CoTe₂–NiTe₂ heterojunction directly grown on CoNi alloy foam for efficient oxygen evolution reaction

Abstract

The development of high-efficiency and durable non-noble metal-based oxygen evolution reaction (OER) electrocatalysts is a particularly urgent need for electrochemical water splitting. An effective electrocatalyst can be prepared by tailoring...

Effect of nickel doping on the structure, morphology and oxygen evolution reaction performance of Cu-BTC derived CuCoO2

“…[2][3][4] Different from the HER featuring a two-electron transference, the OER is a coupling reaction with four electrons and protons requiring a higher overpotential, which involves multiple processes such as the multielectron transfer and the adsorption and desorption of intermediate substances, resulting in a slow reaction kinetics. 5,6 Therefore, the OER step is considered to be the bottleneck of water electrolysis for hydrogen/oxygen production, making researchers pay more attention to the exploration and development of OER electrocatalyst materials.…”

A CoNi telluride heterostructure supported on Ni foam as an efficient electrocatalyst for the oxygen evolution reaction

“…The fabrication route for the CoNi LDH@Te heterostructure is similar to that of our previous works 15,29,30 and is illustrated in Fig. 1.…”

“…The fabrication route for the CoNi LDH@Te heterostructure is similar to that of our previous works 15,29,30 and is illustrated in temperatures (160-200 °C), and the detailed information of these samples is given in Table 1. For a better comparison, bare Ni foam, Ni-Te-180C (without a Co additive), Co(OH) 2 @CoTe-180C (without Ni foam) and CoNi LDH-180C (without a Te source) were used as reference samples with the same hydrothermal reaction temperature of 180 °C.…”

“…Therefore, a lot of works demonstrated that metal telluride catalysts containing different metal species show an oxygen evolution reaction activity higher than that of those containing a single one, which was attributed to the synergistic effect of two or three metal species. 15,16 What's more, layered double hydroxides contain intercalated anions and polymetallic cations with a mixed valence and exhibit an analogous layered structure to brucite edge sharing metal-O 6 octahedra. Until now, many oxygen evolution reaction electrocatalysts based on LDH materials have been reported, due to their tunable composition and high electrocatalytic activity.…”

Nanocrystals of CuCoO2 derived from MOFs and their catalytic performance for the oxygen evolution reaction

“…38,39 In detail, the characteristic peaks located at binding energies of 779.4 and 794.5 eV are identified as Co 3+ species, 40,41 whereas the other two peaks at binding energies of 781.4 and 796.5 eV correspond to the Co 2+ species. 42,43 Besides, other weak satellite peaks of CCO1 and CCO2 at binding energies of 789.2 eV and 804.6 eV are caused by the unpaired electrons in the Co 2+ valence orbital. 44,45 Therefore, both CCO1 and CCO2 possess a pair of weak satellite peaks, suggesting that the cobalt species exist mainly in the state of Co 3+ species, which is consistent with the reports of Du et al 11,12,17 The O 1s XPS signals of CCO1 depicted in Fig.…”