Di-defects synergy boost electrocatalysis hydrogen evolution over two-dimensional heterojunctions

Recent Advances in Defect-Engineered Transition Metal Dichalcogenides for Enhanced Electrocatalytic Hydrogen Evolution: Perfecting Imperfections

“…Single atom S-vacancies can also be induced in hydrothermally synthesized WS 2 nanosheets by H 2 O 2 etching, 65 similar to the case of MoS 2 discussed in section 3.2 . Furthermore, the WS 2 nanosheets with S-vacancies were anchored to the surface of defective graphene to further enhance its HER activity, where the heterostructured catalyst needed a small overpotential of 108 mV to reach 10 mA/cm 2 with a Tafel slope of 48 mV/dec The ECSA of the heterostructure was almost three times than that of pristine WS 2 and the R ct was 61% lower.…”

Spatial Relation Controllable Di‐Defects Synergy Boosts Electrocatalytic Hydrogen Evolution Reaction over VSe2 Nanoflakes in All pH Electrolytes

“…Specifically, single Se vacancies and 2,3 Se vacancies (Poly‐Se vacancy) are marked by green circles and squares, respectively. H 2 O 2 corrosion to obtain single S vacancy defects has been successfully applied to transition metal disulfide, such as MoS 2 [ 46 ] and WS 2 , [ 5 ] but was first applied to MSe 2 . Figure 2d exhibits two suite defects at the atomic scale, highlighted by the blue and green dotted areas, in line with expectations.…”

“…[2] As a water electrolysis benchmark, precious metal electrocatalyst (Pt) possesses excellent activity overall pH values toward HER, but difficulty in industrialization for its scarcity and high cost. [3][4][5] To date, many nonprecious metal-based HER catalysts with high performance in certain electrolytes have been reported, including transition metal sulfides, [6] selenides, [7][8][9][10][11][12][13][14][15][16][17][18] carbides, [19,20] phosphides, [21,22] and thiopho sphates. [23] However, most developed catalysts deliver attractive HER performance only under acidic conditions, limiting their practical applications.…”

Synergizing the internal electric field and ferroelectric polarization of the BiFeO3/ZnIn2S4 Z-scheme heterojunction for photocatalytic overall water splitting

“…In parallel, surface features of catalysts including functional group, 21 atomic defects, 22,23 and junctions 24–27 have a great impact on charge migration and utilization. Considering the fact that the band of BiFeO 3 straddles the water redox energy only, loading noble-metal-based water redox cocatalysts just enhanced oxygen evolution activity, difficult to finish the overall water splitting.…”