High-performance hydrogen evolution by Ru single atoms and nitrided-Ru nanoparticles implanted on N-doped graphitic sheet

Tiwari, Jitendra N., Harzandi, Ahmad M., Ha, Miran, Sultan, Siraj, Myung, Chang Woo, Park, Hyo Ju, Kim, Dong Yeon, Thangavel, Pandiarajan, Singh, Aditya Narayan, Sharma, Pankaj ORCID: https://orcid.org/0000-0003-2319-260X, Chandrasekaran, Selvaraj Selva, Salehnia, Foad, Jang, Ji-Wook, Shin, Hyeon Suk, Lee, Zonghoon and Kim, Kwang S. 2019. High-performance hydrogen evolution by Ru single atoms and nitrided-Ru nanoparticles implanted on N-doped graphitic sheet. Advanced Energy Materials 9 (26) , 1900931. 10.1002/aenm.201900931

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Abstract

The most efficient electrocatalyst for the hydrogen evolution reaction (HER) is a Pt-based catalyst, but its high cost and nonperfect efficiency hinder wide-ranging industrial/technological applications. Here, an electrocatalyst of both ruthenium (Ru) single atoms (SAs) and N-doped-graphitic(GN)-shell-covered nitrided-Ru nanoparticles (NPs) (having a Ru-Nx shell) embedded on melamine-derived GN matrix {1: [Ru(SA)+Ru(NP)@RuNx@GN]/GN}, which exhibits superior HER activity in both acidic and basic media, is presented. In 0.5 m H2SO4/1 m KOH solutions, 1 shows diminutive “negative overpotentials” (−η = |η| = 10/7 mV at 10 mA cm−2, lowest ever) and high exchange current densities (4.70/1.96 mA cm−2). The remarkable HER performance is attributed to the near-zero free energies for hydrogen adsorption/desorption on Ru(SAs) and the increased conductivity of melamine-derived GN sheets by the presence of nitrided-Ru(NPs). The nitridation process forming nitrided-Ru(NPs), which are imperfectly covered by a GN shell, allows superb long-term operation durability. The catalyst splits water into molecular oxygen and hydrogen at 1.50/1.40 V (in 0.1 m HClO4/1 m KOH), demonstrating its potential as a ready-to-use, highly effective energy device for industrial applications.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Wiley-VCH Verlag
ISSN:	1614-6832
Last Modified:	15 Nov 2022 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/153553

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