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Sang-Mun Jung Seung-Yeon Kang Byung-Jo Lee Jinhyeon Lee Jaesub Kwon Dongwook Lee Yong-Tae Kim 《Advanced functional materials》2023,33(45):2304067
Harvesting low-grade waste heat, which constitutes 60% of the overall waste heat, is key to halting climate change. Electrochemical waste-heat harvesting has recently drawn attention to practical low-grade waste-heat harvesting. In this study, a power density maximization strategy is presented in scalable and cost-effective aqueous redox couple-based thermo-electrochemical cells (TECs). The n-type feature of the water-soluble Fe2+/3+ redox couple is essential for constructing the TEC p–n leg device; however, it has not been investigated much so far. The modulation of the chaotropicity of counteranions enhances the absolute value of the Seebeck coefficient for the Fe2+/3+ redox couple with an inner-sphere reaction mechanism because of the greater structural disorder in the solvation shell. Moreover, the use of a cost-effective Fe─N─C electrocatalyst shows redox kinetics and a power density comparable to those of state-of-the-art Pt electrodes, economically compensating for the sluggish charge-transfer kinetics of the inner-sphere redox mechanism. The Fe─N─C -based TEC device exhibits 1.73 W m−2 of power density at 0.1 $ W−1 of cost per power, which is 1.24% with respect to the Carnot efficiency, exceeding 0.23–0.53% compared to those reported for previous Pt-based TEC devices with the same redox chemistry. 相似文献
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Enhanced Hydrogen Production by Photoreforming of Renewable Oxygenates Through Nanostructured Fe2O3 Polymorphs
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Giorgio Carraro Chiara Maccato Alberto Gasparotto Tiziano Montini Stuart Turner Oleg I. Lebedev Valentina Gombac Gianpiero Adami Gustaaf Van Tendeloo Davide Barreca Paolo Fornasiero 《Advanced functional materials》2014,24(3):372-378
Sunlight‐driven hydrogen production via photoreforming of aqueous solutions containing renewable compounds is an attractive option for sustainable energy generation with reduced carbon footprint. Nevertheless, the absence of photocatalysts combining high efficiency and stability upon solar light activation has up to date strongly hindered the development of this technology. Herein, two scarcely investigated iron(III) oxide polymorphs, β‐ and ε‐Fe2O3, possessing a remarkable activity in sunlight‐activated H2 generation from aqueous solutions of renewable oxygenates (i.e., ethanol, glycerol, glucose) are reported. For β‐Fe2O3 and ε‐Fe2O3, H2 production rates up to 225 and 125 mmol h?1 m?2 are obtained, with significantly superior performances with respect to the commonly investigated α‐Fe2O3. 相似文献
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Electrocatalysis: Mo Doping Induced More Active Sites in Urchin‐Like W18O49 Nanostructure with Remarkably Enhanced Performance for Hydrogen Evolution Reaction (Adv. Funct. Mater. 32/2016)
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Xing Zhong Youyi Sun Xianlang Chen Guilin Zhuang Xiaonian Li Jian‐Guo Wang 《Advanced functional materials》2016,26(32):5769-5769
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Feng Zhang Xiaoqin Zou Xue Gao Songjie Fan Fuxing Sun Hao Ren Guangshan Zhu 《Advanced functional materials》2012,22(17):3583-3590
Hydrogen‐based energy is a promising renewable and clean resource. Thus, hydrogen selective microporous membranes with high performance and high stability are demanded. Novel NH2‐MIL‐53(Al) membranes are evaluated for hydrogen separation for this goal. Continuous NH2‐MIL‐53(Al) membranes have been prepared successfully on macroporous glass frit discs assisted with colloidal seeds. The gas sorption ability of NH2‐MIL‐53(Al) materials is studied by gas adsorption measurement. The isosteric heats of adsorption in a sequence of CO2 > N2 > CH4 ≈ H2 indicates different interactions between NH2‐MIL‐53(Al) framework and these gases. As‐prepared membranes are measured by single and binary gas permeation at different temperatures. The results of singe gas permeation show a decreasing permeance in an order of H2 > CH4 > N2 > CO2, suggesting that the diffusion and adsorption properties make significant contributions in the gas permeation through the membrane. In binary gas permeation, the NH2‐MIL‐53(Al) membrane shows high selectivity for H2 with separation factors of 20.7, 23.9 and 30.9 at room temperature (288 K) for H2 over CH4, N2 and CO2, respectively. In comparison to single gas permeation, a slightly higher separation factor is obtained due to the competitive adsorption effect between the gases in the porous MOF membrane. Additionally, the NH2‐MIL‐53(Al) membrane exhibits very high permeance for H2 in the mixtures separation (above 1.5 × 10?6 mol m?2 s?1 Pa?1) due to its large cavity, resulting in a very high separation power. The details of the temperature effect on the permeances of H2 over other gases are investigated from 288 to 353 K. The supported NH2‐MIL‐53(Al) membranes with high hydrogen separation power possess high stability, resistance to cracking, temperature cycling and show high reproducibility, necessary for the potential application to hydrogen recycling. 相似文献
