Seeking highly efficient non-preference electrocatalytic materials that serve photoelectrochemical (PEC) water splitting in acidic systems is expectant in the context of environmentally friendly production. We designed Ni 2 P electrocatalysts synthesized in oil phases via the hot-bubbling method with superb stability in air and sulfuric acid solution for PEC, which were found with excellent hydrogen evolution performance. A tunable particle size and highly exposed (001) planes of Ni 2 P nanocrystals were achieved. The designed catalysts achieved a notable promotion in the hydrogen evolution reaction activity compared to that of Ni 2 P synthesized in the water phase. More specifically, the electrode prepared by self-assembled Ni 2 P nanoparticles was found to have decent overpotential of η 10 = 164 mV in darkness and was further decreased to 129 mV with irradiation of visible light. The cyclic stability tests manifested brilliant durability in 0.5 M H 2 SO 4 . Measurement of the transient photocurrent response and PEC water splitting catalytic performance indicated that the Ni 2 P had high carrier concentration upon irradiation, lower carrier recombination probability, and prolonged photo-response lifetime (3.03−3.14 s).
Two types of iron sulfide, i.e., highly crystalline pyrite (FeS2) and greigite (Fe3S4) were synthesized via hot-injection method only by changing the precursor ratios of iron to sulfur (Fe:S) from...
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