Journal ArticleDOI
MO-Co@N-Doped Carbon (M = Zn or Co): Vital Roles of Inactive Zn and Highly Efficient Activity toward Oxygen Reduction/Evolution Reactions for Rechargeable Zn–Air Battery
Biaohua Chen,Xiaobo He,Fengxiang Yin,Hao Wang,Hao Wang,Di-Jia Liu,Ruixing Shi,Jinnan Chen,Hongwei Yin +8 more
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In this paper, the MO-Co@N-doped carbon (NC, M = Zn or Co) is developed as a highly active ORR/OER bifunctional catalyst via pyrolysis of a bimetal metal-organic framework containing Zn and Co, i.e., precursor (CoZn).Abstract:
A highly efficient bifunctional oxygen catalyst is required for practical applications of fuel cells and metal–air batteries, as oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are their core electrode reactions. Here, the MO-Co@N-doped carbon (NC, M = Zn or Co) is developed as a highly active ORR/OER bifunctional catalyst via pyrolysis of a bimetal metal–organic framework containing Zn and Co, i.e., precursor (CoZn). The vital roles of inactive Zn in developing highly active bifunctional oxygen catalysts are unraveled. When the precursors include Zn, the surface contents of pyridinic N for ORR and the surface contents of Co–Nx and Co3+/Co2+ ratios for OER are enhanced, while the high specific surface areas, high porosity, and high electrochemical active surface areas are also achieved. Furthermore, the synergistic effects between Zn-based and Co-based species can promote the well growth of multiwalled carbon nanotubes (MWCNTs) at high pyrolysis temperatures (≥700 °C), which is favorable for charge transfer. The optimized CoZn-NC-700 shows the highly bifunctional ORR/OER activity and the excellent durability during the ORR/OER processes, even better than 20 wt% Pt/C (for ORR) and IrO2 (for OER). CoZn-NC-700 also exhibits the prominent Zn–air battery performance and even outperforms the mixture of 20 wt% Pt/C and IrO2.read more
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Hollow waxberry-like cobalt–nickel oxide/S,N-codoped carbon nanospheres as a trifunctional electrocatalyst for OER, ORR, and HER
Qing Zhang,Han Wenjie,Zhixiao Xu,Li Yinling,Lu Chen,Zhengyu Bai,Lin Yang,Xiaolei Wang,Xiaolei Wang +8 more
TL;DR: In this article, the authors reported the synthesis of waxberry-like cobalt-nickel oxide/S,N-codoped carbon hollow nanocomposites as trifunctional catalysts.
Journal ArticleDOI
Boosting the Oxygen Reduction Performance via Tuning Synergy between Metal Core and Oxide Shell of Metal‐Organic Frameworks‐Derived Co@CoOx
Hao Wang,Ronghui Kou,Qiu Jin,Yuzi Liu,Fengxiang Yin,Cheng-Jun Sun,Liang Wang,Zhi-Yuan Ma,Yang Ren,Ning Liu,Biaohua Chen +10 more
Journal ArticleDOI
An Efficient Family of Misfit-Layered Calcium Cobalt Oxide Catalyst for Oxygen Evolution Reaction
Xiao Lin,Hongliang Bao,Dehua Zheng,Jing Zhou,Xiao Guoping,Chengzhi Guan,Linjuan Zhang,Jianqiang Wang +7 more
Journal ArticleDOI
Structural engineering of S-doped Co/N/C mesoporous nanorods via the Ostwald ripening-assisted template method for oxygen reduction reaction and Li-ion batteries
TL;DR: In this paper, a facile Ostwald ripening-assisted template method was used to controllably synthesize one-dimensional S-doped Co/N/C mesoporous nanorods as electrode materials for electrocatalytic oxygen reduction and Li-ions batteries.
Journal ArticleDOI
CoFe nanoparticles dispersed in Co/Fe-N-C support with meso- and macroporous structures as the high-performance catalyst boosting the oxygen reduction reaction for Al/Mg-air batteries
Naiguang Wang,Jianwen Liang,Jingjing Liu,Qiong Cai,Jingsha Li,Jinpeng Chen,Tao Huang,Zhicong Shi +7 more
TL;DR: In this article, a CoFe nanoparticles with surface oxides dispersed in Co/Fe-N-C support via carbonizing melamine and ethylenediaminetetraacetic acid chelated with metal ions was prepared.
References
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Journal ArticleDOI
Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction.
TL;DR: It is reported that vertically aligned nitrogen-containing carbon nanotubes (VA-NCNTs) can act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability, and tolerance to crossover effect than platinum for oxygen reduction in alkaline fuel cells.
Journal ArticleDOI
Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction
TL;DR: In this paper, the authors report a protocol for evaluating the activity, stability, and Faradaic efficiency of electrodeposited oxygen-evolving electrocatalysts for water oxidation.
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Design of electrocatalysts for oxygen- and hydrogen-involving energy conversion reactions
TL;DR: The emphasis of this review is on the origin of the electrocatalytic activity of nanostructured catalysts toward a series of key clean energy conversion reactions by correlating the apparent electrode performance with their intrinsic electrochemical properties.
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A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.
TL;DR: The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.
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Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts
TL;DR: In this paper, the oxygen reduction reaction (ORR) active site was characterized by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species.