Micro-supercapacitors (MSCs) are gradually emerging as a strong contender for the next wearable and portable micro-energy storage devices. Low energy density and poor stability are significant challenges to their widespread application. Based on this, a novel asymmetric all-solid-state Micro-pseudocapacitors (AMPCs) is designed elaborately, in which all the active materials are based on conducting two-dimensional (2D) materials with thin lamellar thickness and active covalent groups on the surface. The positive electrode was made of covalently graft-modified GO with p-phenylenediamine (PrGO), while the negative electrode was made of MXene material. Besides, electrochemically exfoliated graphene (EG) was incorporated into the positive electrode to further improve the electrochemical performance of the PrGO@EG hybrid film electrode due to its excellent conductivity and favorable π-π stacking effects. As a result, the PrGO@EG-30 % electrode demonstrates a high specific capacity of 571 F cm (411 F/g) and maintains excellent stability, retaining 100 % of its capacity even after 10,000 cycles. Surprisingly, the assembled-designed PrGO@EG//MXene AMPCs achieved remarkable electrochemical performance in solid-state electrolytes with a notable capacity of 185.4 F cm (84.6 F/g), impressive stability with 100 % retention after 10,000 cycles, and outstanding volumetric energy density up to 50.5 μWh cm, exceeding the majorities of other state-of-the-art MSCs. Moreover, the microdevices can be easily integrated and electrochemically stable under various bending conditions, demonstrating their significant potential as flexible micro-energy storage devices.
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http://dx.doi.org/10.1016/j.jcis.2024.10.144 | DOI Listing |
Copper is an essential element involved in various biochemical processes, such as mitochondrial energy production and antioxidant defense, but improper regulation can lead to cellular toxicity and disease. Copper Transporter 1 (CTR1) plays a key role in copper uptake and maintaining cellular copper homeostasis. Although CTR1 endocytosis was previously thought to reduce copper uptake when levels are high, it was unclear how rapid regulation is achieved.
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December 2024
LiB Materials Research Group, Research Institute of Industrial Technology and Science (RIST), POSCO Global R and D Center, Sondohwahak-ro 100, Yeonsu-gu, Incheon, 21985, Republic of Korea.
The demand for all-solid-state batteries (ASSBs) featuring credible LiPSCl argyrodite (LPSCl) electrolytes is increasing, driving interest in exploring suitable current collectors for ASSBs. Copper (Cu), used as a current collector in traditional lithium-ion batteries, exhibits significant instability in LPSCl-ASSBs. In this study, the effectiveness of iron (Fe) is systematically investigated as an alternative current collector in LPSCl-ASSBs and compare its performance to that of Cu.
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December 2024
Department of Physics, Indian Institute of Technology Gandhinagar, Gujarat, 382355, India.
Hydrovoltaic power generation from liquid water and ambient moisture has attracted considerable research efforts. However, there is still limited consensus on the optimal material properties required to maximize the power output. Here, we used laminates of two different phases of layered MoS - metallic 1T' and semiconducting 2H - as representative systems to investigate the critical influence of specific characteristics, such as hydrophilicity, interlayer channels, and structure, on the hydrovoltaic performance.
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December 2024
State Key Laboratory of Bio-fibers and Eco-textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, P. R. China.
Organic small molecules (OSMs) with well-defined structures are crucial integral components of cathode catalysts for fuel cells. Despite the acknowledged potential of heteroatom doping to enhance the catalytic performance of metal-free carbon-based catalysts, there exists a notable gap in conducting molecular structure and catalytic activity, particularly under the premise of maintaining a constant molecular skeleton and with a clear molecular structure. Herein, the charge distribution is modulated by introducing different chalcogens into the same molecular skeleton through main-group engineering.
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December 2024
State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, Liaoning, 116024, China.
Significant efforts have been dedicated to the development of highly efficient electrocatalysts for electrochemical CO reduction reactions (eCORR). The outer coordination spheres of catalytic centers may play a pivotal role in the reaction pathway and kinetics for eCORR. Herein, three single copper sites coordinated Aza-fused conjugated organic frameworks (Aza-COFs-Cu) with different outer coordination spheres around Cu sites are designed.
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