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Heterostructured Inter‐Doped Ruthenium–Cobalt Oxide Hollow Nanosheet Arrays for Highly Efficient Overall Water Splitting
Author(s) -
Wang Cheng,
Qi Limin
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202005436
Subject(s) - overpotential , nanosheet , water splitting , tafel equation , bifunctional , oxygen evolution , ruthenium , cobalt , ruthenium oxide , catalysis , materials science , oxide , cobalt oxide , chemical engineering , transition metal , inorganic chemistry , nanotechnology , chemistry , electrochemistry , electrode , metallurgy , organic chemistry , photocatalysis , engineering
The development of transition‐metal‐oxides (TMOs)‐based bifunctional catalysts toward efficient overall water splitting through delicate control of composition and structure is a challenging task. Herein, the rational design and controllable fabrication of unique heterostructured inter‐doped ruthenium–cobalt oxide [(Ru–Co)O x ] hollow nanosheet arrays on carbon cloth is reported. Benefiting from the desirable compositional and structural advantages of more exposed active sites, optimized electronic structure, and interfacial synergy effect, the (Ru–Co)O x nanoarrays exhibited outstanding performance as a bifunctional catalyst. Particularly, the catalyst showed a remarkable hydrogen evolution reaction (HER) activity with an overpotential of 44.1 mV at 10 mA cm −2 and a small Tafel slope of 23.5 mV dec −1 , as well as an excellent oxygen evolution reaction (OER) activity with an overpotential of 171.2 mV at 10 mA cm −2 . As a result, a very low cell voltage of 1.488 V was needed at 10 mA cm −2 for alkaline overall water splitting.