Although biochar is widely recognized as a multifunctional material, developing high-performance carbon materials from biochar for both energy and environmental applications remains challenging. In this work, torreya grandis inner-shell, a widespread lignocellulosic biomass waste, was used to synthesize hierarchically porous carbon materials via a designed carbonization/activation approach. The prepared biochar exhibited excellent energy storage performance in 1 M Na₂SO₄ with a large capacitance, high-rate capability, and favorable stability (97% capacitance retention after 5000 cycles). The fabricated carbon materials also exhibited good catalytic activity toward electrosynthesis of hydrogen peroxide from oxygen reduction. The production of H₂O₂ was as high as 61.3 mg L⁻¹h⁻¹ at −0.6 V and pH 3.0, which was used for efficient degradation of organic pollutants (rhodamine B and phenol) in an electro-Fenton system. This work provides an efficient and low-cost approach for the carbonization/activation of waste biomass to obtain the hierarchical porous biochar for clean energy storage and environmental application.

尽管生物炭被广泛认为是一种多功能材料，但是从生物炭中开发高性能碳材料用于能源和环境应用仍然具有挑战性。在这项工作中，torreya grandis内壳（一种广泛的木质纤维素生物质废物）被用于通过设计的碳化/活化方法来合成分层多孔的碳材料。所制备的生物炭在1 M Na ₂ SO _4中表现出优异的储能性能，具有大电容，高倍率能力和良好的稳定性（5000次循环后的电容保留率为97％）。所制造的碳材料还对氧还原产生的过氧化氢的电合成表现出良好的催化活性。H ₂ O _2的产生在-0.6 V和pH 3.0时，其最高值为61.3 mg L ^-1 h ^-1，可用于在电子芬顿系统中有效降解有机污染物（若丹明B和苯酚）。这项工作为废物生物质的碳化/活化提供了一种高效且低成本的方法，以获得用于清洁能源存储和环境应用的分级多孔生物炭。