A Glass‐Ceramic with Accelerated Surface Reconstruction toward the Efficient Oxygen Evolution Reaction

Abstract

The effective non‐precious metal catalysts toward the oxygen evolution reaction (OER) are highly desirable for electrochemical water splitting. Herein, we prepare a novel glass‐ceramic (Ni1.5Sn@triMPO4) by embedding crystalline Ni1.5Sn nanoparticles into amorphous trimetallic phosphate (triMPO4) matrix. This unique crystalline‐amorphous nanostructure synergistically accelerates the surface reconstruction to active Ni(Fe)OOH, due to the low vacancy formation energy of Sn in glass‐ceramic and high adsorption energy of PO43− at the VO sites. Compared to the control samples, this dual‐phase glass‐ceramic exhibits a remarkably lowered overpotential and boosted OER kinetics after surface reconstruction, rivaling most of state‐of‐the‐art electrocatalysts. The residual PO43− and intrinsic VO sites induce redistribution of electron states, thus optimizing the adsorption of OH* and OOH* intermediates on metal oxyhydroxides and promoting the OER activity.

Electrocatalytic upcycling of polyethylene terephthalate to commodity chemicals and H2 fuel

“…36). This structural evolution might account for the catalyst activation process and the advantageous performance of CoNi 0.25 P compared with the crystalline CoNi 0.25 OOH for EG oxidation 39 .…”

“…29a, b), suggesting a possible catalyst activation process. This might be a result of catalyst surface reconstruction, which has been identified in many electrocatalysts (especially for OER) 39,47,48 and photocatalysts 49,50 . For better understanding of the reconstruction of the catalyst, a carbon cloth-supported CoNi 0.25 P catalyst was prepared (Supplementary Fig.…”

“…17 and 18a). This may be attributed to that the phosphorization can accelerate the reconstruction of materials toward active catalyst 39 , and lower the charge transfer resistance (Supplementary Fig. 18b).…”

Green Preparation of CNTs/Graphite Supported NiFe Carbonate Hydroxides for Oxygen Evolution Reaction

“…Also, the divided peak positions in high‐resolution Ni 2p 3/2 and Fe 2p 3/2 (Figure S7c–d) spectra of NiFe CHs‐CNT/G after long‐term OER test all shift toward lower energy, indicating a decreased valence state with the pristine ones [30] . The low‐valent Ni is easily oxidized to the high‐valent state, which can enhance the OER activity of catalysts [31] . The above results suggest that the NiFe CHs‐CNT/G have been converted to their corresponding metal oxy‐hydroxide during the OER process.…”

Triple captured iron by defect abundant NiO for efficient water oxidation

“…The synthesis procedure is according to the reported literature with minor modification. 36 In detail, 0.35 g of Ni(NO 3 ) 2 •6H 2 O and 0.37 g of (NH 4 ) 6 Mo 7 O 24 •4H 2 O were added to 30 mL of deionized water and stirred for 10 min. Then the uniform transparent green solution was poured into a 50 mL Teflon-lined autoclave with a piece of cleaned MoNi foam in it.…”