NiCo<sub>2</sub>S<sub>4</sub>@graphene as a Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

Li, Qiao; Jin, Jutao; Zhang, Junyan

doi:10.1021/am4007897

Cited by 653 publications

(435 citation statements)

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“…The Co—S/SNGA nanostructure showed the best performance compared with other Ni—Co—S/SNGA nanostructures, Co—S nanoparticles, and Co—S/GA, with the onset potential of 1.0 V versus RHE and limiting current density of 4.6 mA cm −2 . As reported, with the increase of Ni 3+ parts in Ni—Co—S, the ORR catalysts show poorer performance 58. The electron transfer number of Co—S/SNGA ranged from 3.8 to 3.95 during the voltage range of 0.2–0.8 versus RHE, revealing the four‐electron pathway reaction.…”

Section: Resultsmentioning

confidence: 64%

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

et al. 2016

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Metal sulfides are commonly used in energy storage and electrocatalysts due to their redox centers and active sites. Most literature reports show that their performance decreases significantly caused by oxidation in alkaline electrolyte during electrochemical testing. Herein, S and N co‐doped graphene‐based nickel cobalt sulfide aerogels are synthesized for use as rechargeable alkaline battery electrodes and oxygen reduction reaction (ORR) catalysts. Notably, this system shows improved cyclability due to the stabilization effect of the S and N co‐doped graphene aerogel (SNGA). This reduces the rate of oxidation and the decay of electronic conductivity of the metal sulfides materials in alkaline electrolyte, i.e., the capacity decrease of CoNi2S4/SNGA is 4.2% for 10 000 cycles in a three‐electrode test; the current retention of 88.6% for Co—S/SNGA after 12 000 s current–time chronoamperometric response in the ORR test is higher than corresponding Co—S nanoparticles and Co—S/non‐doped graphene aerogels. Importantly, the results here confirm that the Ni—Co—S ternary materials behave as an electrode for rechargeable alkaline batteries rather than supercapacitors electrodes in three‐electrode test as commonly described and accepted in the literature. Furthermore, formulas to evaluate the performance of hybrid battery devices are specified.

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Section: Resultsmentioning

confidence: 64%

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

et al. 2016

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“…[33,61,[107][108][109][110] The carbonaceous materials can effectively prevent the agglomeration of nanoscale MMSs, promote electron transport, increase the electroactive sites, and enhance the stability of MMSs.…”

Section: Wwwadvenergymatdementioning

confidence: 99%

“…In particular, some MMSs have shown great potential as bifunctional electrocatalysts for MABs and water splitting. [31][32][33] On the other hand, it has been well documented that the performance of electrochemical energy storage and conversion devices depends highly on the crystalline phase, composition, structural and morphological features, size of the electroactive materials, and the architecture of electrodes. [4,14,[34][35][36][37] Therefore, considerable research efforts have been devoted to the rational design and synthesis of MMSs as well as the smart design of the architecture of MMS-based electrodes.…”

Section: Introductionmentioning

confidence: 99%

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

Lou

2017

Advanced Energy Materials

707

319

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Mixed metal sulfides (MMSs) have attracted increased attention as promising electrode materials for electrochemical energy storage and conversion systems including lithium‐ion batteries (LIBs), sodium‐ion batteries (SIBs), hybrid supercapacitors (HSCs), metal–air batteries (MABs), and water splitting. Compared with monometal sulfides, MMSs exhibit greatly enhanced electrochemical performance, which is largely originated from their higher electronic conductivity and richer redox reactions. In this review, recent progresses in the rational design and synthesis of diverse MMS‐based micro/nanostructures with controlled morphologies, sizes, and compositions for LIBs, SIBs, HSCs, MABs, and water splitting are summarized. In particular, nanostructuring, synthesis of nanocomposites with carbonaceous materials and fabrication of 3D MMS‐based electrodes are demonstrated to be three effective approaches for improving the electrochemical performance of MMS‐based electrode materials. Furthermore, some potential challenges as well as prospects are discussed to further advance the development of MMS‐based electrode materials for next‐generation electrochemical energy storage and conversion systems.

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“…[76] . Nazar 等 (4) 复合金属硫化物: 近年来已有研究表明具有尖晶石型结构的硫化物同样能够催化氧还原反应 [78,79] . Wang 等 [80] 3.3 功能化碳材料近年来, 功能化碳材料作为最有希望代替 Pt 的非贵金属催化剂一直被广泛研究, 主要有金属有机大环化合物和杂原子掺杂的碳材料.…”

Section: 复合金属氧化物/硫化物unclassified

Progress in Oxygen Reduction Reaction Electrocatalysts for Metal-Air Batteries

Wang¹,

Zhang²,

Hu³

2015

Acta Chim. Sinica

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With the intensification of the global energy crisis and the deterioration of ecological environment, the exploitation and utilization of sustainable energy have gained more attention. Metal-air battery as a kind of high-performance green energy may become one of the most promising next-generation battery technologies. Compared to conventional storage batteries such as Zn-Mn and lead-acid batteries, metal-air battery has higher theoretical energy density, especially Li-air battery with an extremely high theoretical density 3505 Wh/kg. Such high energy density is due to the fact that oxygen is not stored in the cell. Other advantages include stable potential, low cost and environmental friendship. However, there are many important factors that limit its commercial application. Among them, a critical issue is the sluggish kinetics of cathodic oxygen reduction reaction (ORR), so it is necessary to develop ORR catalytic materials for enhancing the kinetics. Recently, there are many researches about ORR catalysts. In addition to a brief introduction of the reaction mechanism of ORR, the paper introduced the current research progress of four groups of cathodic catalysts including noble metal and its alloys, transition-metal oxides/sulfides, functional carbon materials and metal nitrides. However, there are still many problems, such as the lack of fundamental mechanistic study, high cost of Pt-based catalyst, uncertain active site of functional carbon materials and low activity for non-noble metal catalysts. In summary, great efforts should be needed. Based on this, the authors pointed out the development direction for ORR catalysts. The future research direction of cathodic catalysts would include: (1) researching the elusive oxygen reaction mechanism and defining the active sites, (2) studying the effect of physical structure parameters (e.g., structure, morphology, size) on the activity and optimizing synthesis conditions of catalysts to obtain better activity and stability, (3) developing novel efficient and inexpensive catalysts in according to the oxygen reaction mechanism.

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NiCo₂S₄@graphene as a Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

Cited by 653 publications

References 49 publications

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

Progress in Oxygen Reduction Reaction Electrocatalysts for Metal-Air Batteries

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NiCo2S4@graphene as a Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions

Cited by 653 publications

References 49 publications

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

S, N‐Co‐Doped Graphene‐Nickel Cobalt Sulfide Aerogel: Improved Energy Storage and Electrocatalytic Performance

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

Progress in Oxygen Reduction Reaction Electrocatalysts for Metal-Air Batteries

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NiCo₂S₄@graphene as a Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions