Highly Active and Stable Graphene Tubes Decorated with FeCoNi Alloy Nanoparticles via a Template‐Free Graphitization for Bifunctional Oxygen Reduction and Evolution

Gupta, Shiva; Qiao, Liang; Zhao, Shuai; Xu, Hui; Lin, Ye; Devaguptapu, Surya V.; Wang, Xianliang; Swihart, Mark T.; Wu, Gang

doi:10.1002/aenm.201601198

Cited by 236 publications

(139 citation statements)

References 58 publications

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“…First, SNCF-NR provides higher ECSA. Besides, the ECSA was also estimated from the gravimetric double layer capacitance as reported by Wu et al [44,45] At a scan rate of 20 mV s −1 , the calculated value of ECSA for SNCF-NR is ≈175 m 2 g −1 , which is much higher than that for SNCF (≈74 m 2 g −1 ). We determines the ECSA through electrochemical double-layer capacitance (C dl ) measurements, as obtained by a cyclic voltammetry (CV) method ( Figure S8, Supporting Information).…”

Section: Mechanism Study: the Origin Of Enhanced Oer/her Performancementioning

confidence: 99%

A Perovskite Nanorod as Bifunctional Electrocatalyst for Overall Water Splitting

Zhu

Zhou

Zhong

et al. 2016

Advanced Energy Materials

408

335

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The development of highly efficient and low‐cost electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is paramount for water splitting associated with the storage of clean and renewable energy. Here, this study reports its findings in the development of a nanostructured perovskite oxide as OER/HER bifunctional electrocatalyst for overall water splitting. Prepared by a facile electrospinning method, SrNb0.1Co0.7Fe0.2O3–δ perovskite nanorods (SNCF‐NRs) display excellent OER and HER activity and stability in an alkaline solution, benefiting from the catalytic nature of perovskites and unique structural features. More importantly, the SNCF‐NR delivers a current density of 10 mA cm−2 at a cell voltage of merely ≈1.68 V while maintaining remarkable durability when used as both anodic and cathodic catalysts in an alkaline water electrolyzer. The performance of this bifunctional perovskite material is among the best ever reported for overall water splitting, offering a cost‐effective alternative to noble metal based electrocatalysts.

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Section: Mechanism Study: the Origin Of Enhanced Oer/her Performancementioning

confidence: 99%

A Perovskite Nanorod as Bifunctional Electrocatalyst for Overall Water Splitting

Zhu

Zhou

Zhong

et al. 2016

Advanced Energy Materials

408

335

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“…In this work, for the first time, we employed different nitrogen/carbon precursors to prepare various Fe‐N‐C catalysts with an aim to tuning catalyst morphology and structure, which will further link with catalyst activity and stability. Among available precursors, three often studied, that is, polyaniline (PANI), dicyandiamide (DCDA), melamine (MLMN), were identified to be effective to yield sufficient ORR catalytic activity. Although these precursors have been investigated individually, a comparative study of catalyst morphology and performance from various binary combinations under similar reaction conditions has not been done yet.…”

Section: Introductionmentioning

confidence: 98%

Engineering Favorable Morphology and Structure of Fe‐N‐C Oxygen‐Reduction Catalysts through Tuning of Nitrogen/Carbon Precursors

et al. 2017

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Structures and morphologies of Fe-N-C catalysts are believed to be crucial because of the number of active sites and local bonding structures governing the overall catalyst performance for the oxygen reduction reaction (ORR). However, the knowledge how to rationally design catalysts is still lacking. By combining different nitrogen/carbon precursors, including polyaniline (PANI), dicyandiamide (DCDA), and melamine (MLMN), we aim to tune catalyst morphology and structure to facilitate the ORR. Instead of the commonly studied single precursors, multiple precursors were used during the synthesis; this provides a new opportunity to promote catalyst activity and stability through a likely synergistic effect. The best-performing Fe-N-C catalyst derived from PANI+DCDA is superior to the individual PANI or DCDA-derived ones. In particular, when compared to the extensively explored PANI-derived catalysts, the binary precursors have an increased half-wave potential of 0.83 V and an enhanced electrochemical stability in challenging acidic media, indicating a significantly increased number of active sites and strengthened local bonding structures. Multiple key factors associated with the observed promotion are elucidated, including the optimal pore size distribution, highest electrochemically active surface area, presence of dominant amorphous carbon, and thick graphitic carbon layers with more pyridinic nitrogen edge sites likely bonded with active atomic iron.

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“…[103,104] Goodenough et al demonstrate excellent performance of NiCo nanoparticles anchored on porous fibrous carbon aerogels (NiCo/PFC aerogels) as bifunctional ORR/ OER catalysts, as shown in Figure 11c. [103] This material is designed and synthesized using K 2 Ni(CN) 4 /K 3 Co-(CN) 6 -chitosan hydrogel as processors.…”

Section: (Alloyed)metal/n-doped Carbonmentioning

confidence: 99%

“…Wu et al further reported ultralarge sized N doped graphene tubes (N-GTs) (>500 nm) decorated with FeCoNi alloy particles for bifunctional ORR/OER. [104] These tubes are prepared from an inexpensive precursor, dicyandiamide, via a template free graphitization process. The ORR/OER activity and the stability of these graphene tube catalysts depend strongly on the transition metal precursors.…”

Section: (Alloyed)metal/n-doped Carbonmentioning

confidence: 99%

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Huang

Wang

Peng

et al. 2017

Advanced Energy Materials

676

448

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the two most important reactions in rechargeable metal‐air battery, a promising technology to meet the energy requirements for various applications. The development of low‐cost, highly efficient and stable bifunctional ORR/OER catalysts is critical for a large‐scale application of this technology. In this review, the authors first introduce the fundamentals of bifunctional ORR/OER electrocatalysis in alkaline electrolyte. Various types of nanostructured materials as bifunctional ORR/OER catalysts including metal oxide, hydroxide and sulfide, functional carbon material, metal, and their composites are then reviewed. The crucial factors that can be used to tune the activity of the catalyst towards ORR/OER are summarized, including (1) phase, morphology, crystal facet, defect, mixed‐metal and strain engineering for metal oxide; (2) heteroatom doping, topological defects, and formation of metal‐N‐C structure for carbon material; (3) alloy effect for metal. These experiences lay the foundation for large scale application of metal‐air battery and can also effectively guide the rational design of catalysts for other electrocatalytic reactions.

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Highly Active and Stable Graphene Tubes Decorated with FeCoNi Alloy Nanoparticles via a Template‐Free Graphitization for Bifunctional Oxygen Reduction and Evolution

Cited by 236 publications

References 58 publications

A Perovskite Nanorod as Bifunctional Electrocatalyst for Overall Water Splitting

A Perovskite Nanorod as Bifunctional Electrocatalyst for Overall Water Splitting

Engineering Favorable Morphology and Structure of Fe‐N‐C Oxygen‐Reduction Catalysts through Tuning of Nitrogen/Carbon Precursors

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

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