Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

Abstract

The overall water splitting for hydrogen production is an effective strategy to resolve the environmental and energy crisis. Here, we report a facile approach to synthesize the Ir-based multimetallic, hierarchical, double-coreshelled architecture (HCSA) assisted by oil bath reaction for boosting overall water splitting in acidic environment. The IrNiCu HCSA shows superior electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are comparable to commercial Pt/C and better than IrO 2. The IrNiCu HCSA exhibits remarkably catalytic efficiency as bifunctional catalyst for overall water splitting where a low cell voltage of 1.53 V is enough to drive a current density of 10 mA cm −2 and maintains stable for at least 20 h. The presented work for the design and synthesis of novel Ir-based multimetallic architecture paves the way for highperformance overall water splitting catalysis.

Dislocation‐Strained IrNi Alloy Nanoparticles Driven by Thermal Shock for the Hydrogen Evolution Reaction

“…The IrNi NA was synthesized by an oil bath reaction in our previous work. [ 11 ] The commercial 20 wt% Pt/C catalyst and IrNi NA were dispersed in ethanol with 40 min sonication to obtain a homogeneous ink, then loaded on the CNTS and dried in a 60 °C constant temperature drying oven. Details of the mass loading of noble metals is provided in the Supporting Information.…”

“…Moreover, dislocations could result in strain effect in another lattice plane that does not contain dislocations at the same area, as shown in the white square in Figure 2d–g. Nevertheless, the IrNi nanoarchitectures (IrNi NA) synthesized by oil bath reaction [ 11 ] which is a much more moderate process, exhibit few dislocations and strain effects, as revealed in Figure S4, Supporting Information, due to the reason that the moderate condition provides enough time for dislocations to move to the edge of nanoarchitectures and disappear at last. Besides, HRTEM images and corresponding dislocation distributions of single Ir/Ni@CNTS are shown in Figures S5 and S6, Supporting Information.…”

Electrochemical conversion of CO2 to syngas with a wide range of CO/H2 ratio over Ni/Fe binary single-atom catalysts

“…Owing to the abundance, low cost and nontoxicity, CO2 and water can be regarded as ideal chemical feedstock for the synthesis of syngas [6][7][8]. Given the combination of CO2 reduction and water splitting, the electrochemical reduction of CO2 and H2O can convert them to syngas and value-added chemical feedstocks by utilizing off-peak electricity or intermittent renewable energy sources, signifying a green way for energy storage and carbon recycling [9][10][11][12][13]. Moreover, the electrochemical reduction of CO2 for syngas synthesis is performed under ambient reaction conditions [14][15][16][17].…”

超细PtCu纳米线的表面结构调控及其增强的醇类 电催化氧化作用

“…A large variety of energy-related electrocatalytic systems have attracted widespread attention [1][2][3], such as electrochemical alcohol oxidation reactions (EAOR), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Platinum is one of the most effective monometallic electrocatalysts in acidic media due to its superior catalytic nature [18].…”