Electrocatalysis
·
2023
·Vol. 14
·期 5
·776-787
·
IF 3.1
Zheng Yingping,Yu Dehua,Zhang Ke,Xu Wei,Ma Kaili,Wang Yuhang,Lou Yongbing
As a representative anodic reaction, the oxygen evolution reaction (OER) is often combined with hydrogen evolution, carbon dioxide reduction, and other cathodic reactions. Bimetallic selenides can satisfy the requirement of efficiency and economy for OER. However, the OER performance of Fe-Co-Se is less than satisfactory, restricted by the limited inherent active sites. Therefore, by doping P into Fe-Co-Se, the electron density and mass transfer were successfully adjusted. The 3D dandelion-like flower Fe-Co-Se-P/CC showed η 10 of 210 mV and the 45.3 mV dec −1 Tafel slope better than Fe-Co-Se/CC and RuO 2 . Experimental investigations demonstrated that outstanding OER activity was ascribed to the double modulation influences of P dopant both in electron environment and morphology which could not only improve conductivity but also enrich catalytic reactive sites. This work presents another choice for the design of a transition metal OER catalyzer and propels the development of electrocatalytic oxygen production to higher efficiency and lower cost. Graphical Abstract 3D dandelion-like flowers Fe - Co-Se-P structure anchored on carbon cloth has been firstly synthesized as economy and efficient OER electrocatalyst, which displays outstanding catalytic perform ance (equipped with 210 mV low overpotential at η 10 ) and stability benefited from the double modulation effect of P doping on the electronic environment and morphology.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 647
·期 9
·1025-1030
·
IF 1.24
Yihan Wang,Hu Zhou,Jinghao Xiao,Aihua Yuan
Metal selenides as anode materials of lithium-ion batteries (LIBs) has received considerable attention recently. In order to boost the electronic conductivity and alleviate the volume change of electrode materials upon the cycles, a facile strategy is employed in this work, where Prussian blue analogue (PBA) nanocubes are encapsulated into three-dimensional (3D) network of graphene aerogel (GA), followed by a high-temperature selenization treatment to isolate the composite of FeCoSe 2 @GA. The composite can be directly employed as free-standing anode materials of LIBs. Studies reveal that the FeCoSe 2 @GA electrode demonstrates an intriguing cycle stability and rate capability with a specific capacity of ∼500 mAh g −1 at 100 mA g −1 after 100 cycles. The outstanding lithium-storage properties can be attributed to the 3D porous feature as well as the strong confinement effect of GA for FeCoSe 2 particles, which provides a large number of ion-exchange channels, and prevents the severe agglomeration and large volume expansion of active particles during the charge/discharge process.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 20
·2000740
·
IF 4.948
Xuekun Hong,Yuyang Xu,Ruyue Wang,Peng Du,Zebi Zhao,Kai Huang,Haolin Tang,Yushen Liu,Ming Lei,Hui Wu
High-performance and low-cost oxygen electrode catalysts for rechargeable metal–air battery have been regarded as one pivotal issue for the ever-increasing energy-demanding devices like electric vehicles, domestic appliances, and consumer electronics. To develop an effective substitute of noble-metal-based catalysts, the modified nitrogen-doped mesoporous carbon (NMC) is proposed as composite catalysts with a series of 2D transition metal selenides (MSe, M = Fe and/or Co) by liquid exfoliation, anchoring, and thermal activation. By varying the transition metal elements, CoSe@NMC is confirmed as the competitive alternative relative to the coupled commercial catalysts (IrO 2 and Pt/C), with a comparable overpotential for oxygen evolution reaction at 10 mA cm −2 and positively shifted half-wave potential for oxygen reduction reaction even after accelerated durability tests for 5000 cycles. Therefore, this postmodification strategy can promote further design toward the advanced electrode materials for other energy conversion and storage techniques.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiaxu Dai,Longyue Zhang,Zheng Zhang,Hao Chen,Yaoping Hu,Guochang Li,Lei Han
Developing oxygen evolution reaction (OER) catalysts that can efficiently and stably operate at high current densities in seawater electrolysis is urgently demanded but challenging. In this study, selenium-vacancies-rich iron-cobalt selenide nanosheets (FeCoSe-V Se ) decorated with fluorine-doped carbon dots (FCDs) are rationally designed and prepared on nickel foams (NF) through the successive processes of hydrothermal treatment and selenization. Benefiting from the large accessible surface area and abundant active sites provided by FCDs and selenium vacancy defects, as well as the coupled interface between FCDs and FeCoSe-V Se that optimizes the oxygen adsorption energy and accelerates the kinetic process, the FCDs/FeCoSe-V Se /NF composite exhibits excellent OER catalytic activities with a low overpotential of 258 mV at a current density of 200 mA cm −2 in 1 M KOH and a small Tafel slope of 34.7 mV dec –1 . In the electrolytes of simulated and natural seawater, the overpotentials of the FCDs/FeCoSe-V Se /NF electrode are slightly higher, measured to be 264 and 297 mV, respectively. More profoundly, the introduction of FCDs enhances the corrosion resistance of the catalyst in alkaline electrolytes, ensuring the long-term stability. This work offers a guidance to improve the electrochemical performances of catalysts for high-efficiency seawater oxidation.
研究领域:
电化学
·
材料科学
·
催化
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7248-7256
·
IF 12.732
Peijia Wang,Jiajie Huang,Jing Zhang,Liang Wang,Peiheng Sun,Yefeng Yang,Zhujun Yao
Transition metal selenides have emerged as a class of promising anodes for sodium ion batteries (SIBs). However, the notorious issues of their low electrical conductivity and huge volume changes during sodium ion insertion/extraction lead to poor cycling stability and inferior rate capability. In this work, hierarchically core–branched iron cobalt selenide arrays coated with N-doped carbon shell (denoted as FeCo–Se@NC) were rationally designed and synthesized on carbon cloth through a combined strategy of hydrothermal, selenization and carbonization processes. Benefitting from the designed arrays with simultaneous Fe doping into the CoSe2 matrix and N-doped carbon coating, the optimized FeCo–Se@NC electrode possesses greatly enhanced structural integrity and accelerated ion/electron transfer kinetics. When employed as a binder- and additive-free anode for SIBs, the FeCo–Se@NC electrode exhibits a high reversible capacity of 532.1 mA h g−1 at 0.05 A g−1, competitive rate capability (193.3 mA h g−1 at 5 A g−1), and good cycling stability (386.1 mA h g−1 after 150 cycles at 0.5 A g−1). Moreover, when coupled with Na3V2(PO4)3/C, the full cell delivers a high capacity of 350.6 mA h g−1 at 0.1 A g−1 and a high energy density of 276.7 W h kg−1. This work is expected to provide a new avenue for the development of arrayed transition metal selenide-based materials for high-performance SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）