with central-radial structure, and then grafting imidazoline functional groups, and finally allowing to react with dimethyl carbonate to graft NHC-CO2 adducts. The investigations had the scope to improve the performance and to elucidate the effect of NHC-CO2 adducts on the CO2 cycloaddition reaction. The optimum catalyst DMSNs-Cb-1 and the optimum reaction conditions (200 mg, 100 °C, 10 h) were obtained via thermogravimetric analysis. CO2 cycloaddition reaction with epoxide DMSNs-Cb-1 can convert CO2 and epoxide to cyclic carbonate at ambient pressure without solvent and co-catalysts (1 bar, 100 °C). The reaction proceeds with high yield and high conversion frequency (TOF = 27.4 h−1). The prepared catalyst is easily recovered and still has high activity after five cycles of experiments. The excellent catalytic performance of the obtained catalyst can be attributed to the synergy of hierarchical porous structure and NHC-CO2 adducts acting as CO2 adsorption sites as well as zwitterionic catalytic sites. This work demonstrates an efficient strategy for green conversion of CO2 into cyclic carbonates.
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FUEL
·
2026
·
IF 7.5
Xuanyu Lin,Yiming Qin,Xinyu Feng,Hanzhen Liu,Zhenhang Lu,Xin Tang
CO 2 as a rich source of carbon can provide an alternative route to produce value-added chemicals. Electrocatalysis is one of the most promising approaches to convert CO 2 captured from the atmosphere into valuable chemicals. However, the CO 2 molecule is relatively stable and requires a large amount of energy to activate CO 2 for conversion. We develop a new creative type of solid-state CO 2 fuel cell that can generate high-value-added chemicals through electrochemical reduction of CO 2 without external electrical energy input while achieving self-power generation, operating in the medium temperature range of 400–700 ℃. This study demonstrates a fuel cell operating at 570 °C, which achieves a current density of 686.0 A·m −2 and a power density of 98.8 W·m −2 . Under these conditions, the fuel cell achieved a product formation rate of 140.0 μmol·g cat −1 ·h −1 . The system’s operational parameters enable its integration into combined heat and power (CHP) generation, simultaneously facilitating CO 2 conversion, thereby aligning with sustainable energy and emissions reduction strategies.
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Science Advances
·
2025
·Vol. 11
·期 48
·
IF 12.5
Wenbo Liu,Lu Li,Menggang Li,Zongqiang Sun,Youxing Liu,Shaojun Guo
Mg-CO 2 battery has emerged as a promising battery technology by harnessing greenhouse gas as an active material. However, its development is greatly hindered by sluggish CO 2 conversion kinetics, resulting in high overpotentials and poor reversibility. Herein, we report a class of 2,2,6,6-tetramethylpiperidoxyl (TEMPO) homogeneous catalyst to regulate CO 2 adsorption and optimize reaction pathways through a quantum tunneling effect induced by electron transfer from the TEMPO free radical to CO 2 that classical electron transfer mechanisms cannot overcome. This quantum tunneling effect not only enables CO 2 reduction at lower voltage but also regulates the CO 2 adsorption environment, leading to the alternated reaction pathway for the formation of flower-like MgC 2 O 4 as the discharge product, rather than the dense MgCO 3 typically formed in traditional models. The TEMPO-based Mg-CO 2 batteries achieve an exceptional discharge voltage of 1.1 volts and a charge voltage of 1.3 volts, with stable cycling performance for over 450 hours, representing the best-reported performance among Mg-CO 2 battery systems to date.
