Constructing a bifunctional catalyst with both high entropy alloy nanoparticles and Janus multi-principal alloy nanoparticles for high-performance overall water splitting

Designing Janus catalysts for renewable energy-relevant bifunctional small molecule activation

“…69,70 Gan and coworkers produced a bifunctional composite catalyst using high-entropy alloy nanoparticles (HEA-NPs) and Janus multiprincipal alloy nanoparticles (JMPA-NPs), which demonstrated noteworthy activity for water electrolysis under similar reaction conditions. 71 This catalyst (HEA/JMPA) exhibits OER and HER catalytic performance with striking stability in 1.0 M KOH solution while supporting accelerated electron movement and optimized adsorption of intermediates on JMPA-NPs. On the other hand, the high entropy effect of HEA-NPs aids the reaction dynamics resulting in enhanced catalysis.…”

Recent advances and strategies of electrocatalysts for large current density industrial hydrogen evolution reaction

“…The requirements for the electrocatalysts and water-splitting systems are summarized. The critical differences between high current density (>200 mA cm −2 ) and low current density (<10 mA cm −2 ) are demonstrated and briefly 71 Ultrafine alloy nanoparticles Alkaline 850 mV/1000 mA cm −2 Up to 10 000 cycles IrMoP/MNC 74 Atomic cluster, doping Alkaline 340 mV/1000 mA cm −2 27 h at 100 mA cm −2 Fe 2 P-Co 2 P/CF 100 Self-supporting Alkaline 254 mV@1000 mA cm −2 300 h Ni 2(1−x) Mo 2x P 101 Self-supporting Alkaline 294 mV@1000 mA cm −2 70 h MoO 3−x @CoP/NF 102 Self-supporting Alkaline 100 mV@1000 mA cm −2 N/A Hierarchical structure Neutral 400 mV@1000 mA cm −2 3000 CV cycles, 10 h Acidic 135 mV@1000 mA cm −2 3000 CV cycles, 10 h P 3 -MNS 3 /NF 13 Mo and P modification Acidic 243 mV@1000 mA cm −2 Stable at 500 mA cm −2 for 12 h Neutral 360 mV@500 mA cm −2 Stable at 500 mA cm −2 for 12 h Alkaline 245 mV@1000 mA cm −2 N/A Co 2 P/Ni 2 P 104 Self-supported porous structure Acidic 200 mV@1000 mA cm −2 1000 cycles of CP at 50 mA cm −2 Neutral 200 mV@177 mA cm −2 Same as above Alkaline 200 mV@1700 mA cm −2 Same as above F-Co 2 P/Fe 2 P/IF 110 Fluorine doping Alkaline 304.4 mV@3000 mA cm −2 >10 h A-NiCo LDH/NF 111 B-Doping induced amorphization Alkaline 381 mV@1000 mA cm −2 >72 h CoC 2 O@MXene 112 Surface reconfiguration Alkaline 216 mV@1000 mA cm −2 >100 h HEA/JMPA 113 High-entropy alloy Alkaline 1.9 V@305 mA cm −2 28 h explained. It is noteworthy that catalysts that operate well at low current densities do not necessarily maintain their activity and stability when challenged by orders of magnitude larger current densities.…”

“…6E). 113 Compared with AgPdCuAu and AgPdCuAu/NiFeCoAu, HEA/JMPA exhibits better HER catalytic performance, which is closest to that of Pt/C (Fig. 6F and G).…”

Quad-metallic MOF-derived carbon-armored pseudo-high entropy alloys as a bifunctional electrocatalyst for alkaline water electrolysis at high current densities

“…4c), the peaks observed at 778.1 and 793.6 eV are contributed by Co 2p 3/2 and Co 2p 1/2 of Co(0), respectively, and the peaks at 781.4 and 796.9 eV can be attributed to Co 2p 3/2 and Co 2p 1/2 of Co( ii ), respectively. 40 The HR-XPS spectrum of Ni 2p (Fig. 4d) exhibits binding energy peaks of Ni 2p 3/2 and Ni 2p 1/2 of Ni(0) at 852.9 and 866.6 eV, respectively.…”