Electrochemically induced NiOOH/Ag+ active species for efficient oxidation of 5-hydroxymethylfurfural

Electrochemical conversion of 5-hydroxymethylfurfural over CuNi bimetallic catalysts: the synergistic effect of interfacial active sites

“…38 The high O II content in Ni(OH) 2 -NCF confirms the presence of Ni-OH and a large number of oxygen vacancies, which could adsorb OH − to facilitate the pre-activation of the electrocatalyst. 26 The high content of oxygen vacancies in Ni(OH) 2 -NCF compared to Ni(OH) 2 -NF and Ni(OH) 2 -CF may be attributed to the special interfacial interactions between the surface deposition layer and the substrate. In addition, the O I component in Ni(OH) 2 -NCF shows a relatively lower binding energy position with respect to Ni(OH) 2 -CF and Ni(OH) 2 -NF, probably due to the existence of the Ni–O–Cu linkage in the catalyst.…”

“…38 The high O II content in Ni(OH) 2 -NCF confirms the presence of Ni-OH and a large number of oxygen vacancies, which could adsorb OH − to facilitate the pre-activation of the electrocatalyst. 26 The high content of oxygen vacancies in Ni(OH S5 †). An EPR result also confirms the relatively higher oxygen vacancies (the signal at g = 2.001) in Ni(OH) 2 -NCF than in Ni(OH) 2 -CF and Ni(OH) 2 -NF (Fig.…”

“…24 Among those, NiOOH generated by Ni-based catalysts has attracted much attention in most studies. [25][26][27] As for improving the generation of NiOOH, doping a second transition element is verified to be effective in the modulation of the Ni electronic structure 28 and generation of high-valent Ni species, 29 consequently promoting the reaction kinetics 30 and decreasing the oxidation potential. In addition, generating accessible active sites 31 for favorable adsorption, rapid electron transfer, 32 and rapid oxidation of HMF rather than dimerization should also be considered in the preparation of electrocatalysts.…”

Recent Advances in Electrocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid by Heterogeneous Catalysts

“…Recently, Fan and co-workers induced the interface activation of Ni-MOF/Ag through in situ electrochemical reconstruction strategy [113]. The activated CF-Ni-MOF/Ag (CF, Cu foam) showed good electrocatalytic performance for HMFOR.…”

F-doped NiOOH derived from progressive reconstruction for efficient and durable water oxidation

“…Actually, both experimental results and theoretical calculations have revealed that some pre-catalysts may experience severe structural collapse during the drastic reconstruction, resulting in unsatisfactory OER stability, which is attributed to the volumetric expansion effect and/or crystal structure mismatch between pre-catalysts and reconstructed products. [27][28][29] In this context, it is meaningful to develop a strategy to appropriately mitigate the structural damage caused by the radical and rapid structural transformation under OER conditions.…”