MOLECULES
·
2024
·Vol. 29
·期 22
·5242
·
IF 4.2
Chunlei Li,Shun Li,Long Zhao,Jianming Zhang
Harnessing waste heat from environmental or industrial sources presents a promising approach to eco-friendly and sustainable chemical synthesis. In this study, we introduce a thermoelectrocatalytic (TECatal) system capable of utilizing even small amounts of heat for hydrogen peroxide (H2O2) production. We developed a nanohybrid structure, combining carbon nanotubes (CNTs) and Bi2Te3nanoflakes (Bi2Te3/CNTs), through a one-pot synthesis method. Bi2Te3, as a thermoelectric (TE) material, generates charge carriers under a temperature gradient via the Seebeck effect, enabling them to participate in surface redox reactions. However, the rapid recombination of these charge carriers greatly limits the TECatal activity. In the Bi2Te3/CNTs nanohybrid system, the introduction of CNTs substantially enhances the efficiency of H2O2production, as the strong bonding between CNTs and Bi2Te3, along with the excellent conductivity of CNTs, facilitates charge carrier separation and transport, as confirmed by TE electrochemical tests. This study underscores the significant potential of thermoelectric nanomaterials for converting waste heat into green chemical synthesis.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dan Gao,Yuanyuan Cao,Zhaohao Li,Niankun Guo,Hongyuan Zhang
The waste heat utilization in the coal-fired plant has always been one of important ways of the energy saving. In this paper, a novel device is constructed by the combination of the ceramic membrane desorption and the flue gas waste heat utilization. In the device, the absorption solution is the “double-cationic” ionic liquid ([TEPA][1-MIm]). Furthermore, experimental results show that the contact angle of the hydrophobic ceramic membrane is 130°. Under ambient temperature conditions, it is observed that at a concentration of 25 % [TEPA][1-MIm] in an ethylene glycol solution, the maximum absorption amount of CO 2 reaches approximately 1.605 mol CO 2 /mol amine. The saturation time of the absorption is about 20 min. As the concentration of ionic liquids increases, the saturation time gradually extends due to an increase in [TEPA][1-MIm] and consequently higher total CO 2 absorption mass. Subsequently, effects of the operating parameters on the desorption rates are analyzed. The contribution of this work is to put forward the idea of utilizing ceramic membranes to recover the waste heat from the flue gas to reduce the CO 2 desorption energy consumption. According to experiments, the overall heat transfer coefficient can reach 20.33 W/(m 2 ·K), and the amount of the recovered waste heat can reach 29.97 W.
研究领域:
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 21
·2000934
·
IF 4.948
Tingting Meng,Yimin Xuan
Waste heat utilization, including solar heat and various industrial waste heats, plays an important role in improving energy efficiency, but current heat-to-electricity conversion technologies can only harvest a little heat energy. A new direct thermally self-chargeable supercapacitor (TCS) system, using the nanoporous carbon electrode in electrolyte mixed with nanoparticles, can simultaneously produce and store electric energy from a low-grade heat source. Moreover, it can simultaneously realize charging and discharging processes. A method of strengthening ions migration by adding nanoparticles into electrolytes is proposed. When heated, due to the Brownian motion of suspended nanoparticles and the interactions among ions and nanoparticles, more ions migrate to the hot electrode, which leads to a high thermal-induced open-circuit voltage (OCV) of 265 mV, under a mild temperature difference of 50 K. This new type of TCS system attains a thermoelectric coefficient of 5.3 mV K −1 and outperforms other conventional TCS systems in which liquid electrolytes are involved.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Kun Zhang,Xiaochuan Wang,Hongxing Li,Xueting Zhao,Guangzu Zhang,Changlong Tan,Yanxu Wang,Bing Li
Minimizing the utilization of fossil fuels and mitigating CO 2 emissions are two of the most significant worldwide concerns in the current century. The pervasive waste heat not only results in great energy wastage but also poses a great environmental concern. Typical phase change materials (PCMs) suffer from uncontrolled thermal energy utilization as a result of spontaneous heat loss. We provide a new approach to thermal energy storage that challenges the traditional notion of minimizing hysteresis in solid-state refrigeration using PCMs. Instead, we introduce a second stimulus, such as uniaxial stress, magnetic field, electric field, or hydrostatic pressure, to take advantage of the hysteresis phenomenon. This enables us to prevent spontaneous heat loss