Communication—Synthesis of Self-Doped Metal-Free Electrocatalysts from Waste Leather with High ORR Activity

2015 ◽  
Vol 163 (2) ◽  
pp. H15-H17 ◽  
Author(s):  
D. Lardizabal-Guitierrez ◽  
D. González-Quijano ◽  
P. Bartolo-Pérez ◽  
B. Escobar-Morales ◽  
F. J. Rodríguez-Varela ◽  
...  
Keyword(s):  
Metal Free ◽  
Orr Activity ◽  
Communication Synthesis

Metal–organic framework templated nitrogen and sulfur co-doped porous carbons as highly efficient metal-free electrocatalysts for oxygen reduction reactions

2014 ◽  
Vol 2 (18) ◽  
pp. 6316-6319 ◽  
Author(s):  
Jisen Li ◽  
Yuyun Chen ◽  
Yujia Tang ◽  
Shunli Li ◽  
Huiqing Dong ◽  
...  
Keyword(s):  
Porous Material ◽  
Oxygen Reduction ◽  
Metal Organic Framework ◽  
Porous Carbons ◽  
Oxygen Reduction Reactions ◽  
Metal Free ◽  
Highly Efficient ◽  
Metal Organic ◽  
Orr Activity ◽  
Co Doped

A novel MOF-templated nitrogen and sulphur co-doped porous material has been first synthesized. The representative NS(3 : 1)–C-MOF-5 shows high ORR activity, even comparable to commercial Pt–C.

Nonporous MOF-derived dopant-free mesoporous carbon as an efficient metal-free electrocatalyst for the oxygen reduction reaction

2016 ◽  
Vol 4 (24) ◽  
pp. 9370-9374 ◽  
Author(s):  
Xin Wang ◽  
Xingyue Li ◽  
Canbin Ouyang ◽  
Zhen Li ◽  
Shuo Dou ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Specific Surface ◽  
Oxygen Reduction ◽  
Mesoporous Carbon ◽  
Mesoporous Structure ◽  
Reduction Reaction ◽  
High Specific Surface Area ◽  
Metal Free ◽  
Electrocatalytic Oxygen Reduction ◽  
Orr Activity

Dopant-/metal-free mesoporous carbon has been prepared from nonporous MOFs, which is highly efficient for the electrocatalytic oxygen reduction reaction (ORR). The excellent ORR activity is attributed to both high specific surface area and mesoporous structure.

Three-dimensional N,B-doped graphene aerogel as a synergistically enhanced metal-free catalyst for the oxygen reduction reaction

2015 ◽  
Vol 17 (38) ◽  
pp. 25440-25448 ◽  
Author(s):  
Congcong Xu ◽  
Yan Su ◽  
Dajun Liu ◽  
Xingquan He
Keyword(s):  
Oxygen Reduction Reaction ◽  
Hydrothermal Reaction ◽  
Three Dimensional ◽  
Reduction Reaction ◽  
Graphene Aerogel ◽  
Good Tolerance ◽  
Metal Free ◽  
Doped Graphene ◽  
Orr Activity ◽  
Excellent Stability

A novel two-step strategy including a hydrothermal reaction and pyrolysis procedure was developed for the preparation of a robust N,B-codoped GA catalyst with superior ORR activity, good tolerance of methanol crossover and excellent stability.

Enriched graphitic N in nitrogen-doped graphene as a superior metal-free electrocatalyst for the oxygen reduction reaction

2018 ◽  
Vol 42 (24) ◽  
pp. 19665-19670 ◽  
Author(s):  
Xiangyu Lu ◽  
Dan Wang ◽  
Liping Ge ◽  
Lihui Xiao ◽  
Haiyan Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Active Center ◽  
Reduction Reaction ◽  
Key Factors ◽  
Total N ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Orr Activity

The active center of N-G catalysts for ORR is confirmed to be related to the graphitic N, and the total N content in N-G catalysts is not the key factors to determine the ORR activity.

scholarly journals Probing Active Sites on Metal-Free, Nitrogen-Doped Carbons for Oxygen Electroreduction: A Review

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 509 ◽  
Author(s):  
Ni Zhou ◽  
Nan Wang ◽  
Zexing Wu ◽  
Ligui Li
Keyword(s):  
Active Sites ◽  
Catalytic Mechanism ◽  
Low Cost ◽  
Polymer Electrolyte Membrane ◽  
Precious Metals ◽  
Reduction Reaction ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Electrolyte Membrane ◽  
Orr Activity

