Ruiming Jia

Bio: Ruiming Jia is an academic researcher from Qingdao University of Science and Technology. The author has contributed to research in topics: Heterojunction & Quantum dot. The author has an hindex of 1, co-authored 4 publications receiving 14 citations.

Active sites provided by the surface autocatalytic effect and quantum confinement for stable and efficient photocatalytic hydrogen generation

Abstract: Photocatalytic hydrogen evolution from water is a promising approach for renewable energy generation and storage. However, traditional photocatalysts suffer from limited hydrogen evolution rates due to the lack of active sites. In this work, we demonstrate that a plenty of active sites can be provided by the surface autocatalytic effect and quantum confinement of ultrasmall SiC nanocrystals (NCs). A metal-free photocatalyst is constructed by anchoring the ultrasmall SiC NCs on carbon nitride (CN) nanosheets for efficient and durable hydrogen generation. Moreover, the optical absorption in the visible range and the separation of electrons and holes are significantly improved by the heterojunction band alignment. As a consequence, the CN/SiC NC composite exhibits a high hydrogen evolution rate up to 1889 μmol g−1 h−1 under visible light irradiation with an apparent quantum yield (AQY) of 9.8% at 420 nm. And the photocatalyst shows high stability in the cyclic test. This work provides a new strategy to develop highly efficient photocatalysts for hydrogen generation via the surface autocatalytic effect and quantum confinement.

Fabrication of symmetric supercapacitors based on MOF-derived nanoporous carbons

Abstract: Nanoporous carbon (NPC) materials with high specific surface area have attracted considerable attention for electrochemical energy storage applications. In the present work, we have designed novel symmetric supercapacitors based on NPC by direct carbonization of Zn-based metal-organic frameworks (MOFs) without using an additional precursor. By controlling the reaction conditions in the present study, we synthesized NPC with two different particle sizes. The effects of particle size and mass loadings on supercapacitor performance have been carefully evaluated. Our NPC materials exhibit excellent electrochemical performance with a maximum specific capacitance of 251 F g-1 in 1 M H2SO4 electrolyte. The symmetric supercapacitor studies show that these efficient electrodes have good capacitance, high stability, and good rate capability.

Doping strategy, properties and application of heteroatom-doped ordered mesoporous carbon

Abstract: To date, tremendous achievements have been made to produce ordered mesoporous carbon (OMC) with well-designed and controllable porous structure for catalysis, energy storage and conversion However, OMC as electrode material suffers from poor hydrophilicity and weak electrical conductivity Numerous attempts and much research interest have been devoted to dope different heteroatoms in OMC as the structure defects to enhance its performance, such as nitrogen, phosphorus, sulphur, boron, and multi heteroatoms Unfortunately, the “how–why–what” question for the heteroatom-doped OMC has not been summarized in any published reports Therefore, this review focuses on the functionalization strategies of heteroatoms in OMC and the corresponding process characteristics, including in situ method, post treatment method, and chemical vapor deposition The fundamentally influencing mechanisms of various heteroatoms in electrochemical property and porous structure are summarized in detail Furthermore, this review provides an updated summary about the applications of different heteroatom-doped OMC in supercapacitor, electrocatalysis, and ion battery during the last decade Finally, the future challenges and research strategies for heteroatom-doped OMC are also proposed

Recent design and control of carbon materials for supercapacitors

Abstract: Supercapacitor is a promising energy storage device, so a lot of researches have focused on the design and control of carbon materials. In recent years, carbon materials have achieved rapid developments in the field of supercapacitors. A variety of synthetic strategies are emerging, which greatly enriches the synthesis technology and makes it possible to fabricate carbon materials with complex structures. This review focuses on the recent design and control of carbon materials for supercapacitors. Here, the different dimensions of carbon materials are discussed and analyzed to understand their advantages and disadvantages in morphologies. And various synthesis methods were developed to overcome these shortcomings of carbon materials to achieve a breakthrough in performances. These synthetic methods are systematically classified, and each one is illustrated with representative examples. To obtain high-performance electrode materials in supercapacitors, the relationships between the synthesis methods, the structures of carbon material and the electrochemical performances were discussed in depth to accurately control morphologies of carbon materials. Current emerging challenges are summarized, and some directions are proposed to solve it to improve the performances of supercapacitors in the future.

Recent progress on biomass waste derived activated carbon electrode materials for supercapacitors applications—A review

Abstract: The investigation of renewable, cost-effective, and environmentally gracious electrode materials with high adsorption, fast ion/electron transport, and tunable surface chemistry is immediately desirable for the development of next-generation biocompatible energy-storage devices. In recent years, biomass-derived carbon electrode materials for energy storage have attracted significant attention because of their widespread availability, renewable nature, and low cost. More importantly, their inherent uniform and precise biological structures can be utilized as templates for fabricating electrode materials with controlled and well-defined geometries. The current review mainly spotlights on recent research progress towards biomass derived carbon electrode materials include plant, fruit, vegitable, animal waste, and microorganism based carbon electrode materials for supercapacitor applications. And over view of different synthesis methods for conversion and activation of biomass waste are discussed. Furthermore, summary and future research trends in this filed are projected.