Heteroatom-Doped Amorphous Cobalt-Molybdenum Oxides as aPromising Catalyst for Robust Hydrogen Evolution

The simultaneous manipulation of the catalyticactivity and intrinsic electrical conductivity in a unified system isdifficult yet meaningful to unravel the possible strategy that canenhance the hydrogen evolution reaction (HER) performance.Therefore, we propose a simple strategy to enhance the HERperformance based on low-temperature redox reaction with ZIF-67@ZIF-8 as a sacrificial template to prepare zinc-dopedamorphous CoMo8Ox(denoted as Zn/aCMO). Benefiting fromthe excellent compositional- and amorphous-based structuraladvantages of more exposure active sites, optimized electrontransfer as well as a stable frame structure, the as-prepared electrodecan drive hydrogen evolution at current densities of 10, 50, and 100mA cm-2, which need ultralow overpotentials of 59, 138, and 189 mV, respectively, and the Tafel slope of the electrode was 66.2 mVdec-1(1 M KOH). Meanwhile, the intrinsic activity of the prepared low-cost electrocatalyst was also determined, and the turnoverfrequency was up to 1.49 s-1at an overpotential of 100 mV. In addition, after continuous testing for 160 h, there was a slight decay atthe overpotential of 130 mV