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The conveniently recoverable photocatalyst with self-floating and photothermal performance has attracted considerable attention. Herein, AgI/UiO-66-NH 2 was anchored on carbonized wood (CW) via a facile solvothermal and ion exchange deposition process. The catalytic properties and performance of the fabricated heterojunction were systematically characterized. The high-resolution transmission electron microscopy confirmed AgI/UiO-66-NH 2 was anchored on CW surface. The X-ray photoelectron spectroscopy revealed the shift of Zr 3d and Ag 3d, proving the heterojunction formation of samples. The heterojunction exhibited the strong UV adsorption peaks between 400 and 800 nm. The infrared photothermal analysis showed the heterojunction (41.2 °C) can adsorb more heat than AgI/UiO-66-NH 2 (31.2 °C) within 15 min visible light irradiation. As the floating carrier, CW enhanced the adsorption and utilization of sunlight. More than 96% of Rh B were degraded within 150 min with irradiation when the heterojunction was applied, and above 85% degradation rate were preserved after 6 cycling recycles, confirming its outstanding stability. Conclusively, this study paved a new pathway for fabricating the potential of easy recyclability and high stability of AgI/UiO-66-NH 2 @CW from biomass for wastewater treatment. [Display omitted] • AgI/UiO-66-NH 2 @CW was synthesized via a facile two-step procedure. • Carbonized wood solved the aggregating disadvantages of powder catalyst. • AgI/UiO-66-NH 2 @CW has good photocatalytic performance and recyclability. • The active species during the degradation process were identified as h+ and ∙O 2 −. [ABSTRACT FROM AUTHOR]

• Copper nanoparticles (Cu NPs) were grown in nitrogen-doped carbonized wood (NCW). • Cu 1.0 NPs@NCW-1000 exhibited high specific capacitance of 10.39 F cm−2. • SSC delivered 0.59 mWh cm−2 with a retention of 92.02 % after 5000 cycles. • Cu 1.0 NPs@NCW-1000 showed a overpotential of 100.43 mV at 10 mA cm−2. • Cu 1.0 NPs@NCW-1000 exhibited a Tafel slope of 95 mV dec−1. The development of self-supporting electrodes using natural wood is promising for energy storage and conversion but still challenging. Here, the nitrogen-doped carbonized wood electrode decorated with copper nanoparticles is synthesized to escalate its capacitive performance and HER. Cu 1.0 NPs@NCW-1000 exhibits a high specific capacitance of 10.39 F cm−2 at 1 mA cm−2. The symmetric supercapacitor achieves an energy density of 0.59 mWh cm−2 at 3.5 mW cm−2 while achieving a capacitance retention of 89.51 % after 8,000 cycles. Cu 1.0 NPs@NCW-1000 also displays good HER activity, comprising an overpotential of 100.43 mV at 10 mA cm−2 and a Tafel slope of 95 mV dec−1. Its outstanding properties were attributed to doping-nitrogen, high specific surface area, hierarchical porous structure, and the interaction between Cu NPs and NCW, which increased active sites and accelerated charge transfer. This work provides a new strategy for the preparation of self-supported carbon electrodes for the energy storage and electrocatalysis applications. [ABSTRACT FROM AUTHOR]

Ru 1 Co 10 /CW-2 exhibits good intrinsic activity and stability for the hydrogen evolution reaction (HER), which can be attributed to tunable lattice tensile strain and electronic interactions, while the porous carbonized wood facilitates rapid electron transfer, electrolyte transport and gas escape. [Display omitted] • Ru doping regulates the lattice tensile strain in Ru-Co bimetallic nanoparticles. • Porous structure favors electron transfer, electrolyte transport and gas escape. • Ru-Co bimetallic nanoparticles decorated on carbonized wood exhibits good HER. • The best alkaline HER overpotential was −42 mV at −10 mA/cm−2. The development of high-performance catalysts for hydrogen production originating from water electrolysis at the cathode is very crucial, but still a challenge. Here, trace Ru-doped Co bimetallic nanoparticles (named Ru x Co y /CW-z, x/y and z represent the molar ratio and total molar content of metals) were in situ decorated on carbonized wood by the vacuum impregnation and high-temperature annealing method. Ru 1 Co 10 /CW-2 demonstrates good hydrogen evolution reaction (HER) intrinsic activity with the overpotential of −42 mV (at −10 mA/cm−2) and Tafel slope of 75 mV dec−1 in a 1.0 M KOH, indicating its favorable HER reaction kinetics, and Ru 1 Co 10 /CW-2 exhibits good stability for 100 h (at −50 mA/cm−2). The good performances of Ru 1 Co 10 /CW-2 can be ascribed to the adjustable lattice tensile strain and electronic interactions, while the porous carbonized wood promotes electron transfer, electrolyte transport and gas escape. This work combines the advantages of lattice tensile strain with self-supported porous carbonized wood for HER in alkaline solution, which provides a valuable reference for synthesizing carbonized wood electrode materials with very low Ru content. [ABSTRACT FROM AUTHOR]