Heteroatom-doped carbon materials (HDCMs) have been widely studied as some of the most prominent material candidates for use in a wide range applications, such batteries, supercapacitors (SCs), and oxygen reduction reaction (ORR).

A new class of oxygen reduction reaction (ORR) catalysts based on graphene quantum dots (GQDs) supported by nanoribbons (GNRs) has been developed through a one-step simultaneous reaction, leading to ultrahigh performance for O with an excellent electrocatalytic activity (higher limiting current density and lower overpotential than those platinum) high selectivity stability in alkaline media comparable the best C-based ORR reported so far. Electron microscopy revealed numerous surface/edge...

Abstract Supercapacitors with fast charge/discharge rate and long cycling stability (>50 000 cycles) are attractive for energy storage mobile power supply. In this paper, a facile strategy is developed to fabricate an Fe 2 O 3 /FeS‐decorated N, S‐codoped hierarchical porous carbon hybrid. Its microstructure compositions can be readily controlled through adjusting the hydrothermal reaction between waxberry iron sulfate. The constructed supercapacitors as‐prepared materials from able...

Abstract Hard carbon (HC) is the most promising anode material for sodium‐ion batteries (SIBs), nevertheless, understanding of sodium storage mechanism in HC very limited. As an important aspect mechanism, steady state stored has not been revealed clearly to date. Herein, formation quasi‐metallic and quasi‐ionic bond between within electrochemical reaction on basis theoretical calculations are disclosed. The presence further confirmed with assistance a specific sodiated electrode ethanol, by...

The design of carbon-based materials with a high mass density and large porosity has always been challenging goal, since they fulfill the demands next-generation supercapacitors other electrochemical devices. We report new class high-density heteroatom-doped porous carbon that can be used as an aqueous-based supercapacitor material. material was synthesized by in situ dehalogenation reaction between halogenated conjugated diene nitrogen-containing nucleophiles. Under given conditions,...

Abstract Over the past decades, ground‐breaking techniques and transformative progress have been achieved on exploring alternative battery candidates beyond lithium‐ion batteries, among which sodium‐/potassium‐ion batteries (SIBs/PIBs) are receiving rapidly increased attention. Great efforts devoted to developing verified anode materials. Carbon materials take leading position because of their abundance, low‐cost, environmental friendless, commercial potential. While it is easy understand...

The proposal of dispersion region can complete the HC model, explain anomalous diffusion in low-voltage region, guide microstructure design high-performance materials, and provide new insights into storage mechanism SIBs.

In rechargeable batteries, stable electrode–electrolyte interface (EEI) formation is crucial for achieving high Coulombic efficiency, rate capability, and cycling lifetime. Numerous studies have been conducted on engineering electrolyte components regulating the EEI. However, influence of electrode material EEI has seldom considered. this Perspective, we highlight critical materials formation, namely interfacial catalytic mechanism reduction or oxidation by electrodes. We focus evolution...

Abstract Developing effective strategies to improve the initial Coulombic efficiency (ICE) and cycling stability of hard carbon (HC) anodes for sodium‐ion batteries is key promoting commercial application HC. In this paper, homotype heterojunctions are designed on HC induce generation stable solid electrolyte interfaces, which can effectively increase ICE from 64.7% 81.1%. The results show that using a simple surface engineering strategy construct homotypic amorphous Al 2 O 3 layer could...

Abstract It is commonly accepted that the increased degree of graphitization leads to a higher electrical conductivity carbon materials. However, more and evidence reveals heteroatom doping on host can also improve conductivity, owing dopant atoms contributing charge delocalization density donor states near Fermi level. The reality is, such improvement from often overwhelmed by graphitized carbon. Although heteroatom‐doped widely used as active materials in fields energy storage...

Abstract Immobilizing ultrafine high‐entropy Pt alloy nanocrystals (HENs) in porous carbon (PC) with strong interface interaction, which is crucial to efficient and durable oxygen reduction reaction (ORR), remains a challenge. In this study, an anchoring‐carbonization strategy for strongly bonding sub‐3 nm HENs ordered mesoporous reported. When heating the orderly assembled composites containing hydrophobic organometallic precursors, structure directing agent F127, hydrophilic resol, F127...

The commercialization of fuel cells necessitates achieving ultralow Pt loadings due to the scarcity Pt. Single atoms (SAs) have emerged as a potential solution enhance atomic utilization catalysts. Our density functional theory (DFT) calculations reveal that combining SAs with nanoclusters rather than using alone in catalysts leads optimized electronic structures. coexistence and significantly improves adsorption desorption behaviors oxygen-containing intermediates during oxygen reduction...

Hard carbons (HCs), while a leading candidate for sodium-ion battery (SIB) anode materials, face challenges in their unfavorable sodiation kinetics since the intricate microstructure of HCs complicates Na+ diffusion channel. Herein, Hovenia dulcis-derived HC realizes markedly enhanced high-rate performance virtue dual-functionalized Ca. The interlayer doped Ca2+ effectively enlarges spacing, situ-formed CaSe templates induce formation hierarchical pore structures and intrinsic defects,...

Abstract The safety of the P2‐type layered transition metal oxides (P2‐Na x TMO 2 ), a promising cathode material for sodium‐ion batteries (SIBs), is prerequisite grid‐scale energy storage systems. However, previous thermal runaway studies mainly focused on morphological changes resulting from gas production detection and thermogravimetric analysis, while structural chemical reactions underlying these processes are still unclear. Herein, comprehensive methodology to unveil an interplay...

Li-rich layered Li1+xMnyM1-x-yO2 (or denoted xLi2MnO3·(1 -x)LiMO2, M = Ni, Co, Mn, etc.) are promising cathode materials for high energy-density Li-ion batteries. However, their commercial applications suffer from problems such as a drop in the capacity and discharge voltage during cycling. In this work, cycling performance of oxide Li1.2Ni0.13Co0.13Mn0.54O2 is improved by integration with spinel LiNi0.5Mn1.5O4 to obtain layered-spinel composite. Characterization powder X-ray diffraction...

Hard carbon (HC) displays great potential for high-performance sodium-ion batteries (SIBs) due to its cost-effective, simple fabrication and most likely be commercialized. However, the complicated microstructures of HC lead difficulties in deeply understanding structure-performance correlation. Particularly, evaluation influence pore structure on Na storage performances is still causing disputes rational strategies designing architecture are necessary. In this work, skillful controllable...

Sodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale applications. However, the development is still limited by lack suitable organic cathode with high electronic conductivity that can be operated stably in liquid electrolyte. Herein, we present 5,15-bis(ethynyl)-10,20-diphenylporphyrin (DEPP) [5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II) (CuDEPP) as new cathodes extremely stable sodium-organic...

Nitrogen doping carbon materials are considered to be promising candidates for Na+ storage anodes. However, hitherto, the effects and mechanism of specific single N configuration (among pyrrolic N, quaternary pyridinic N), on sodium behaviors materials, still puzzling, owing difficulties in accurately synthesizing a certain type dominated (NCDCMs). Here, various NCDCMs have been successfully controlled synthesized by small molecule polymerization methods, their synthesis process has also...

Heterostructured Fe₃O₄/FeS₂ catalysts with adjustable sulfuration degrees and variable contents of heterogeneous interfaces have been prepared <italic>via</italic> a facile <italic>in situ</italic> route, which lead to efficient oxygen evolution reaction.