研究领域:
电化学
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储能
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量子化学
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催化
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材料科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Huahao Wang,Yaping Ding,Mengjia Ning,Miao Yu,Wenji Zheng,Xuehua Ruan,Yuan Xi,Yan Dai,Hongjing Liu,Gaohong He
Metal organic frameworks (MOFs) with appropriate pore size and sufficient CO 2 -philic groups are required to improve the mixed matrix membranes (MMMs)-based CO 2 capture. Herein, NH 2 -CPL-1 is designed for capture by utilizing amino pyrazine instead of pyrazine in CPL-1. The introduced CO 2 -philic amino groups together with rich hydroxyl and carboxyl groups in CPL-1 could improve the selective adsorption of CO 2 , enhancing the solubility selectivity. At the meantime, after the introduction of amino-functional, the pore size of NH 2 -CPL-1 is decreased from 0.93 nm of CPL-1 to 0.85 nm, which is beneficial for the screening of CO 2 over N 2 . As a result, the CO 2 separation performances of MMMs could be promoted greatly under the action of NH 2 -CPL-1. MMM with NH 2 -CPL-1 of 10 wt.% exhibited the best CO 2 separation performance, with CO 2 /N 2 selectivity of 85 and CO 2 permeability of 104 Barrer at 25 °C and 0.4 MPa. Compared with the CPL-1/Pebax-10 wt.% MMM, it was increased by 9.5 % and 13.3 %, respectively. This satisfactory CO 2 separation performance surpasses those of most reported other MOFs based MMMs, which is attributed to the facilitated CO 2 transport and pore size screening from the introduced amino groups. This is also confirmed by the improvement of diffusion selectivity and solution selectivity. The proposed NH 2 -CPL-1 shows great prospect as filler for enhanced MMMs-based CO 2 capture.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 15
·4519-4525
·
IF 7
Chaoran Wang,Xiao Li,Shiyue Liu,Tingting Wang,Puxu Liu,Xiaowei Song,Zhiqiang Liang
Silicoaluminophosphate (SAPO) zeolites with small pores (8-ring window), such as SAPO-34, SAPO-17, and SAPO-RHO, have attracted a lot of attention due to their unique structural features, and their applications in the field of small-molecule gas adsorption and separation. However, the fast, efficient and green synthesis of SAPO zeolites remains a great challenge. In this work, SAPO-17 zeolites were synthesized within 1 min for the first time by a seed-assisted microwave method, and the resulting samples possessed excellent performance in the application of CO2 adsorption and separation for flue gas and natural gas. The microwave-assisted route can shorten the crystallization time of traditional hydrothermal methods from a few hours to 30 min. Furthermore, the crystallization time could be drastically shortened to 1 min with the addition of seeds, which represents the shortest time for the preparation of a SAPO-17 zeolite up to now. SAPO-17 synthesized within 1 min (SAPO-17-S-1) possessed the smallest crystal size, and the largest micropore volume and specific surface area among all the samples, which enhanced mass transfer and exposed more active sites, and thus it possessed prominent performance for CO2 adsorption (3.47 mmol g−1 at 273 K and 1 bar) and gas separation. At 298 K and 100 kPa, SAPO-17-S-1 exhibited the highest gas selectivity for CO2/N2 (276) and CO2/CH4 (63) over the other samples, which were synthesized in a relatively long time. Transient binary breakthrough experiments on SAPO-17-S-1 further verified the highly-efficient gas separation performance. This work proposes a green and ultrafast strategy for the synthesis of SAPO-17 zeolites with highly selective CO2 adsorption over N2 and CH4.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Changyang Liu,Shuting Li,Jianquan Gao,Liuzhen Bian,Yunting Hou,Lijun Wang,Jun Peng,Jinxiao Bao,Xiwen Song,Shengli An
The development of cathode materials with high catalytic activity and low cost is a challenge for CO2 electrolysis based on solid oxide electrolysis cells. Herein, we report a low-cost and highly active metallic Fe nanoparticle-decorated Ruddlesden-Popper (La, Sr)FeO4+δ cathode catalyst (Fe-RPLSF), which shows a high oxygen vacancy concentration and robust CO2 reduction rate. At 850 °C, the current density of the electrolysis cell with the Fe-RPLSF cathode reaches −1920 mA cm–2 at a voltage of 1.5 V, and the Faraday efficiency is as high as 100%. The polarization resistance at low frequency (0.1–10 Hz), which is the rate-limit step for CO2 electrolysis, significantly decreases with the exsolved Fe nanoparticles because of improved CO2 dissociative adsorption. Moreover, our electrolysis cell demonstrates acceptable short-term stability for direct CO2 electrolysis.
