Nitrogen‐doped Graphene Chainmail Wrapped IrCo Alloy Particles on Nitrogen‐doped Graphene Nanosheet for Highly Active and Stable Full Water Splitting

Abstract

Electrocatalysts have been used to split water into hydrogen and oxygen for their advantages in clean energy technologies. To reduce cost and enhance stability of electrocatalysts, intensive works have been done in recent decades. Although research on noble‐metal free electrocatalysts has achieved great progress, their full water splitting performance is still incomparable to that of noble metal based catalysts. For this reason, reducing content of noble metal in catalysts is a more practical way. In this work, we report our recent progress on developing bifunctional electrocatalyst based on nitrogen‐doped graphene chainmail wrapped IrCo alloy particles on nitrogen‐doped graphene (NG@IrCo/NG). Benefited from strong interaction among iridium, cobalt and nitrogen‐doped graphene, impressively high electrocatalytic activity of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in both acid and alkaline solutions, which are comparable to commercially used Pt/C and IrO2 electrocatalysts respectively, is found. Catalyst with the structure of nitrogen doped chainmail wrapping on metal core is found to have highly stable full water splitting performance.

Carbon‐Shielded Single‐Atom Alloy Material Family for Multi‐Functional Electrocatalysis

“…Apart from that, the characters of the metal NPs are another critical factor that can indirectly impact the surface electronic properties of the carbon sheath, which may therefore potentially stimulate the expected catalytic activity for targeted reactions. [ 7 ] By far, the modification of the metal core is mainly achieved by constructing metal alloys (e.g., FeCo, [ 3a ] NiFe, [ 8 ] CoNi, [ 3b ] and IrCo [ 9 ] ) or compounds (e.g., CoMnO [ 6 ] ). Due to the unstable secondary metal species, such electrocatalysts normally show excessively stronger binding affinities and electronic interactions with reactants or intermediates during electrocatalysis compared with their single‐metal counterparts.…”

Photothermal‐Driven High‐Performance Selective Hydrogenation System Enabled by Delicately Designed IrCo Nanocages

“…The Co 2p spectrum also exhibits two main peaks and two shakeup satellite peaks, corresponding to Co 2p 3/2 and Co 2p 1/2 orbital levels, respectively. Interestingly, compared with the peaks of bare Ir and Co metals in previous study, [ 43 ] the peaks of Ir and Co in IrCo alloys individually shift to lower and higher energy, indicating that a portion of electrons of Co were transferred to Ir. Obviously, the polarized surface aids in the polar hydrogen transfer from AB to 4‐NS, which is considered as the main factor for the enhanced catalytic performance of the IrCo alloys.…”

Impact of Atomic Rearrangement and Single Atom Stabilization on MoSe2@NiCo2Se4 Heterostructure Catalyst for Efficient Overall Water Splitting

“…Polarization curve of the full cell electrolyzer shows that it requires 1.51 V (not iR corrected) to produce OER current density of 10 mA cm −2 (inset of Figure 4d), which is the lowest value among other benchmark heterostructure catalysts (Figure 4e). [51][52][53][54][55][56][57][58][59][60][61] Furthermore, this combination of electrodes shows an outstanding stability with negligible variation in current density for a continuous operation of 24 h (Figure 4d). To see the practical implication feasibility, full cell electrolyzer of MoSe 2 @NiCo 2 Se 4 and Ir-MoSe 2 @NiCo 2 Se 4 was operated with commercial solar cell (Figure 4f).…”