The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly...The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly desirable, although it still remains challenging. Herein, we report a facile and reliable route to convert ZIF-8 modified by Fe-phenanthroline into Fe-incorporated and N-doped carbon dodecahedron nanoarchitecture(Fe-NCDNA), in which carbon nanosheets are formed in situ as the building blocks with uniform Fe-N-C species decoration. Systematic electrochemical studies demonstrate that the as-synthesized Fe-NCDNA electrocatalyst possesses highly attractive catalytic features toward the ORR in terms of activity and durability in both alkaline and neutral media. The Zn-air battery with the optimal Fe-NCDNA catalyst as the cathode performs impressively, delivering a power density of 184 m W cm^–2 and a specific capacity of 801 m Ah g^–1;thus, it exhibits great competitive advantages over those of the Zn-air devices employing a Pt-based cathode electrocatalyst.展开更多
Electrochemical energy devices serve as a vital link in the mutual conversion between chemical energy and electrical energy.This role positions them to be essential for achieving high-efficiency utilization and advanc...Electrochemical energy devices serve as a vital link in the mutual conversion between chemical energy and electrical energy.This role positions them to be essential for achieving high-efficiency utilization and advancement of renewable energy.Electrochemical reactions,including anodic and cathodic reactions,play a crucial role in facilitating the connection between two types of charge carriers:electrons circulating within the external circuit and ions transportation within the internal electrolyte,which ensures the completion of the circuit in electrochemical devices.While electrons are uniform,ions come in various types,we herein propose the concept of hybrid electrochemical energy technologies(h-EETs)characterized by the utilization of different ions as charge carriers of anodic and cathodic reactions.Accordingly,this review aims to explore the fundamentals of emerging hybrid electrochemical energy technologies and recent research advancements.We start with the introduction of the concept and foundational aspects of h-EETs,including the proposed definition,the historical background,operational principles,device configurations,and the underlying principles governing these configurations of the h-EETs.We then discuss how the integration of hybrid charge carriers influences the performance of associated h-EETs,to facilitate an insightful understanding on how ions carriers can be beneficial and effectively implemented into electrochemical energy devices.Furthermore,a special emphasis is placed on offering an overview of the research progress in emerging h-EETs over recent years,including hybrid battery capacitors that extend beyond traditional hybrid supercapacitors,as well as exploration into hybrid fuel cells and hybrid electrolytic synthesis.Finally,we highlight the major challenges and provide anticipatory insights into the future perspectives of developing high-performance h-EETs devices.展开更多
Microbial fuel cells(MFCs) are environmentally friendly technology capable of converting chemical energy stored in wastewaters directly into electrical energy by using microorganisms as biocatalysts. However, the over...Microbial fuel cells(MFCs) are environmentally friendly technology capable of converting chemical energy stored in wastewaters directly into electrical energy by using microorganisms as biocatalysts. However, the overall low power density of the MFC and the high cost of its components are two major barriers for its commercialization. Among all the factors, the electrodes(cathode and anode) materials play the significant role in affecting the performance of MFCs. Recently, the performance of MFCs has been improved by using graphene-based electrodes that are more conductive and mechanically stable with larger surface area and higher electrocatalytic activity compared to the conventional carbon materials. This paper provides an overview of recent research progress in graphene-based materials as electrodes for MFCs, which will be the promising candidates for developing MFCs and other bioelectrochemical systems to achieve sustainable water/wastewater treatment and bioenergy production.展开更多
文摘The application of electrocatalysts for the oxygen reduction reaction(ORR) is vital in a variety of energy conversion technologies. Exploring low-cost ORR catalysts with high activity and long-term stability is highly desirable, although it still remains challenging. Herein, we report a facile and reliable route to convert ZIF-8 modified by Fe-phenanthroline into Fe-incorporated and N-doped carbon dodecahedron nanoarchitecture(Fe-NCDNA), in which carbon nanosheets are formed in situ as the building blocks with uniform Fe-N-C species decoration. Systematic electrochemical studies demonstrate that the as-synthesized Fe-NCDNA electrocatalyst possesses highly attractive catalytic features toward the ORR in terms of activity and durability in both alkaline and neutral media. The Zn-air battery with the optimal Fe-NCDNA catalyst as the cathode performs impressively, delivering a power density of 184 m W cm^–2 and a specific capacity of 801 m Ah g^–1;thus, it exhibits great competitive advantages over those of the Zn-air devices employing a Pt-based cathode electrocatalyst.
基金supported by the National Natural Science Foundation of China(22109164,22225902,and U22A20436)the National Key Research&Development Program of China(2022YFE0115900,2021YFA1501500)+2 种基金the CASCommonwealth Scientific and Industrial Research Organization(CSIRO)Joint Research Projects(121835KYSB20200039)the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021011)Fujian Province Central Government Guides to Science and Technology Development Special Project(2022L3024)。
文摘Electrochemical energy devices serve as a vital link in the mutual conversion between chemical energy and electrical energy.This role positions them to be essential for achieving high-efficiency utilization and advancement of renewable energy.Electrochemical reactions,including anodic and cathodic reactions,play a crucial role in facilitating the connection between two types of charge carriers:electrons circulating within the external circuit and ions transportation within the internal electrolyte,which ensures the completion of the circuit in electrochemical devices.While electrons are uniform,ions come in various types,we herein propose the concept of hybrid electrochemical energy technologies(h-EETs)characterized by the utilization of different ions as charge carriers of anodic and cathodic reactions.Accordingly,this review aims to explore the fundamentals of emerging hybrid electrochemical energy technologies and recent research advancements.We start with the introduction of the concept and foundational aspects of h-EETs,including the proposed definition,the historical background,operational principles,device configurations,and the underlying principles governing these configurations of the h-EETs.We then discuss how the integration of hybrid charge carriers influences the performance of associated h-EETs,to facilitate an insightful understanding on how ions carriers can be beneficial and effectively implemented into electrochemical energy devices.Furthermore,a special emphasis is placed on offering an overview of the research progress in emerging h-EETs over recent years,including hybrid battery capacitors that extend beyond traditional hybrid supercapacitors,as well as exploration into hybrid fuel cells and hybrid electrolytic synthesis.Finally,we highlight the major challenges and provide anticipatory insights into the future perspectives of developing high-performance h-EETs devices.
基金supported by the Natural Science Foundation of Jiangxi Province (20152ACB21019)the National Natural Science Foundation of China (21206068)the National Basic Research Program of China (2013CB934004)
文摘Microbial fuel cells(MFCs) are environmentally friendly technology capable of converting chemical energy stored in wastewaters directly into electrical energy by using microorganisms as biocatalysts. However, the overall low power density of the MFC and the high cost of its components are two major barriers for its commercialization. Among all the factors, the electrodes(cathode and anode) materials play the significant role in affecting the performance of MFCs. Recently, the performance of MFCs has been improved by using graphene-based electrodes that are more conductive and mechanically stable with larger surface area and higher electrocatalytic activity compared to the conventional carbon materials. This paper provides an overview of recent research progress in graphene-based materials as electrodes for MFCs, which will be the promising candidates for developing MFCs and other bioelectrochemical systems to achieve sustainable water/wastewater treatment and bioenergy production.
