Strongly Coupled CoCr ₂ O ₄ /Carbon Nanosheets as High Performance Electrocatalysts for Oxygen Evolution Reaction

Abstract

A strongly coupled CoCr2 O4 /carbon nanosheet composite is concurrently grown via a facile one-step molten-salt calcination approach. The strong coupling between carbon and CoCr2 O4 has improved the electrical conductivity and preserved the active sites in catalysts. These results may pave the way to improve the performance of spinel oxides as electrocatalysts for oxygen evolution reactions.

Interface Electronic Coupling in Hierarchical FeLDH(FeCo)/Co(OH)2 Arrays for Efficient Electrocatalytic Oxygen Evolution

“…Figure c shows the O 1s XP spectra. Four peaks for O1 (532.7 eV), O2 (531.7 eV), O3 (531.0 eV), and O4 (530.1 eV) species are assigned to adsorbed water, FeOH, CoOH, and MO (M=Fe, Co) species the of FeLDH and Co(OH) 2 , respectively . The surface contents of Co, Fe, and O elements obtained from the XP survey spectrum (Figure S7) are listed in Table S1.…”

“…[49] Figure 3c shows the O1sX Ps pectra.F our peaks for O1 (532.7 eV), O2 (531.7 eV), O3 (531.0 eV), and O4 (530.1 eV) speciesa re assigned to adsorbed water,F eOH, CoOH, and MO (M = Fe, Co) speciest he of FeLDH and Co(OH) 2 , respectively. [46,47,50,51] The surfacec ontents of Co, Fe, and Oe lements obtained from the XP survey spectrum ( Figure S7) are listed in Ta ble S1. The Fe contents in FeLDH(FeCo)/Co(OH) 2 -2 and -3 are clearly higher than the Co contents, which indicates that the amorphous phase in FeLDH(FeCo) nanosheets is mainly Fe(OH) x .I ti sc ommonly believed that Co in Co-Febased catalysts is the active center for the OER.…”

Reverse Microemulsion‐Assisted Synthesis of NiCo2S4 Nanoflakes Supported on Nickel Foam for Electrochemical Overall Water Splitting

“…Electrolysis of water is widely accepted as one of the most attractive approaches to produce hydrogen, including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with large overpotential . Nowadays, IrO 2 has been used as the state‐of‐the‐art OER catalyst and platinum (Pt) are conventionally considered as benchmark electrocatalysts for HER .…”

Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes: Mechanisms, Challenges, and Prospective Solutions

“…Possibly the P atoms may also act as proton carrier to further accelerate the kinetics of protons (H + ) adsorption and recombination and can dramatically lower the overpotential for HER 110. Further distribution of positively and negatively charge density due to the existence of heteroatoms may make it active toward hydrogen generation 91, 111. Taking advantage of heteroatom doping on conductivity and enhancing the intrinsic activity of CoP, Zou and co‐workers have developed N–P co‐doped carbon matrix for CoP to eliminate the inactive carbon addition to catalyst ink and improve the activity 112.…”