A robust electrocatalytic activity toward the hydrogen evolution reaction from W/W2C heterostructured nanoparticles coated with a N,P dual-doped carbon layer

2019 ◽  
Vol 55 (65) ◽  
pp. 9665-9668 ◽  
Author(s):  
Quan Zhang ◽  
Fang Luo ◽  
Hao Hu ◽  
Ruizhi Xu ◽  
Konggang Qu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Electrocatalytic Activity ◽  
Carbon Layer ◽  
Cathodic Current Density ◽  
Cathodic Current ◽  
Alkaline Electrolytes

W/W2C heterostructured nanoparticles encapsulated by N,P dual-doped carbon require low overpotentials of 55 mV and 82 mV vs. RHE to achieve cathodic current density of 10 mA cm−2 in acidic and alkaline electrolytes, respectively.

scholarly journals Atomic Pt-Clusters Decoration Triggers a High-Rate Performance on Ni@Pd Bimetallic Nanocatalyst for Hydrogen Evolution Reaction in Both Alkaline and Acidic Medium

2020 ◽  
Vol 10 (15) ◽  
pp. 5155 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Sheng-Po Wang ◽  
Shuan Lin ◽  
Che Yan ◽  
Kuan-Wen Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Acidic Medium ◽  
Lattice Mismatch ◽  
Cathodic Current Density ◽  
Green Energy ◽  
High Rate ◽  
Pt Catalyst ◽  
Cathodic Current

The development of inexpensive and highly robust nanocatalysts (NCs) to boost electrochemical hydrogen evolution reaction (HER) strengthens the implementation of several emerging sustainable-energy technologies. Herein, we proposed a novel nano-architecture consisting of a hierarchical structured Ni@Pd nanocatalyst with Pt-clusters decoration on the surface (denoted by Ni@Pd-Pt) for HER application in acidic (0.5 M H2SO4) and alkaline (0.1 M KOH) mediums. The Ni@Pd-Pt NC is fabricated on a carbon black support via a “self-aligned” heterogeneous nucleation-crystal growth mechanism with 2 wt.% Pt-content. As-prepared Ni@Pd-Pt NC outperforms the standard Pt/C (30 wt.% Pt) catalyst in HER and delivers high-rate catalytic performance with an ultra-low overpotential (11.5 mV) at the cathodic current density of 10 mA∙cm−2 in alkaline medium, which is 161.5 mV and 14.5 mV less compared to Ni@Pd (173 mV) and standard Pt/C (26 mV) catalysts, respectively. Moreover, Ni@Pd-Pt NC achieves an exactly similar Tafel slope (42 mV∙dec−1) to standard Pt/C, which is 114 mV∙dec−1 lesser when compared to Ni@Pd NC. Besides, Ni@Pd-Pt NC exhibits an overpotential value of 37 mV at the current density of 10 mA cm−2 in acidic medium, which is competitive to standard Pt/C catalyst. By utilizing physical characterizations and electrochemical analysis, we demonstrated that such an aggressive HER activity is dominated by the increased selectivity during HER due to the reduced competition between intermediate products on the non-homogeneous NC surface. This phenomenon can be rationalized by electron localization owing to the electronegative difference (χPt > χPd > χNi) and strong lattice mismatch at the Ni@Pd heterogeneous binary interfaces. We believe that the obtained results will significantly provide a facile design strategy to develop next-generation heterogenous NCs for HER and related green-energy applications

MOF-derived nanostructured cobalt phosphide assemblies for efficient hydrogen evolution reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90265-90271 ◽  
Author(s):  
Lili Li ◽  
Xingyue Li ◽  
Lunhong Ai ◽  
Jing Jiang
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
High Performance ◽  
Cathodic Current Density ◽  
Cathodic Current ◽  
Zeolitic Imidazolate Framework ◽  
Cobalt Phosphide ◽  
Low Overpotential

Zeolitic imidazolate framework-67 derived nanostructured CoP assemblies exhibited high-performance for electrochemical HER, as manifested by a low overpotential, a large cathodic current density and an excellent durability.

Molybdenum carbide nanocrystal embedded N-doped carbon nanotubes as electrocatalysts for hydrogen generation

2015 ◽  
Vol 3 (11) ◽  
pp. 5783-5788 ◽  
Author(s):  
Kai Zhang ◽  
Yang Zhao ◽  
Diyu Fu ◽  
Yujin Chen
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Molybdenum Carbide ◽  
Hydrogen Generation ◽  
Cathodic Current Density ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Cathodic Current

Highly conductive N-doped carbon nanotubes embedded with molybdenum carbide nanocrystals with a size less than 3 nm exhibit superior activity for the hydrogen evolution reaction, including small overpotential, large cathodic current density and high exchange current density.

Graphene oxide supported cobalt phosphide nanorods designed from a molecular complex for efficient hydrogen evolution at low overpotential

2019 ◽  
Vol 55 (15) ◽  
pp. 2186-2189 ◽  
Author(s):  
Alpesh K. Sharma ◽  
Hemant Joshi ◽  
Kasinath Ojha ◽  
Ajai K. Singh
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Evolution ◽  
Current Density ◽  
Molecular Complex ◽  
Cathodic Current Density ◽  
Cathodic Current ◽  
Cobalt Phosphide ◽  
Low Overpotential

The cathodic current density (cd) of GO-Co2P is 20/100 mA cm−2 at an overpotential of 80/154 mV. At 100 mA cm−2 cd, stability is observed for 70 h.

