Effective Surface Area Tuning of Noble Metal-Free CuBO₂/rGO Nanohybrid for Efficient Hydrogen Production with “On–Off” Switching

Abstract

Noble metal-free CuBO 2 /rGO nanohybrid is synthesized and examined as a catalyst for NaBH 4 hydrolysis. Detailed characterization reveals that the hybridization generates a charge imbalance between CuBO 2 and rGO and creates an electron transport channel which facilitates H 2 generation during NaBH 4 hydrolysis. High surface roughness, consequently with high effective surface area, is obtained by varying the synthesis conditions. The high activity (specific rate activity, 2500 mL min −1 g −1 ) and low activation energy (49.8 kJ mol −1 ) establish this noble metal-free catalyst as a potential candidate in the field of fuel cell based hydrogen economy. The mechanistic investigation confirms that protonation and deprotonation can control the H 2 generation kinetics and the same is validated by changing the pH of the reaction medium for an on-site and on-demand H 2 production with easy "on− off" switching.

“Rinse, Repeat”: An Efficient and Reusable SERS and Catalytic Platform Fabricated by Controlled Deposition of Silver Nanoparticles on Cellulose Paper

“…Pristine metallic nanostructures demonstrate excellent catalytic activity toward 4-NP reduction; however they undergo irreversible agglomeration in solution during the reaction process, leading to a gradual loss in activity over time. , To mitigate this issue, an important strategy is to decorate the active catalysts on suitable supports such as polymers, graphene, − CNTs, − etc. This leads to a significant improvement in the stability while retaining the activity throughout the process.…”

“On–off” switch for H2 and O2 generation from HCOOH resp. H2O2

“…Then, the H 2 generation was reactivated by adding an H 2 SO 4 solution by reason of FA reconstruction. However, there is a gradual decline in the H 2 generation rate after each “on–off” switch due to the dilution of the solution 77–79 …”

Efficient and controlled H2 release from sodium formate

“…A gradual decline in the H 2 release rate was detected after each "on-off" control due to SF dilution upon additions of alkali and acid solutions. [57][58][59] Conclusions A simple and surfactant-free method was developed for the synthesis of the bimetallic nanomaterial M 16 Pd 1 /C via simply alloying commercial Pd/C with transition metals. High catalytic activity for direct H 2 production by sodium formate decomposition in the presence of a weak acid allows the presence of both formate and formic acid in the medium.…”

“…A gradual decline in the H 2 release rate was detected after each “on–off” control due to SF dilution upon additions of alkali and acid solutions. 57–59…”