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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Journal ArticleDOI
MOF-derived electrocatalysts for oxygen reduction, oxygen evolution and hydrogen evolution reactions
TL;DR: A wide range of applications based on these materials for ORR, OER, HER and multifunctional electrocatalysis are discussed, with an emphasis on the required features of MOF-derived carbon-based materials for the Electrocatalysis of corresponding reactions.
Journal ArticleDOI
Advanced Architectures and Relatives of Air Electrodes in Zn-Air Batteries.
TL;DR: A perspective for design, preparation, and assembly of air electrodes is proposed for the future innovations of Zn–air batteries with high performance.
Journal ArticleDOI
Nanostructured Co-based bifunctional electrocatalysts for energy conversion and storage: current status and perspectives
TL;DR: In this article, the fundamental mechanisms of the bifunctional electrocatalysis of ORR/OER and OER/HER are introduced and analyzed, and recent progress in the design, synthesis and emerging applications of nonnoble cobalt (Co)-based materials (e.g., cobalt oxide, cobalt phosphides and cobalt chalcogenides), including layered double hydroxides, Co N-C, Co-N-C and Co-based single atoms and their composites, are summarized and discussed.
Journal ArticleDOI
Recent Development of Zeolitic Imidazolate Frameworks (ZIFs) Derived Porous Carbon Based Materials as Electrocatalysts
Journal ArticleDOI
Decorating Co/CoNx nanoparticles in nitrogen-doped carbon nanoarrays for flexible and rechargeable zinc-air batteries
Cao Guan,Afriyanti Sumboja,Wenjie Zang,Yuhong Qian,Hong Zhang,Ximeng Liu,Zhaolin Liu,Dan Zhao,Stephen J. Pennycook,John Wang +9 more
TL;DR: In this paper, the authors synthesize unique hybrid cobalt/cobalt nitride (Co/CoNx) nanoparticles well-integrated with nitrogen-doped carbon (NC) nanoarrays through a facile fabrication using a two-dimensional metal-organic framework (MOF) precursor.
References
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Journal ArticleDOI
MOF-Derived Hierarchically Porous Carbon with Exceptional Porosity and Hydrogen Storage Capacity
TL;DR: In this paper, the authors presented porous carbon with hierarchical pore structure derived from highly crystalline metal organic frameworks (MOF-derived carbon: MDC) without any carbon source and showed it as a promising hydrogen storage adsorbent.
Journal ArticleDOI
Self-Templating Synthesis of Hollow Co3O4 Microtube Arrays for Highly Efficient Water Electrolysis
TL;DR: An electrochemical sacrificial-template strategy to fabricate hollow Co3 O4 microtube arrays with hierarchical porosity is developed, which can rival that of state-of-the-art noble-metal and transition-metal electrocatalysts.
Journal ArticleDOI
Cross-laboratory experimental study of non-noble-metal electrocatalysts for the oxygen reduction reaction
Frédéric Jaouen,Juan Herranz,Michel Lefèvre,Jean-Pol Dodelet,Ulrike I. Kramm,Iris Herrmann,Peter Bogdanoff,Jun Maruyama,Toru Nagaoka,Arnd Garsuch,Jeff Dahn,Tim S. Olson,Svitlana Pylypenko,Plamen Atanassov,Eugene A. Ustinov +14 more
TL;DR: Nine non-noble-metal catalysts from five different laboratories were investigated for the catalysis of O(2) electroreduction in an acidic medium, and the nitrogen and metal seem to be present in sufficient amounts in the NNMCs and do not limit activity.
Journal ArticleDOI
Well-Dispersed ZIF-Derived Co,N-Co-doped Carbon Nanoframes through Mesoporous-Silica-Protected Calcination as Efficient Oxygen Reduction Electrocatalysts
Lu Shang,Huijun Yu,Xing Huang,Tong Bian,Run Shi,Yufei Zhao,Geoffrey I. N. Waterhouse,Li-Zhu Wu,Chen-Ho Tung,Tierui Zhang +9 more
TL;DR: A well-dispersed Co,N co-doped carbon nanoframework with hierarchically porous structure with comparable oxygen reduction reaction (ORR) catalytic activity to that of commercial Pt catalysts with the same loading is synthesized via a mesoporous-silica-protected calcination strategy.
Journal ArticleDOI
Topological Defects in Metal-Free Nanocarbon for Oxygen Electrocatalysis.
Cheng Tang,Cheng Tang,Hao-Fan Wang,Xiang Chen,Bo-Quan Li,Ting-Zheng Hou,Bingsen Zhang,Qiang Zhang,Qiang Zhang,Maria-Magdalena Titirici,Fei Wei +10 more
TL;DR: A bifunctional graphene catalyst with abundant topological defects is achieved via the carbonization of natural gelatinized sticky rice to probe the underlying oxygen electrocatalytic mechanism and reveals the lowest overpotential for both oxygen reduction and evolution catalysis.