Jiang, C;
Yang, J;
Han, X;
Qi, H;
Su, M;
Zhao, D;
Kang, L;
... Tang, J; + view all
(2021)
Crystallinity-Modulated Co_{2-x}V_{x}O_{4} Nanoplates for Efficient Electrochemical Water Oxidation.
ACS Catalysis
, 11
(24)
pp. 14884-14891.
10.1021/acscatal.1c04618.
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Abstract
Cost-efficient and durable oxygen evolution catalysts are in great demand, which are dominated not only by the component of the electrocatalysts but also by their molecular structure and crystallinity. Herein, we developed an efficient cobalt–vanadium spinel-type electrocatalyst with an extremely high concentration of Co^{3+} ions by tuning the balanced vanadium ions’ concentration in crystallinity-modulated Co_{2–x}V_{x}O_{4} nanoplates. This resulted in the lowest overpotential of 240 mV at 10 mA/cm^{2}, the smallest Tafel slope of 45 mV dec^{–1}, and a current density of 100 mA/cm^{2} at an overpotential of 280 mV for water oxidation, which is remarkably 20 times better than that of the benchmark RuO2 catalyst, along with excellent stability. Such excellent performance is due to the very high Co^{3+}/Co^{2+} ratio of 2.84 achieved in situ in the low-crystallinity Co_{2–x}V_{x}O_{4} (LC-Co_{2–x}V_{x}O_{4}) sample, which is 40% higher than that of the widely reported Co_{3}O_{4}, as evidenced by both operando X-ray absorption near-edge spectroscopy and in situ X-ray photoelectron spectroscopy. These findings stimulate the opportunities to explore Co_{2–x}V_{x}O_{4} as a class of nonprecious-metal-based efficient OER electrocatalysts.
| Type: | Article |
|---|---|
| Title: | Crystallinity-Modulated Co_{2-x}V_{x}O_{4} Nanoplates for Efficient Electrochemical Water Oxidation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acscatal.1c04618 |
| Publisher version: | https://doi.org/10.1021/acscatal.1c04618 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | electrocatalysts, water oxidation, cobalt−vanadium cluster, crystallinity, nanoplates |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10142932 |
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