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Type: Journal article
Title: Phosphorus vacancies boost electrocatalytic hydrogen evolution by two orders of magnitude
Author: Duan, J.
Chen, S.
Ortíz-Ledón, C.
Jaroniec, M.
Qiao, S.
Citation: Angewandte Chemie International Edition, 2020; 59(21):8258-8263
Publisher: Wiley Online Library
Issue Date: 2020
ISSN: 1433-7851
Statement of
Jingjing Duan, Sheng Chen, César A. Ortíz‐Ledón, Mietek Jaroniec, Shi‐Zhang Qiao
Abstract: Vacancy engineering is an effective strategy to manipulate the electronic structure of electrocatalysts to improve their performance; while few reports focus on phosphorus vacancies (Pv). Herein, we report the creation of Pv in metal phosphides and investigate their role in alkaline electrocatalytic hydrogen evolution reaction (HER). The Pv-modified catalyst requires a minimum onset potential of 0 mV vs RHE, a small overpotential of 27.7 mV to achieve 10 mA cm -2 geometric current density and a Tafel slope of 30.88 mV dec -1 , even outperforms Pt/C benchmark (32.7 mV@10 mA cm -2 and 30.90 mV dec -1 ). This catalyst also displays superior stability up to 504 hours without any decay. Experimental analysis and density functional theory calculations suggest Pv can weaken the hybridization of Ni 3d and P 2p orbitals, enriching the electron density of Ni and P atoms nearby Pv, facilitating H* desorption process, contributing to outstanding HER activity and facile kinetics.
Keywords: Vacancy engineering
density functional calculations
materials science
water splitting
Description: First published:22 January 2020
Rights: © 2020 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/anie.201914967
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Appears in Collections:Aurora harvest 4
Chemistry publications

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