Assembling Ultrasmall Copper-Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Jianwei Su; Ruixiang Ge; Kemin Jiang; Yan Dong; Fei Hao; Ziqi Tian; Guoxin Chen; Liang Chen

doi:10.1002/adma.201801351

Assembling Ultrasmall Copper-Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Adv Mater. 2018 Jun 5:e1801351. doi: 10.1002/adma.201801351. Online ahead of print.

Authors

Jianwei Su¹, Ruixiang Ge¹, Kemin Jiang¹, Yan Dong¹, Fei Hao¹, Ziqi Tian¹, Guoxin Chen¹, Liang Chen¹

Affiliation

¹ Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, P. R. China.

PMID: 29870585
DOI: 10.1002/adma.201801351

Abstract

Here, a facile and novel strategy for the preparation of Cu-doped RuO₂ hollow porous polyhedra composed of ultrasmall nanocrystals through one-step annealing of a Ru-exchanged Cu-BTC derivative is reported. Owing to the optimized surface configuration and altered electronic structure, the prepared catalyst displays a remarkable oxygen evolution reaction (OER) performance with low overpotential of 188 mV at 10 mA cm^-2 in acidic electrolyte, an ultralow Tafel slope of 43.96 mV dec^-1 , and excellent stability in durability testing for 10 000 cycles, and continuous testing of 8 h at a current density of 10 mA cm^-2 . Density functional theory calculations reveal that the highly unsaturated Ru sites on the high-index facets can be oxidized gradually and reduce the energy barrier of rate-determining steps. On the other hand, the Cu dopants can alter the electronic structures so as to further improve the intrinsic OER activity.

Keywords: Cu doping; MOFs derivatives; OER in acidic media; RuO2; facet effect.