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Materials Today Communications
·
2021
·
IF 3.383
Yuanting Qiao,Zhen Zhan,Yuwan Yang,Manying Liu,Qi Huang,Bien Tan,Xuebin Ke,Chunfei Wu
Hypercrosslinked polymers (HCPs) are very promising for large-scale applications due to their easy preparation, high thermal stability, and good capability of CO 2 capture. Currently, many amine-functionalized porous materials are prepared through two steps. In this paper, the amine-functionalized HCPs was obtained with a one-step method and it showed a high CO 2 adsorption up to 4.24 mmol/g at 273.15 K. In addition, since the azo-functionalized porous materials have many potential applications like the photoresponsive ‘smart’ materials, azobenzene is an attracting functional group for the development of porous materials. Herein, the azo-functionalized HCPs is firstly reported, and it is used as CO 2 adsorbents (3.02 mmol/g at 273.15 K) performing good CO 2 /N 2 selectivity (34.52 at 298.15 K).
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Energy Storage Materials
·
2019
·
IF 0
Feilong Qiu,Siyun Ren,Xiaowei Mu,Yijie Liu,Xueping Zhang,Ping He,Haoshen Zhou
Rechargeable Li–CO 2 batteries are very attractive energy storage devices because of their high theoretical energy density and unique CO 2 capture capability. Unfortunately, Li metal anode is unstable to the widely used ethers-based electrolytes, and the related Coulombic efficiency is low. Here, in the ethers-based electrolyte, the effects of CO 2 to the Li metal anode was studied. Using a porous electrode , the reduced CO 2 will be replenished from outside upon cycling. We found that, sufficient CO 2 contributed to the formation of stable solid electrolyte interface (SEI) layers and protected the Li metal anode from rapid consumption. Under a current density of 1.0 mA cm −2 , the Coulombic efficiency of Li metal reached 99.0% after 200 cycles. Our work helps the researchers better understand the effects of CO 2 crossover on anode and also provides a promising method to develop a stable Li metal anode for Li–CO 2 battery.
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JOURNAL OF MEMBRANE SCIENCE
·
2017
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IF 6.035
Leixin Yang,Zhizhang Tian,Xiyuan Zhang,Xingyu Wu,Yingzhen Wu,Yanan Wang,Dongdong Peng,Shaofei Wang,Hong Wu,Zhongyi Jiang
The urgent demand of capturing CO 2 from energy relevant applications stimulated researchers to develop novel high-performance membrane materials. PIM-1, a representative class of polymers of intrinsic microporosity (PIMs), possesses high permeability but low selectivity due to its highly twisted ladder-like structure. A facile approach to improve CO 2 separation performance of PIM-1 is to implant CO 2 -philic fillers. In this study, a novel nano-sized filler Poly(ethylene glycol) functionalized Polyhedral oligomeric (PEG-POSS), with PEG anchored on POSS was incorporated into PIM-1 membrane at nanoscale level to increment CO 2 selectivities of the membrane. The as-prepared PIM-1/PEG-POSS mixed matrix membranes (MMMs) were characterized by Fourier transform infrared (FT-IR) spectra, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Single gas permeabilities of N 2 , CH 4 and CO 2 were measured by the time-lag method. PIM-1/PEG-POSS membranes showed enhanced CO 2 selectivity over CH 4 and N 2 at high PEG-POSS loadings. Specifically, the PIM-1/PEG-POSS membrane with 10 wt% PEG-POSS nanoparticles exhibited the optimal separation performance, of which the CO 2 permeability reached 1300 Barrer and CO 2 /CH 4 selectivity increased by 150% compared with the pristine PIM-1, which surpassed the 2008 Robeson upper bound. The as-prepared PIM-1/PEG-POSS MMMs show great potential for CO 2 capture.
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