Heterostructured Inter‐Doped Ruthenium–Cobalt Oxide Hollow Nanosheet Arrays for Highly Efficient Overall Water Splitting

Abstract

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)Ox] 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)Ox 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.

Fabrication of a porous NiFeP/Ni electrode for highly efficient hydrazine oxidation boosted H2 evolution

“…32 Strikingly, the synergism of the heteroatom is also conducive to further improving materials stability. 33 Therefore, we conclude that the transition metal phosphates optimized by heteroatom doping can improve the electrochemical reaction activity.…”

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

“…[1][2][3] In particular,t he electrochemical overall water splitting,representing one of the most eco-friendly and high-efficient techniques for hydrogen production, has been deemed to be an up-and-coming trend to realize such sustainable energy scheme. [3][4][5][6] Since the activities of electrocatalysts toward oxygen and hydrogen evolution reaction (OER and HER) determine the efficiency of electrocatalytic overall water splitting,t he rational design of high-performance electrocatalysts appears to be particularly significant. [7][8][9] In terms of activity and stability,e specially in the acidic environment, noble metals-based catalysts are still irreplaceable.…”

Tailored Catalytic Nanoframes from Metal–Organic Frameworks by Anisotropic Surface Modification and Etching for the Hydrogen Evolution Reaction

“…01‐1278). This phase transition of Co may originate from alloying with Pt and Ru, which again indicates that the introduced Pt and Ru were dissolved in the metallic Co to form alloys [36, 37] . Furthermore, the XRD results (Supporting Information, Figure S22c) of PdCo/C indicate the presence of Co 3 O 4 (JCPDS No.…”

“…This phase transition of Co may originate from alloying with Pt and Ru, which again indicates that the introduced Pt and Ru were dissolved in the metallic Co to form alloys. [36,37] Furthermore,t he XRD results (Supporting Information, Figure S22c Figure 4g,h and the Supporting Information, Figure S23) show peaks corresponding to Co,P t, C, and O. TheC o2p spectrum of PtCo/C (Figure 4g)c an be deconvoluted into eight individual peaks assigned to Co 0 ,C oO x and the corresponding satellites,respectively. [38,39] Thus,the Co 0 binding energies (including 2p 1/2 and 2p 3/2 )o ft he catalyst shift to…”