|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Large specific surface area S-doped Fe-N-C electrocatalysts derived from Metal-Organic frameworks for oxygen reduction reaction显示文摘It is highly desired but challenging to develop platinum group metal-free electrocatalysts for oxygen reduction reaction(ORR),which can promote the commercialization of fuel cell technology.To achieve this target,we report a one-step doping method to prepare S-doped Fe-N-C catalysts using zeolite imidazole framework(ZIF-8)and iron(Ⅲ)thiocyanate(Fe(SCN)_(3))as precursor.Different from conventional doping approach,i.e.physical mixing,Fe(SCN)_(3) is in-situ added during ZIF-8 formation which would encapsulate Fe(SCN)_(3) molecules inside ZIF-8 to avoid structure destruction and create potential replacement of Zn ions by Fe ions to form uniform Fe-N_(4) complexes.As a result,the prepared S-doped Fe-N-C catalysts own large specific surface areas with a maximum value of 1326 m^(2) g^(-1) and a dual-scale porous structure that benefits mass transport.Significantly,the composition-optimized catalyst exhibits superior ORR activity in both 0.1 M HClO_(4) electrolyte and 0.1 M KOH electrolyte,in which the half-wave potential reaches 0.81 V and 0.92 V(vs.RHE),respectively.Remarkable stability is also attained,which loses 2 m V only after 10000 potential cycles in O_(2)-saturated 0.1 M HClO_(4) and remains almost constant in O_(2)-saturated 0.1 M KOH,surpassing commercial Pt/C catalyst in both acidic and alkaline medium. | Xiaohui Yan Xiaolin Li Cehuang Fu Chen Lin Huanming Hu Shuiyun Shen Guanghua Wei Junliang Zhang | 2020 | Progress in Natural Science:Materials International2020，30，6： | 3 |
| 2 | Hydrogen-assisted scalable preparation of ultrathin Pt shells onto surfactant-free and uniform Pd nanoparticles for highly efficient oxygen reduction reaction in practical fuel cells显示文摘Concentrating active Pt atoms in the outer layers of electrocatalysts is a very effective approach to greatly reduce the Pt loading without compromising the electrocatalytic performance and the total electrochemically active surface area(ECSA)for the oxygen reduction reaction(ORR)in hydrogen-based proton-exchange membrane fuel cells.Accordingly,a facile,low-cost,and hydrogen-assisted two-step method is developed in this work,to massively prepare carbon-supported uniform,small-sized,and surfactant-free Pd nanoparticles(NPs)with ultrathin~3-atomic-layer Pt shells(Pd@Pt_(3L) NPs/C).Comprehensive physicochemical characterizations,electrochemical analyses,fuel cell tests,and density functional theory calculations reveal that,benefiting from the ultrathin Pt-shell nanostructure as well as the resulting ligand and geometric effects,Pd@Pt_(3L) NPs/C exhibits not only significantly enhanced ECSA,electrocatalytic activity,and noble-metal(NM)utilization compared to commercial Pt/C,showing 81.24 m^(2)/gPt,0.710 mA/cm^(2),and 352/577 mA/mgNM/Pt in ECSA,area-,and NM-/Pt-mass-specific activity,respectively;but also a much better electrochemical stability during the 10,000-cycle accelerated degradation test.More importantly,the corresponding 25-cm^(2) H2-air/O_(2) fuel cell with the low cathodic Pt loading of~0.152 mgPt/cm^(2)geo achieves the high power density of 0.962/1.261 W/cm^(2)geo at the current density of only 1,600 mA/cm^(2)geo,which is much higher than that for the commercial Pt/C.This work not only develops a high-performance and practical Pt-based ORR electrocatalyst,but also provides a scalable preparation method for fabricating the ultrathin Pt-shell nanostructure,which can be further expanded to other metal shells for other energy-conversion applications. | Liuxuan Luo Cehuang Fu Aiming Wu Zechao Zhuang Fengjuan Zhu Fangling Jiang Shuiyun Shen Xiyang Cai Qi Kang Zhifeng Zheng Chenyi Hu Jiewei Yin Guofeng Xia Junliang Zhang | 2022 | Nano Research2022，15，3： | 2 |
| 3 | Facile controlled synthesis of hierarchically structured mesoporous Li_(4)Ti_(5)O_(12)/C/rGO composites as high-performance anode of lithium-ion batteries显示文摘t In this paper,a facile strategy is proposed to controllably synthesize mesoporous Li_(4)Ti_(5)O_(12)/C nanocomposite embedded in graphene matrix as lithium-ion battery anode via the co-assembly of Li_(4)Ti_(5)O_(12)(LTO)precursor,GO,and phenolic resin.The obtained composites,which consists of a LTO core,a phenolic-resin-based carbon shell,and a porous frame constructed by rGO,can be denoted as LTO/C/rGO and presents a hierarchical structure.Owing to the advantages of the hierarchical structure,including a high surface area and a high electric conductivity,the mesoporous LTO/C/rGO composite exhibits a greatly improved rate capability as the anode material in contrast to the conventional LTO electrode. | Cehuang FU Shuiyun SHEN Ruofei WU Xiaohui YAN Guofeng XIA Junliang ZHANG | 2022 | Frontiers in Energy2022，16，4： | 0 |
| 4 | Influence of Fe on electrocatalytic activity of iron-nitrogendoped carbon materials toward oxygen reduction reaction显示文摘The development of highly active nitrogendoped carbon-based transition metal(M-N-C)compounds for the oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs)greatly helps reduce fuel cell cost,thus rapidly promoting their commercial applications.Among different M-N-C electrocatalysts,the series of Fe-N-C materials are highly favored because of their high ORR activity.However,there remains a debate on the effect of Fe,and rare investigations focus on the influence of Fe addition in the second heat treatment usually performed after acid leaching in the catalyst synthesis.It is thus very critical to explore the influences of Fe on the ORR electrocatalytic activity,which will,in turn,guide the design of Fe-N-C materials with enhanced performance.Herein,a series of Fe-N-C electrocatalysts are synthesize and the influence of Fe on the ORR activity are speculated both experimentally and theoretically.It is deduced that the active site lies in the structure of Fe-N4,accompanied with the addition of appropriate Fe,and the number of active sites increases without the occurrence of agglomeration particles.Moreover,it is speculated that Fe plays an important role in stabilizing N as well as constituting active sites in the second pyrolyzing process. | Lin LI Cehuang FU Shuiyun SHEN Fangling JIANG Guanghua WEI Junliang ZHANG | 2022 | Frontiers in Energy2022，16，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员