Synergetic Electrolyte Chemistry Enables Flame-Retardancy, K-Desolvation, Anti-Corrosion and Wide-Temperature-Tolerance in Potassium-Ion Batteries.

Potassium-ion batteries (PIBs) have emerged as an appealing, sustainable and cost-effective candidate for grid-scale energy storage due to abundant K resources and reversible K de/intercalation in graphite anodes (KC, 279 mAh g). However, their practical operation suffers from sluggish kinetics and severe capacity deterioration in traditional carbonate electrolytes. Herein, ethoxy (pentafluoro) cyclotriphosphazene (PFPN) and methyl (2,2,2-trifluoroethyl) carbonate (FEMC) are introduced as cosolvents to rejuvenate conventionally low-concentration (1 M) 1,2-dimethoxyethane (DME)-based electrolytes.

Advancements and Perspectives on Nonaqueous Electrolyte Engineering for Graphite Anode in Potassium-Ion Battery.

Potassium-ion batteries (KIBs) have emerged as a promising alternative to lithium-ion batteries due to the abundance and low cost of potassium resources. Coupled with commercial graphite anode, KIBs have great potential for the next-generation large-scale electrochemical energy storage devices. However, graphite anode in KIBs suffers from rapid capacity decay in commercial "potassium hexafluorophosphate (KPF) + ethylene carbonate (EC)" electrolytes.

Evaluating the World Health Organization's health promotion strategies: Sentiments, health beliefs, and the COVID-19 pandemic.

Based on the Health Belief Model (HBM), this study examined what messages about COVID-19 were presented on the World Health Organization (WHO)'s Facebook posts, and evaluated WHO's health promotion strategies by examining the public engagement and sentiment stimulated by different health promotion constructs. One issue with previous studies on HBM and social networking sites is that many researchers considered positive "online engagements" as evidence of "effective health promotion". However, online engagement measures such as shares and comments cannot reflect the sentiment's valence.

Integrating commercial graphite with network-like carbon fibers for high-rate and long-term cycling K-storage.

K can reversibly intercalate into graphite by forming KC (279 mA h g, ≈0.2 V) in conventional carbonate electrolytes, but the large ionic radius of K (1.38 Å) easily results in structural degradation and rapid capacity decay.

A Dual-Carbon Potassium-Ion Capacitor Enabled by Hollow Carbon Fibrous Electrodes with Reduced Graphitization.

The large size of K ions (1.38 Å) sets a challenge in achieving high kinetics and long lifespan of potassium storage devices. Here, a fibrous ZrO membrane is utilized as a reactive template to construct a dual-carbon K-ion capacitor.

Ultrastable Graphite-Potassium Anode through Binder Chemistry.

Graphite with abundant reserves has attracted enormous research interest as an anode of potassium-ion batteries (PIBs) owing to its high plateau capacity of 279 mAh g at ≈0.2 V in conventional carbonate electrolytes. Unfortunately, it suffers from fast capacity decay during K storage.

Health belief model and social media engagement: A cross-national study of health promotion strategies against COVID-19 in 2020.

Background: Using the Health Belief Model (HBM), this study analyzed tweets related to COVID-19 published by national health departments of the United States, the South Korea, the United Kingdom, Japan, Germany, and India to explore their differences in (1) the health measures against COVID-19, (2) the health promotion strategies, (3) the social media engagements that those measures and strategies have triggered.

Method: We conducted a content analysis with 1,200 randomly selected COVID-19-related tweets from six national health departments' Twitter accounts from 1 January 2020 to 31 December 2020. We coded the six HBM constructs and 21 sub-themes of the HBM constructs for each tweet.

Cross-Linked Sodium Alginate as A Multifunctional Binder to Achieve High-Rate and Long-Cycle Stability for Sodium-Ion Batteries.

Sodium-ion batteries (SIBs) hold great promise owing to the naturally abundant sodium resource and high safety. The research focus of SIBs is usually directed toward electrode materials, while the binder as an important component is rarely investigated. Herein, a cross-linked sodium alginate (SA)/graphene oxide (GO) binder is judiciously designed to serve as a robust artificial interphase on the surface of both anode and cathode of SIBs.

A Mechanically Flexible Necklace-Like Architecture for Achieving Fast Charging and High Capacity in Advanced Lithium-Ion Capacitors.

Integration of fast charging, high capacity, and mechanical flexibility into one electrode is highly desired for portable energy-storage devices. However, a high charging rate is always accompanied by capacity decay and cycling instability. Here, a necklace-structured composite membrane consisting of micron-sized FeSe cubes uniformly threaded by carbon nanofibers (CNF) is reported.

A comparative study of public health and social measures of COVID-19 advocated in different countries.

Coronavirus 2019 (COVID-19) has had a significant impact on the world. Different countries introduced various public health and social measures (PHSMs) against the coronavirus. This paper aims to (a) examine how national policies on PHSMs were framed and which PHSMs were adopted; (b) compare the similarities and differences of PHSMs advocated by different countries; and (c) examine whether these measures have changed with time.

Evolution of media frames about e-cigarettes from 2004 to 2019: a content analysis of newspapers in China.

This study conducted a content analysis of 639 news articles about e-cigarettes in China from 2004-2019 to examine longitudinal changes in media frames and media tones about e-cigarettes in Chinese newspapers. Results indicated that policy frame was the most frequently used frame, followed by human impact frame, information frame, and uncertainty frame. Dividing the time period of 2004-2019 into four phases (i.

Al O -Assisted Confinement Synthesis of Oxide/Carbon Hollow Composite Nanofibers and Application in Metal-Ion Capacitors.

Hollow micro-/nanostructures are widely explored for energy applications due to their unique structural advantages. The synthesis of hollow structures generally involves a "top-down" casting process based on hard or soft templates. Herein, a new and generic confinement strategy is developed to fabricate composite hollow fibers.

Large-Area, Uniform, Aligned Arrays of Na (VO) (PO ) F on Carbon Nanofiber for Quasi-Solid-State Sodium-Ion Hybrid Capacitors.

Sodium-vanadium fluorophosphate (Na V O (PO ) F , NVPF, 0 ≤ x ≤ 1) is considered to be a promising Na-storage cathode material due to its high operation potentials (3.6-4 V) and minor volume variation (1.8%) during Na -intercalation.

Mesopore-Induced Ultrafast Na -Storage in T-Nb O /Carbon Nanofiber Films toward Flexible High-Power Na-Ion Capacitors.

Hybrid Na-ion capacitors (NICs) are receiving considerable interest because they combine the merits of both batteries and supercapacitors and because of the low-cost of sodium resources. However, further large-scale deployment of NICs is impeded by the sluggish diffusion of Na in the anode. To achieve rapid redox kinetics, herein the controlled fabrication of mesoporous orthorhombic-Nb O (T-Nb O )/carbon nanofiber (CNF) networks is demonstrated via in situ SiO -etching.