Superior performance of borocarbonitrides, BxCyNz, as stable, low-cost metal-free electrocatalysts for the hydrogen evolution reaction

2016 ◽  
Vol 9 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Manjeet Chhetri ◽  
Somak Maitra ◽  
Himanshu Chakraborty ◽  
Umesh V. Waghmare ◽  
C. N. R. Rao
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Low Cost ◽  
Superior Performance ◽  
Metal Free

We report superior hydrogen evolution activity of metal-free borocarbonitride (BCN) catalysts.

Mixed MoS2/MoO3 Nanostructures for Hydrogen Evolution Reaction

2021 ◽  
Vol 21 (4) ◽  
pp. 2500-2510
Author(s):  
Umair Aftab ◽  
Hamza Majeed Ansari ◽  
Muhammad Ishaque Abro ◽  
Muhmmad Moazam Baloch ◽  
Sirajuddin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Low Cost ◽  
Future Generation ◽  
Superior Performance ◽  
Sulfur Source ◽  
The Future ◽  
Earth Abundant ◽  
Future Technologies

The electrolysis of water has paved the way towards a clean, efficient and renewable energy source for the future technologies. Therefore, an efficient electrocatalyst is needed. MoS2 based nonprecious materials are earth-abundant, low cost and promising for the hydrogen evolution reaction. In this study, the effect of sulfur source on the catalytic properties of the MoS2 nanostructures is investigated. Two different sulfur precursors (i.e., thiourea and L-cysteine) were used for the synthesis of MoS2 nanostructures. The optimization of the sulfur precursor content was carried out to report the best for the development of the future generation of HER catalysts. The cysteine assisted synthesis results the mixed MoO3/MoS2 composite structure which has shown significant effect on the catalytic activity. The low concentrations of cysteine and thiourea have shown excellent catalytic activity and stability in 0.5 M H2SO4. TheMoS2 nanostructures with the cysteine as sulfur precursor have shown low Tafel slope of 81 mV dec-1 and a current density of 30 mA cm-2 is obtained at 0.45 V versus RHE. The superior performance of cysteine-based MoS2 sample is due to the rapid charge transfer as confirmed by EIS and excellent conductivity as witnessed by low optical band gap. These findings strengthen the understanding of fundamental science of Mo-based catalysts for the development of the future generation of electrocatalysts and energy conversion technologies.

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

scholarly journals A monodispersed CuPt alloy: synthesis and its superior catalytic performance in the hydrogen evolution reaction over a full pH range

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12470-12475
Author(s):  
Xinmei Liu ◽  
Chen Liang ◽  
Wenlong Yang ◽  
Chunyang Yang ◽  
Jiaqi Lin ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Stability ◽  
Low Cost ◽  
Catalytic Performance ◽  
Ph Range

An effective approach to achieve the low cost and high stability of electro-catalysts for HER.

Hydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system

2021 ◽  
Vol 372 ◽  
pp. 137859
Author(s):  
Leyla Gidi ◽  
Roxana Arce ◽  
José Ibarra ◽  
M. Isaacs ◽  
M.J. Aguirre ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Free System ◽  
Metal Free

Strategies on regulating Zn2+ solvation structure for dendrites-free and side reactions-suppressed zinc-ion batteries

2022 ◽  
Author(s):  
Jin Cao ◽  
Dongdong Zhang ◽  
Xinyu Zhang ◽  
Zhiyuan Zeng ◽  
Jiaqian Qin ◽  
...  
Keyword(s):  
Energy Storage ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Low Cost ◽  
Zinc Ion ◽  
Side Reactions ◽  
Solvation Structure ◽  
Dendrites Growth

High‐safety and low‐cost aqueous zinc‐ion batteries (ZIBs) are an exceptionally compelling technology for grid‐scale energy storage, whereas the corrosion, hydrogen evolution reaction and dendrites growth of Zn anodes plague their...

Controllable synthesis of Mo2C with different morphology and application to electrocatalytic hydrogen evolution reaction

2021 ◽  
Author(s):  
He-qiang Chang ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Structural Design ◽  
Superior Performance ◽  
Controllable Synthesis ◽  
Nitridation Reaction ◽  
Special Surface ◽  
One Step ◽  
The One ◽  
Insight Into

Abstract In order to evaluate the effect of precursors and synthesis strategies on catalytic ability of Mo2C in the hydrogen evolution reaction (HER), four kinds of Mo2C were synthesized using two kinds of MoO3 by two strategies. Compared with the one-step direct carbonization strategy, Mo2C with a large special surface area and a better performance could be synthesized by the two-step strategy composed of a nitridation reaction and a carbonization reaction. Additionally, the as-prepared porous Mo2C nanobelts (NBs) exhibit good electrocatalytic performance with a small overpotential of 165 mV (0.5 M H2SO4) and 124 mV (1 M KOH) at 10 mA cm-2, as well as a Tafel slope of 58 mV dec-1 (0.5 M H2SO4) and 59 mV dec-1 (1 M KOH). The excellent catalytic activity is ascribed to the nano crystallites and porous structure. What’s more, the belt structure also facilitates the charge transport in the materials during the electrocatalytic HER process. Therefore, the two-step strategy provides a new insight into the structural design with superior performance for electrocatalytic HER.

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