Hierarchical Nanoassembly of MoS 2 /Co 9 S 8 /Ni 3 S 2 /Ni as a Highly Efficient Electrocatalyst for Overall Water Splitting in a Wide pH Range

The design of low-cost yet high-efficiency electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) over a wide pH range is highly challenging. We now report a hierarchical co-assembly of interacting MoS2 and Co9S8 nanosheets attached on Ni3S2 nanorod arrays which are supported on nickel foam (NF). This tiered structure endows high performance toward HER and OER over a very broad pH range. By adjusting the molar ratio of the Co:Mo precursors, we have created CoMoNiS-NF-xy composites (x:y means Co:Mo molar ratios ranging from 5:1 to 1:3) with controllable morphology and composition. The three-dimensional composites have an abundance of active sites capable of universal pH…

• NN
  National Natural Science Foundation of China

  Awards: 21771024, U1832152, 21665021, 21871028
• NS
  Natural Science Foundation of Ningxia Province

  Award: NZ17052
• NS
  Natural Science Foundation of Beijing Municipality

  Award: 2182029