NiRu nanoparticles encapsulated in a nitrogen-doped carbon matrix as a highly efficient electrocatalyst for the hydrogen evolution reaction

2020 ◽  
Vol 49 (39) ◽  
pp. 13647-13654 ◽  
Author(s):  
Shikai Xu ◽  
Zhiqiang Li ◽  
Kainian Chu ◽  
Ge Yao ◽  
Yang Xu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Carbon Matrix ◽  
Nitrogen Doped ◽  
Highly Efficient ◽  
Alkaline Electrolytes ◽  
Nitrogen Doped Carbon

We synthesize ultrafine NiRu nanoparticles embedded in a nitrogen-doped carbon matrix through direct carbonization of Ru-doped Ni-based MOFs. As expected, NiRu2@NC-600 exhibits superior electrocatalytic activity for the HER in acidic and alkaline electrolytes.

scholarly journals Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 85 ◽  
Author(s):  
Edita Vernickaitė ◽  
Oksana Bersirova ◽  
Henrikas Cesiulis ◽  
Natalia Tsyntsaru
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Active Sites ◽  
Ammonium Acetate ◽  
Alkaline Media ◽  
Molar Ratio ◽  
Cathodic Current ◽  
Catalytic Behavior

The given research was driven by prospects to design Mo-rich coatings with iron group metals electrodeposited from a highly saturated ammonium acetate bath. The obtained coatings could be employed as prominent electrodes for the hydrogen evolution reaction (HER). It was found that the Mo content in Ni–Mo alloys can be tuned from 30 to 78 at.% by decreasing the molar ratio [Ni(II)]:[Mo(VI)] in the electrolyte from 1.0 to 0.25 and increasing the cathodic current density from 30 to 100 mA/cm2. However, dense cracks and pits are formed due to hydrogen evolution at high current densities and that diminishes the catalytic activity of the coating for HER. Accordingly, smoother and crack-free Ni–54 at.% Mo, Co–52 at.% Mo and Fe–54 at.% Mo alloys have been prepared at 30 mA/cm2. Their catalytic behavior for HER has been investigated in a 30 wt.% NaOH solution at temperatures ranging from 25 to 65 °C. A significant improvement of electrocatalytic activity with increasing bath temperature was noticed. The results showed that the sequence of electrocatalytic activity in alkaline media decreases in the following order: Co–52 at.% Mo > Ni–54 at.% Mo > Fe–54 at.% Mo. These peculiarities might be linked with different catalytic behavior of formed intermetallics (and active sites) in electrodeposited alloys. The designed electrodeposited Mo-rich alloys have a higher catalytic activity than Mo and Pt cast metals.

P doped Co2Mo3Se nanosheets grown on carbon fiber cloth as an efficient hybrid catalyst for hydrogen evolution

2017 ◽  
Vol 5 (24) ◽  
pp. 12043-12047 ◽  
Author(s):  
Yaxiao Guo ◽  
Zhaoyang Yao ◽  
Changshuai Shang ◽  
Erkang Wang
Keyword(s):  
Carbon Fiber ◽  
Hydrogen Evolution ◽  
Current Density ◽  
Synergistic Effects ◽  
Cathodic Current Density ◽  
Hybrid Catalyst ◽  
Cathodic Current ◽  
Tafel Slope ◽  
Carbon Fiber Cloth ◽  
Excellent Cycling Stability

Owing to the prominent synergistic effects, P-Co2Mo3Se/CFC hybrid catalyst exhibits a superior HER activity with a small overpotential of 71 mV at cathodic current density of 10 mA cm−2, and a small Tafel slope of 43.6 mV dec−1, as well as excellent cycling stability.

scholarly journals Pencil Graphite Electrodes Decorated with Platinum Nanoparticles as Efficient Electrocatalysts for Hydrogen Evolution Reaction

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 73
Author(s):  
Lorena-Cristina Balint ◽  
Iosif Hulka ◽  
Andrea Kellenberger
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Platinum Nanoparticles ◽  
Electrocatalytic Activity ◽  
Linear Sweep Voltammetry ◽  
Alternative Methods ◽  
Graphite Electrodes ◽  
Electrochemically Deposited ◽  
Current Densities

Platinum-based materials are widely known as the most utilized and advanced catalysts for hydrogen evolution reaction. For this reason, several studies have reported alternative methods of incorporating this metal into more economical electrodes with a carbon-based support material. Herein, we report on the performance of pencil graphite electrodes decorated with electrochemically deposited platinum nanoparticles as efficient electrocatalysts for hydrogen evolution reaction. The electrodeposition of platinum was performed via pulsed current electrodeposition and the effect of current density on the electrocatalytic activity was investigated. The obtained electrodes were characterized using cyclic voltammetry, while the electrocatalytic activity was assessed through linear sweep voltammetry. Field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy were utilised to gain an insight into surface morphology and chemical analysis of platinum nanoparticles. The best performing electrocatalyst, at both low and high current densities, was characterized by the highest exchange current density of 1.98 mA cm−2 and an ultralow overpotential of 43 mV at a current density of 10 mA cm−2. The results show that, at low current densities, performances closest to that of platinum can be achieved even with an ultralow loading of 50 µg cm−2 Pt.

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.

Hierarchically porous FeNi3@FeNi layered double hydroxide nanostructures: One-step fast electrodeposition and highly efficient electrocatalytic performances for overall water splitting

2021 ◽  
Author(s):  
Zihao Liu ◽  
Shifeng Li ◽  
Fangfang Wang ◽  
Mingxia Li ◽  
Yonghong Ni
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Hierarchically Porous ◽  
One Step ◽  
Double Hydroxide

FeNi-layered double hydroxide (LDH) is thought to be an excellent electrocatalyst for oxygen evolution reaction (OER), but it always shows extremely poor electrocatalytic activity toward hydrogen evolution reaction (HER) in...

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