The Metal-free nitrogen-doped carbons represent an emerging low-cost nonprecious electrocatalyst for oxygen reduction reaction (ORR) that is a sluggish process at the cathode of polymer electrolyte membrane fuel cells (PEMFCs) and a verity of metal-air batteries. During the past few years, the ORR catalytic activity of nitrogen-doped carbons has been significantly increased, making them highly competitive alternatives to conventional precious metals based electrocatalysts for ORR. However, controversies remain in the unambiguous identification of the ORR active sites on nitrogen-doped carbons. This review summarizes the recent progress in probing the potential active sites on metal-free nitrogen-doped carbons for ORR, aiming to gain in-depth understanding of the ORR catalytic mechanism on nitrogen-doped carbons for further enhancing ORR activity.

scholarly journals N- and S-doped mesoporous carbon as metal-free cathode catalysts for direct biorenewable alcohol fuel cells

2016 ◽  
Vol 4 (1) ◽  
pp. 83-95 ◽  
Author(s):  
Yang Qiu ◽  
Jiajie Huo ◽  
Fan Jia ◽  
Brent. H. Shanks ◽  
Wenzhen Li
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Surface Area ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
Half Cell ◽  
Cathode Catalysts ◽  
Metal Free ◽  
Alcohol Fuel ◽  
Orr Activity

N and S dual-doped carbon materials, N-S-CMK-3, are fabricated with >1000 m2 g−1 surface area and uniform mesoporous and macroporous structures, and exhibit outstanding ORR activity and durability in both half cell and direct biorenewable alcohol fuel cell tests.

Oxidized carbon nanotubes as an efficient metal-free electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41901-41904 ◽  
Author(s):  
Xin Wang ◽  
Canbin Ouyang ◽  
Shuo Dou ◽  
Dongdong Liu ◽  
Shuangyin Wang
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Functional Groups ◽  
Reduction Reaction ◽  
Metal Free ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes ◽  
Orr Activity

Acid treated method can efficiently incorporate a large number of oxygen containing functional groups including –OH, –COOH, CO which play a key role in the enhancement of ORR activity.

High-rate oxygen electroreduction over metal-free graphene foams embedding P–N coupled moieties in acidic media

2018 ◽  
Vol 6 (9) ◽  
pp. 4145-4151 ◽  
Author(s):  
Congling Li ◽  
Zhengyan Chen ◽  
Aiguo Kong ◽  
Yangyang Ni ◽  
Fantao Kong ◽  
...  
Keyword(s):  
Carbon Matrix ◽  
Oxygen Electroreduction ◽  
High Rate ◽  
Acidic Media ◽  
Metal Free ◽  
Free Graphene ◽  
Orr Activity ◽  
Carbon Catalysts ◽  
Graphene Foams

Metal-free P,N-doped carbon catalysts with coupled P–N sites in the carbon matrix demonstrated efficient ORR activity in acidic media.

The Shadow Widths of Very Small Particles are Formed Independently of the Metal Cap Build Up on the Particle

1981 ◽  
Vol 39 ◽  
pp. 568-569
Author(s):  
George C. Ruben
Keyword(s):  
Gold Particle ◽  
Film Surface ◽  
Small Particles ◽  
Geometric Process ◽  
Metal Free ◽  
Shadow Area

The formation of shadows behind small particles has been thought to be a geometric process (GP) where the metal cap build up on the particle creates a shadow width the same size as or larger than the particle. This GP cannot explain why gold particle shadow widths are generally larger than the gold particle and may have no appreciable metal cap build up (fig. 1). Ruben and Telford have suggested that particle shadow widths are formed by the width dependent deflection of shadow metal (SM) lateral to and infront of the particle. The trajectory of the deflected SM is determined by the incoming shadow angle (45°). Since there can be up to 1.4 times (at 45°) more SM directly striking the particle than the film surface, a ridge of metal nuclei lateral to and infront of the particle can be formed. This ridge in turn can prevent some SM from directly landing in the metal free shadow area. However, the SM that does land in the shadow area (not blocked by the particle or its ridge) does not stick and apparently surface migrates into the SM film behind the particle.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

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