The rapid growth of the crystalline silicon (Si) photovoltaic industry has led to a steady increase in the production of waste silicon (wSi) generated during the cutting of Si ingots. Nevertheless, intrinsic oxidation and trace impurities in wSi make it difficult to retain or enhance its value for further use. Herein, we proposed a value-added recycling strategy to flash convert wSi into high performance amorphous Si nanowires (a-SiNWs). This method fully leverages the intrinsic oxidation properties of wSi and utilizes a high temperature gradient thermal field generated by carbon thermal shock to drive the directional diffusion of Si atoms within an oxide-limited domain environment. Copper nanoparticles are introduced to modulate the surface energy of Si atoms, inducing the formation of a-SiNWs. The a-SiNWs grow in situ on a carbon substrate, forming a self-supporting electrode material (identified as a-SiNWs@CC). The prepared a-SiNWs@CC is directly used as the anode of lithium-ion batteries, demonstrating excellent initial coulombic efficiency (ICE, 91.35%) and lithium storage capacity (up to 2150 mA h g⁻¹ at 2 A g⁻¹ for more than 250 cycles). The results hold great promise for the high-value utilization of wSi and the development of Si anodes.

Wide‐bandgap (WBG) perovskite solar cells (PSCs), due to their tunable bandgap, can be integrated into tandem cell configurations with narrow‐bandgap solar cells to overcome the shockley‐queisser (SQ) limitation. However, the main obstacles limiting their performance are poor crystallinity and light‐induced halide segregation. To achieve high performance in WBG PSCs, this study reports a dual‐molecule cooperative strategy involving the introduction of 1‐benzyl‐3‐methylimidazolium bromide (BzMIM Br) as an additive and the introduction of 6‐fluoropyrimidine‐2,4‐ diamine (DMFP) as a passivation layer. DMFP self‐induced penetration to the bottom of the perovskite, forming an A‐B‐A structure with BzMIM Br, through utilizing multisite integration with uncoordinated Pb²⁺, constructing internal molecular bridges. Research findings indicate that the A‐B‐A structure with uniform potential distribution can interact with the perovskite in a step‐like manner, suppressing halide segregation, and replenishing the vacancy defects. Results demonstrate power conversion efficiencies (PCEs) of 22.77% and 18.54% for inverted PSCs with effective areas of 0.043 and 1.0 cm², respectively. Unencapsulated devices retain 95% of initial efficiency after 1500 h of continuous illumination under one‐sun equivalent conditions in a nitrogen atmosphere. Additionally, the PCE of the prepared semi‐transparent WBG devices reached 19.60%, while the PCE of the 4‐terminal all‐perovskite tandem device reached 26.18%.

Biochar-based adsorbents synthesized from agricultural wastes have emerged as economical and environmentally sustainable materials for water purification. In this study, coffee shell-derived biochars were synthesized via pyrolysis at 500 and 700 °C, with and without water washing, and comprehensively characterized to evaluate their potential for removing Rhodamine B (RhB) from aqueous solution. Structural and surface analyses indicated that a higher pyrolysis temperature enhanced pore development and aromaticity, whereas water washing effectively removed inorganic ash, thereby exposing additional active sites. Among all samples, water-washed biochar pyrolyzed at 700 °C (WCB700) exhibited the highest surface area (273.6 m²/g) and adsorption capacity (193.5 mg/g). The adsorption kinetics conformed to a pseudo-second-order model, indicating chemisorption, and the equilibrium data fit the Langmuir model, suggesting monolayer coverage. Mechanism analysis highlighted the roles of π–π stacking, hydrogen bonding, electrostatic interaction, and pore filling. Additionally, WCB700 retained more than 85% of its original capacity after five regeneration cycles, demonstrating excellent stability and reusability. This study presents an economical approach to valorizing coffee waste as well as provides mechanistic insights into optimizing biochar surface chemistry for enhanced dye removal. These findings support the application of engineered biochar in scalable and sustainable wastewater treatment technologies.