Shape-controlled synthesis of Pd nanotetrahedrons with Pt-doped surfaces for highly efficient electrocatalytic oxygen reduction and formic acid oxidation

Ultrafine Core@Shell Cu1Au1@Cu1Pd3 Nanodots Synergized with 3D Porous N-Doped Graphene Nanosheets as a High-Performance Multifunctional Electrocatalyst

“…As given in Tables S2 and S3, even compared with the high-level Pd-based electrocatalysts reported in recent years, Cu 1 Au 1 @Cu 1 Pd 3 NDs/NGS-A still possesses the highest overall MOR and EOR electrocatalytic activity in the enhancement factor, ASA, and NM/Pd-MSA. Furthermore, Cu 1 Au 1 @Cu 1 Pd 3 NDs/NGS-A also has a higher forward/backward ( j f / j b ) peak current ratio (1.060/1.079 for the MOR/EOR) than the commercial Pd/C (0.921/0.902), indicating less accumulation and also better poisoning tolerance regarding the carbonaceous intermediates, as well as a more efficient MOR/EOR electro-oxidation. ,, …”

“…Furthermore, Cu 1 Au 1 @Cu 1 Pd 3 NDs/NGS-A also has a higher forward/backward (j f /j b ) peak current ratio (1.060/1.079 for the MOR/EOR) than the commercial Pd/C (0.921/0.902), indicating less accumulation and also better poisoning tolerance regarding the carbonaceous intermediates, as well as a more efficient MOR/EOR electro-oxidation. 8,15,58 In addition, the potential at which the current reaches 10% of the related peak current is set as the onset potential in this work. Figure 4e,h presents that Cu 1 Au 1 @Cu 1 Pd 3 NDs/NGS-A possesses a lower MOR/EOR onset potential (0.581/0.511 V) compared with the commercial Pd/C (0.614/0.534 V), indicating a lower MOR/EOR overpotential.…”

“…For the ORR, compared with the commercial Pd/C, it shows respective 13.8-, 49.4-, and 103.5-fold enhancements in the ASA, NM-MSA, and Pd-MSA. And its ASA and NM-MSA are also 15 Detailed physicochemical characterization, electrochemical analysis, and DFT simulation unveil the synthetic mechanism of the NDs and further reveal the origins of such greatly improved electrocatalytic performance: the prominent structural properties of NGS, the ultrafine and monodispersed size as well as the highly uniform morphology of the NDs-A, the special Cu−Au−Pd alloy nanostructure with an ultrafine Cu 1 Au 1 core and a subnanometer Cu 1 Pd 3 shell, and also the SMSI imparted by both the annealing process and the abundant N dopants in NGS. This work has not only designed and prepared a trifunctional electrocatalyst with exceptional activity and stability/durability toward the alkaline ORR, MOR, and EOR but also developed a facile and universal method for synthesizing NM-based ultrafine-core@ultrathinshell nanomaterials for various energy-conversion or environmental (electro)catalytic reactions.…”

“…Pt is widely accepted as the most effective polycrystalline single metal for catalyzing the ORR; however, the scarce resource and the resulting high price have severely hindered its large-scale application in LTFCs. ,− Fortunately, Pd shows an ORR electrocatalytic activity comparable with that of Pt in alkaline media and also has a much higher abundance in the Earth’s crust, , which make it a promising alternative. Moreover, plenty of studies have demonstrated that Pd is much more active for the electro-oxidation of alcohols than Pt in alkaline media. , Thus, Pd-based nanomaterials have become a very appealing material platform for designing and preparing high-performance electrocatalysts used for alkaline DAFCs.…”

Au-modified PtCu nanodendrites as a highly stable and active electrocatalyst

“…[1][2][3][4][5] Currently, Pt is regarded as the best monometallic catalyst for both anode and cathode reactions (i.e., the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR)). [6][7][8][9][10] However, the low activity and stability of Pt are the two most important problems restricting the successful industrial application of DMFC. In the past several decades, people have applied various techniques to improve the activity of Pt catalysts, such as alloying/de-alloying, [11][12][13][14] tailoring the morphologies of nanomaterials, [15][16][17][18] and replacing new supports.…”