Ultrafine metal phosphide nanoparticles in situ encapsulated in porous N,P-codoped nanofibrous carbon coated on carbon paper for effective water splitting

Preparation of Yolk–Shell‐Structured CoxFe1−xP with Enhanced OER Performance

“…According to previously published works, abundant mesopores can serve as ar eservoir for electrolytesand facilitate fast ion transport and related reactions, [27] and the macropores can provide open spacesf or infiltrationo f the electrolyte and facilitatee fficient diffusion of gaseous products (e.g.,O 2 ). [33] This type of hierarchicalp orous structure can provide al arge number of active sites on the surface of the electrocatalysts and channels facilitating mass transfer for the reactions. [25] By using the BJH and the BET methods, the pore volumes of Co 0.63 Fe 0.37 P, Co 0.47 Fe 0.53 Pa nd Co 0.24 Fe 0.76 Pw ere calculated to be 0.139, 0.219,a nd 0.226 cm 3 g À1 ,r espectively.…”

“…Therefore, the surface characteristics of Co 0.47 Fe 0.53 Pw ere investigated by means of N 2 adsorption/desorption isotherms and pore size distribution curves. [33] This type of hierarchicalp orous structure can provide al arge number of active sites on the surface of the electrocatalysts and channels facilitating mass transfer for the reactions. The pore size distribution of Co 0.47 Fe 0.53 Ps hows that the pore size is mainly distributed over aw ide range of 25-200 nm with ap redominant peak at 56 nm, representing the coexistence of mesopores and macropores.…”

Direct Synthesis of Nitrogen, Phosphorus, and Sulfur Tri‐doped Carbon Nanorods as Highly Efficient Oxygen Reduction and Evolution Electrocatalysts

“…Peak deconvolution of C 1s in Figure c displays four components including the sp 2 ‐hybridized graphitic C (284.6 eV), N–sp 2 C (285.9 eV), C=O (286.9 eV), and O‐C=O (288.7 eV) . The high‐resolution N 1s spectrum (Figure d) can be fitted into three peaks situated at 397.8 eV, 400.1 eV, and 403.4 eV, ascribed to pyridinic N, quaternary N, and pyridinic N ‐oxides, respectively . For the P 2p core level spectrum in Figure e, the significant peak situated at 133.7 eV can be attributed to a phosphate‐like structure existing in the carbonaceous skeleton, and another weak shoulder peak located at 135.8 eV corresponds to the P−C bond .…”

Engineering Ternary Pyrite‐Type CoPS Nanosheets with an Ultrathin Porous Structure for Efficient Electrocatalytic Water Splitting

“…Therefore, a two-electrode configuration was constructed by using the CoPS UPNSs as both anode and cathode catalysts in 1 M KOH solution (inset of Figure 5a). The overall water splitting performance of CoPS UPNSs is comparable with the conventional noble metal catalysts such as Pt/C/NF j j RuO 2 /NF (1.55 V @ 10 mA cm À 2 ) [52] and is much better than most other reported bifunctional catalysts for water splitting (for more details, see Table S2, Supporting Information) such as Co 0.9 S 0.58 P 0.42 j j Co 0.9 S 0.58 P 0.42 (1.59 V @ 10 mA cm À 2 ), [14] CoP@NPC j j CoP@NPC (1.67 V @ 10 mA cm À 2 ), [53] NiÀ CoÀ P j j NiÀ CoÀ P (1.62 V @ 10 mA cm À 2 ), [54] and NiSe j j NiSe (1.63 V @ 10 mA cm À 2 ). The overall water splitting performance of CoPS UPNSs is comparable with the conventional noble metal catalysts such as Pt/C/NF j j RuO 2 /NF (1.55 V @ 10 mA cm À 2 ) [52] and is much better than most other reported bifunctional catalysts for water splitting (for more details, see Table S2, Supporting Information) such as Co 0.9 S 0.58 P 0.42 j j Co 0.9 S 0.58 P 0.42 (1.59 V @ 10 mA cm À 2 ), [14] CoP@NPC j j CoP@NPC (1.67 V @ 10 mA cm À 2 ), [53] NiÀ CoÀ P j j NiÀ CoÀ P (1.62 V @ 10 mA cm À 2 ), [54] and NiSe j j NiSe (1.63 V @ 10 mA cm À 2 ).…”

“…As shown in Figure 5a, the polarization curve indicates that CoPS UPNSs catalyst exhibits superior overall water splitting performance with a cell voltage of 1.57 V to achieve the current density of 10 mA cm À 2 . The overall water splitting performance of CoPS UPNSs is comparable with the conventional noble metal catalysts such as Pt/C/NF j j RuO 2 /NF (1.55 V @ 10 mA cm À 2 ) [52] and is much better than most other reported bifunctional catalysts for water splitting (for more details, see Table S2, Supporting Information) such as Co 0.9 S 0.58 P 0.42 j j Co 0.9 S 0.58 P 0.42 (1.59 V @ 10 mA cm À 2 ), [14] CoP@NPC j j CoP@NPC (1.67 V @ 10 mA cm À 2 ), [53] NiÀ CoÀ P j j NiÀ CoÀ P (1.62 V @ 10 mA cm À 2 ), [54] and NiSe j j NiSe (1.63 V @ 10 mA cm À 2 ). [55] Moreover, long-term electrolysis also proves that the CoPS UPNSs j j CoPS UPNSs cell maintains superior stability over 24 h (Figure 5b).…”