Cathodic corrosion as a facile and universal method for the preparation of supported metal single atoms

Atomically dispersed platinum supported onto nanoneedle-shaped protonated polyaniline for efficient hydrogen production in acidic water electrolysis

“…To evaluate the intrinsic activities of the Pt 1 -NPCNF and Pt 1 -FPCNF catalysts, we further investigated their specific activities through normalizing the current densities by their electrochemically active surface areas (ECSAs). In accord with previous studies about single-atom Pt catalysts [18,19,48,49], the ECSAs of the Pt 1 -NPCNF and Pt 1 -FPCNF catalysts were calculated based on their electrical double layer capacitors, which were obtained from cyclic voltammetry plots in a narrow non-Faradaic potential window (Figs S10 and S11). As shown in Fig.…”

Defect‐Induced Electron Redistribution between Pt‐N3S1 Single Atomic Sites and Pt Clusters for Synergistic Electrocatalytic Hydrogen Production with Ultra‐High Mass Activity

“…X-ray absorption near edge structure (XANES) of Pt L-edge shows that the white line peak of Pt SAs-Pt NCs/NSC catalyst is between Pt foil and PtO 2 , indicating that the valence state of Pt in Pt SAs-Pt NCs/NSC catalyst is between 0 and +4 (Figure 2b), and the valence state of Pt atoms is further determined to be 1.36 by oxidation state fitting (Figure 2d). From the Fourier transform (FT) k 3 -weighted extended X-ray absorption fine structure spectrum (EXAFS) of Pt SAs-Pt NCs/NSC catalyst (Figure 2c,e), there is a main peak at 1.5 Å, belonging to Pt-N/S coordination, [35,36] and a low peak at 2.5 Å, belonging to metallic Pt-Pt coordination, , d) LSV curves before and after durability test for 5000 CV cycles (the inset is i-t curves), e) partial HER performance comparison of the overpotentials at 10 mA•cm −2 and Tafel slopes of Pt SAs-Pt NCs/NSC with recently reported catalysts, [16,28,[37][38][39][40][41][42][43][44][45][46][47][48] and f) partial HER activity comparison of the TOFs of Pt SAs-Pt NCs/NSC with recently reported catalysts. [15,28,44,[49][50][51][52][53][54].…”

电化学溶出法尺寸可控合成铜基氧还原反应催化剂: 从纳米粒子到原子团簇和单原子

“…As for the "bottom-up" synthetic route, represented by the wet-chemistry method, electrodeposition method and atomic layer deposition method, the key is to control the loading amount and the aggregation state of metal atoms to obtain metallic SAs, ACs and NPs [31][32][33]. While the "top-down" synthetic route, downsizing large metal particle precursors to desirable sizes, is superior for the simple synthetic process, efficient controllability and high suitability for large production [34][35][36]. Acid leaching is reported as an efficient top-down method to obtain transitional metal SAs supported on carbonaceous materials by eliminating large particles.…”