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Recycled cathode materials enabled superior performance for lithium-ion batteries

Based on our closed-loop recycling process, recycled NMC111 with unique microstructure has a superior rate and cycle performance, verified by various industry-level tests. Recycled materials’ unique void/pore-rich structure provides a higher Li chemical diffusion coefficient and better strain mitigation during cycling, leading to fewer cracks. Thus,...

Lead-lean and MA-free perovskite solar cells with an efficiency over 20%

Lead-lean tin-lead perovskite solar cells were fabricated using lead powder as lead source through galvanic displacement reaction (GDR). The reducibility of lead powder effectively suppressed the oxidation of Sn2+; therefore, PCEs of 18.34% (8.5 mol % Pb2+) and 20.01% (18.7 mol % Pb2+) were achieved with low lead contents.

Intrinsic voltage plateau of a Nb2CTx MXene cathode in an aqueous electrolyte induced by high-voltage scanning

In the past decade, two-dimensional MXenes have been a rising star in the energy storage field, featured by fast surficial redox and high-rate energy storage. However, typically, MXene electrodes exhibit capacitive behavior with a rapidly descending output voltage during discharge. Moreover, the absence of distinct voltage plateaus deteriorates their...

Wind power production from very large offshore wind farms

Many countries are planning development of very large offshore wind farms to aid decarbonization of the energy sector. High-resolution numerical simulations are performed to quantify power production (capacity factors [CFs]) and the spatial scale and effects of downstream wakes (areas of disturbed flow) from lease areas that are under development along...

Toward a more productive discourse on rooftop solar and energy justice

Rooftop solar has been inequitably adopted with respect to income. However, adoption inequity is not a unique or permanent characteristic of rooftop solar. Inequitable adoption is a common and typically temporary feature of emerging technologies in structurally unequal societies. Like other technologies, rooftop solar has become more equitably deployed...

Nanoscale heterogeneous distribution of surface energy at interlayers in organic bulk-heterojunction solar cells

Here, the nanoscale distribution of surface energy (γs) is characterized by the PFQNM method. We demonstrate a strategy to tune the nanoscale HeD-SE at interlayers through incorporating MoS2 nanosheets, which modulate the morphology of BHJ, leading to optimization of charge recombination and extraction in the devices. Further, the relationship among...

Low-cost manganese dioxide semi-solid electrode for flow batteries

Flow batteries are advantageous for long-duration energy storage. This paper identifies the technical and economic feasibility of MnO2 semi-solid electrode for flow batteries through electrochemical and rheological experiments, and cost modeling. Despite the low chemical cost, MnO2 semi-solid electrode can incur high costs for power components such...

Electroosmotic flow steers neutral products and enables concentrated ethanol electroproduction from CO2

Electrochemical reduction of CO2 enables carbon-negative production of ethanol, an important commodity fuel. Previous electrolyzers suffer from product crossover and severe dilution of produced ethanol. Here, we present an electrolyzer that eliminates the product loss mechanisms and produces ethanol at a concentration over 13 wt %, comparable with incumbent...

Large magnon-induced anomalous Nernst conductivity in single-crystal MnBi

Transverse thermoelectrics utilizing the anomalous Nernst effect (ANE) can be a novel approach to energy sustainability. We investigate the thermoelectric transport properties in ferromagnetic MnBi and observe one of the largest ANEs ever reported. We attribute this giant ANE to the coexistence of ferromagnetism and the heavy Bi atom. Our discovery...

Ultra-power-dense heat exchanger development through genetic algorithm design and additive manufacturing

We design, fabricate, and characterize an ultra-power-dense heat exchanger using a genetic algorithm design and metal additive manufacturing. The genetic algorithm is coupled to a two-dimensional finite element method simulation to optimize internal architectures, an approach that has relatively low computational intensity. Computed tomography X-ray...

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