Boosting the electrochemical performance of mesoporous NiCo 2 O 4 oxygen evolution catalysts by facile surface modifying
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Boosting the electrochemical performance of mesoporous NiCo2O4 oxygen evolution catalysts by facile surface modifying X. He1 · Y. D. Huang1 · X. T. Sun1 · P. Du1 · Z. B. Zhao1 · R. Y. Wang1 · H. Yang1 · Y. Wang1 · K. Huang1 Received: 14 August 2020 / Accepted: 22 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To effectively develop enhanced oxygen evolution reaction (OER) catalysts, we propose a surface anion and cation comodification strategy toward mesoporous N iCo2O4. After a simple ethanol-assisted grinding and subsequent annealing process, the modified NiCo2O4 catalysts (NiCo2O4-FeF3-A) exhibit a superior OER catalytic activity and stability compared with other controlled samples. The overpotential value to drive the standard OER current density of 10 mA cm−2 in 1 M KOH electrolyte is only 260 mV, significantly decreasing by as large as 110 mV relative to the pristine NiCo2O4. In addition, negligible degeneration is observed during accelerated durability tests (ADTs) for 5000 cycles, confirming the strong interaction between oxide substrates and modified ions. The enhancement of electro-catalytic activity can be attributed to the effective and accelerated charge-transfer process induced by surface electronic state reconstruction. Keywords Oxygen evolution reaction · Electrocatalysis · Co-modification · Electron reconstruction · Mesoporous metal oxide
1 Introduction The electrochemical water splitting (EWS) process has attracted extensive attentions in recent decades, due to the enormous potential to large-scale store intermittent renewable and clean energy (such as solar and wind energy) in the form of hydrogen gas [1], which involves the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at the cathode and anode, respectively. In general, the real efficiency of EWS device is hindered by the kinetically sluggish OER with larger overpotential than HER [2]. To accelerate the oxygen electrochemical evolution, noble metal iridium (Ir)- and ruthenium (Ru)-based oxides have been regarded as the most advanced OER electrocatalysts, but Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-04017-z) contains supplementary material, which is available to authorized users. * R. Y. Wang [email protected] * K. Huang huang‑[email protected] 1
State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
their large-scale applications are still limited by the scarcity, high cost and poor stability [3]. Therefore, the development of low-cost, efficient and stable OER catalyst is the key but challenging to improve the performance of EWS technology. Owing to the high abundance, low cost and relatively high activity, transition metal oxides have been widely developed as the promising candidates for high-efficient OER electrochemisty. For example, related studies have demonstrated that NiCo2O4 spin
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