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Chenyao Wu Shige Wang Jiulong Zhao Yiyun Liu Yuting Zheng Yu Luo Changqing Ye Mingxian Huang Hangrong Chen 《Advanced functional materials》2019,29(26)
In this study, biocompatible Fe(III) species‐WS2‐polyvinylpyrrolidone (Fe(III) @ WS2‐PVP) nanocapsules with enhanced biodegradability and doxorubicin (DOX) loading capacity are one‐pot synthesized. In this nanocapsule, there exists a redox reaction between Fe(III) species and WS2 to form Fe2+ and WO42?. The formed Fe2+ could be oxidized to Fe3+, which reacts with Fe(III) @ WS2‐PVP again to continuously produce Fe2+ and WO42?. Such a repeated endogenous redox reaction leads to an enhanced biodegradation and DOX release of DOX @ Fe(III) @ WS2‐PVP. More strikingly, the Fe2+ generation and DOX release are further accelerated by the overexpressed H2O2 and the mild acidic tumor microenvironment (TME), since H2O2 and H+ can accelerate the oxidation of Fe2+. The continuously generated Fe2+ catalyzes a fast Fenton reaction with the innate H2O2 in tumor cells and produces abundant highly toxic hydroxyl radicals for nanocatalytic tumor therapy. Together with the high photothermal transforming capability, the DOX @ Fe(III) @WS2‐PVP nanocapsules successfully achieve the endogenous redox reaction and exogenous TME‐augmented tumor photothermal therapy, chemo and nanocatalytic therapy outcome. The concept of material design can be innovatively extended to the synthesis of biodegradable Fe(III) @ MoS2‐PVP nanocomposite, thus paving a promising novel way for the rational design of intelligent theranostic agents for highly efficient treatment of cancer. 相似文献
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Junying He Yanbo Liu Yucheng Huang Hao Li Yuqin Zou Chung-Li Dong Shuangyin Wang 《Advanced functional materials》2021,31(15):2009245
The efficiency of water splitting is largely hindered by the sluggish kinetics of the oxygen evolution reaction. Cobalt-based (oxy)hydroxides are promising electrocatalysts, but their performance is still under the expected goal due to the restricted active sites and intrinsic activity. Herein, Co80Fe20(OH)(OCH3) (CoFeMe) is synthesized with intercalation and rich vacancies by a cation exsolution process in a one-step solve-thermal reaction. With the help of the Fe incorporation, the specific surface area of CoFeMe increases to 101.6 m2 g−1, which is six times that of Co(OH)(OCH3) (CoMe) (16.5 m2 g−1). Also, the induced rich vacancies are traced in the X-ray absorption spectra of CoFeMe. Because of the synergistic effect between the intercalation, Fe incorporation and vacancies, the overpotential of CoFeMe is only 240 mV to drive the current density to 10 mA cm−2, which is reduced 110 mV compared with that of pristine CoMe (350 mV). 相似文献
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Fangyu Xiong Jiantao Li Chunli Zuo Xiaolin Zhang Shuangshuang Tan Yalong Jiang Qinyou An Paul K. Chu Liqiang Mai 《Advanced functional materials》2023,33(6):2211257
Na4Fe3(PO4)2(P2O7) (NFPP) is considered as a promising cathode material for sodium-ion batteries (SIBs) due to its low cost, non-toxicity, and high structural stability, but its electrochemical performance is limited by the poor electronic conductivity. In this study, Mg-doped NFPP/C composites are presented as cathode materials for SIBs. Benefiting from the enhanced electrochemical kinetics and intercalation pseudocapacitance resulted from the Mg doping, the optimal Mg-doped NFPP/C composite (NFPP-Mg5%) delivers high rate performance (capacity of ≈40 mAh g−1 at 20 A g−1) and ultra-long cycling life (14 000 cycles at 5 A g−1 with capacity retention of 80.8%). Moreover, the in situ X-ray diffraction and other characterizations reveal that the sodium storage process of NFPP-Mg5% is dominated by the intercalation pseudocapacitive mechanism. In addition, the full SIB based on NFPP-Mg5% cathode and hard carbon anode exhibits the discharge capacity of ≈50 mAh g−1 after 200 cycles at 500 mA g−1. This study demonstrates the feasibility of improving the electrochemical performance of NFPP by doping strategy and presents a low-cost, ultra-stable, and high-rate cathode material for SIBs. 相似文献
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Elena Taboada Raul Solanas Elisenda Rodríguez Ralph Weissleder Anna Roig 《Advanced functional materials》2009,19(14):2319-2324
Monodisperse iron oxide/microporous silica core/shell composite nanoparticles, core(γ‐Fe2O3)/shell(SiO2), with a diameter of approximately 100 nm and a high magnetization are synthesized by combining sol–gel chemistry and supercritical fluid technology. This one‐step processing method, which is easily scalable, allows quick fabrication of materials with controlled properties and in high yield. The particles have a specific magnetic moment (per kg of iron) comparable to that of the bulk maghemite and show superparamagnetic behavior at room temperature. The nanocomposites are proven to be useful as T2 MRI imaging agent. They also have potential to be used in NMR proximity sensing, theranostic drug delivery, and bioseparation. 相似文献
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