Metallic S‐CoTe with Surface Reconstruction Activated by Electrochemical Oxidation for Oxygen Evolution Catalysis

Abstract

Developing highly active electrocatalysts toward oxygen evolution reaction (OER) is critical for the application of water splitting for hydrogen production and can further alleviate the energy crisis problem, but still remaining challenging. Especially, unlocking the catalytic site, in turn, helps design the available catalysts. Herein, the nanorod cobalt telluride with sulfur incorporation grown on a carbon cloth (S‐CoTe/CC) as catalysts for OER, which displays extraordinary catalytic activity, is reported. Significantly, the in situ formed CoOOH species on the surface of S‐CoTe merited from the structure evolution during the OER process serves as the active species. Furthermore, density functional theory calculations demonstrate that sulfur incorporation can tailor the electronic structure of active species and substantially optimize the free energy, accelerating the OER kinetics. This work provides an in‐depth understanding of enhanced OER mechanism through foreign elements incorporating into precatalysts and is beneficial for the guiding design of more efficient catalysts.

Electronic modulation of cobalt–molybdenum oxideviaTe doping embedded in a carbon matrix for superior overall water splitting

“…Therefore, Te-doping can lead to the strong electronic interaction between Co and Mo to tune the electronic structure of the metal sites, which positively affects the enhancement of the intrinsic activity of the Te-CoMoO 3 @C electrode. 60 In the O 1s spectrum, Te-CoMoO 3 @C exhibits three characteristic peaks at 532.84, 531.13, and 530.42 eV, which are attributed to adsorbed water (O ads ), oxygen vacancies (O v ), and metaloxygen bonds (M-O), respectively (Fig. 2i and Table S2 †).…”

Co‐MnO2 Nanorods for High‐Performance Sodium/Potassium‐Ion Batteries and Highly Conductive Gel‐Type Supercapacitors

“…[ 8 ] The high‐resolution spectrum of Co 2p in Figure 1e exhibits two characteristic peaks of 801.6 and 780.7 eV, corresponding to the binding energies of Co 2p 1/2 and Co 2p 3/2 . [ 9 ] In the Figure 1f of O 1s spectrum, the peaks of 533.6, 531.4, and 529.5 eV are parallel to hydrous metallic oxides (Mn/Co─O─H), residual water molecule (H—O—H), and metallic oxides (Mn/Co—O—Mn/Co), respectively. [ 10 ] These facts confirm that the element of Co is successfully doped into the crystal lattice of MnO 2 .…”

PEM water electrolysis for hydrogen production: fundamentals, advances, and prospects

“…Electrochemical water splitting is an effective and clean method to produce high-purity hydrogen by using renewable energy, which has ignited new interests in the past decades. During the water electrolysis process, hydrogen evolution reaction (HER) occurs at the cathode and oxygen evolution reaction (OER) operates at the anode [6][7][8]. Theoretically, it only needs the voltage of 1.23 V to drive the water electrolysers to obtain hydrogen production.…”