Three-dimensional open nano-netcage electrocatalysts for efficient pH-universal overall water splitting.

Zhuang, Zewen; Wang, Yu; Xu, Cong-Qiao; Liu, Shoujie; Chen, Chen; Peng, Qing; Zhuang, Zhongbin; Xiao, Hai et al. · Nat Commun · 2019

basic_science · Level V

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Abstract

High-efficiency water electrolysis is the key to sustainable energy. Here we report a highly active and durable RuIrO<sub>x</sub> (x ≥ 0) nano-netcage catalyst formed during electrochemical testing by in-situ etching to remove amphoteric ZnO from RuIrZnO<sub>x</sub> hollow nanobox. The dispersing-etching-holing strategy endowed the porous nano-netcage with a high exposure of active sites as well as a three-dimensional accessibility for substrate molecules, thereby drastically boosting the electrochemical surface area (ECSA). The nano-netcage catalyst achieved not only ultralow overpotentials at 10 mA cm<sup>-2</sup> for hydrogen evolution reaction (HER; 12 mV, pH = 0; 13 mV, pH = 14), but also high-performance overall water electrolysis over a broad pH range (0 ~ 14), with a potential of mere 1.45 V (pH = 0) or 1.47 V (pH = 14) at 10 mA cm<sup>-2</sup>. With this universal applicability of our electrocatalyst, a variety of readily available electrolytes (even including waste water and sea water) could potentially be directly used for hydrogen production.