Interfacial engineering and chemical reconstruction of Mo/Mo₂C@CoO@NC heterostructure for promoting oxygen evolution reaction

Abstract

Chemical reorganization and interfacial engineering in hybrid nanomaterials are promising strategies for enhancing electrocatalytic performance. Herein, MoO3@zeolitic imidazolate framework-67 (ZIF-67) heterogeneous nanoribbons are designed through the coordination assembly. Following the...

Interface Catalysts of Ni3Fe1 Layered Double Hydroxide and Titanium Carbide for High-Performance Water Oxidation in Alkaline and Natural Conditions

“…More importantly, our Ni 3 Fe 1 -LDH/Ti 3 C 2 T x catalysts readily drive water oxidation at high current densities of 500 and 1000 mA cm –2 at very low potentials of 1.57 and 1.62 V, respectively, as shown in Figures e and S6. The excellent OER performance makes our Ni 3 Fe 1 -LDH/Ti 3 C 2 T x comparable to most nonprecious OER electrocatalysts reported in the literature, including Co–Fe–P, Co 0.13 Ni 0.87 Se 2 /Ti, Co@CoTe 2 , NiPS 3 -G, B–Ni@NF, S:Co 2 P@NF, Ni 3 B@rGO, NiTe NR/NF, Co 2 P, NiFeP x -NC, Mo/Mo 2 C@CoO@NC, and Ti 3 C 2 -Co-TiO 2 , as shown in Figure f and Table S2. Overall, these above results unambiguously confirm that our Ni 3 Fe 1 -LDH/Ti 3 C 2 T x demonstrates outstanding performance over the full range of current densities and possesses robust industrially relevant stability for water oxidation applications.…”

“…Figure 3e shows that Ni 3 Fe 1 -LDH/Ti 3 C 2 T x can stably produce a current density of 100 mA cm −2 with no apparent degradation observed after 100 h. The generated amount of O 2 well matched the theoretically calculated quantity, where all the passed charge was used to catalyze O 2 generation with a Faradaic efficiency close to 100% (Figure S5). More importantly, our Ni 3 Fe 1 -LDH/Ti 3 C 2 T x catalysts readily drive water oxidation at high current densities of 500 and 1000 mA cm −2 at very low potentials of 1.57 and 1.62 V, respectively, as shown in Figures 3e and S6 Co−Fe−P, 58 Co 0.13 Ni 0.87 Se 2 /Ti, 59 Co@CoTe 2 , 60 NiPS 3 -G, 61 B−Ni@NF, 47 S:Co 2 P@NF, 62 Ni 3 B@rGO, 63 NiTe NR/NF, 64 Co 2 P, 65 NiFeP x -NC, 66 Mo/Mo 2 C@CoO@NC, 67 and Ti 3 C 2 -Co-TiO 2 , 68 as shown in Figure 3f and Table S2. Overall, these above results unambiguously confirm that our Ni 3 Fe 1 -LDH/ Ti 3 C 2 T x demonstrates outstanding performance over the full range of current densities and possesses robust industrially relevant stability for water oxidation applications.…”

A low-content CeOx dually promoted Ni3Fe@CNT electrocatalyst for overall water splitting

“…23 Obviously, the formation of the Ni 3 Fe phase is caused by the carbothermal reduction during the pyrolysis process. 3,24 In addition, a low hump is clearly observed at 25.4°, which is well related to the carbon component that was derived from the calcined melamine. 25 Note that no characteristic XRD peaks of CeO x were visible, which is attributed to the low content beyond the detection limit of the XRD instrument.…”

“…Exploration of green renewable hydrogen energy has been triggered due to the increasing energy crisis and environmental pollution that are caused by the combustion of traditional fossil fuels. Among those clean and efficient energy-conversion technologies, [1][2][3][4][5] electrocatalytic water splitting has attracted wide attention owing to its potential for convenient large-scale application and sustainability. 6 Generally, electrocatalytic water splitting occurs in two core half-reactions: the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), both of which have sluggish reaction kinetics and are highly dependent on high-performance but precious electrocatalysts with lower overpotentials and accomplish favorable energy-transfer efficiency for activation.…”

A quaternary heterojunction nanoflower for significantly enhanced electrochemical water splitting

“…The excellent bifunctional OER and HER activities and stabilities of the as-prepared Q-NiFe130 nanoflower structure can be ascribed to the following factors: (i) the strong electronic interaction between T-Ni and NiFe-LDH enhances the electrocatalytic efficiency, (ii) the nanoflower structure provides abundant accessible active sites and forms close contact with electrolytes, which is beneficial for ion diffusion and gas release, and (iii) the direct growth on Ni foam not only guarantees good electrical conductivity, thus favoring fast electron transport, but also enables good mechanical adhesion, therefore leading to excellent electrocatalytic activities and stabilities. 50,51…”