by implementing a hysteresis energy barrier when the PCMs come into contact with cooler surroundings. Additionally, we may actively regulate the release of thermal energy using a secondary stimulus. The technological viability of these thermal batteries is proven through the utilization of TiNiNb, MnNiCoGeSi, BaTiO 3 , and neopentylglycol, respectively. Notably, by machine-learning-guided design, Ni 50 Ti 40 Zr 8.75 Nb 1.25 alloy was prepared and shown to be an outstanding choice for thermal batteries due to its appropriate and exceptionally broad working temperature range (71 K). Our study offers a new strategy for developing thermal energy storage materials and it is anticipated to greatly enhance the utilization of waste heat.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Bo Wu,Yang Guo,Chengyi Hou,Qinghong Zhang,Yaogang Li,Hongzhi Wang
Flexible thermoelectric generators (TEGs) provide a sustainable solution for directly harvesting low-grade heat from various curved surfaces, presenting a promising potential for feeding energy to personal-electronics or internet-of-things systems. Nevertheless, the room-temperature millivolt output of the cutting-edge all-solid-state flexible material-based TEGs (AF-TEGs) is still unappeasable for flexible electronics in practical applications. Here, we report on an AF-TEG consisting of a 3-level structure based on thin-film carbon nanotube (CNT) assemblies that can generate a high voltage (1.05 V) and sufficient outpower (0.95 mW) at moderate ΔT (~44 and 39 K, respectively) for powering an electrochromic device . The advanced nature of the AF-TEG is that conformation is highly adaptive and programmable, showing the surface suitability which can capture waste heat in both in-plane and out-of-plane direction. Moreover, an AF-TEG power management scheme is proposed for powering a commercial LED and an electronic thermometer, which indicate promising potential for practical applications.
研究领域:
材料科学
·
能源技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jiang Wu,Ni Qin,Baowei Yuan,Enzhu Lin,Dinghua Bao
A novel catalytic effect of pyroelectric materials induced by a change in temperature, namely pyroelectric catalysis, was found to be attractive due to its ability to utilize waste heat in pollution treatment. In this work, the pyroelectric catalytic properties of BaTiO3 (BTO) nanowires synthesized by a template hydrothermal method have been thoroughly investigated. The nanowires with an elongated polar axis show a superior pyroelectric catalytic performance in comparison with the equiaxial nanoparticles. Our numerical simulation results with a finite element method indicate that the enhanced catalytic efficiency of BTO nanowires can be attributed to the higher pyroelectric potential. On the basis of the pyroelectric effect and our experimental results, a pyroelectric catalytic degradation mechanism has been proposed by taking into account the migration of charge carriers and the formation of reaction radicals. This study for enhancing the pyroelectric catalytic activity by using BTO nanowires may provide a facile, promising, and new reusable strategy for the catalytic degradation of organic dye pollutant by means of temperature variation. It is hoped that the present work gives a clear understanding of the mechanism of pyroelectric catalysis.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Refrigeration
·
2025
·
IF 3.8
Yufan Yang,Chunhuan Luo,Chunting Zhou,Muran He,Lin Lang,Xi Yu,Changchang Yang,Yufan Chen
The typical operating temperature of a low-temperature proton exchange membrane fuel cell (LT-PEMFC) is approximately 80°C, with a thermoelectric ratio of approximately 1. To utilize the waste heat of LT-PEMFCs, an absorption chiller (AC) using R1336mzz(Z)/TEGDME as the working pair coupled with LT-PEMFCs vehicles was proposed in this work. The saturated vapor pressure and viscosity of this novel working pair were measured and regressed. The excess enthalpy and specific enthalpy were determined by NRTL model. Based on the thermophysical properties, the performance of the coupled system was investigated under various operating conditions. Results showed that this AC system was able to utilize the waste heat generated by LT-PEMFCs for cooling in the range of 269.1 K to 293.2 K, which can meet the cooling demands of most commercial vehicles. The efficiency of the coupled system was approximately 0.67, which represents a 55.8% improvement over the standalone LT-PEMFCs system. In typical summer conditions, the coupled system extended the endurance mileage of LT-PEMFCs vehicles by 14% and saved 12% of hydrogen in a daily route. Thus, the AC using R1336mzz(Z)/TEGDME coupled LT-PEMFCs vehicles has a great significance for enhancing the performance and enlarging the mileage.
