Hollow Porous MnFe₂O₄ Sphere Grown on Elm‐Money‐Derived Biochar towards Energy‐Saving Full Water Electrolysis

Abstract

The development of inexpensive and efficient bifunctional electrocatalysts is significant for widespreadp ractical applications of overall water splittingt echnology. Herein,aone-pot solvothermal method is used to prepare hollow porousM nFe 2 O 4 spheres, which are grown on natural-abundant elm-money-derived biocharm aterial to construct MnFe 2 O 4 /BC composite. When the overpotential is 156 mV for both the oxygen evolution reaction and the hydrogen evolution reaction, the current density reaches up to 10 mA cm À2 ,a nd its duration is 10 h. At 1.51 V, the overall waterd ecomposition currentd ensity of 10 mA cm À2 can be obtained in 1 m KOH. This work proves that elm-money-derived biochar is av alid substrate for growingh ollow porous spheres.M nFe 2 O 4 /BC give ap romising general strategy for preparing the effective and stable bifunctional catalysis that can be expand to multiple transition metal oxide.

Recent Progress on Bimetallic‐Based Spinels as Electrocatalysts for the Oxygen Evolution Reaction

“…[107] The intercalation method afforded the ultrathin NiCo 2 O 4 NS structure with a high specific surface area, which provided sufficient anchoring sites for the dispersion of MnFe In a way to improve the stability of hollow porous MnFe 2 O 4 spheres, Liu and co-workers synthesized MnFe 2 O 4 hollow porous spheres and elm-money-derived biochar composites (MnFe 2 O 4 /BC) using a one-pot solvothermal method (Figure 25). [103] The resulting MnFe 2 O 4 /BC exhibited an overpotential of 156 mV at 10 mA cm −2 in alkaline environment, which was slightly higher than that of MnFe 2 O 4 hollow porous spheres (133 mV). The Tafel slopes were found to be 23 and 24 mV dec −1 for MnFe 2 O 4 /BC and MnFe 2 O 4 , respectively.…”

“…Some of the reported materials are NiCo 2 O 4 , [107] FeNi 3 , [108] graphene, [108] and biochar. [103] Recently, Zhang and co-workers reported the use of the non-hydrolytic thermal decomposition method for the in situ growth of ultrafine MnFe 2 O 4 nanocrystals on ultrathin NiCo 2 O 4 nanosheets (NS), which was synthesized by an intercalation method, followed by subsequent thermal treatment. [107] The intercalation method afforded the ultrathin NiCo 2 O 4 NS structure with a high specific surface area, which provided sufficient anchoring sites for the dispersion of MnFe In a way to improve the stability of hollow porous MnFe 2 O 4 spheres, Liu and co-workers synthesized MnFe 2 O 4 hollow porous spheres and elm-money-derived biochar composites (MnFe 2 O 4 /BC) using a one-pot solvothermal method (Figure 25).…”

“…[109] Recently, the use of heteroatoms, such as N and S, as doped carbon supports have been reported to further enhance OER performance due to their high affinity for MnFe Reproduced with permission. [103] Copyright 2020, Wiley-VCH.…”

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

“…Nevertheless, the electrocatalyst was successfully applied in water splitting and a good hydrogen production efficiency was achieved. [212]. The biochar was obtained from the calcination of elm moneys at 600 • C for 2 h under N 2 atmosphere.…”

Tungsten-Based Nanocatalysts: Research Progress and Future Prospects

“…In addition, biochar has a strong cross-linking effect with metal nanoparticles before the reaction and high defect sites in the reaction [ 45 ]. Therefore, biochar has recently been widely studied by researchers [ 46 , 47 , 48 ]. Mesoporous is another kind of support, it possesses the characteristics of high specific surface area, regular and orderly pore structure, narrow pore size distribution and continuous adjustable pore size, which give it a role in catalytic reactions.…”