NanoCOT: Low-Cost Nanostructured Electrode Containing Carbon, Oxygen, and Titanium for Efficient Oxygen Evolution Reaction

Journal of the American Chemical Society
Zhichao ShanShanlin Pan

Abstract

Developing high-efficiency, durable, and low-cost catalysts based on earth-abundant elements for the oxygen evolution reaction (OER) is essential for renewable energy conversion and energy storage devices. In this study, we report a highly active nanostructured electrode, NanoCOT, which contains carbon, oxygen, and titanium, for efficient OER in alkaline solution. The NanoCOT electrode is synthesized from carbon transformation of TiO2 in an atmosphere of methane, hydrogen, and nitrogen at a high temperature. The NanoCOT exhibits enhanced OER catalytic activity in alkaline solution, providing a current density of 1.33 mA/cm(2) at an overpotential of 0.42 V. This OER current density of a NanoCOT electrode is about 4 times higher than an oxidized Ir electrode and 15 times higher than a Pt electrode because of its nanostructured high surface area and favorable OER kinetics. The enhanced catalytic activity of NanoCOT is attributed to the presence of a continuous energy band of the titanium oxide electrode with predominantly reduced defect states of Ti (e.g., Ti(1+), Ti(2+), and Ti(3+)) formed by chemical reduction with hydrogen and carbon. The OER performance of NanoCOT can also be further enhanced by decreasing its overpotential by...Continue Reading

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Citations

Jan 14, 2017·Journal of the American Chemical Society·Qing KangDaniel R Strongin
Jun 27, 2018·Chemical Communications : Chem Comm·Xin QinXuping Sun
Dec 19, 2019·Chemical Communications : Chem Comm·Qiaoqiao ZhangJingqi Guan
Jan 28, 2021·The Journal of Chemical Physics·Minchan LiZhouguang Lu
Dec 15, 2018·ACS Applied Materials & Interfaces·Subhajit BhuniaSantanu Bhattacharya

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