Rational Design of Highly Efficient Perovskite Hydroxide for Electrocatalytic Water Oxidation

Abstract

The production of hydrogen from ecofriendly renewable technologies like water electrolysis and fuel cells involves oxygen evolution reaction (OER), which plays a major role, but the slow kinetics of OER is a bottleneck of commercialization of such technologies. Herein, we have reported the formation of an efficient OER catalyst from SnCo(OH) 6 (SCH) by leaching of Sn atoms during electrochemical OER studies. According to density functional theory calculations, adsorption of OH* species on Sn atoms is energetically more favorable than that of Co atoms, and as a result, highly active CoOOH is generated by leaching of Sn atoms from surface layers. We observed enhanced OER performance with superior mass activity by blending SCH with activated charcoal, which displays a low overpotential of 293 mV and higher mass activity than that of pristine SCH. More importantly, it outperforms Co(OH) 2 and RuO 2 having the same carbon composition because of the formation of thermodynamically stable and amorphous CoOOH on the surface of single-crystalline SCH and strong tethering ability of activated charcoal.

Catalytic CoSn Perovskites for High-Performance Asymmetric Hybrid Supercapacitor and Efficient Oxygen Evolution Reaction: Experimental Investigation and DFT Validation

“…Binary metal oxides like Co–Ni, Mn–Co, Co–Fe, and Co–Sn-based hydroxide/oxides have been used in various applications like lithium-ion batteries, electrocatalysts, and supercapacitors. − Particularly, in the context of binary metal oxides for supercapacitors, Abbas et al synthesized the binder-free CoNi binary oxide electrode, which shows an electrochemical performance of 176 F/g at a current density of 1 A/g . Ishaq et al synthesized a binary composite of reduced graphene oxide and cobalt iron oxide (rGO/CoFe 2 O 4 ) and it exhibits a gravimetric capacitance of 97 F/g at 5 mV/s.…”

Cationic vacancies accelerate the generation of CoOOH in perovskite hydroxides for the electrooxidation of biomass

“…Prior to now, the application of perovskite hydroxide in electrocatalysis has been limited, and the lack of intrinsic active sites is regarded as one of the greatest obstacles limiting their applications. 15–20…”

“…Prior to now, the application of perovskite hydroxide in electrocatalysis has been limited, and the lack of intrinsic active sites is regarded as one of the greatest obstacles limiting their applications. [15][16][17][18][19][20] Creating vacancies has been demonstrated to be an effective strategy for regulating the electronic structure and surface/ interface microenvironment of electrocatalysts. This strategy has been extensively utilized for HMFOR.…”