Dapeng Liu

Coupling Sub‐Nanometric Copper Clusters with Quasi‐Amorphous Cobalt Sulfide Yields Efficient and Robust Electrocatalysts for Water Splitting Reaction

Superefficient water-splitting materials comprising sub-nanometric copper clusters and quasi-amorphous cobalt sulfide supported on copper foam are reported. While working together at both the anode and cathode sides of an alkaline electrolyzer, this material gives a catalytic output of overall water splitting comparable with the Pt/C-IrO2 -coupled electrolyzer.

A Flexible and Wearable Lithium-Oxygen Battery with Record Energy Density achieved by the Interlaced Architecture inspired by Bamboo Slips.

A flexible and wearable lithium-oxygen (air) battery inspired by Chinese bamboo slips is constructed. In this novel battery, cathodes and anodes are woven without an air diffusion layer and any outer packaging; besides, the woven structure allows oxygen to access the cathodes from both sides freely, endowing the battery with a record energy density of over 523 W h kg-1 .

Flexible Electrodes for Sodium-Ion Batteries: Recent Progress and Perspectives

Sodium-ion batteries (SIBs) are considered as promising alternatives to lithium-ion batteries (LIBs) for large-scale electrical-energy-storage applications due to the wide availability and the low cost of Na resources. Along with the avenues of research on flexible LIBs, flexible SIBs are now being actively developed as one of the most promising power sources for the emerging field of flexible and wearable electronic devices. Here, the recent progress on flexible electrodes based on metal substrates, carbonaceous substrates (i.e., graphene, carbon cloth, and carbon nanofibers), and other materials, as well as their applications in flexible SIBs, are summarized. Also, some future research directions for constructing flexible SIBs are proposed, with the aim of providing inspiration to the further development of advanced flexible SIBs.

High-Performance Integrated Self-Package Flexible Li–O2 Battery Based on Stable Composite Anode and Flexible Gas Diffusion Layer

With the rising development of flexible and wearable electronics, corresponding flexible energy storage devices with high energy density are required to provide a sustainable energy supply. Theoretically, rechargeable flexible Li-O2 batteries can provide high specific energy density; however, there are only a few reports on the construction of flexible Li-O2 batteries. Conventional flexible Li-O2 batteries possess a loose battery structure, which prevents flexibility and stability. The low mechanical strength of the gas diffusion layer and anode also lead to a flexible Li-O2 battery with poor mechanical properties. All these attributes limit their practical applications. Herein, the authors develop an integrated flexible Li-O2 battery based on a high-fatigue-resistance anode and a novel flexible stretchable gas diffusion layer. Owing to the synergistic effect of the stable electrocatalytic activity and hierarchical 3D interconnected network structure of the free-standing cathode, the obtained flexible Li-O2 batteries exhibit superior electrochemical performance, including a high specific capacity, an excellent rate capability, and exceptional cycle stability. Furthermore, benefitting from the above advantages, the as-fabricated flexible batteries can realize excellent mechanical and electrochemical stability. Even after a thousand cycles of the bending process, the flexible Li-O2 battery can still possess a stable open-circuit voltage, a high specific capacity, and a durable cycle performance.

In situ redox strategy for large-scale fabrication of surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres

A facile in situ redox strategy has been developed to fabricate surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres. In this process, noble metal salts were directly reduced by the pre-prepared Fe3O4 components in an alkaline aqueous solution without using organic reductants and surfactants. During the redox reaction, Fe3O4 was oxidized into Fe2O3, and the reduzates of noble metal nanoparticles were deposited on the surface of the Fe2O3 nanospheres. Then the characterizations were discussed in detail to study the formation of M-Fe2O3 hybrids. At last, catalytic CO oxidation was selected as a model reaction to evaluate the catalytic performance of these samples. It demonstrates that Pt-Fe2O3 nanospheres can catalyze 100 % conversion of CO into CO2 at 90°C, indicating superior activity relative to Pd-Fe2O3 and Au-Fe2O3.摘要本工作利用原位氧化还原策略, 成功制备出无表面活性剂修饰的M-Fe2O3(M=Pt, Pd, Au)杂化纳米球. 在反应过程中, 以事先制备好的Fe3O4纳米球作为载体和还原剂, 在碱性条件下直接还原高价态的贵金属盐前躯体. 反应后, Fe3O4被氧化成Fe2O3, 而贵金属纳米粒子作为还原产物则牢牢的沉积在氧化产物Fe2O3表面形成M-Fe2O3杂化纳米球. 通过表征系统研究了所得产物的形貌、结构和催化性质. 并以CO催化氧化为模型反应对产物进行评估, 结果表明, 样品Pt-Fe2O3在90°C即可将CO 100%催化转化为CO2, 相比Pd-Fe2O3和Au-Fe2O3具有更高的催化活性.

Self-Assembled Pd@CeO2/γ-Al2O3 Catalysts with Enhanced Activity for Catalytic Methane Combustion

Pd@CeO2 /Al2 O3 catalysts are of great importance for real applications, such as three-way catalysis, CO oxidation, and methane combustion. In this article, the Pd@CeO2 core@shell nanospheres are prepared via the autoredox reaction in aqueous phase. Three kinds of methods are then employed, that is, electrostatic interaction, supramolecular self-assembly, and physical mixing, to support the as-prepared Pd@CeO2 nanospheres on γ-Al2 O3 . A model reaction of catalytic methane-combustion is employed here to evaluate the three Pd@CeO2 /γ-Al2 O3 samples. As a result, the sample Pd@CeO2 -S-850 prepared via supramolecular self-assembly and calcined at 850 °C exhibits superior catalytic performance to the others, which has a far lower light-off temperature (T50 of about 364 °C). Moreover, almost no deterioration of Pd@CeO2 -S-850 is observed after five sequent catalytic cycles. The analysis of H2 -TPR curves concludes that there exists hydrogen spillover related to the strong metal-support interaction between Pd species and oxides. The strong metal-support interaction and the specific surface areas might be responsible for the catalytic performance of the Pd@CeO2 samples toward catalytic methane combustion.