研究领域:
能源工程
·
燃料电池技术
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2528-2539
·
IF 4.682
Ye Zhenda,Zhao Xi,Yu Weitai,Chen Ying,Lin Pengcheng
Thermal conductive composite materials (TCCMs) applied in the thermal management are of ever-rising significance with the rapid development of a variety of thermal-related industrial products. Previously, the demand for TCCMs with differential thermal conductivity is generally met by using two strategies, tuning the material composition and designing the composite microstructure. However, the miscibility between different components is usually poor, resulting in the uniformity of thermal conductivity of TCCMs. In this work, the flexible reduced graphene oxide@calcium alginate (RGO@CA) composite fibers are fabricated by wet spinning of the lyotropic graphene oxide composite liquid crystals and wet chemical reduction. The resulted RGO@CA composite fibers exhibit high tensile strength of about 200 MPa. The graded utilization of the waste heat can be realized by using RGO@CA composite fibers with different compositions. The displayed utilizations of the waste heat include thermal energy storage, optical sensor, thermal source for chemical reaction. The proposed liquid crystal spinning demonstrates a novel strategy for developing advanced materials toward the thermal management and waste heat recovery of electronic devices and systems. Graphical abstract
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Yufan Yang,Chunhuan Luo,Chunting Zhou,Muran He
To enhance the performance of low-temperature proton exchange membrane fuel cells (LT-PEMFC) and meet cooling demands, this study proposes an absorption-compression cycle using R1336mzz(Z)/TEGDME as the working pair, coupled with LT-PEMFC. The thermal properties of this working pair, including saturation vapor pressure and specific heat capacity, were measured and regressed, while the mixing enthalpy and specific enthalpy were calculated using the NRTL model. Based on the obtained thermal properties, MATLAB simulations were performed to evaluate the performance of the coupled system under varying operating conditions representative of both winter and summer environments. The results indicate that this coupled system can effectively utilize the low-temperature waste heat generated by LT-PEMFC to provide cooling at −20 °C. When LT-PEMFC produces 60 kW of usable electric power, the cooling capacity can reach 32.5 kW in winter and 60.1 kW in summer. Under typical winter and summer operating conditions, the coefficient of performance of the coupled system is approximately 0.73, representing a 9 % improvement over the compression cycle and a 65.5 % increase compared to the standalone LT-PEMFC, which is significant for enhancing vehicle performance.
研究领域:
能源工程
·
热力学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 13
·期 6
·4142-4149
·
IF 10.7
Xiaoling Sun,Yitong Li,Dewen Zeng,Zhiwei Zeng,Chen Gong,Changyi Wu,Hongyi Chen
The energy efficiency of batteries is generally compromised by internal resistance and polarization, which lead to considerable energy losses in widespread applications. Herein, we save the electrical energy and enhance energy efficiency by simultaneously charging Zn-ion batteries using waste heat and electricity. Using first-principles calculations and the modified Nernst equation, a high entropy Layered Double Hydroxide (LDH) reaction was introduced into the anode of a NiHCF/Zn battery, leading to a record absolute temperature coefficient of 3.157 mV K−1 and a massive heat absorption during the charging process. Then the modified battery was charged at 45 °C and normally discharged at 5 °C, significantly saving 11.23% of electrical energy during charging and elevating the energy efficiency to 105.16%. Additionally, the NiHCF/Zn-LDH battery exhibits extraordinary stability, enduring over 1000 charge/discharge cycles with a capacity fade of less than 4.27%. This work demonstrates that large energy saving and surpassing 100% energy efficiency through heat charging are feasible, presenting a potential technology for enhancing energy conservation in battery applications.
研究领域:
电化学
·
能源材料
·
物理化学
·
储能技术
·
热电转换
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2025
·
IF 30.8
Sunmiao Fang,Yuxuan Huang,Saichao Dang,Khalid Hazazi,Yue Cao,Jiachen Wang,Pingfan Wu,Stefaan De Wolf,Hussam Qasem,Qiaoqiang Gan
Moisture-driven hydrovoltaic devices (MHDs) are an emerging class of energy harvesters that convert ambient moisture gradients into electricity, offering notable potential for decentralized power supply in off-grid regions. However, their output performance is often limited by sluggish moisture sorption and evaporation kinetics. Herein, we developed a high-performance cellulose-based MHD that is capable of delivering a stable voltage of ~0.7 V and a power density of 20 mW m -2 for over 30 days under ambient conditions (40%-70% RH, ~20 ℃). To overcome the intrinsic power limitations, we constructed a hybrid energy harvesting system by coupling the MHD with a photovoltaic (PV) panel using an interfacial hydrogel cooling layer. This synergistic design enables the MHD to harness waste heat generated by the PV panel, boosting its power output by ~150%. At the same time, evaporative cooling lowers the PV panel temperature by up to 13.5 °C, increasing its power output by ~15%. The integrated system can directly power various electronic devices and support energy storage, paving the way for sustainable, self-powered Internet of Things networks and net-zero energy buildings through efficient utilization of ambient moisture and solar-induced thermal waste.
研究领域:
可再生能源
·
材料科学
·
能量收集
·
可持续技术
·
环境工程
✓ 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）