Electrodeposited Ni-W-Zn Alloys as Promising Electrocatalysts for Hydrogen Production by Micro-Anode Guided Electroplating

Jing Chie Lin, Yao Tien Tseng, Chin Huang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The aim of this study is to identify effective, durable, and affordable electrocatalysts that can replace Pt-group metals during the hydrogen evolution reaction (HER) in alkaline water electrolysis. To achieve this, a range of Ni-W-Zn alloys were prepared using the micro-anode guided electroplating (MAGE) process. The bath ratio of [Ni2+] / [WO42-] / [Zn2+] was systematically varied during the experiment. To characterize the micropillars, three-dimensional micropillars composed of Ni-based material were fabricated and analyzed using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The results showed that the micropillars had a smooth morphology and were composed of an amorphous phase with a composition range of 54-61 at. % Wand 3-9 at. % Zn. The electrocatalytic activity of the micropillars was assessed in a solution of 1.0 M KOH using various electrochemical techniques, such as Tafel polarization, linear scanning voltammetry (LSV), and cyclic voltammetry (CV). The micropillars' morphology and composition were found to have a significant impact on their catalytic efficacy. The Ni50W41Zn9 composition yielded the most effective catalytic performance, as reflected by the highest exchange current density of 2 mA/cm2, the lowest Tafel slope of 73 mV/dec, and the maximum current density of 742.61 ma/ at the 650th cycle as determined by CV. The superior catalytic reactivity of the 3D Ni-W-Zn alloy compared to the unmodified Ni electrode can be attributed to two factors: the activation of the hydrogen adsorption-desorption process (facilitated by the presence of W on the Ni-W surface), and the enlargement of the surface area resulting from the formation of pores due to dezincification in the alkaline environment.

Original languageEnglish
Title of host publication2023 IEEE 23rd International Conference on Nanotechnology, NANO 2023
PublisherIEEE Computer Society
Number of pages4
ISBN (Electronic)9798350333466
StatePublished - 2023
Event23rd IEEE International Conference on Nanotechnology, NANO 2023 - Jeju City, Korea, Republic of
Duration: 2 Jul 20235 Jul 2023

Publication series

NameProceedings of the IEEE Conference on Nanotechnology
ISSN (Print)1944-9399
ISSN (Electronic)1944-9380


Conference23rd IEEE International Conference on Nanotechnology, NANO 2023
Country/TerritoryKorea, Republic of
CityJeju City


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