Boron doped Fe3S4/Co3S4 decorated with multi-wall carbon nanotubes as an efficient electrocatalyst for oxygen evolution reaction in alkaline media

Designing an exceedingly active and universal electrocatalyst for oxygen evolution reaction is utterly essential for commercial development. Herein, boron-doped cobalt-iron bimetallic sulfide synthesized through an easy single-step hydrothermal route is reported as electrocatalyst. The B-Fe3S4/Co3S4 was further decorated with the multi-wall carbon nano-tubes (MWCNT). The morphology of B-Fe3S4/Co3S4 was sphere like and it was converted to marigold flower-like after decorating it with MWCNT. The catalytic efficiency of Fe3S4/Co3S4 increased by doping with Boron and further increased by decorating with MWCNT. The prepared catalyst B-Fe3S4/Co3S4/ MWCNT was tested for oxygen evolution reaction (OER) in alkaline solution and offered 319 mV as overpotential and 60 mV/decas Tafel slope value. In addition to it, the catalyst shows good stability, large Brunauer-EmmettTeller (BET) surface area (30.24 m2/g), and low value of charge transfer resistance (6.5 Omega), indicating that it is efficient catalyst and its high efficiency is associated with its morphology and ternary composite structure. The investigated low cost catalyst is as good as the commercially used high cost noble metal RuO2 catalysts.