Poorly crystallized nickel hydroxide carbonate loading with Fe3+ ions as improved electrocatalysts for oxygen evolution

MOF-Derived Fe-Doped Ni@NC Hierarchical Hollow Microspheres as an Efficient Electrocatalyst for Alkaline Oxygen Evolution Reaction

“…All the MOF-derived Ni-based catalysts show good OER catalytic performances, in which the hierarchical hollow microstructure should contribute much in affording numerous active sites and achieving fast mass transfer. , More importantly, the Fe-doped Ni@NC samples exhibit even lower overpotentials and smaller Tafel slopes than the pure Ni@NC sample (Figure a,b), indicating that the Fe dopant further enhances the electrocatalytic activity of Ni@NC. Fe doping can efficiently modulate the electronic structure of materials, thus improving the intrinsic catalytic activity of Ni-based catalysts. , We should emphasize that Fe(5%)-Ni@NC exhibits the smallest overpotential of 257 mV at 10 mA cm –2 among the prepared Ni@NC catalysts, even outperforming the RuO 2 catalyst at high current density. The Tafel slope of Fe(5%)-Ni@NC is identified to be 54.6 mV dec –1 , which is smaller than that of other Ni@NC catalysts (Figure b).…”

“…Fe doping can efficiently modulate the electronic structure of materials, thus improving the intrinsic catalytic activity of Ni-based catalysts. 12,13 We should emphasize that Fe(5%)-Ni@NC exhibits the smallest overpotential of 257 mV at 10 mA cm −2 among the prepared Ni@NC catalysts, even outperforming the RuO 2 catalyst at high current density. The Tafel slope of Fe(5%)-Ni@NC is identified to be 54.6 mV dec −1 , which is smaller than that of other Ni@NC catalysts (Figure 3b).…”

“…For example, recent studies have proved that Fe doping into Ni-based catalysts can efficiently adjust the electronic structure, improve the electrical conductivity, and expose more surface area. 12 , 13 Taken together, Fe-doped Ni-based catalysts are reasonably expected to provide more favorable OER performance. However, the preparation of Fe-doped Ni-based OER electrocatalysts is quite challenging, and a facile synthetic strategy is highly desired.…”

“…Presently, transition metals (such as Ni, Co, Fe, and Mn) are proverbially recognized as potential alternatives for their reasonable cost and natural abundance. − Among these systems, Ni-based catalysts have broadly attracted attention and shown promising activities. , Reasonable composition control and structure design can further enhance the OER performance of Ni-based catalysts. For example, recent studies have proved that Fe doping into Ni-based catalysts can efficiently adjust the electronic structure, improve the electrical conductivity, and expose more surface area. , Taken together, Fe-doped Ni-based catalysts are reasonably expected to provide more favorable OER performance. However, the preparation of Fe-doped Ni-based OER electrocatalysts is quite challenging, and a facile synthetic strategy is highly desired.…”

Mixed Transition Metal Carbonate Hydroxide‐Based Nanostructured Electrocatalysts for Alkaline Oxygen Evolution: Status and Perspectives

“…Figure displays a pie chart of the available reports on the electrocatalytic alkaline OER activities of transition metal carbonate hydroxides to date. [ 55–57,59,60,67–99 ] The present review commences with a general discussion of the electrochemical pathways and mechanism of OER in alkaline media. Subsequently, all the activity‐determining parameters in the OER and comprehensive studies on first‐row transition‐metal‐based multimetallic MTMCHs as OER electrocatalysts are discussed.…”