scholarly journals Facile synthesis of Ni3S2/rGO nanosheets composite on nickel foam as efficient electrocatalyst for hydrogen evolution reaction in alkaline media

2017 ◽  
Vol 33 (5) ◽  
pp. 519-527 ◽  
Author(s):  
Binhong He ◽  
Minjie Zhou ◽  
Zhaohui Hou ◽  
Gangyong Li ◽  
Yafei Kuang
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Alkaline Media ◽  
Facile Synthesis ◽  
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Abstract

In situ electro-oxidation modulation of Ru(OH)x/Ag supported on nickel foam for efficient hydrogen evolution reaction in alkaline media

2019 ◽  
Vol 44 (39) ◽  
pp. 21683-21691 ◽  
Author(s):  
Xin-Yu Zhang ◽  
Bao-Yu Guo ◽  
Feng-Ting Li ◽  
Bin Dong ◽  
Jia-Qi Zhang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Alkaline Media ◽  
Electro Oxidation

scholarly journals Facile Synthesis of PdCuRu Porous Nanoplates as Highly Efficient Electrocatalysts for Hydrogen Evolution Reaction in Alkaline Medium

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1451
Author(s):  
Changhong Chen ◽  
Ningkang Qian ◽  
Junjie Li ◽  
Xiao Li ◽  
Deren Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solution ◽  
Current Density ◽  
Alkaline Media ◽  
Water Dissociation ◽  
Galvanic Replacement ◽  
Facile Synthesis ◽  
Better Than

Ru is a key component of electrocatalysts for hydrogen evolution reaction (HER), especially in alkaline media. However, the catalytic activity and durability of Ru-based HER electrocatalysts are still far from satisfactory. Here we report a solvothermal approach for the synthesis of PdCuRu porous nanoplates with different Ru compositions by using Pd nanoplates as the seeds. The PdCuRu porous nanoplates were formed through underpotential deposition (UPD) of Cu on Pd, followed by alloying Cu with Pd through interdiffusion and galvanic replacement between Cu atoms and Ru precursor simultaneously. When evaluated as HER electrocatalysts, the PdCuRu porous nanoplates exhibited excellent catalytic activity and durability. Of them, the Pd24Cu29Ru47/C achieved the lowest overpotential (40.7 mV) and smallest Tafel slope (37.5 mV dec−1) in an alkaline solution (much better than commercial Pt/C). In addition, the Pd24Cu29Ru47/C only lost 17% of its current density during a stability test for 10 h, while commercial Pt/C had a 59.5% drop under the same conditions. We believe that the electron coupling between three metals, unique porous structure, and strong capability of Ru for water dissociation are responsible for such an enhancement in HER performance.

A Mn-doped Ni2P nanosheet array: an efficient and durable hydrogen evolution reaction electrocatalyst in alkaline media

2017 ◽  
Vol 53 (80) ◽  
pp. 11048-11051 ◽  
Author(s):  
Ya Zhang ◽  
Yiwei Liu ◽  
Min Ma ◽  
Xiang Ren ◽  
Zhiang Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Efficiency ◽  
Nickel Foam ◽  
Alkaline Media ◽  
Nanosheet Array ◽  
Mn Doped

A Mn-doped Ni2P nanosheet array on nickel foam (Mn-Ni2P/NF) acts as a high-efficiency and durable electrocatalyst for the hydrogen evolution reaction in 1.0 M KOH, driving 20 mA cm−2 at an overpotential of 103 mV, which is 82 mV less than that for Ni2P/NF.

scholarly journals Enhancement of hydrogen evolution reaction kinetics in alkaline media by fast galvanic displacement of nickel with rhodium – from smooth surfaces to electrodeposited nickel foams

2021 ◽  
Author(s):  
Aleksandar Jovanović ◽  
Lazar Bijelić ◽  
Ana Dobrota ◽  
Natalia Skorodumova ◽  
Slavko Mentus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Alkaline Media ◽  
Nickel Surface ◽  
Hydrogen Binding ◽  
Galvanic Displacement ◽  
Alkaline Water Electrolysis ◽  
Spontaneous Deposition

Energy-efficient hydrogen production is one of the key factors for advancing the hydrogen-based economy. Alkaline water electrolysis is the main route for the production of high-purity hydrogen, but further improvements of hydrogen evolution reaction (HER) catalysts are still needed. Industrial alkaline electrolysis relies on Ni-based catalysts, and here we describe a drastic improvement of HER activity of Ni in alkaline media using several model catalysts for HER obtained upon nickel surface modification in aqueous solution of rhodium salts, when a spontaneous deposition of rhodium takes place based on the chemical displacement reaction 3Ni + 2Rh3+ = 3Ni2+ + 2Rh. In the case of smooth Ni-poly electrodes, HER activity surpasses the activity of Pt-poly already after 30 s of exchange with Rh. SEM analysis showed that Rh is uniformly distributed, while surface roughness changes within 10%, agreeing with electrochemical measurements. Furthermore, XPS analysis has shown effective incorporation of Rh in the surface, while DFT calculations suggest that hydrogen binding is significantly weakened on the Rh-modified Ni surfaces. Such tuning of the hydrogen binding energy is seen as the main factor governing HER activity improvements. The same galvanic displacement protocols were employed for nickel foam electrodes and electrodeposited Ni on Ti mesh. In both cases, somewhat longer Rh exchange times are needed to obtain superior activities than for the smooth Ni surface, but up to 10 min. HER overpotential corresponding to −10 mA cm−2 for nickel foam and electrodeposited Ni electrodes, after modification with Rh, amounted to only −0.07 and −0.09 V, respectively. Thus, it is suggested that a fast spontaneous displacement of Ni with Rh could effectively boost HER in alkaline media with minor cost penalties compared to energy saving in the electrolysis process.

Surface Strain Engineered Ni-NiO for Boosting Hydrogen Evolution Reaction in Alkaline Media

2021 ◽  
pp. 138985
Author(s):  
Xuerui Yi ◽  
Xiaobo He ◽  
Fengxiang Yin ◽  
Guoru Li ◽  
Zhichun Li
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Strain ◽  
Alkaline Media

Facile Synthesis of SnO2 Nanostructures for Enhanced Electrochemical Hydrogen Evolution Reaction

2021 ◽  
pp. 158597
Author(s):  
Yongming Zhang ◽  
Jing Zou ◽  
Zemin He ◽  
Yuzhen Zhao ◽  
Xiaoxi Kang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Sno2 Nanostructures ◽  
Facile Synthesis

Recasting Ni-foam into NiF2 nanorod arrays via a hydrothermal process for hydrogen evolution reaction application

2021 ◽  
Author(s):  
Nanasaheb M. Shinde ◽  
Siddheshwar D. Raut ◽  
Balaji G. Ghule ◽  
Krishna Chaitanya Gunturu ◽  
James J. Pak ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Hydrothermal Process ◽  
Reduction Process ◽  
Nanorod Arrays ◽  
Ni Foam

A promising electrode for hydrogen evolution reaction (HER) has been prepared via a reduction process to form NiF2 nanorod arrays directly grown on a 3D nickel foam.

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