Optimization of Interfacial Electrons and Compressive-Tensile Strains at Lignin-Derived Carbon-Supported Multiphase Ni/Cu/MoO2 Interfaces for Boosting Large Current-Density HER
Developing efficient pH-universal hydrogen evolution electrocatalysts is critically needed yet challenged by pH-dependent. Here, a lignin-derived carbon-supported Ni/Cu/MoO 2 heterostructure (Ni/Cu/MoO 2 @LC) through multiphase interfaces design is engineered, which displays excellent electrochemical activity, featuring low potentials of −14.4/−201.5 (acidic), −44.5/−615.7 (neutral), and −28.2/−242.3 mV (alkaline) at −10/−1000 mA cm −2 . Theoretical and experimental analysis show that the Ni/Cu/MoO 2 @LC multiphase interfaces produce a synergistic coupling of compressive-tensile strains and interfacial electron transfer effect. This synergistic effect triggers electron redistribution, tailors the electronic configuration through d -band center optimization, and balances intermediate adsorption/desorption energetics. Additionally, lignin-derived carbon self-supported micro-nano-array structure enhances gas-liquid transport and corrosion resistance, allowing Ni/Cu/MoO 2 @LC to operate stably for at least 120 h, at −500 mA cm −2 in various pH solutions. Thus, this study provides a new idea for the design of cost-effective pH-universal HER electrocatalysts and a new approach for applying lignin-derived carbon in electrocatalysis.
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