Nickel nitrate solution

Catalog Number	ACEP13138459
CAS Number	13138-45-9
Molecular Formula	Ni(NO3)2

Case Study

Ni(NO₃)₂-Induced Performance Enhancement of WC-Based Electrocatalysts for Hydrogen Evolution Reaction

Zhang, Lei, et al. Electrochimica Acta 422 (2022): 140553.

The use of Ni(NO₃)₂ to enhance the electrocatalytic performance of tungsten carbide (WC)-based self-supported catalysts for hydrogen evolution reaction (HER) has been investigated. In this study, WC particles were doped with varying concentrations of Ni(NO₃)₂ and synthesized on carbon fiber paper (CFP) via a molten salt method. The incorporation of nickel nitrate facilitated the formation of fold-like structures, which exposed more active sites and improved the catalyst's efficiency.
The electrocatalytic performance demonstrated a trend where the HER activity increased with Ni(NO₃)₂ concentration up to 4 M, achieving an optimal performance with a low overpotential of 73 mV at 10 mA cm^-2 and a small Tafel slope of 66.4 mV dec^-1. However, higher concentrations of Ni(NO₃)₂ (≥5 M) hindered the HER performance, likely due to altered bonding interactions between the catalyst and hydrogen.
Density functional theory (DFT) calculations confirmed that Ni doping reduced hydrogen adsorption energy and improved conductivity, enhancing charge transfer. However, excessive Ni doping resulted in higher W-H binding energy, negatively impacting performance.
This research presents Ni(NO₃)₂ as an effective dopant for improving the electrocatalytic properties of WC-based catalysts, offering a low-cost and efficient alternative for hydrogen production through enhanced active site exposure and optimized catalytic behavior.

Nickel Nitrate Solution as a Catalyst for Enhancing Solid Oxide Fuel Cell Performance via Infiltration Method

Yildirim, Fuat, Cigdem Timurkutluk, and Bora Timurkutluk. Ceramics International 49.14 (2023): 23642-23653.

In this study, Nickel nitrate solution (Ni(NO₃)₂) was utilized as a precursor for infiltrating porous YSZ (yttria-stabilized zirconia) anode electrodes in the development of nanostructured anodes for solid oxide fuel cells (SOFCs).
Cells were infiltrated with varying concentrations of Nickel nitrate solution (0.5 M, 1 M, and 2 M) and sintered at 800 °C. The optimal performance was achieved with the 2 M solution, infiltrated 9 times, resulting in a peak power density of 0.398 W/cm² at 800 °C, more than double the power output of the conventional Ni-YSZ anode (0.174 W/cm²). The infiltration method provided a significant increase in cell performance by creating a nanostructured nickel catalyst that improved the electrochemical active sites, which was not achievable with conventional screen printing methods.
Furthermore, the study revealed that increasing the infiltration sintering temperature beyond 800 °C led to detrimental grain growth in the Ni phase, reducing the number of triple-phase boundaries (TPBs) and negatively impacting performance. The optimized nanostructured anode showed excellent stability, providing 0.169 W/cm² at 700 °C, demonstrating the potential of Nickel nitrate solution for reducing operational temperatures without compromising performance.
This method offers a promising approach for improving SOFC efficiency using affordable and efficient materials.

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