Ultrafine Iridium Nanoparticles Anchored on Co-Based Metal–Organic Framework Nanosheets for Robust Hydrogen Evolution in Alkaline Media

Abstract

A highly promising electrocatalyst has been designed and prepared for the hydrogen evolution reaction (HER). This involves incorporating well-dispersed Ir nanoparticles into a cobalt-based metal–organic framework known as Co-BPDC [Co(bpdc)(H2O)2, BPDC: 4,4′-biphenyldicarboxylic acid]. Ir@Co-BPDC demonstrates exceptional HER activity in alkaline media, surpassing both commercial Pt/C and recent noble-metal catalysts. Theoretical results indicate that electron redistribution, induced by interfacial bonds, optimizes the adsorption energy of water and hydrogen, thereby enhancing our understanding of the superior properties of Ir@Co-BPDC for HER.

Electronic modulation by interfacial bridging between Ir nanoparticle and metal–organic framework to enhance hydrogen evolution

“…S4,† the O 1s spectra of Ir@Co-MOF are meticulously analyzed, showcasing three distinct peaks at energy levels of 531.2, 531.7, and 532.9 eV. 25 These peaks are respectively indicative of Co–O, O–CO, and adsorbed H 2 O species. Additionally, a notable peak at 530.7 eV in the Ir@Co-MOF spectrum is observed, signifying the formation of interfacial Ir–O–Co bonds.…”

“…Relative to Pt, Pd and Ru, Ir exhibits superior catalytic performance in HER due to its distinctive chemical and physical attributes, even when used in very small amounts. 25–27 Ir exhibits higher corrosion resistance and chemical stability, making it particularly suitable for alkaline environments. 28–30 These characteristics make iridium an ideal candidate for enhancing HER efficiency while reducing the overall cost and quantity of catalyst used.…”

Hollow and Ultrathin Mo-Doped CoP Bamboo-Leaf Nanoarrays for pH-Universal Hydrogen Evolution

“…The peaks at 781.1 and 783.1 eV and the satellite peak at 786.6 eV are attributed to the spin–orbit splitting positions of Co 2p 3/2 . And the peaks at 797.0 and 798.4 eV with one shakeup satellite peak at 803.0 eV can stem from the spin–orbit splitting values of Co 2p 1/2 . − After doping the Mo element, Mo possesses less electronegativity than Co. The electron will metastasize from Mo to Co and produce undersaturated Co.…”

High-density accessible Ru–Se–Ni moieties boost the hydrogen evolution reaction by optimizing H absorption

“…It is recognized that noble metals display high activity in the HER, indicating that combining noble metals with selenides could potentially enhance the performance. 22,23 Ruthenium (Ru), belonging to the platinum group metals, shows a similar affinity for hydrogen (approximately 65 kcal mol −1 ) compared to Pt (around 62 kcal mol −1 ), but at a substantially lower cost, roughly just 1/30th of that of Pt. 24–26 Apart from its cost-effectiveness, the real strength of Ru lies in its capability to alter the electronic structure of the catalyst.…”